NACE SP 01 69 : 2013
Superseded
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
CONTROL OF EXTERNAL CORROSION ON UNDERGROUND OR SUBMERGED METALLIC PIPING SYSTEMS
Available format(s)
Hardcopy , PDF
Superseded date
29-06-2024
Superseded by
Language(s)
English
Published date
04-10-2013
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1. General
2. Definitions, Abbreviations, and Acronyms
3. Determination of Need for External Corrosion Control
4. Piping System Design
5. External Coatings
6. Criteria and Other Considerations for Cathodic Protection
7. Design of Cathodic Protection Systems
8. Installation of CP Systems
9. Control of Stray Currents
10. Operation and Maintenance of CP Systems
11. External Corrosion Control Records
References
Bibliography
Appendix A: External Coatings Tables
Appendix B: Review of International Standards
Gives accepted methods and practices for the control of external corrosion on buried or submerged steel, stainless steel, cast iron, ductile iron, copper, and aluminum piping systems.
| Committee |
STG 35
|
| DevelopmentNote |
Supersedes and redesignates NACE RP 01 69. (06/2007) To be used in conjunction with NACE SP 05 72, NACE SP 01 77, NACE SP 02 85, NACE SP 02 86, NACE SP 01 88, NACE TPC 11 and NACE TM 04 97. (12/2013)
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| DocumentType |
Standard
|
| ISBN |
1-57590-035-1
|
| Pages |
60
|
| PublisherName |
National Association of Corrosion Engineers
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
| API 1160 : 2013 | MANAGING SYSTEM INTEGRITY FOR HAZARDOUS LIQUID PIPELINES |
| 15/30275410 DC : 0 | BS EN ISO 16530-1 - PETROLEUM AND NATURAL GAS INDUSTRIES - WELL INTEGRITY - PART 1: LIFE CYCLE GOVERNANCE |
| NACE SP 01 09 : 2009 | FIELD APPLICATION OF BONDED TAPE COATINGS FOR EXTERNAL REPAIR, REHABILITATION, AND WELD JOINTS ON BURIED METAL PIPELINES |
| Z276-18 | Liquefied natural gas (LNG) - Production, storage, and handling |
| NACE SP 01 00 : 2014 | CATHODIC PROTECTION TO CONTROL EXTERNAL CORROSION OF CONCRETE PRESSURE PIPELINES AND MORTAR-COATED STEEL PIPELINES FOR WATER OR WASTE WATER SERVICE |
| NFPA 30A : 2018 | MOTOR FUEL DISPENSING FACILITIES AND REPAIR GARAGES |
| NFPA 30 : 2018 | FLAMMABLE AND COMBUSTIBLE LIQUIDS CODE |
| NFPA 54 : 2018 | NATIONAL FUEL GAS CODE |
| NFPA 59 : 2018 | UTILITY LP-GAS PLANT CODE |
| NACE 35108 : 0 | ONE HUNDRED MILLIVOLT (MV) CATHODIC POLARIZATION CRITERION |
| CEN ISO/TS 16530-2:2015 | Well integrity - Part 2: Well integrity for the operational phase (ISO/TS 16530-2:2014) |
| NACE SP 01 76 : 2007 | CORROSION CONTROL OF SUBMERGED AREAS OF PERMANENTLY INSTALLED STEEL OFFSHORE STRUCTURES ASSOCIATED WITH PETROLEUM PRODUCTION |
| ANSI Z223.1 : 2018 | NATIONAL FUEL GAS CODE |
| NACE SP0113:2023 | Pipeline Integrity Management: Methods Selection and Implementation |
| NACE SP0200:2023 | Steel-Cased Pipeline Practices |
| ASME PTB 2 : 2009 | GUIDE TO LIFE CYCLE MANAGEMENT OF PRESSURE EQUIPMENT INTEGRITY |
| NACE SP 05 02 : 2010 | PIPELINE EXTERNAL CORROSION DIRECT ASSESSMENT METHODOLOGY |
| I.S. EN ISO 16440:2016 | PETROLEUM AND NATURAL GAS INDUSTRIES - PIPELINE TRANSPORTATION SYSTEMS - DESIGN, CONSTRUCTION AND MAINTENANCE OF STEEL CASED PIPELINES (ISO 16440:2016) |
| NACE TM 04 97 : 2012 | MEASUREMENT TECHNIQUES RELATED TO CRITERIA FOR CATHODIC PROTECTION ON UNDERGROUND OR SUBMERGED METALLIC PIPING SYSTEMS |
| API 581 REDLINE : 2008 | RISK-BASED INSPECTION TECHNOLOGY |
| NACE SP 02 86 : 2007 | ELECTRICAL ISOLATION OF CATHODICALLY PROTECTED PIPELINES |
| I.S. EN ISO 16530-1:2017 | PETROLEUM AND NATURAL GAS INDUSTRIES - WELL INTEGRITY - PART 1: LIFE CYCLE GOVERNANCE (ISO 16530-1:2017) |
| NACE SP 05 72 : 2007 | DESIGN, INSTALLATION, OPERATION, AND MAINTENANCE OF IMPRESSED CURRENT DEEP ANODE BEDS |
| NFPA 59A : 2016 | PRODUCTION, STORAGE, AND HANDLING OF LIQUEFIED NATURAL GAS (LNG) |
| NFPA 58 : 2017 | LIQUEFIED PETROLEUM GAS CODE |
| NFPA 52 : 2016 | VEHICULAR NATURAL GAS FUEL SYSTEMS CODE |
| NACE SP 02 85 : 2011 | “Corrosion Control of Underground Storage Tank Systems by Cathodic Protection” |
| NFPA 1 : 2021 | FIRE CODE |
| ASME B31-8S:2022 | Managing System Integrity of Gas Pipelines |
| ASME B31.8S : 2016 | MANAGING SYSTEM INTEGRITY OF GAS PIPELINES |
| ASME B31.4 : 2016 | PIPELINE TRANSPORTATION SYSTEMS FOR LIQUIDS AND SLURRIES |
| UFC 3-460-01 : Change 3 | UNIFIED FACILITIES CRITERIA - DESIGN: PETROLEUM FUEL FACILITIES |
| ASME B31.8 : 2016 | Gas Transmission and Distribution Piping Systems |
| 14/30265038 DC : 0 | BS EN ISO 16440 - PETROLEUM AND NATURAL GAS INDUSTRIES - PIPELINE TRANSPORTATION SYSTEMS - DESIGN, CONSTRUCTION AND MAINTENANCE OF STEEL CASED PIPELINES |
| BS EN ISO 16530-1:2017 | Petroleum and natural gas industries. Well integrity Life cycle governance |
| NACE SP 02 00 : 2014 | STEEL-CASED PIPELINE PRACTICES |
| NACE SP21424 : 2018 | ALTERNATING CURRENT CORROSION ON CATHODICALLY PROTECTED PIPELINES: RISK ASSESSMENT, MITIGATION, AND MONITORING |
| API RP 2611 : 2011 | TERMINAL PIPING INSPECTION - INSPECTION OF IN-SERVICE TERMINAL PIPING SYSTEMS |
| NACE SP 05 07 : 2014 | EXTERNAL CORROSION DIRECT ASSESSMENT (ECDA) INTEGRITY DATA EXCHANGE (IDX) |
| S.R. CEN ISO/TS 16530-2:2015 | WELL INTEGRITY - PART 2: WELL INTEGRITY FOR THE OPERATIONAL PHASE (ISO/TS 16530-2:2014) |
| NACE 01102 : 0 | STATE-OF-THE-ART REPORT: CRITERIA FOR CATHODIC PROTECTION OF PRESTRESSED CONCRETE STRUCTURES |
| ISO 15257:2017 | Cathodic protection — Competence levels of cathodic protection persons — Basis for a certification scheme |
| CSA B139 : 2015 | INSTALLATION CODE FOR OIL-BURNING EQUIPMENT |
| EN ISO 16530-1:2017 | Petroleum and natural gas industries - Well integrity - Part 1: Life cycle governance (ISO 16530-1:2017) |
| DIN EN ISO 16440:2017-07 | PETROLEUM AND NATURAL GAS INDUSTRIES - PIPELINE TRANSPORTATION SYSTEMS - DESIGN, CONSTRUCTION AND MAINTENANCE OF STEEL CASED PIPELINES (ISO 16440:2016) |
| DIN EN ISO 15257:2016-06 (Draft) | CATHODIC PROTECTION - COMPETENCE LEVELS OF CATHODIC PROTECTION PERSONS - BASIS FOR A CERTIFICATION SCHEME (ISO 15257:2017) |
| 14/30271613 DC : 0 | BS ISO 15257 - CATHODIC PROTECTION - COMPETENCE LEVELS OF CATHODIC PROTECTION PERSONS - BASIS FOR CERTIFICATION SCHEME |
| CSA C448 SERIES : 2016 | DESIGN AND INSTALLATION OF GROUND SOURCE HEAT PUMP SYSTEMS FOR COMMERCIAL AND RESIDENTIAL BUILDINGS |
| API 570 : 2016 | PIPING INSPECTION CODE: IN-SERVICE INSPECTION, RATING, REPAIR, AND ALTERATION OF PIPING SYSTEMS |
| AWWA M41 : 3 | Ductile-Iron Pipe and Fittings, Third Edition |
| BS EN ISO 16440:2016 | Petroleum and natural gas industries. Pipeline transportation systems. Design, construction and maintenance of steel cased pipelines |
| DIN CEN ISO/TS 16530-2;DIN SPEC 91087:2016-05 | WELL INTEGRITY - PART 2: WELL INTEGRITY FOR THE OPERATIONAL PHASE (ISO/TS 16530-2:2014) |
| NACE SP 02 15 : 2015 | BELOW-GRADE CORROSION CONTROL OF TRANSMISSION, DISTRIBUTION, AND SUBSTATION STRUCTURES BY COATING REPAIR SYSTEMS |
| API RP 1176 : 2016 | RECOMMENDED PRACTICE FOR ASSESSMENT AND MANAGEMENT OF CRACKING IN PIPELINES |
| NACE 05107 : 0 | REPORT ON CORROSION PROBES IN SOIL OR CONCRETE |
| ISO 16530-1:2017 | Petroleum and natural gas industries — Well integrity — Part 1: Life cycle governance |
| ISO 16440:2016 | Petroleum and natural gas industries — Pipeline transportation systems — Design, construction and maintenance of steel cased pipelines |
| EN ISO 16440:2016 | Petroleum and natural gas industries - Pipeline transportation systems - Design, construction and maintenance of steel cased pipelines (ISO 16440:2016) |
| EN ISO 15257:2017 | Cathodic protection - Competence levels of cathodic protection persons - Basis for certification scheme (ISO 15257:2017) |
| ABS 0243 : 2017 | GUIDANCE NOTES ON SUBSEA HYBRID RISER SYSTEMS |
| NACE SP 01 04 : 2014 | THE USE OF COUPONS FOR CATHODIC PROTECTION MONITORING APPLICATIONS |
| BS EN ISO 15257:2017 | Cathodic protection. Competence levels of cathodic protection persons Basis for certification scheme |
| NACE SP 02 07 : 2007 | PERFORMING CLOSE-INTERVAL POTENTIAL SURVEYS AND DC SURFACE POTENTIAL GRADIENT SURVEYS ON BURIED OR SUBMERGED METALLIC PIPELINES |
| API RP 1177 : 2017 | RECOMMENDED PRACTICE FOR STEEL PIPELINE CONSTRUCTION QUALITY MANAGEMENT SYSTEMS |
| API BULL 1178 : 2017 | INTEGRITY DATA MANAGEMENT AND INTEGRATION |
| AWWA M28 : 2014 | REHABILITATION OF WATER MAINS |
| PD CEN ISO/TS 16530-2:2015 | Well integrity Well integrity for the operational phase |
| UFC 3-570-01 : 2016 | UNIFIED FACILITIES CRITERIA (UFC) - CATHODIC PROTECTION |
| API 574 : 2016 | INSPECTION PRACTICES FOR PIPING SYSTEM COMPONENTS |
| IEEE 1839-2014 | NACE International and IEEE Joint Standard Practice for Below-Grade Corrosion Control of Transmission, Distribution, and Substation Structures by Coating Repair Systems |
| I.S. EN ISO 15257:2017 | CATHODIC PROTECTION - COMPETENCE LEVELS OF CATHODIC PROTECTION PERSONS - BASIS FOR CERTIFICATION SCHEME (ISO 15257:2017) |
| NACE SP 01 85 : 2007 | EXTRUDED POLYOLEFIN RESIN COATING SYSTEMS WITH SOFT ADHESIVES FOR UNDERGROUND OR SUBMERGED PIPE |
| NACE SP 01 86 : 2007 | APPLICATION OF CATHODIC PROTECTION FOR EXTERNAL SURFACES OF STEEL WELL CASINGS |
| NFPA 1 : 2018 | FIRE CODE |
| NACE SP 02 85 : 2011 | “Corrosion Control of Underground Storage Tank Systems by Cathodic Protection” |
| NACE TM 01 02 : 2002 | MEASUREMENT OF PROTECTIVE COATING ELECTRICAL CONDUCTANCE ON UNDERGROUND PIPELINES |
| NACE TM 01 09 : 2009 | ABOVEGROUND SURVEY TECHNIQUES FOR THE EVALUATION OF UNDERGROUND PIPELINE COATING CONDITION |
| NACE SP 01 02 : 2017 | IN-LINE INSPECTION OF PIPELINES |
| AWWA C222 : 2008 | POLYURETHANE COATINGS AND LININGS FOR STEEL WATER PIPE AND FITTINGS |
| NACE SP 01 88 : 2006 | DISCONTINUITY (HOLIDAY) TESTING OF NEW PROTECTIVE COATINGS ON CONDUCTIVE SUBSTRATES |
| NACE 35108 : 0 | ONE HUNDRED MILLIVOLT (MV) CATHODIC POLARIZATION CRITERION |
| NACE SP 01 09 : 2009 | FIELD APPLICATION OF BONDED TAPE COATINGS FOR EXTERNAL REPAIR, REHABILITATION, AND WELD JOINTS ON BURIED METAL PIPELINES |
| NACE 10A292 : 2013 | CORROSION AND CORROSION CONTROL FOR BURIED CAST- AND DUCTILE-IRON PIPE |
| ASTM G 8 : 1996 | Standard Test Methods for Cathodic Disbonding of Pipeline Coatings |
| AWWA C209 : 2013 | COLD-APPLIED TAPE COATINGS FOR STEEL WATER PIPE, SPECIAL SECTIONS, CONNECTIONS, AND FITTINGS |
| ANSI/AWWA C216 : 2015 | HEAT-SHRINKABLE CROSS-LINKED POLYOLEFIN COATINGS FOR STEEL WATER PIPE AND FITTINGS |
| ASTM G 21 : 2015 : REDLINE | Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi |
| AWWA C215 : 2016 | EXTRUDED POLYOLEFIN COATINGS FOR STEEL WATER PIPE |
| NFA 49 710 : 1988 | STEEL TUBES - EXTERNAL COATING WITH THREE POLYETHYLENE BASED COATING - APPLICATION THROUGH EXTRUSION |
| AS 2832.1:2015 | Cathodic protection of metals Pipes and cables |
| SSPC-PAINT 33 : 2006 | COAL TAR MASTIC, COLD-APPLIED |
| ASTM D 543 : 2014 : REDLINE | Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents |
| ASME B31.8 : 2016 | Gas Transmission and Distribution Piping Systems |
| NACE SP 01 85 : 2007 | EXTRUDED POLYOLEFIN RESIN COATING SYSTEMS WITH SOFT ADHESIVES FOR UNDERGROUND OR SUBMERGED PIPE |
| DIN 50928:1985-09 | CORROSION OF METALS, TESTING AND ASSESSMENT OF THE CORROSION PROTECTION OF COATED METALLIC MATERIALS IN CONTACT WITH AQUEOUS CORROSIVE AGENTS |
| NACE SP 02 86 : 2007 | ELECTRICAL ISOLATION OF CATHODICALLY PROTECTED PIPELINES |
| AS 4352-2005 | Tests for coating resistance to cathodic disbonding |
| NACE RP 04 02 : 2002 | FIELD-APPLIED FUSION-BONDED EPOXY (FBE) PIPE COATING SYSTEMS FOR GIRTH WELD JOINTS: APPLICATION, PERFORMANCE, AND QUALITY CONTROL |
| AWWA C214 : 2014 | TAPE COATINGS FOR STEEL WATER PIPE |
| NACE 35103 : 0 | EXTERNAL STRESS CORROSION CRACKING OF UNDERGROUND PIPELINES |
| ASME B31.4 : 2016 | PIPELINE TRANSPORTATION SYSTEMS FOR LIQUIDS AND SLURRIES |
| ANSI/AWWA C213 : 2015 | FUSION-BONDED EPOXY COATINGS AND LININGS FOR STEEL WATER PIPE AND FITTINGS |
| NACE SP 01 76 : 2007 | CORROSION CONTROL OF SUBMERGED AREAS OF PERMANENTLY INSTALLED STEEL OFFSHORE STRUCTURES ASSOCIATED WITH PETROLEUM PRODUCTION |
| CSA Z245.20-Z245.21 : 2006 | EXTERNAL FUSION BOND EPOXY COATING FOR STEEL PIPE/EXTERNAL POLYETHYLENE COATING FOR PIPE |
| BS EN 12954:2001 | Cathodic protection of buried or immersed metallic structures. General principles and application for pipelines |
| NACE 10A392 : 2006 | EFFECTIVENESS OF CATHODIC PROTECTION ON THERMALLY INSULATED UNDERGROUND METALLIC STRUCTURES |
| ASTM D 427 : 2004 | Test Method for Shrinkage Factors of Soils by the Mercury Method (Withdrawn 2008) |
| NACE RP 03 94 : 2002 | APPLICATION, PERFORMANCE, AND QUALITY CONTROL OF PLANT-APPLIED, FUSION-BONDED EPOXY EXTERNAL PIPE COATING |
| NACE SP 02 04 : 2015 | STRESS CORROSION CRACKING (SCC) DIRECT ASSESSMENT METHODOLOGY |
| ASTM D 2197 : 2016 : REDLINE | Standard Test Method for Adhesion of Organic Coatings by Scrape Adhesion |
| FED-STD-406 Revision A:1982 | PLASTIC, METHODS OF TESTING |
| NACE RP 03 75 : 2006 | FIELD-APPLIED UNDERGROUND WAX COATING SYSTEMS FOR UNDERGROUND PIPELINES: APPLICATION, PERFORMANCE, AND QUALITY CONTROL |
| NACE RP 06 02 : 2002 | FIELD-APPLIED COAL TAR ENAMEL PIPE COATING SYSTEMS: APPLICATION, PERFORMANCE, AND QUALITY CONTROL |
| NACE RP 01 04 : 2004 | THE USE OF COUPONS FOR CATHODIC PROTECTION MONITORING APPLICATIONS |
| NACE SP 06 07 : 2007 | PETROLEUM AND NATURAL GAS INDUSTRIES - CATHODIC PROTECTION OF PIPELINE |
| ISO 15589-1:2015 | Petroleum, petrochemical and natural gas industries — Cathodic protection of pipeline systems — Part 1: On-land pipelines |
| NACE 10B189 : 2014 | DIRECT CURRENT OPERATED RAIL TRANSIT STRAY CURRENT MITIGATION |
| NACE RP 01 05 : 2005 | LIQUID-EPOXY COATINGS FOR EXTERNAL REPAIR, REHABILITATION, AND WELD JOINTS ON BURIED STEEL PIPELINES |
| NACE TPC 11 : 2008 | A GUIDE TO THE ORGANIZATION OF UNDERGROUND CORROSION-CONTROL COORDINATING COMMITTEES |
| AWWA C225 : 2014 | FUSED POLYOLEFIN COATINGS FOR STEEL WATER PIPE |
| NACE TM 04 97 : 2012 | MEASUREMENT TECHNIQUES RELATED TO CRITERIA FOR CATHODIC PROTECTION ON UNDERGROUND OR SUBMERGED METALLIC PIPING SYSTEMS |
| NACE RP 03 03 : 2003 | FIELD-APPLIED HEAT-SHRINKABLE SLEEVES FOR PIPELINES: APPLICATION, PERFORMANCE, AND QUALITY CONTROL |
| BS EN 14628:2005 | Ductile iron pipes, fittings and accessories. External polythene coating for pipes. Requirements and test methods |
| NACE SP 05 72 : 2007 | DESIGN, INSTALLATION, OPERATION, AND MAINTENANCE OF IMPRESSED CURRENT DEEP ANODE BEDS |
| DIN VDE 0150 : 1983 | PROTECTION AGAINST CORROSION DUE TO STRAY CURRENTS OF D.C. INSTALLATION |
| ASTM G 42 : 2011 : REDLINE | TEST METHOD FOR CATHODIC DISBONDING OF PIPELINE COATINGS SUBJECTED TO ELEVATED TEMPERATURES |
| EN 12068:1998 | Cold-rolled flat products made of high yield strength micro-alloyed steels for cold forming - General delivery conditions |
| ISO 15589-2:2012 | Petroleum, petrochemical and natural gas industries — Cathodic protection of pipeline transportation systems — Part 2: Offshore pipelines |
| DIN 50918:1978-06 | CORROSION OF METALS; ELECTROCHEMICAL CORROSION TESTS |
| NACE SP 02 07 : 2007 | PERFORMING CLOSE-INTERVAL POTENTIAL SURVEYS AND DC SURFACE POTENTIAL GRADIENT SURVEYS ON BURIED OR SUBMERGED METALLIC PIPELINES |
| EN ISO 14919:2015 | Thermal spraying - Wires, rods and cords for flame and arc spraying - Classification - Technical supply conditions (ISO 14919:2015) |
| ISO 8179:1985 | Ductile iron pipes External zinc coating |
| GOST R 51164 : 1998 | STEEL PIPE MAINS - GENERAL REQUIREMENTS FOR CORROSION PROTECTION |
| NACE SP 02 74 : 2011 | HIGH-VOLTAGE ELECTRICAL INSPECTION OF PIPELINE COATINGS |
| CFR 49(PTS178-199) : OCT 2017 | TRANSPORTATION |
| ASTM D 2304 : 2010-10 | TEST METHOD FOR THERMAL ENDURANCE OF RIGID ELECTRICAL INSULATING MATERIALS |
| AWWA C203 : 2015 | COAL-TAR PROTECTIVE COATINGS AND LININGS FOR STEEL WATER PIPE |
| NACE 35110 : 0 | AC CORROSION STATE-OF-THE-ART: CORROSION RATE, MECHANISM, AND MITIGATION REQUIREMENTS |
| NACE RP 03 99 : 2004 | PLANT-APPLIED EXTERNAL COAL TAR ENAMEL PIPE COATING SYSTEMS: APPLICATION, PERFORMANCE, AND QUALITY CONTROL |
| AWWA C217 : 2016 | MICROCRYSTALLINE WAX AND PETROLATUM TAPE COATING SYSTEMS FOR STEEL WATER PIPE AND FITTINGS |
| ASTM D 2454 : 2014-03 | PRACTICE FOR DETERMINING THE EFFECT OF OVERBAKING ON ORGANIC COATINGS |
| NACE SP 01 77 : 2014 | MITIGATION OF ALTERNATING CURRENT AND LIGHTNING EFFECTS ON METALLIC STRUCTURES AND CORROSION CONTROL SYSTEMS |
| BS EN 545:2010 | Ductile iron pipes, fittings, accessories and their joints for water pipelines. Requirements and test methods |
| NACE SP 02 00 : 2014 | STEEL-CASED PIPELINE PRACTICES |
| DIN EN 15542:2008-06 | Ductile iron pipes, fittings and accessories - External cement mortar coating for pipes - Requirements and test methods |
| CSA Z245.20 SERIES : 2014 | PLANT-APPLIED EXTERNAL COATINGS FOR STEEL PIPE |
| ASTM G 19 : 2004 | Standard Test Method for Disbonding Characteristics of Pipeline Coatings by Direct Soil Burial (Withdrawn 2010) |
| AWWA C210 : 2015 | LIQUID-EPOXY COATINGS AND LININGS FOR STEEL WATER PIPE AND FITTINGS |
| DIN 50927:1985-08 | PLANNING AND APPLICATION OF ELECTROCHEMICAL CORROSION PROTECTION OF INTERNAL SURFACES OF APPARATUS, CONTAINERS AND TUBES (INTERNAL PROTECTION) |
| NACE SP 04 90 : 2007 | HOLIDAY DETECTION OF FUSION-BONDED EPOXY EXTERNAL PIPELINE COATINGS OF 250 TO 760 MICROM (10 TO 30 MIL) |
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