31-samss-004.pdf

Materials System Specification 31-SAMSS-004 Centrifugal Pumps

1 January 2018

Document Responsibility: Pumps, Seals, and Mixers Standards Committee

Contents 1

Scope ................................................................ 2

2

Normative References ....................................... 2

3

Terms and Definitions ....................................... 3

5

Requirements .................................................... 4

6

Basic Design ..................................................... 4

7

Accessories ..................................................... 15

8

Inspection, Testing, and Preparation for Shipment ......................... 23

9

Specific Pump Types ....................................... 28

11 Guarantee and Warranty ................................. 31 Revision Summary.................................................. 32

Previous Issue: 1 January 2017 Next Planned Update: 1 January 2020 Revised paragraphs are indicated in the right margin Contact: Al-Ghamdi, Abdullah Ali (ghamaa3g) on +966-13-8809507 ©Saudi Aramco 2018. All rights reserved.

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Document Responsibility: Pumps, Seals, and Mixers Standards Committee Issue Date: 1 January 2018 Next Planned Update: 1 January 2020

31-SAMSS-004 Centrifugal Pumps

The following paragraph numbers refer to API STD 610, 11th Edition, September 2010 (ISO 13709, 2009), which are part of this specification. The text in each paragraph below is an addition unless it is noted as an exception, modification, or deletion to API STD 610 (ISO 13709). Paragraph numbers not appearing in API STD 610 (ISO 13709) are new paragraphs to be inserted in numerical order. 1

Scope This specification, together with the appropriate centrifugal pump Data Sheet and Purchase Order, covers minimum requirements for API STD 610 (ISO 13709). Centrifugal pumps shall be supplied by Vendors qualified by experience in manufacturing the units proposed. To qualify, the Vendor must have manufactured at the proposed manufacturing location, at least two pumps of comparable speed, flow, head, power rating and discharge pressure for a liquid having comparable characteristics. These pumps must have been in service for at least one year and must be performing satisfactorily.

2

Normative References Materials or equipment supplied to this specification shall also comply with applicable sections of the latest edition (unless an edition is specified) of the references listed below or in the body of this document. 2.1

Saudi Aramco References Saudi Aramco Engineering Procedure SAEP-302

Waiver of a Mandatory Saudi Aramco Engineering Requirement

Saudi Aramco Materials System Specifications 17-SAMSS-515

Auxiliary Electrical Systems for Skid Mounted Equipment

31-SAMSS-012

Shaft Sealing Systems for Centrifugal and Rotary Pumps

32-SAMSS-013

Lubrication, Shaft Sealing, and Control Oil Systems for Special Purpose Applications (As required by paragraphs 9.2.6.2 & 9.2.6.4)

34-SAMSS-625

Vibration, Axial Position, and Bearing Temperature Monitoring System (As required by Section 7.4.2) Page 2 of 32

Document Responsibility: Pumps, Seals, and Mixers Standards Committee Issue Date: 1 January 2018 Next Planned Update: 1 January 2020

34-SAMSS-831

31-SAMSS-004 Centrifugal Pumps

Package Unit Instrumentation (As required by sections 7.4 & 7.4.3.2)

Saudi Aramco Forms and Data Sheets SA-8020-415 & SA-8020-415-M

Thermocouples

SA-8020-416

Resistance Temperature Detectors

Saudi Aramco Inspection Requirements Form 175-310600

Centrifugal Pumps

Form 175-310800

Helico-Axial Multiphase Pumps

Saudi Aramco Standard Drawings

2.2

AD-036821

Material Guide for Horizontal, Vertical In-line and Vertical Suspended Pumps

AA-036859

Lube Oil Circulation System (As required by paragraph 9.2.6.5)

Industry Codes and Standards American Petroleum Institute API STD 610/ ISO 13709

Centrifugal Pumps for Petroleum, Heavy Duty Chemical, and Gas Industry Services

International Organization for Standardization NACE MR0175/ ISO 15156

Petroleum and Natural Gas Industries Materials for Use in H2S-containing Environments in Oil and Gas Production

European Standard EN 10204 3

Metallic Products-Types of Inspection Documents

Terms and Definitions 3.22

(Exception) Maximum discharge pressure is the maximum suction pressure plus the maximum differential pressure that the pump is capable of developing at shut-off when operating with the maximum specified relative density with: 

The maximum impeller diameter at the rated speed for constant speed applications. Page 3 of 32

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

5

31-SAMSS-004 Centrifugal Pumps

The rated impeller diameter at the maximum speed for variable speed applications.

3.51

Agreement shall be between the Standards Committee Chairman; Pumps, Seals, and Mixers and the manufacturer.

3.65

Low-Flow High-Head (LFHH): shall be defined as pumps with flow rate up to 250 GPM and with differential head higher than 800 ft.

Requirements 5.1

The units of drawings and maintenance dimensions of pumps shall be as per the pump datasheet unites in the purchase order.

5.3.1

Any conflicts between this document and other applicable Mandatory Saudi Aramco Engineering Requirements (MSAERs) shall be addressed to the EK&RD Coordinator. Any deviation from the requirements herein shall follow internal company procedure SAEP-302. All deviations from this specification shall be separately listed by the Vendor in his quotation and shall refer to the relevant paragraph numbers.

6

Basic Design 6.1

General

6.1.2

(Clarification) Operating conditions and liquid properties shall be based on datasheets and purchase order specifications.

6.1.4

(Clarification) For Helico-Axial Multiphase pumps, higher head can be achieved by different hydraulics or by changing speed with the variable speed driver.

6.1.8

For all pumps with the exception of Helico-Axial Multiphase pumps, the Vendor shall indicate on the pump performance curve, the NPSH3 curve for 3% reduction of the first stage differential head. For high energy pumps in water injection service, refer to paragraph 6.1.16, the Vendor shall also indicate on the pump performance curve a predicted NPSH3 curve for a 40,000 hour impeller life. This curve shall represent the NPSH required to permit 40,000 hours of operation between the minimum continuous stable capacity and 120% of the rated capacity after which time, the material loss due to cavitation erosion at any location on the impeller shall not exceed 75% of the vane thickness. The Vendor shall guarantee the 40,000 hour Page 4 of 32

Document Responsibility: Pumps, Seals, and Mixers Standards Committee Issue Date: 1 January 2018 Next Planned Update: 1 January 2020

31-SAMSS-004 Centrifugal Pumps

impeller life for the above parameters. For variable speed applications, the Vendor shall also indicate on the pump performance curve the NPSH3 curve for the maximum speed required to meet the process conditions specified in the pump data sheet. Visualization test is required for water injection pumps when the first stage impeller eye peripheral velocity exceeds 47 m/sec (154 ft/sec) to predict the 40,000 hours. The visualization test is not required when the first stage impeller of identical design and material has proven experience with comparable operating parameters and running satisfactory for at least 40,000 hours. This experience shall be sent for the review and approval of the Standards Committee Chairman; Pumps, Seals and Mixers. A cavitation inception curve (NPSH-inception vs Flow rate covering MCSF to 120% of BEP) shall be submitted for all pumps with impeller eye peripheral velocity in excess of 47 m/sec (154 ft/sec). When the first stage impeller eye peripheral velocity is in excess of 70 m/s (230 ft/sec), the pump shall be free of cavitation; as such the NPSHA is required to be above the cavitation inception level across the allowable operating region. The NPSH requirements shall not exceed the specified NPSH available over the range of minimum continuous stable capacity to 120% of the rated capacity. At rated capacity, the NPSHA shall also exceed the NPSH3 by a minimum margin of 1 meter (39 inches). For variable speed pumps, the above NPSH requirements apply for all speeds required to meet the specified operating conditions. NPSH tests are not applicable for Helico-Axial Multiphase pumps. 6.1.9

The suction specific speed for all pumps, except integrally geared pumps, shall not exceed 232 (12,000 in U.S. units). Higher values maybe accepted with proven experience for at least 3 years on operation at similar operating conditions such as NPSH margins and percentage of operating point to BEP. Acceptance of higher values requires the review and concurrence of the Standards Committee Chairman; Pumps, Seals, and Mixers.

6.1.11

(Exception) The guaranteed pump performance curve, as quoted, shall be continuously rising to shut-off. The head rise shall be a minimum of 10% of the head at rated capacity unless accepted by the Standards Committee Chairman; Pumps, Seals and Mixers. The use of a discharge orifice requires the approval of Standards Committee Chairman; Pumps, Seals, and Mixers.

6.1.12

The capacity at the end of the curve shall not be less than 120% of the rated capacity (110% for integrally geared pumps). The normal point shall be between 80% and 100% of the pump best efficiency point unless accepted Page 5 of 32

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31-SAMSS-004 Centrifugal Pumps

by the Standards Committee Chairman; Pumps, Seals, and Mixers. The minimum continuous stable capacity shall not exceed 50% of the rated capacity for all pumps with the exception of the below two cases: i.

Water injection pumps with rated driver power above 7,457 KW (10,000 HP).

ii.

Vertical seawater intake pumps discharging to unpressurised system such as water channels.

For the above two pump cases, the minimum continuous stable capacity shall not exceed 65% of the rated capacity 6.1.14

Control of the sound pressure level to meet the specified requirements shall be the responsibility of the Vendor and Purchaser.

6.1.15

(Exception) For all pumps excluding Helico-Axial Multiphase pumps, the radial clearance between the diffuser vane or volute tongue (cut water) and the periphery of the rated impeller blade shall be per the below table: Rated Power per Stage

Volute Design Casing

Diffuser Design Casing

≤ 300 HP

6%

3%

>300 HP

8%

4%

Pumps with smaller clearances require the review and concurrence of the Standards Committee Chairman; Pumps, Seals, and Mixers. For such cases, the following shall be submitted for review: 

Vendor reference of at least two identical pump having clearance similar to the proposed clearance and is operating at similar operating conditions.



The referenced pump cut water clearance.



The referenced pump operating conditions and vibration data, including vibration at vane-pass frequency when operating at minimum continuous stable flow and 120% of rated flow.



The user contact information of the referenced pump.

6.1.16

Pumps with head greater than 200 m (650 ft) per stage and absorbing more than 225 kW (300 HP) per stage are considered as high energy pumps.

6.1.17

The Vendor shall indicate on the pump Data Sheet, any cooling requirements, including that of the driver if supplied with the pump.

6.1.20

(Modification) If seawater cooling is to be used, an inlet design temperature of 35°C (95°F) shall be used. Page 6 of 32

Document Responsibility: Pumps, Seals, and Mixers Standards Committee Issue Date: 1 January 2018 Next Planned Update: 1 January 2020

6.1.28

31-SAMSS-004 Centrifugal Pumps

(Modification) Unless otherwise specified, the equipment will be installed outdoors in a desert area, with relative humidity from zero to 100% (condensing) and ambient temperatures from 0°C to 50°C (32°F to 120°F). Metal temperature can reach 70°C (158°F) when exposed to direct solar radiation. The equipment shall be designed to withstand these conditions. Additionally, equipment which is not enclosed or hermetically sealed and is situated offshore or near shore (i.e., within ½ km of the shoreline) shall be protected against failure due to windborne seawater spray and the accumulation of wetted salts.

6.1.29.1

(Modification) The details of threading shall conform to ISO 261, ISO 262, ISO 724, ISO 965, ASME B1.1 or other internationally standardized threading.

6.1.35

The rated speed of vertical suspended pumps shall not exceed 1,800 RPM unless accepted by the Standards Committee Chairman; Pumps, Seals, and Mixers.

6.1.36

The speed, head per stage and power per stage for water injection pumps shall not exceed 4,000 RPM, 457 m (1,500 ft) and 4,477 kW (6,000 HP), respectively unless accepted by Standards Committee Chairman; Pumps, Seals, and Mixers after evaluation of the following minimum requirements: 

Vendor reference of at least two, same or similar pumps and impellers with same materials operating with similar or higher speeds, power and head per stage and having a MTBF of greater than 40,000 hours.



User contact information of the referenced pump.



Also, the manufacturer shall guarantee the pump for at least 40,000 hours of operation against impeller failure.

6.1.37

The efficiency of Low Flow High Head (LFHH) applications shall not be less than 20% at normal and rated points unless accepted by Standards Committee Chairman; Pumps, Seals, and Mixers.

6.1.38

With the exception of pumps listed below, the pump efficiency at rated point shall not be less than the efficiency value (Pɳ) calculated as per the following equation:

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31-SAMSS-004 Centrifugal Pumps

Where: Q: is rated flow in GPM. For double suction impeller use full flow per impeller (not per eye). N: is shaft speed in revolution per minute RPM. Ns: Specific speed (using GPM, feet and RPM). For multistage pumps where the Ns is different for a number of stages, the weighted average of specific speeds of the stages shall be used. The following pumps are exempted from this minimum efficiency requirement: i.

Pumps with rated power of less than 37 kW (50 HP).

ii.

Multiphase pumps.

iii.

Pumps that operate for less than 10% of the time such as fire water pumps and Storm water pumps.

Any deviation of the above requirements require review and concurrence by the Standards Committee Chairman; Pumps, Seals, and Mixers. 6.2

Pump Types (Exception) The following pump configurations are not acceptable unless agreed by the Standards Committee Chairman; Pumps, Seals, and Mixers: a)

Close coupled (impeller mounted on motor shaft), rigidly coupled overhung and rigidly coupled vertical in-line.

b)

Two or more stages, overhung or vertical in-line.

c)

Double suction overhung.

d)

Single volute requiring a driver rated in excess of 112 kW (150 HP).

e)

Horizontal or vertical inline ring-section casing (with axial tie rods) design.

f)

Horizontal single stage overhung having driver nameplate rating exceeding 225 kW (300 HP) or exceeding 600 m3/hr (2,640 gpm).

6.3

Pressure Casings

6.3.1

(Exception) Maximum discharge pressure is as defined by paragraph 3.22.

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31-SAMSS-004 Centrifugal Pumps

6.3.5

(Exception) The MAWP shall be equal to the maximum discharge pressure as defined in paragraph 3.22.

6.4

Nozzle and Pressure Casing Connections

6.4.2

Suction and Discharge Nozzles

6.4.2.3

(Exception) For steel casings, the facings of finished flanges shall be raised face for flange rating Classes, 300 and 600 and ring joint for Classes 900 and higher. Flanges shall conform to ASME B16.5. Flanges above 24 inch NPS shall conform to ASME B16.47. For forged or fabricated casings and nozzle heads, flanges shall be forged welding neck or forged long welding neck, conforming to ASME B16.5 for flanges up to 24 inches and ASME B16.47 for flanges above 24 inches. For seawater water services, flanges above 60 inch NPS shall be deigned per AWWA C207.

6.4.3

Auxiliary Connections

6.4.3.1

Socket weld is not permitted for 2 in and larger connections or for the following services: 1)

High pressure application of nozzle Class 900 and higher

2)

Cryogenic application with service temp less than -18°C.

The piping and fitting materials for the pressure casing connections shall comply with Standard Drawing AD-036821. 6.4.3.8

(Exception) Cylindrical threads are not permitted.

6.4.3.9

The first segment of the pressure casing connection shall be terminated with a flange or an elbow followed immediately by a flange. If butt-weld is used, it shall be subjected to 100% radiographic examination unless accepted by the Standards Committee Chairman; Pumps, Seals, and Mixers. In addition, all welds for pressure casing connections shall be subjected to a fluorescent magnetic particle examination (ferromagnetic material) or a liquid penetrant examination (non-ferromagnetic material). Note:

6.4.3.10

The aim of the above first sentence is to have the flanges on pressure casing connections located very close to the pump casing. This will reduce dead leg length, ensure stiff connection with short gusseting, and simplify pump handling during shipping and overhaul.

Piping less than 2 inches shall be gusseted in two orthogonal planes to increase the rigidity of the piped connection in accordance with the Page 9 of 32

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31-SAMSS-004 Centrifugal Pumps

stipulations. Deviation from this requirement due to space or pump construction limitations requires the review and concurrence of the Standards Committee Chairman; Pumps, Seals, and Mixers. 6.4.3.10b Gusset welded directly to flange web is not acceptable. 6.4.3.10j Integrally geared pumps shall have Schedule 80 for all pipe nipple sizes. 6.4.3.10h Piping shall terminate in a flanged connection. 6.4.3.14

(Modification) Pump casing vent (except self-venting pumps) and drain connections shall be braced and shall be provided with flanged valves.

6.4.3.16

Pumps on water injection and water supply services and having driver power rating of 3,730 kW (5,000 HP) or higher, shall be provided with 1 inch borescope inspection port to allow onsite inspection of the first stage impeller suction(s) without dismantling the pump.

6.6

Rotors

6.6.3

(Modification) Collet mounted impellers are acceptable only in vertically suspended pumps in water service below 70°C (158°F) if the absorbed power per stage does not exceed 75 kW (100 HP). Dimple in the shaft for positive mechanical locking is not allowed.

6.6.15

Horizontal double casing pumps having a driver rated above 3,730 kW (5,000 HP) shall be provided with balancing planes for field trim balancing, both on inboard and outboard ends. The balancing planes shall be provided with a minimum of twelve equally spaced pre-drilled, tapped and plugged holes for the insertion of balance weights. The outboard bearing housing shall be provided with a removable access panel. A coupling hub having balance holes per API STD 671 is acceptable as an inboard balance plane.

6.7

Wear Rings and Running Clearances

6.7.1

(Exception to last sentence) Renewable impeller wear rings are required and may be omitted if any of the following conditions apply: a)

Impellers are of the hydraulically unbalanced semi-open design;

b)

The peripheral velocity of the impeller wear surface exceeds 45 m/s (150 ft/s);

c)

The head per stage exceeds 275 m (900 ft);

d)

Operating temperature or severe transients could result in loosening of the wear ring fit. If impeller wear rings are omitted, the wear surfaces Page 10 of 32

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31-SAMSS-004 Centrifugal Pumps

of closed design impellers shall be overlaid with hard materials. Manufacturer standard materials are acceptable provided that the proposed materials are used in similar service and are operating successfully. Integral impeller wear rings shall be provided for water injection pumps with driver rating of more than 5,970 kW (8,000 HP). Renewable wear ring is acceptable alternative with the approval of the Standards Committee Chairman; Pumps, Seals, and Mixers. The Vendor shall submit the following in his proposal: 

Experience of using renewable wear rings with similar wear ring peripheral velocity and differential head per stage.



Method of locking the impeller wear ring and calculation of the required shrink fit. Also, manufacturer shall guarantee wear rings against looseness for at least 40,000 hours.

Tungsten carbide laser coating shall be applied on the wearing parts for all high energy pumps in water applications. Equivalent coating can be proposed with technical description and proven experience for review and concurrence by the Standards Committee Chairman; Pumps, Seals, and Mixers. 6.7.4 c

Stationary wear part shall be non-metallic type for boiler feed water and for clean light hydrocarbon where the specific gravity is less than 0.7. Use of metallic component requires the review and concurrence of Standards Committee Chairman; Pumps, Seals, and Mixers. Lower clearances may be proposed but shall not be less than 70% of the minimum clearances set in Table 6. Pressure and temperatures limits shown in table H.3 are applicable.

6.8

Mechanical Shaft Seals

6.8.1

(Modification) All mechanical seals shall be in accordance with 31-SAMSS-012.

6.9

Dynamics

6.9.2

Torsional Analysis

6.9.2.10

When either a steady-state, damped-response analysis or a transient torsional analysis is performed, the Vendor shall furnish a detailed report of the analysis. The report shall be submitted to the Standards Committee Chairman; Pumps, Seals, and Mixers for review and approval.

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31-SAMSS-004 Centrifugal Pumps

6.9.3

Vibration

6.9.3.3

The FFT plotted spectra shall be included in the pump test results.

6.9.3.6

(Modifications to Table 8) The location of seismic radial vibration measurements for the non-drive side shall be on the same radial plane as the thrust bearing.

6.10

Bearings and Bearing Housings

6.10.1

Bearings

6.10.1.3

(Modification to last sentence) The Vendor shall ensure that values for temperature rise (6.10.2.4) and vibration (6.9.3.6) meet the requirements of this specification.

6.10.2

Bearing Housings

6.10.2.4

(Exception) Maximum bearing temperatures shall comply with the following requirements: a)

For bearings that are lubricated by any means other than external oil circulation or forced feed lubrication system, the metal temperature shall not exceed 85°C (185°F) in the loaded area, based on a maximum ambient temperature of 50°C (122°F) and taking in consideration solar radiation as indicated in paragraph 6.1.28. If bearing metal temperature monitoring is not practical, the sump oil temperature shall be measured and, during shop testing, the sump oil temperature rise shall not exceed 35°C (63°F);

b)

The metal temperature of bearings lubricated by external oil circulation or forced feed lubrication systems shall not exceed 95°C (203°F) in the loaded area, based on a maximum oil inlet temperature of 60°C (140°F). During shop testing, the differential between the bearing loaded area metal temperature and the actual oil inlet temperature shall not exceed 35°C (63°F).

6.10.2.6

(Modification) High quality bearing seals/isolators meeting IP66 shall be used unless oil mist is used.

6.11

Lubrication

6.11.4

Grease lubrication shall not be used.

6.11.5

Pumps handling process fluid with normal temperature exceeding 260°C (500°F), and do not require external oil system, shall have provisions for Page 12 of 32

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31-SAMSS-004 Centrifugal Pumps

connection to an external oil circulation system. The bearing housings shall include plugged inlet and outlet connections for externally supplied oil. The outlet connection shall be located to maintain proper oil level in the bearing housing if an oil circulating system is used and shall be a minimum of 0.75 inch. 6.12

Materials

6.12.1

General

6.12.1.1

The pump materials shall be as per the specified material code in the pump data sheet. Material grades for the specified material code are listed in Standard Drawing AD-036821. Equivalent materials listed in Table H.2 are acceptable. Equivalent materials complying with other national standards are acceptable provided that their mechanical and chemical properties are equivalent to or exceed those of the specified materials. Equivalent materials are subject to the review and concurrence of the Standards Committee Chairman; Pumps, Seals, and Mixers. Gasket or packing materials containing asbestos are not permitted.

6.12.1.6

(Exception) Pump materials shall be in accordance with 6.12.1.1

6.12.1.8

Material test reports shall be provided in accordance with Inspection Requirement Form 175-310600 Centrifugal Pumps. The applicable inspection form for Helico-Axial Multiphase Pumps is 175-310800. Material Test Reports for pressure containing parts shall be provided in accordance with EN 10204, 3.1; and EN 10204, 2.1 for impellers, shafts, and other wetted components. Parts exposed to sour service must meet NACE MR0175/ISO 15156.

6.12.2

Castings

6.12.2.3.a All weld repairs and post weld heat treatment at foundry and pump Vendor shop shall conform to the original material specification of the casting. All welding procedure specifications, performance qualification records, and weld map documents must be available for the purchaser inspector review upon his request. All welds to duplex and super duplex pressure casing shall have post weld heat treatment. Weld repairs of pressure containing castings, including impellers, shall be considered major if any of the following conditions apply: a)

Castings leak during hydrostatic testing

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31-SAMSS-004 Centrifugal Pumps

b)

The depth of the repair cavity prepared for welding exceeds 20% of the wall thickness or 25 mm (1 in), whichever is smaller

c)

The surface area of the repair cavity exceeds 65 cm² (10 in²).

When the pressure casting has a through hole or or the casting has more than three major defects, the weld repair procedures, including the welding procedure specifications (WPS), with supporting documentation shall be prepared and submitted to the Buyer Representative for review and concurrence prior to any repairs being conducted. If the defect does not fully penetrate the casing but the repair will require making a through hole in the casting; then, this defect shall also be treated as a through hole defect. All major repairs shall be documented. The documentation shall include the following: a)

Extent of the repair

b)

Location

c)

Size

d)

The welding procedure specification

e)

Detailed photographs of the defect: 1)

Prior to any preparatory work

2)

After preparation but prior to the actual repair.

If the location of the defect cannot be clearly defined by photographic means, the location shall be indicated on a sketch or drawing of the affected component. The Purchaser may require additional non-destructive examinations to verify the acceptability of the repair. Such additional requirements shall then be subject to mutual agreement between the Purchaser and the Vendor. 6.12.2.3.b (Exception) Repair by plugging is not permitted. 6.12.2.5

When required by paragraph 6.12.2.3.a, the repair procedures and associated documentations shall be submitted to the Standards Committee Chairman; Pumps, Seals, and Mixers for review and approval before proceeding with the repair

6.12.2.7

A radiographic examination shall be conducted on cast impellers if the peripheral velocity at rated speed is 75 m/s (250 ft/s) or higher. Page 14 of 32

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31-SAMSS-004 Centrifugal Pumps

Radiographs shall be made after machining and shall cover impeller shrouds over the outer 75 mm (3 in) of the radius. Radiographs shall also be taken through the impeller, thus showing the intersection of the vanes and shrouds. Impellers shall be subjected to a fluorescent magnetic particle examination (ferromagnetic material) or a liquid penetrant examination (non-ferromagnetic material) if the peripheral velocity of the impeller at rated speed is 45 m/s (150 ft/s) or higher. All visible surfaces of the finished impeller (prior to wear ring installation) shall be examined and shall be in agreement with the criteria set forth in the ASME SEC VIII D1, Appendices 6 and 8. 6.12.3

Welding

6.12.3.1

(Modification to second sentence) Other Equivalent international welding standards are acceptable.

6.12.3.4.e Magnetic-particle or liquid-penetrant examination is required for auxiliary connection welds. For all pumps, with the exception of vertical seawater intake pumps, 100% radiographic examination is required for the welded areas of the suction and discharge nozzles and any casing welds. For vertical seawater intake pumps, only 10% radiographic examination is required. Radiographic examination may be substituted by ultrasonic examination, if accepted by the Standards Committee Chairman; Pumps, Seals, and Mixers.

7

6.12.4.3

ASME SEC VIII D1 shall apply for impact-testing requirements.

6.13

Nameplates and Rotation Arrows

6.13.2

Pump nameplate data shall also include the Purchase Order number, liquid pumped, lubrication details and shaft lift (for vertical pumps).

Accessories 7.1

Drivers

7.1.4

Electric motors shall comply with 17-SAMSS-502, 17-SAMSS-503 or 17-SAMSS-520, as specified on the motor data sheet. For pumps equipped with variable frequency drive system, the motor power rating shall be 110% of the pump break horse power at the highest speed required to meet the process conditions specified in the pump data sheet.

7.1.9

(Modification to first sentence) Steam turbines shall comply with Page 15 of 32

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31-SAMSS-004 Centrifugal Pumps

32-SAMSS-009 or 32-SAMSS-010, as specified on the turbine data sheet. 7.1.10

(Modification) Gears shall comply with 13-SAMSS-001 or 13-SAMSS-003, as specified on the gear data sheet.

7.1.11

Gas Turbine shall comply with 32-SAMSS-100 and diesel engines shall comply with 30-SAMSS-001.

7.2

Couplings and Guards

7.2.2

Lubricated couplings are not acceptable. Flexible disc pack or diaphragm type couplings shall be supplied for horizontal pumps and vertical in-line pumps. Vertically suspended pumps equipped with thrust bearings shall have flexible disc pack or diaphragm type couplings between the driver or gear and the thrust bearing. When the thrust bearing fitted on the driver, the coupling shall be rigid type. Elastomeric couplings or couplings having a comparable torsional stiffness are required for pumps driven by reciprocating engines. Elastomeric members shall not deteriorate due to exposure to hydrocarbon environment. Rigid adjustable spacer type couplings are required for vertical in-line and vertically suspended pumps not having thrust bearings. Spacer type couplings shall be furnished for all horizontal, flexibly coupled vertical in-line and vertical suspended pumps. Couplings for high speed integrally geared pumps may be of the non-spacer type. Flexible couplings shall be capable of accepting parallel misalignment of not less than 1270 micrometers (50 mils) between shaft ends and shall be capable of absorbing twice the maximum axial growth plus twice the axial magnetic centering force of the electric motor.

7.2.8

All vertical pumps and overhung pumps may have parallel shaft ends. Horizontal between bearings pumps shall have tapered shaft ends with retaining nut threads. Pumps having the smallest diameter of their shaft exceeds 100 mm (4 in) and their shaft speed exceeds 3,600 RPM shall be furnished with couplings having hydraulic fit complying with API STD 671.

7.2.13

Coupling guards shall have provisions to permit inspection of flexible elements. All coupling guards for pumps, with the exception of integrally geared pumps, in hydrocarbon service shall be of a non-sparking material such as aluminum or brass. If totally enclosed coupling guard is provided, drain connection shall be provided for the coupling guard.

7.3

Baseplates

7.3.9

For pumps having a driver rating of 750 kW (1,000 HP) or above, baseplates Page 16 of 32

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31-SAMSS-004 Centrifugal Pumps

shall be constructed with full depth cross members under all machinery feet. Welding procedures and welders shall be qualified per AWS D1.1 or equivalent. 7.3.10

Baseplates shall be fully covered by a smooth deck plate or checkered steel plate. All walking surfaces shall be coated with non-slip paint. All baseplates, excluding sub-bases, for permanent installation in onshore facilities shall be grouted. The grout holes must be accessible for grouting with the pump and driver mounted.

7.3.13

For offshore installations, the baseplate and pedestal support assembly shall be sufficiently rigid to be mounted without grouting.

7.3.17

(Exception to equipment weights) Baseplate pedestals and mounting pads shall be provided with horizontal and vertical alignment jackscrews with removable jack plates if the pump or driver mass exceeds 100 kg (225 lbs).

7.3.20

The Vendor shall be responsible for the proper design of the baseplate and for the elimination of any unacceptable characteristics such as harmonic vibration.

7.4

Instrumentation Instrumentation shall be in accordance with 34-SAMSS-831.

7.4.2

Vibration, Position, and Temperature Detectors

7.4.2.2

Vibration detectors shall be provided as follows: 1.

One seismic vibration transducer reading velocity on each bearing housing in radial direction for: a)

Pumps equipped with anti-friction radial bearings and having driver ratings above 220 kW (300 HP).

b)

Pumps with dual pressurized seals (arrangement 3) in toxic or hazardous services regardless of driver rating. For overhung pumps, only one seismic vibration transducer is required.

When possible, these transducers shall be located in the bottom half of the bearing housings in the horizontal direction. For the non-drive side, the transducer shall be located on the same radial plane as the thrust bearing. 2.

Pumps equipped with hydrodynamic radial bearings and having driver rating from 220 kW (300 HP) to 746 kW (1,000 HP) shall be provided

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31-SAMSS-004 Centrifugal Pumps

with one seismic vibration transducer reading velocity on each bearing housing in radial direction. 3.

All pumps equipped with hydrodynamic radial bearings and having driver ratings in excess of 746 kW (1,000 HP) shall be provided with the following: a)

Two non-contacting vibration probes in each radial bearing housing,

b)

One seismic vibration transducer reading velocity located on the same radial plane as the thrust bearing. For pumps having driver rating exceeding 1,865 kW (2,500 HP), an additional transducer shall be installed on the other bearing housing. When possible, these transducers shall be located in the bottom bearing housings in the horizontal direction,

c)

One key phasor probe, to measure shaft speed, on the driver shaft. For pump trains equipped with gearbox, a key phasor probe shall be provided on the gearbox output shaft.

d)

Two axial position probes for pumps equipped with thrust hydrodynamic bearings.

4.

For vertically suspended pumps having driver rating of 220 kW (300 HP) or above and are not equipped with thrust bearings, two seismic sensors shall be provided on the thrust bearing housing of the driver. One sensor shall be oriented in the direction of the discharge nozzle axis, and the other at 90 degrees to that direction. For vertically suspended pumps having same power rating as above and are equipped with thrust bearings, two seismic sensors with same orientation as above shall be installed on the pump thrust bearing housing.

5.

If specified, open pit vertically suspended pumps in water applications and having a driver rating of 220 kW (300 HP) or above shall have two seismic sensors installed in the same plane adjacent to the pump bottom bearing. One sensor shall be oriented in the direction of the discharge nozzle axis, and the other at 90 degrees to that direction.

Vibration detectors shall be provided, installed and calibrated in accordance with 34-SAMSS-625. 7.4.2.3

Pumps having driver ratings above 220 kW (300 HP), bearing temperature detectors shall be supplied and installed in accordance with 34-SAMSS-625. For anti-friction bearings, spring loaded temperature sensors shall be provided and mounted in contact with each bearing outer race. Settings for alarm and shut-down shall be recommended by the Vendor. Page 18 of 32

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31-SAMSS-004 Centrifugal Pumps

7.4.2.4

Monitors shall be in accordance with 34-SAMSS-625.

7.4.2.5

Thermocouples shall be in accordance with Form SA-8020-415.

7.4.2.6

Resistance temperature detectors shall be in accordance with Form SA-8020-416.

7.4.3

Controls

7.4.3.1

Electrical installations shall be in accordance with 17-SAMSS-515.

7.4.3.2

Instrumentation systems and connections shall be in accordance with 34-SAMSS-831. Terminals installed outside the control panel shall be mounted in terminal boxes.

7.5

Piping and Appurtenances

7.5.1

General

7.5.1.2

(Modification to the last sentence) Piping and fitting materials in continuous contact with process liquid shall comply with Standard Drawing AD-036821. Piping and fitting materials not in continuous contact with process liquid shall be made of Stainless Steel 316 or 316L. Alternative materials shall be sent for the review and concurrence of the Chairman of Pumps, Seals, and Mixers Standards Committee. Materials in sour services shall be in accordance with NACE MR0175/ISO 15156.

7.5.1.3

(Modification to the second sentence) If this requirement causes difficulty in shipping and handling, piping shall be packed in a wooden box or crate and shall be shipped together with the pump.

7.5.1.6

Auxiliary piping such as vent, drain, external flush, warm-up, external lubrication, and cooling water piping shall be routed to or near the edge of the baseplate and shall terminate with flanged connections. These lines shall have a block valve, ½-inch minimum, located as close as feasible to the pump casing connection. Valves shall be in accordance with API STD 602 Class 800 or ASME B16.34 with rating as required. Instrument valves serving protected instrument areas such as panels and gauge boards may be ½-inch instrument type valves.

7.5.1.7

(Exception) Bolting and fasteners material shall be as per AD-036821.

7.5.1.9

Unions are permitted downstream the isolation valve in none pressurized lines such as lines directed to gravity sewer. Use of any unions in pressurized lines is not allowed. Page 19 of 32

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7.5.1.10

31-SAMSS-004 Centrifugal Pumps

Tubing is not allowed for auxiliary process piping (i.e., auxiliary piping that is subjected to process fluid). Tubing is permitted only for instrumentation piping. Instrumentation piping and tubing shall be per 34-SAMSS-831. Tubing may be used instead of pipe beyond the first valve in non-process auxiliary piping if the following conditions are met: i.

The maximum allowable pressure and temperature limits for tubing are 4 MPa (600 Psig) and 120°C.

ii.

Minimum wall thickness for ½, ¾, and 1-inch tubing are 1.6, 2.4, and 2.8 mm respectively.

iii.

Tubing is not allowed for low temperature applications below -18°C.

iv.

Connectors and adapters shall be compression type meeting UNS S-31600 and ASTM A276.

7.5.1.11

Pipe bends shall have surfaces free of cracks and buckles. Flattening of the cross section of bends shall not exceed 8 percent of the nominal pipe diameter. Bending procedures and heat treatment requirements shall be in accordance with ASME B31.3.

7.5.1.12

Flanges, socket welding and threaded fittings shall be of the class, rating, or wall thickness to match the pipe ratings.

7.5.1.13

All welds must meet the minimum quality requirements of ASME B31.3 together with the following additional requirements: a)

For pipe sizes 2 inch and smaller the first pass of butt welded joints shall be made with Gas Tungsten Arc Welding (GTAW) process.

b)

Permanent backing rings are prohibited, but consumable inserts of the same chemistry as the remaining weld metal may be used.

7.5.1.14

Dissimilar metal welds between ferritic steel and either austenitic stainless steel, duplex stainless steel, or nickel-based alloys as well as use of stainless steel or nickel-based filler metals on ferritic steel are not permitted for pressure containing welds in sour service.

7.5.1.14

Brackets and supports welded on the mechanical equipment or on the baseplate shall have full length welds. Intermittent welding is prohibited. Brackets material shall be selected to prevent galvanic corrosion.

7.5.1.15

Gaskets for raised flanges shall be spiral-wound, Type 316 stainless steel. Gaskets for ring joint flanges shall be soft iron octagonal ring. Gaskets containing asbestos are not permitted. Page 20 of 32

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31-SAMSS-004 Centrifugal Pumps

7.5.1.16

For cooling water piping, a closed sight flow indicators shall be furnished in each cooling water outlet.

7.5.1.17

All piping systems shall be provided with vent valves at highest points and drain valves at lowest points. Horizontal runs in pressure piping shall slope gradually towards drain points. The minimum slope of drain lines shall be 1:50.

7.5.2

Auxiliary Process Fluid Piping

7.5.2.3

(Exception) Piping and fittings materials shall comply with Standard Drawing AD-036821.

7.5.2.5

(Modification) Auxiliary process piping such as pump casing vent and drain piping shall be provided with block valves immediately after the casing connection flange to reduce dead leg length. If this location is not practical due to space limitation or other reasons, the valves may be moved to the nearest possible location to the casing. The valve material shall be as required for the service but as a minimum shall be similar to the auxiliary piping material. Valves shall be in accordance with API STD 602 Class 800 or ASME B16.34 with rating as required.

7.5.2.6

(Exception) Valves are required as indicated in paragraph 6.5.1.6. Casing drain plugs, when allowed, shall be 316 stainless steel unless otherwise specified. For pump casings of austenitic stainless steel or higher grade materials, the casing drain plugs shall be of a non-galling and corrosion resistance material.

7.5.2.8

Use of any unions in pressurized lines is not permitted.

7.5.2.9

Threaded connections shall not be used unless accepted by the Standards Committee Chairman; Pumps, Seals, and Mixers. Threaded connections shall be seal welded (except for instruments and mechanical seal gland connections) for the following: i.

General hydrocarbon

ii.

Other flammable fluids under pressure

iii. Hazardous or toxic fluids iv. Steam at pressures over 1,700 kPa (250 psig) or temperatures over 210°C. Seal welds on threaded connections shall cover all exposed threads after the joint has been tightened to full thread engagement. The fillet seal weld shall have a minimum throat thickness of 3 mm and shall merge smoothly into the pipe metal outside of the thread. Threaded joints to be seal welded shall be Page 21 of 32

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31-SAMSS-004 Centrifugal Pumps

fully cleaned and made up dry without joint compounds or PTFE (Teflon) tape. Threaded connections shall conform to ASME B1.20.1 Pipe Threads. 7.5.2.11

Connections shall be provided throughout the piping system to permit complete removal of the mechanical seal flush piping. In addition, the following shall be provided: a)

Vent connections to allow venting the pump casing, seal chambers and seal piping at high points. The seal chambers vent connections shall be fitted with valves that are suitable for fitting pressure gauges. Needle type block valves are not acceptable. The vent piping might be routed to or near the edge of the baseplate and shall be mutually agreed with the Purchaser. The piping shall terminate with flanged connections.

b)

Drain connections to allow draining the pump casing and seal piping at low points. The drain piping shall be routed to or near the edge of the baseplate and shall terminate with flanged connections.

c)

When seal leakage detection by means of pressure transmitters is specified, the drain and/or vent piping shall be provided with a take-off line from the drain and/or vent line to the pressure transmitter.

d)

For horizontal pump, a casing warm-up line shall be provided if the normal liquid temperature is above 120°C (250°F) or if recommended by pump vendor unless accepted by the Standards Committee Chairman; Pumps, Seals, and Mixers. The warm-up line shall ensure that the pump casing temperature will be within 55°C (100°F) of the process temperature and shall limit the temperature differential between the top and bottom of the casing to 28°C (50°F). As such, the warm-up line is typically located at the bottom of the pump casing for the top-top pump configuration.

7.5.2.12

For horizontal between bearing pumps having driver rating of 3,730 kW (5,000 HP) or higher, a flow or differential pressure transmitter shall be provided in the pump balance line.

7.5.3

Cooling Water Piping

7.5.3.3

Closed sight flow indicators shall be furnished in each cooling water outlet from each bearing, pedestal, etc.

7.5.3.4

Piping and fitting materials shall be ASTM A312 Type 316L and ASTM A182 F316L, respectively. Page 22 of 32

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31-SAMSS-004 Centrifugal Pumps

Inspection, Testing, and Preparation for Shipment 8.1

General

8.1.4

Inspection and testing shall be performed and witnessed or observed as indicated on the pump Data Sheet and the referenced Saudi Aramco Inspection Requirement Form 175-310600, Centrifugal Pumps. The applicable inspection form for Helico-Axial Multiphase Pumps is 175-310800.

8.2

Inspection

8.2.2

Pressure-Casing Materials Inspection

8.2.2.1

Pressure retaining castings shall be examined in accordance with paragraphs 8.2.2.9, 8.2.2.10, and 8.2.2.11, as applicable. Radiographic examination may be substituted by ultrasonic examination, if accepted by the Standards Committee Chairman; Pumps, Seals, and Mixers.

8.2.2.5

Requirements for documentation and witnessing of tests shall be as specified on the Saudi Aramco Inspection Requirement Form 175-310600, Centrifugal Pumps. The applicable inspection form for Helico-Axial Multiphase Pumps is 175-310800. Alternative equivalent international NDT standards are acceptable.

8.2.2.9

100% radiographic examination shall be performed for the following services: a)

Services where the maximum discharge pressure exceeds 900 psig (integrally geared pumps are excluded);

b)

Services where the maximum temperature exceeds 260°C (500°F);

c)

Boiler feed water services where the maximum operating temperature exceeds 149°C (300°F);

d)

Services where the minimum operating temperature is below minus 29°C (minus 20°F);

e)

Auto-ignition services;

f)

Sour services with H2S concentration above 1,000 ppm;

g)

Flashing hydrocarbon services where the maximum discharge pressure exceeds 500 psig.

The radiographic examinations shall be performed to the pressure retaining castings at the following areas: 

Junctions of risers, gates and feeders; Page 23 of 32

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31-SAMSS-004 Centrifugal Pumps



Transition between casing and both suction and discharge nozzles;



Transition between casing and volute flanges;



Transition between casing and feet;



Junction where the casing meets the seal housing.

8.2.2.10

Magnetic particle examination shall be conducted on all accessible surfaces of ferromagnetic castings except machined gasket surfaces.

8.2.2.11

Liquid penetrant examination shall be conducted on all machined gasket surfaces of all materials and on all accessible surfaces of non-ferromagnetic castings.

8.2.3

Auxiliary piping Radiographic Requirements Butt-welds in auxiliary piping shall be subjected to 10 percent random radiographic examination (i.e., one complete girth weld from every 10 girth welds as selected by Buyer's Inspector). However, a minimum of two girth welds shall be radiographed, regardless of the lot size. One hundred percent 100% radiography is required for auxiliary piping in hydrocarbon service on offshore platforms.

8.3

Testing

8.3.1.1

For Helico-Axial Multiphase pumps, detailed test procedures shall be submitted to the Standards Committee Chairman; Pumps, Seals, and Mixers for review and approval. The test procedure shall include the actual measurement uncertainty of all data used in the calculation of flow, head and power as well as all acceptance criteria.

8.3.1.2

For pumps in high temperature water applications, the guaranteed pump efficiency shall not take into consideration the effect of the reduced water viscosity addressed in HI-1.6. NPSH tests are not required for Helico-Axial Multiphase pumps.

8.3.2

Hydrostatic Test

8.3.2.17

Hydrostatic testing with water or light oil is required for all fabricated piping assemblies (Auxiliary piping). Test pressures shall be 150% of the maximum allowable working pressure (MAWP) but not less than gauge press of 1.5 bar (20 psig) in accordance with ISO 10438.

8.3.3

Performance Test

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8.3.3.1

31-SAMSS-004 Centrifugal Pumps

All high energy pumps as specified in 6.1.16 and Helico-Axial Multiphase pumps shall be performance and mechanical run witness tested. Low energy pumps shall all be performance and mechanical run tested. Witness testing on one pump, selected in random, is required.

8.3.3.2.b

Substitute seals may be used for applications having specific gravity less than 0.7 during performance test. Shop buffer/barrier liquid systems may be used during performance test.

8.3.3.3.a

(Exception) Test data shall be taken at shut-off (no vibration data required), minimum continuous stable flow, normal flow, rated flow and 120% (110% for integrally geared pumps) of rated flow. If normal flow is not specified, the pump shall also be tested at mid-point between the minimum continuous stable flow and rated flow. For high energy, as defined in paragraph 6.1.16, and high speed integrally geared pumps, the shut-off test may be substituted by testing at 10% and 15% of best efficiency point capacity, respectively. For variable speed pumps with driver rated above 746 kW (1,000 HP), the test shall also include 5 equally spaced test points from the minimum speed to the maximum speed and at equivalent rated flows (i.e., rated flow with speed adjustment as per affinity law). The performance tests for Helico-Axial Multiphase pumps shall be performed with variation of the Gas Volume Fraction, flow rate and speed up to rated speed. For each test curve at least five different flow rates shall be performed except at low speed.

8.3.3.3.b

High energy pumps are as defined in paragraph 6.1.16.

8.3.3.3.c

Test speed shall be within 3% of the rated speed except for Helico-Axial Multiphase pumps. Reduced test speed requires the review and concurrence of the Standards Committee Chairman; Pumps, Seals, and Mixers. The vibration acceptance criteria contained in this specification are not applicable to reduced test speed. The Vendor shall propose the vibration acceptance levels at the reduced speed for review and approval by the Standards Committee Chairman; Pumps, Seals, and Mixers. In addition, bearing-housing resonance test shall be conducted when testing at reduced speed.

8.3.3.3&4 (Modification) the pump performance tolerances shall be per the below modified Table 16.

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31-SAMSS-004 Centrifugal Pumps

Table 16 - Performance Tolerances Rated Point %

Normal Point (Note 1) %

Shutoff %

±3 ±3 ±2

±3 ±3 ±2

± 10a ± 8a ± 5a

Rated power

b

b

Efficiency

c

c

Rated NPSH

0

Condition Differential head: 0 m to 75 m (0 ft to 250 ft) > 75 m to 300 m ( 250 ft to 1,000 ft) > 300 m (1,000 ft)

Note 1: The normal point guarantees are only applicable to pumps with driver rated 373 kW (500 HP) and above. a If a rising head flow curve is specified (see 6.1.11), the negative tolerance specified here shall be

allowed only if the test curve still shows a rising characteristic. b With test results corrected to rated conditions [see 8.3.3.3 b)] for flow, speed, density (specific gravity)

and viscosity, it is necessary that the power not exceed the same tolerance allowed for the differential head, from all causes (cumulative tolerances are not acceptable). c Negative tolerance is not allowed.

For Helico-Axial Multiphase pumps, performance acceptance criteria shall be reviewed and approved by the Standards Committee Chairman; Pumps, Seals, and Mixers. 8.3.3.5.c

If applicable, the bearing metal temperatures and bearing oil temperatures shall be measured and recorded throughout the test.

8.3.3.7.c

When a re-test is required, all data of original parameters including bearing vibration and temperature data shall again be recorded and submitted to the purchaser for review and approval.

8.3.3.9

For variable speed pumps with driver rated above 746 kW (1,000 HP) and multiphase pumps, coast down vibration test data shall be recorded to verify pump critical speed and bearing housing resonance.

8.3.3.10

The impellers shall not be modified after the witness test to correct hydraulic performance by underfiling, overfilling, V-cutting, or any other modifications unless accepted by the Standards Committee Chairman; Pumps, Seals, and Mixers. If accepted, the Vendor shall submit a drawing showing the details of the modification. This drawing shall also be included in the Operation and Maintenance Manual.

8.3.4.2

Mechanical Run Test

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31-SAMSS-004 Centrifugal Pumps

On completion of the performance test and after bearings' and oil temperature stabilization has been achieved, the pump shall be run at rated flow for the following continuous period: a)

Pumps having driver ratings up to 560 kW (750 HP) shall be run for not less than one hour;

b)

Pumps having driver ratings greater than 560 kW (750 HP), up to 1,865 kW (2,500 HP) shall be run for not less than two hours;

c)

Pumps having driver ratings greater than 1,865 kW (2,500 HP) shall be run for not less than four hours.

For Helico-Axial Multiphase pumps, the mechanical run test shall be conducted for not less than 4 hours at the duty point.

8.3.4.3

NPSH Test

8.3.4.3.1

NPSH3 shall be determined at each test point identified in 8.3.3.3 a) except shut-off. This test is not required for Helico-Axial Multiphase pumps. Open pit vertical sump pumps shall have a minimum submergence test in lieu of NPSH test.

8.3.4.3.5

NPSH3 witnessed testing shall be performed for all high energy pumps, as defined in paragraph 6.1.16. NPSH3 testing shall be performed for all can mounted vertical pumps (type VS6 and VS7) and all pumps where the NPSH margin (NPSHA over NPSH3) at 120% (110% for integrally geared pumps) of the rated flow is less than 3 feet. Only one pump of a set of identical pumps is required to be witnessed. For all other pumps, only one pump of a set of identical pumps shall be NPSH3 tested and witnessed.

8.3.4.7

The bearing housing(s) resonance test shall be conducted for variable speed pumps with driver rated power above 746 kW (1,000 HP) and for reduced speed test on all between bearings pumps. The natural frequencies shall be obtained for the vertical and horizontal directions and shall have a separation margin of at least 15% from the listed excitation frequencies from minimum to maximum operating speeds.

8.4

Preparation for Shipment

8.4.1

All rotors shall be properly secured to prevent axial and radial movement.

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31-SAMSS-004 Centrifugal Pumps

8.4.5

The corrosion resistant metal tag shall be stamped in accordance with the Purchase Order.

8.4.13

All loose materials and mill scale shall be removed by blasting to Sa 2 or by pickling from reservoirs, tanks, coolers, filters, bearing housings and other components with which lube oil comes into contact.

8.4.14

Small or fragile components shall be removed, tagged, wrapped in waterproof material and packed in a box, fastened to the unit skid or baseplate.

Specific Pump Types 9.1

Single-stage Overhung Pumps

9.1.1

For services where suspended solids are specified, use of impeller having back wear ring diameter larger than the impeller balance holes circle diameter by more than 50 mm (2 in) requires review and concurrence by the Standards Committee Chairman; Pumps, Seals, and Mixers.

9.1.2

Vertical In-line (Type OH3) Pumps

9.1.2.7

(Exception) Approval shall be by the Standards Committee Chairman; Pumps, Seals, and Mixers.

9.1.3

Integral Gear-driven (Type OH6) Pumps

9.1.3.8

O-ring sealing surfaces may have surface finish of up to 80 Ra.

9.1.3.9

Mechanical seals are not required to comply with 31-SAMSS-012. The seal chamber pressure and support systems for contacting wet seals (excluding containment seals) shall be designed for a margin of not less than 30% between seal chamber pressure and maximum fluid vapor pressure, or a 20°C (36°F) product temperature margin based on the maximum process fluid temperature.

9.1.3.10

Vendor's standard balancing of impeller, inducer, and high speed shaft is acceptable.

9.1.3.11

Couplings meeting the requirement of ANSI/AGMA 9000 Class 8 is acceptable and coupling component balancing is not required.

9.1.3.12

Vendor's standard oil temperature and pressure gauges are acceptable.

9.1.3.13

The maximum gearbox oil temperature shall not exceed 90°C (194°F).

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31-SAMSS-004 Centrifugal Pumps

9.1.3.14

Vendor's standard gearbox is acceptable. The gearbox maximum power rating shall not be less than 125% of the pump power at rated point. In addition to the vibration requirements in Section 7.4.2.2 of this specification, the gearbox casing vibration shall not exceed 7G's RMS.

9.2

Between-Bearings Pumps (types BB1, BB2, BB3, and BB5)

9.2.1

Pressure Casings

9.2.1.2

(Exception) Shaft centerline supported casings are required for horizontal pumps handling liquids with temperatures in excess of 120°C (250°F) or below 0°C (32°F).

9.2.2

Rotor

9.2.2.5

The use of balancing disk or a combination of balancing drum/disk to balance the hydraulic thrust of the pump is not acceptable.

9.2.3.2

Reduction in balance drum clearances up to 75% of Table 6 “minimum internal running clearances” can be proposed with conditions. The vendor shall provide his experience list in identical pumps with same material to Standards Committee Chairman; Pumps, Seals, and Mixers for review and approval. The rotor dynamic study shall indicate no touch due to deflection.

9.2.6

Lubrication

9.2.6.2

For pumps having driver rating of 2,240 kW (3,000 HP) or less and having pressure lubrication system, the system shall comply with 32-SAMSS-013 Chapters 1&3 and shall also be provided with: a.

Dual shell and tube or an air heat exchanger.

b.

Austenitic stainless steel reservoir.

c.

The piping connection for the bypass control valve shall be located upstream of the cooler.

9.2.6.4

For pumps having driver rating exceeding 2,240 kW (3,000 HP), a pressure lubrication system shall be provided and shall be in accordance with 32-SAMSS-013 Chapters 1&2.

9.2.6.5

If oil circulating system is specified or is recommended by Vendor, the oil circulating system shall be provided and shall be in accordance with Standard Drawing AA-036859.

9.3

Vertically Suspended Pumps (Types VS1 through VS7)

9.3.2

Pressure Casings Page 29 of 32

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31-SAMSS-004 Centrifugal Pumps

9.3.2.2

Vertical double casing pumps shall have provision for complete venting of the outer casing without requiring removal of the pump. This provision shall consist of 1 inch pipe connection, terminating in 1 inch valve.

9.3.3

Rotors

9.3.3.3

Lineshaft sections shall have a minimum length of 3 m (10 ft), unless otherwise accepted by the Standards Committee Chairman; Pumps, Seals, and Mixers. Lineshafts shall be machined or ground throughout their entire length. The total indicated runout shall not exceed 4 micrometers per 100 mm (0.0005 in per foot) of the shaft length. The total runout shall not exceed 125 micrometers (0.005 in) over the total shaft length.

9.3.5

Dynamics (Modification) If lateral analysis is required based on Table 18, the Vendor shall submit an analysis report for review and concurrence by the Standards Committee Chairman; Pumps, Seals, and Mixers.

9.3.8

Accessories

9.3.8.2

Couplings and Guards

9.3.8.3

Mounting Plates

9.3.8.3.1

(Modification) The use of through bolting is not mandatory.

9.3.8.3.2

(Modification) Alignment positioning screws shall be provided for each drive train component that has a mass greater than 100 kg (225 lbs).

9.3.8.3.3

A separate soleplate for bolting and grouting to the foundation shall be provided.

9.3.9.1

Reduced length test for vertical suspended pumps is not acceptable unless accepted by the Standards Committee Chairman; Pumps, Seals, and Mixers.

9.3.10

Single-case Diffuser (VS1) and Volute (VS2) Pumps

9.3.10.6

(Modification) For column sizes of 200 mm (8 in) inside diameter or larger, column sections shall be flanged with rabbet fits.

9.3.11

Single-casing Axial Flow (VS3) Pumps

9.3.11.2

(Modification) For column sizes of 200 mm (8 in) inside diameter or larger, column sections shall be flanged with rabbet fits.

9.3.13

Double-casing Diffuser (VS6) and Volute (VS7) Pumps Page 30 of 32

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31-SAMSS-004 Centrifugal Pumps

9.3.13.4

The casing vent connections shall terminate in a 1 inch valve. Seal chamber vent connections shall terminate in a ½ inch valve.

9.3.13.5

The suction can (barrel) shall be provided with a 2 inch drain pipe inside the can. It shall be piped to the surface and terminated in a 2 inch valve. Flanged connection shall be provided to allow disconnection of the pipe from the discharge head. Also, a 2 inch purging connection with an isolation valve and a check valve shall be provided. Use of smaller piping sizes requires review and concurrence by the Standards Committee Chairman; Pumps, Seals, and Mixers.

Guarantee and Warranty In addition to the guarantee and warranty specified in contract or purchase order documents, the power and efficiency at the normal operating point for pumps with hydraulic power of 373 kW (500 HP) and larger shall be guaranteed in accordance with following table: Tolerances Power at normal operating point Efficiency at normal operating point Note (1)

Note (1) Negative tolerance is not allowed.

The positive tolerance in the power is allowed only due to positive tolerance in the head at normal operating point. The tolerances for head at normal operating point are shown in the modified Table 16 in paragraph 8.3.3.3&4 above.

If the power at the normal flow (corrected for the pumped fluid), when tested in Vendor factory, is found to be more than the guaranteed power due to reduction in efficiency, the cost of the equipment shall be reduced by an amount (liquidated damage) equal to the difference between the actual power and the guaranteed power (in kilowatts at the rated operating point) multiplied by the Evaluation Factor $/kW given in the data sheet and/or in the purchase order. This reduction shall not be more than 15% of the equipment purchase order value. The Vendor understands and agrees that the foregoing reduction is not a penalty but is a fair and reasonable pre-estimate of the amount of actual loss and damage that would be suffered by Saudi Aramco as a result of the reduced efficiency of the equipment.

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Document Responsibility: Pumps, Seals, and Mixers Standards Committee Issue Date: 1 January 2018 Next Planned Update: 1 January 2020

31-SAMSS-004 Centrifugal Pumps

Revision Summary 21 August 2014 1 January 2017

Major revision Major revision. The following were done to minimize cross referencing in addition to other major enhancements based on latest project observations, deviations, and comments. Below is the summery of the main changes: (1) Eliminate the reference to auxiliary piping standard 01-SAMSS-017 which is planned for deletion by end of 2016 and align with international standard requirements. (2) Add a new requirements to prevent excessive pump oversizing and to ensure having normal flow close to best efficacy. (3) Allow higher minimum continuous stable flow for water injection pumps. (4) Allow reduced head rise and cut water clearance. This should improve pump efficiency and provide better pump selection without jeopardizing reliability. (5) Mandate minimum efficiency for pumps above 50HP. (6) Change the flowrate and the driver power limits for overhung pumps from 300 m³/hr and 250 HP to 600 m³/hr and 300 HP. (7) Align with API 610 vibration limits. (8) Mandate approval for repairing castings with more than 3 major defects. (9) Mandate vibration monitoring on pumps with dual pressurized seals since these pumps are used for highly hazardous liquids. (10) Mandate balance line flow monitoring for pumps above 5,000 HP. (11) Add new requirement for variable speed pump testing. (12) Allow a combined oil lubrication and seal barrier system for pumps above 3,000 HP. (13) Mandate conducting life cycle assessment for pumps above 500 HP instead of 1,000 HP.

1 January 2018

Editorial revision to modify and/or delete paragraphs 6.9.3.6, 7.1.7, 9.3.8.2.1, and as marked.

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