Blasting And Coating Procedure

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PROJECT / CONTRACT REF.: 2546 / GC07100300

ENGINEERING,PROCUREMENT,INSTALLATION AND COMMISSIONING(EPIC) FOR BERTHS AND PORT INFRASTRUCTURE FOR RAS LAFFAN PORT EXPANSION PROJECT

DOCUMENT TITLE :

BLASTING & COATING PROCEDURE FOR FABRICATED STEEL STRUCTURE

TEYSEER CONTRACTING CONSOLIDATED CONTRACTORS

COMPANY

Reference NO. : RLP/965/2009/F-1308 Originators Doc. Ref. : RSC/F0658/QC-009 Rev.-01

GROUP

29-APR-2009

0

DATE

REV. NO.

DOC. NO:

ISSUED FOR REVIEW & APPROVAL REASON FOR REVISION

SUJITH

Sunith

Sunith

Prepared

Checked

Approved

AL REYAMI

Checked

Approved

CCC

BLASTING & COATING PROCEDURE FOR FABRICAT STEEL STRUCTURE Doc No.: RSC/F0658/QC-0009 Rev.01

TABLE OF CONTENTS

1. SCOPE……………………………………………………………………………………………….03 2. PURPOSE…………………………………………………………………………………..……….03 3. REFERENCES……………………………………………………………………………………...03 4. RESPONSIBILTY…..………………………………………………………………………………03 5. SAFETY AND ENVIRONMENTAL RISKS……………………………………………………….03 6. INSPECTION & TEST EQUIPMENT……………………………………………………………..04 7. MATERIAL CONTROL……………….………………………………………………………...….04 8. PAINT SYSTEM QUALIFICATIONS…………………………………………………...……..….05 9. SURFACE PREPARATION………………………………………………………………………..05 10. WEATHER CONDITIONS……………………………………………………………………….…05 11. COATING…………………………………………………………………………...………..……...06 12. REPAIR……………………………………………………………………………….…………..…07 13. IDENTIFICATION AND MARKING……………………………………………………………….07 14. HANDLING…………………………………………………………………..………………………07 15. DESPATCH………………………………………………………………………………………….08 ATTACHMENT 1.FORM NO C7 F4 REV.0……………………………………………………1 SHEET

1.

SCOPE

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BLASTING & COATING PROCEDURE FOR FABRICAT STEEL STRUCTURE Doc No.: RSC/F0658/QC-0009 Rev.01

This procedure is applicable for the manual / semi automatic blasting and coating of the structural steel manufactured by Al Reyami for Berths and Port Infrastructure for Ras Laffan Port Expansion Porject

2.

PURPOSE Purpose of this procedure is to identify the sequence to be followed during the manual / semi automatic blasting and coating work. Inspection and testing requirements shall be as per Project specific Inspection and Test Plan (ITP)

3.

REFERENCES RPGE-1-14-0004 Rev. A QP-SPC-L002

- Specification for structural steel works - Specification for painting & wrapping of metal surfaces

SSPC-SP-5 8501 Sa 3 Inspection & Test Plan for the Fabrication of Structural Steel.

4.

RESPONSIBILITIES QA/QC

Department is responsible for the review, control and implementation of this

procedure. Production Department is responsible for the implementation of this procedure during the blasting and coating activities.

5.

SAFETY AND ENVIRONMENTAL RISKS •

All personnel involved in fabrication/erection works shall be informed of hazards and will adopt preventive measures.



All electrical equipment shall be properly grounded.



All regular PPE shall be used i.e. hard hat, safety glasses, safety footwear & gloves. A full body safety harness shall be worn by all workers working at high elevations and properly clipped to anchor point at all times.



Painters should wear Mask while working.



The area should be isolated so as to avoid any overspray.



Avoid contact with skin and inhalation of vapor.

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BLASTING & COATING PROCEDURE FOR FABRICAT STEEL STRUCTURE Doc No.: RSC/F0658/QC-0009 Rev.01

6.



Do not eat, drink or smoke in the workplace.



Wash Hands properly prior to eating or drinking.



Ensure experienced and trained personnel are engaged for Blasting and Painting jobs.

INSPECTION AND TEST EQUIPMENT The following inspection /testing equipments shall be available at site to ensure that the correct inspection and testing are carried out:-

7.



Anchor pattern and measuring device.



Wet film thickness (WFT) gauge.



Dry film thickness (DFT) gauge.



Contact thermometer (for steel surfaced temperature).



Thermometer for air temperature.



Humidity gauge (or sling hygrometer).



Dew point calculator.

MATERIAL CONTROL •

Pipe supports to be coated shall be fully identified and to be released for coating with approval.



Coating shall be done as per the QP specification QP-SPC-L-002 coating schedule 1 un.



All painting material shall confirm to the approved MAR (Material Approval Request).

Primer coat

:

Hempel , Hempadur Zinc-15350.

Mid coat 1 & 2 :

Hempel , Hempadur MIO 47950

Final coat

Hempel , Hempathane Top coat 55210(RAL-10A03).



:

Paint material shall be verified against the batch certificates & stored in controlled environment .The shelf life shall be monitored while receipt and issue.

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BLASTING & COATING PROCEDURE FOR FABRICAT STEEL STRUCTURE Doc No.: RSC/F0658/QC-0009 Rev.01



The abrasive medium shall be used which is able to achieve the anchor profile, either metallic or non metallic abrasive, specified on the coating manufacturer’s data sheet.



All materials received to complete the work shall be inspected to ensure that they conform to the project specifications, purchase, order, codes and standards. These inspection findings shall be recorded.



The coating materials that are to be used for this project shall be submitted to the contractor / client for approval prior to commencement of the coating activities.

8.

PAINT SYSTEM QUALIFICATIONS •

Paint system qualifications shall be conducted under paint manufacturer supervision, duly witnessed by Client/TPI.

9.

SURFACE PREPARATION •

Pipe supports shall be visually inspected to check whether the surface requires additional cleaning, either solvent or detergent, prior to the start of the abrasive blasting activities. All blast cleaning activities shall be done in accordance with the requirement of QP-SPC-L-002.“QP Technical specification for painting and wrapping of metal surface” or the coating manufacturer’s recommendations.



Compressed air supply shall be checked at specified intervals to ensure that air is moisture and oil free.



Manual / semi automatic blast technique shall be used to gain the correct surface preparation and anchor profile for the application of coating.



Used abrasive shall be removed from metal surfaces using a dry brush and blowing down with clean dry compressed air.



When blasting is completed , the surface of the support shall be inspected to check whether it meets the requirement of SA3, ISO 8501-1 or SSPC-SP-5 as per QPSPC-L-002 REV1. Profile range 50 to 70 microns.



After cleaning, the surface shall be kept away from oil, dirt etc. till the coating is completed. Surface shall be coated within 4hours, depending upon the whether conditions; surface not meeting the blasting profile shall be re-blasted prior to coating.

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BLASTING & COATING PROCEDURE FOR FABRICAT STEEL STRUCTURE Doc No.: RSC/F0658/QC-0009 Rev.01

10.

WEATHER CONDITIONS Blasting operation should not be started if related humidity of the air exceeds 85% or the Metal Surface temperature is not least 3 degree centigrade above the dew point temperature. Priming and painting can be done when the weather condition are within the requirement of project specification or paint manufacturer’s recommendations

11.

COATING •

Stripe coat shall be applied at weld & corners.



Spraying shall not be started until all the specified environment reading are taken and are within specified limits.



Selection of materials, mixing, induction time, and pot life requirement, adequate application and achieved WFT shall be to the relevant specification/manufacturers recommendation and shall be overseen and monitored by the supervisor.



The spray operator shall monitor the WFT reading during the spraying to control and achieve the specified DFT.



After the paint manufacturer’s recommended drying time, each coat shall be inspected by Al Reyami Inspector to confirm the DFT and integrity by adhesion on testing of the coating system.



Primer, intermediate coat and top coat shall be as per project specification QP-SPC-L002 coating schedule 1un.



Prior to application of primer all difficulties to coat areas such as corners, edges and welds shall be brush coated with the specified primer.



The first coat ,one coat primer ,Hempel-Hempadur Zinc 15350 grey color shall be applied manually by airless spray techniques with a minimum WFT of 100 to 125 microns to achieve the specified minimum DFT of 50 microns.



Primer application, pot life and recoat intervals shall be as per the paint manufacturer’s data sheet or recommendations.



The intermediate coats shall be applied as specified by project specification.

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BLASTING & COATING PROCEDURE FOR FABRICAT STEEL STRUCTURE Doc No.: RSC/F0658/QC-0009 Rev.01



Two intermediate coats shall be applied as per the project specifications the DFT of 100 microns on each coat.



The first intermediate coat Hempel-Hempadur Mastic MIO 47950 light grey shall be applied manually by airless spray techniques with a minimum WFT of 125 to 150 microns to achieve minimum DFT of 100 microns after the recoat interval of the previous coat.



The second intermediate coat, Hempel-Hempadur mastic MIO 47950 dark grey color shall be applied manually by airless spray technique with a minimum WFT of 125 to 150 microns to achieve minimum DFT of 100 microns after the recoat interval of the previous coat .



The final coat , Hempel –Hempathane topcoat 55210 grey shall be applied manually by airless spray technique with a minimum WFT of 100 microns to achieve a minimum DFT of 50 microns after the recoat interval of previous coat.

12.

REPAIR • When the coating is damaged back to the base metal that is areas of the metal substrate are exposed, the exposed metal shall be blast cleaned to the original specified standard prior to Re-painting it. • For small and isolated area or where the use of blast cleaning is not practical, hand tool / power tools can be used to obtain the required and or profile. As with partially damaged coating, the periphery of the repair areas shall be feathered back for at least 25mm from the edge of coating to the adjacent undamaged coating to produce a smooth chamfered surface profile for the repair coating .This can be done by either power tool or hand tool or both. • The prepared partially or completely damaged areas of the coating shall be repaired by the local application of the repair number of coats of paint to obtain the original coating system and thickness.

13.

IDENTIFICATION & MARKING All structural components shall be identified as per the project spec. RPGE- 1-14-0004 REVA. & AFC shop drawing requirements. Identification shall be done by proper metal stamping

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BLASTING & COATING PROCEDURE FOR FABRICAT STEEL STRUCTURE Doc No.: RSC/F0658/QC-0009 Rev.01

before blasting and painting application. A job stencil or metal tag shall be applied in accordance with project specification and after paint curing. 14.

HANDLING During and after coating the structural steel is moved by crane or forklift with contact surfaces of a soft material. The coated structural steel shall be stored on a suitable soft surface and allowed to full cure as per the paint manufacturer’s requirements.

15.

DESPATCH Structural steel shall be dispatched from Al Reyami if all documents are in order, signed as accepted .Shipping shall be carried out in accordance with client /contractors requirements.

16.

ATTACHMENT. •

PAINTING REPORT –C7F4 REV.-0

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