Job Procedure For Holiday Detection (using Low /high Voltage)
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Job Procedure for Holiday Detection (Using low /High Voltage)
Document No:
QHSE/ P 11/CNDT/ JP09 /HD
Rev
07
Issue Date
Prepared by:
Reviewed by:
Approved by:
Name & Signature: Vipin Kumar
Name & Signature: Prakriti Samanta
Name & Signature: Ganesh Babu
28 Dec 2017
Date: 28 Dec 2017
Date: 28 Dec 2017
Date: 28 Dec 2017
Job Procedure for Holiday Detection (Using Low/High Voltage)
CONTENTS
Section
Description
Page No.
AMENDMENT RECORD
3
1.
SCOPE
4
2.
EQUIPMENT
4
3.
PRINCIPLE OF OPERATION
5
4.
PROPERTIES OF COATING
5
5.
SURFACE PREPARATION
5
6.
SAFETY
6
7.
CALIBRATION TEST
6
8.
SEQUENCE OF OPERATION
6
9.
SAMPLE REPORT FORMAT
8
Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
Page 2 of 8
Job Procedure for Holiday Detection (Using Low/High Voltage)
AMENDMENT RECORD Revision No.
Date of Amendment
Section / Checklist Amended
07
28 Dec 2017
Sec 9
Section 9 (Report format)
Sec 9
Section 9 report format modification
06
26 Dec 2016
Name Amendment Details
Reviewed
Approved
Prakriti Samanta
Ganesh Babu
Prakriti Samanta
Ganesh Babu
Prakriti Samanta
Ganesh Babu
05
03 Jan 2016
All
Overall formatting and old Procedure Reference No. Aries/HD/02 changed to new number P 11/CNDT/JP09 HD
04
09 Sep 2015
All
Revised
Ganesh Babu
Ramasamy
03
16.05.2013
Revised
Ganesh Babu
Ramasamy
02
16.11.2010
Revised
Jessen P.
Ramasamy
01
10.08.2009
Revised
Jessen P.
Ramasamy
00
10.08.2001
Initial Issue
Jessen P.
Ramasamy
All
Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
Page 3 of 8
Job Procedure for Holiday Detection (Using Low/High Voltage)
1.
SCOPE
To detect pin holes, holidays (small uncoated area), inclusions, air bubbles, cracks, scratches or other coating faults over Paint coated surfaces. 2.
EQUIPMENT
The high DC voltage instrument can be used to test coatings up to 7mm (275 mils) thick and is ideal for inspecting coatings on pipeline and other protective coatings. The instrument will
operate in one of three voltage ranges; 0.5 kV to 5 Kv, 0.5 to 15Kv, and 0.5 kV to 30Kv... Name
: Elcometer 280 pulsed DC Holiday Detector – Model T
Made
: Elcometer
Operate in one of three voltage ranges; 0.5 kV to 5 Kv, 0.5 to 15Kv, and 0.5 kV to 30Kv... Name
: Elcometer 280 pulsed DC Holiday Detector – Model T
Made
: Elcometer
Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
Page 4 of 8
Job Procedure for Holiday Detection (Using Low/High Voltage) 3.
PRINCIPLE OF OPERATION
Steel Plate is coated with Paint with the thickness above 500 micron. High voltage holiday detectors are used to inspect these coatings for pin holes, scratches or other coating faults. The handle of the instrument generates a high DC voltage which is applied to the surface of coating via a probe. An earth signal return cable is connected between the instrument and the substrate. When the probe is passed over a coating flaw, the electrical circuit is completed and current flows from the probe to the substrate. As a result, the instrument gives audible, visual alarms and a spark may be produced at the flaw. The electric connection between Equipment and test specimen shall be as described in the drawing.
4.
PROPERTIES OF COATING
The coating under test can be electrically non-conductive or partially conductive (such as coating which contain metallic or carbon particles).The coating must be at least 200 micron (0.008”) thick, and preferably over 500 micron thick. The underlying substrate must be an electrically conductive material such as metal or concrete. 5.
SURFACE PREPARATION
The testing location should be free from solvents or other ignitable materials from the coating activities left in the test area, particularly in confined areas such as tanks. Testing is applicable only on coating that are cured, thickness tested and visually inspected and accepted. Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
Page 5 of 8
Job Procedure for Holiday Detection (Using Low/High Voltage) 6.
SAFETY
6.1.
Plant
Before carrying out the test procedure, consult the plant or safety officer for clearing of other personnel and keep the test area clear and to help with the testing procedure. 6.2.
Work piece
Bond the work piece to a ground potential to minimize the potential for buildup of static charge. 6.3.
Equipment
Ensure the earth signal return cable is connected to the conducting substrate before switching on the instrument. 7.
CALIBRATION TEST
7.1.
When the detector is switched on, or after changing voltage, the unit will test the calibration of the internal voltage and sensitivity setting. This test takes approximately four seconds.
7.2.
At the end of the test, a spark introduced in between the substrate and the brush/coil with an audible beep sound indicates a successful test.
8.
SEQUENCE OF OPERATION
8.1.
Connecting the high voltage handle to the instrument.
8.2.
Connect the clamp of the earth signal return cable to an exposed section of substrate and plug the other end of the cable into the instrument.
8.3.
Select the probe best suited for the work and attach it to the high voltage handle.
8.4.
Check the cable connections, set test voltage and sensitivity etc. Voltage setting can be done by manual or automatic. Automatic setting of voltage depends on the selection of test standards and coating thickness.
8.5.
Perform the calibration before conducting the test.
8.6.
Select the test voltage in kV according to the standards.
8.7.
Holding the high voltage handle firmly, ensure that finger grasp and squeeze the black rubberized grip on the underside of the handle.
Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
Page 6 of 8
Job Procedure for Holiday Detection (Using Low/High Voltage) 8.8.
With the probe in free air, press and release the button on the handle to switch on the high voltage. The red light on the handle will illuminate and the instrument will emit a regular clicking, indicating that the probe s at high voltage.
8.9.
Place the probe on the test surface.
8.10. Keeping the probe in contact with the surface, move it over the work area at a speed of approximately one meter in every four seconds, 0.25 m/s. 8.11. Any flaws in the coating will be indicated by one or more of the following; A spark is seen between the probe and surface. The blue light on the high voltage handle flashes. The alarm sounds. The alarm icon is shown on the display. The display black light flashes. 8.12. If needs to test in more than one location, always switch off the instrument before disconnecting any cables, re attaching the cables in new test locations and before recommencing testing repeat the steps.
Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
Page 7 of 8
Job Procedure for Holiday Detection (Using Low/High Voltage)
9.
SAMPLE REPORT FORMAT( Ref: ARIES-AMES-HDT/01 Rev 00)
Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
7
Page 8 of 8
Document No:
QHSE/ P 11/CNDT/ JP09 /HD
Rev
07
Issue Date
Prepared by:
Reviewed by:
Approved by:
Name & Signature: Vipin Kumar
Name & Signature: Prakriti Samanta
Name & Signature: Ganesh Babu
28 Dec 2017
Date: 28 Dec 2017
Date: 28 Dec 2017
Date: 28 Dec 2017
Job Procedure for Holiday Detection (Using Low/High Voltage)
CONTENTS
Section
Description
Page No.
AMENDMENT RECORD
3
1.
SCOPE
4
2.
EQUIPMENT
4
3.
PRINCIPLE OF OPERATION
5
4.
PROPERTIES OF COATING
5
5.
SURFACE PREPARATION
5
6.
SAFETY
6
7.
CALIBRATION TEST
6
8.
SEQUENCE OF OPERATION
6
9.
SAMPLE REPORT FORMAT
8
Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
Page 2 of 8
Job Procedure for Holiday Detection (Using Low/High Voltage)
AMENDMENT RECORD Revision No.
Date of Amendment
Section / Checklist Amended
07
28 Dec 2017
Sec 9
Section 9 (Report format)
Sec 9
Section 9 report format modification
06
26 Dec 2016
Name Amendment Details
Reviewed
Approved
Prakriti Samanta
Ganesh Babu
Prakriti Samanta
Ganesh Babu
Prakriti Samanta
Ganesh Babu
05
03 Jan 2016
All
Overall formatting and old Procedure Reference No. Aries/HD/02 changed to new number P 11/CNDT/JP09 HD
04
09 Sep 2015
All
Revised
Ganesh Babu
Ramasamy
03
16.05.2013
Revised
Ganesh Babu
Ramasamy
02
16.11.2010
Revised
Jessen P.
Ramasamy
01
10.08.2009
Revised
Jessen P.
Ramasamy
00
10.08.2001
Initial Issue
Jessen P.
Ramasamy
All
Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
Page 3 of 8
Job Procedure for Holiday Detection (Using Low/High Voltage)
1.
SCOPE
To detect pin holes, holidays (small uncoated area), inclusions, air bubbles, cracks, scratches or other coating faults over Paint coated surfaces. 2.
EQUIPMENT
The high DC voltage instrument can be used to test coatings up to 7mm (275 mils) thick and is ideal for inspecting coatings on pipeline and other protective coatings. The instrument will
operate in one of three voltage ranges; 0.5 kV to 5 Kv, 0.5 to 15Kv, and 0.5 kV to 30Kv... Name
: Elcometer 280 pulsed DC Holiday Detector – Model T
Made
: Elcometer
Operate in one of three voltage ranges; 0.5 kV to 5 Kv, 0.5 to 15Kv, and 0.5 kV to 30Kv... Name
: Elcometer 280 pulsed DC Holiday Detector – Model T
Made
: Elcometer
Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
Page 4 of 8
Job Procedure for Holiday Detection (Using Low/High Voltage) 3.
PRINCIPLE OF OPERATION
Steel Plate is coated with Paint with the thickness above 500 micron. High voltage holiday detectors are used to inspect these coatings for pin holes, scratches or other coating faults. The handle of the instrument generates a high DC voltage which is applied to the surface of coating via a probe. An earth signal return cable is connected between the instrument and the substrate. When the probe is passed over a coating flaw, the electrical circuit is completed and current flows from the probe to the substrate. As a result, the instrument gives audible, visual alarms and a spark may be produced at the flaw. The electric connection between Equipment and test specimen shall be as described in the drawing.
4.
PROPERTIES OF COATING
The coating under test can be electrically non-conductive or partially conductive (such as coating which contain metallic or carbon particles).The coating must be at least 200 micron (0.008”) thick, and preferably over 500 micron thick. The underlying substrate must be an electrically conductive material such as metal or concrete. 5.
SURFACE PREPARATION
The testing location should be free from solvents or other ignitable materials from the coating activities left in the test area, particularly in confined areas such as tanks. Testing is applicable only on coating that are cured, thickness tested and visually inspected and accepted. Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
Page 5 of 8
Job Procedure for Holiday Detection (Using Low/High Voltage) 6.
SAFETY
6.1.
Plant
Before carrying out the test procedure, consult the plant or safety officer for clearing of other personnel and keep the test area clear and to help with the testing procedure. 6.2.
Work piece
Bond the work piece to a ground potential to minimize the potential for buildup of static charge. 6.3.
Equipment
Ensure the earth signal return cable is connected to the conducting substrate before switching on the instrument. 7.
CALIBRATION TEST
7.1.
When the detector is switched on, or after changing voltage, the unit will test the calibration of the internal voltage and sensitivity setting. This test takes approximately four seconds.
7.2.
At the end of the test, a spark introduced in between the substrate and the brush/coil with an audible beep sound indicates a successful test.
8.
SEQUENCE OF OPERATION
8.1.
Connecting the high voltage handle to the instrument.
8.2.
Connect the clamp of the earth signal return cable to an exposed section of substrate and plug the other end of the cable into the instrument.
8.3.
Select the probe best suited for the work and attach it to the high voltage handle.
8.4.
Check the cable connections, set test voltage and sensitivity etc. Voltage setting can be done by manual or automatic. Automatic setting of voltage depends on the selection of test standards and coating thickness.
8.5.
Perform the calibration before conducting the test.
8.6.
Select the test voltage in kV according to the standards.
8.7.
Holding the high voltage handle firmly, ensure that finger grasp and squeeze the black rubberized grip on the underside of the handle.
Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
Page 6 of 8
Job Procedure for Holiday Detection (Using Low/High Voltage) 8.8.
With the probe in free air, press and release the button on the handle to switch on the high voltage. The red light on the handle will illuminate and the instrument will emit a regular clicking, indicating that the probe s at high voltage.
8.9.
Place the probe on the test surface.
8.10. Keeping the probe in contact with the surface, move it over the work area at a speed of approximately one meter in every four seconds, 0.25 m/s. 8.11. Any flaws in the coating will be indicated by one or more of the following; A spark is seen between the probe and surface. The blue light on the high voltage handle flashes. The alarm sounds. The alarm icon is shown on the display. The display black light flashes. 8.12. If needs to test in more than one location, always switch off the instrument before disconnecting any cables, re attaching the cables in new test locations and before recommencing testing repeat the steps.
Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
Page 7 of 8
Job Procedure for Holiday Detection (Using Low/High Voltage)
9.
SAMPLE REPORT FORMAT( Ref: ARIES-AMES-HDT/01 Rev 00)
Doc. Ref.: QHSE/P 11/CNDT/JP09/HD Job Procedure for Holiday Detection | Rev No: 07 | Date: 28 Dec 2017
7
Page 8 of 8
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