PT.
TRANSPORTASI GAS INDONESIA
(1SVC-028315)
DOCUMENT NO:
TGI-FIMS-WP-004-A4
PT BONNE INDOTEKNIK
PAGE 1 OF 5
FACILITY INTEGRITY MANAGEMENT SYSTEM
IMPRESSED CURRENT CATHODIC PROTECTION INSPECTION PROCEDURE
Approved
Approved With Comment
Resubmit For Approval
Reviewed (Not For Approval)
Reviewed With Comment
NOTES:
APPROVAL OF THIS DOCUMENT WILL NOT RELIEVE
CONTRACTOR FROM ITS OBLIGATION TO COMPLETE
ALL THE WORK IN ACCORDANCE WITH THE TERMS AND
CONDITIONS OF THE CONTRACT
TGI-ENG TGI-PA TGI-PM
Etc.
1
B
A 19 AUG 2013 ISSUED FOR REVIEW AN AM DT
Prepared Reviewed Approved
Rev. Date Description
PT BONNE INDOTEKNIK
TABLE OF CONTENT
Page
1. Introduction 3
2. Reference 3
3. Equipment 3
4. Responsibilities 3
5. Procedure. 4
5.1 Cathodic Protection Criteria 4
5.2 Transformer Rectifier (TR) 4
5.3 Junction Box 5
5.4 Test Point 5
2
1. Introduction
The purpose of this inspection is to determine the performance of Impressed
Current Cathodic Protection (ICCP) at PT. TGI Jabung Station facility.
2. Reference
Ref 1 ISO 15589-1 Petroleum and natural gas industries –
CathodicProetction of pipeline transportation systems
– Part 1: On-land pipelines.
Ref 1 NACE TM-0497 Measurement Techniques Related to Criteria of
Cathodic Protection on Underground and Submerged
Piping System
Ref 1 NACE SP-0207 Performing Close-Interval Potential Survey and DC
Surface Potential Gradient Surveys on Buried or
Submerged Metallic Pipelines
Ref 1 NACE SP-0502 Pipeline External Corrosion Direct Assessment
Methodology.
Ref 1 NACE, RP 0286 Electrical isolation of cathodically protected pipelines.
Ref 1 John MORGAN Cathodic Protection
Ref 1 NACE Corrosion Engineer’s Reference Book, Third Edition
Ref 1 NACE Course CP-2 Cathodic Protection Technician Course Manual.
Ref 1 A.W. Peabody Control of Pipeline Corrosion (Houston, TX: NACE,
1967).
3. Equipment
Multimeter (1 m VDC to 40 VDC)
Clamp Amperemeter
Copper-Copper Sulfate reference electrode
High-voltage resistance meter
Current interrupter
Test Wire
Hand Tools
4. Responsibilities
4.1 Corrosion Engineer
Set-up the program of ICCP test
Review the result
4.2 Corrosion Technician
Arrange site works based on program set by Corrosion Engineer
Ensure the instrument is valid for operation
Compile data potential measurement and prepare report to
Corrosion Engineer
Prepare the equipment
Perform ICCP test
3
5. Procedure.
5.1 Cathodic Protection Criteria
NACE Standard Practice SP-0169-2007, address criteria for cathodic protection of
underground pipelines. Applicable excerpts from these criteria, which will be
used during inspection of cathodic protection system, are as follows:
A negative (cathodic ) potential of at least 850 mV with the cathodic
protection applied. This potential is measured with respect to a saturated
copper/ copper sulfate reference electrode contacting the electrolyte.
Voltage drops other than those across the structure-to electrolyte
boundary must be considered for valid interpretation of this voltage
measurement.
A negative polarized potential of at least 850 mV relative to a saturated
copper/ copper sulfate reference electrode.
A minimum of 100 mV of cathodic protection polarization between the
structure surface and stable reference electrode contacting the
electrolyte. The formation or decay of polarization can be measured to
satisfy this criterion.
To avoid detrimental effects on the applied coating by cathodicdisbonding or
hydrogen induced stress cracking on steel, the potential shall not exceed a too
negative potential. This overprotection potential may vary from –1.2 V/Cu-CuSO 4 for
a low carbon steel pipe in an aerated soil to –1.0 V/Cu-CuSO 4 for an high strength
steel pipe.
These values of potential have to be measured as close as possible from the “true”
values, correcting the error due to the ohmic drop in the soil.
5.2 Transformer Rectifier (TR)
Ensure that the transformer rectifier is secured to the bracket mounting and
the enclosure is properly grounded.
Verify that the polarity of the DC circuit is correct, positive terminal to the
anode and negative terminal to the structure.
Verify that proper AC power rating is supplied to the transformer rectifier.
Check that the AC input and DC output terminal is mechanically strong and
electrically conductive.
Adjust the DC output setting to its minimum output.
Ensure that the AC circuit breaker is in off position.
Record the serial no. and model of the transformer rectifier.
Perform a comprehensive check to the input voltage and record the
measurement result
Perform a comprehensive check to all connection, jumper, and fuses
prior energizing the power to this unit
Ensure all components are held tight to the panel
4
Cover the main fuse at input power at MCCB/Switch/ Breaker
Energize the transformer rectifier following the procedure as
mentioned in manual book
Record the DC current and DC voltage resulted
5.3 Junction Box
Ensure that all cable connections are mechanically strong and electrically
conductive.
Ensure that all cables are tagged properly.
Ensure that the boxes are properly grounded.
After Transformer Rectifier is re-energized, check the DC current
output in each Junction Box
Record the DC current output on anode ground bed using DC clamp
meter or from measuring shunt inside Positive Junction Box
Record the DC current output on negative cable using DC clamp meter
or from shunt inside Negative Junction Box
5.4 Test Point
Ensure that all cable connections are mechanically strong and electrically
conductive.
Measured and record the native potential at each test point when
transformer rectifier in off position, prior to re-energizing the cathodic
protection system.
Check pipe-to-soil potential at all Test Point and other accessible location
after cathodic protection system is re-energized
