ARMY UFGS-26 42 14 00 10-2008 CATHODIC PROTECTION SYSTEM (SACRIFICIAL ANODE)《(牺牲阳极的)阴极保护系统》.pdf

1、*USACE / NAVFAC / AFCESA / NASA UFGS-26 42 14.00 10 (August 2008)-Preparing Activity: USACE SupersedingUFGS-26 42 14 00 10 (November 2006)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated July 2009*SECTION TABLE OF CONTENTSDIVISION 26 - ELECTRICALSECTION 26 42 14.00

2、10CATHODIC PROTECTION SYSTEM (SACRIFICIAL ANODE)08/09PART 1 GENERAL1.1 REFERENCES1.2 SYSTEM DESCRIPTION1.2.1 Contractors Modifications1.2.2 Summary of Services Required1.2.3 Tests of Components1.2.4 Electrical Potential Measurements1.2.5 Achievement of Criteria for Protection1.2.6 Metallic Component

3、s on Nonmetallic Systems and Typicals1.2.7 Metallic Component Coating1.3 SUBMITTALS1.4 QUALITY ASSURANCE1.4.1 Services of “Corrosion Expert“1.4.2 Isolators1.4.3 Anode and Bond Wires1.4.4 Surge Protection1.4.5 Nonmetallic Pipe System1.4.5.1 Coatings1.4.5.2 Tracer Wire1.4.6 Drawings1.5 DELIVERY, STORA

4、GE, AND HANDLING1.6 EXTRA MATERIALSPART 2 PRODUCTS2.1 MAGNESIUM ANODES2.1.1 Anode Composition2.1.2 Dimensions and Weights2.1.3 Packaged Anodes2.1.4 Zinc Anodes2.1.5 Connecting Wire2.1.5.1 Wire Requirements2.1.5.2 Anode Header Cable2.2 MISCELLANEOUS MATERIALS2.2.1 Electrical WireSECTION 26 42 14.00 1

5、0 Page 1Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2.2.1.1 Wire Splicing2.2.1.2 Test Wires2.2.1.3 Resistance Wire2.2.2 Conduit2.2.3 Test Boxes and Junctions Boxes2.2.4 Joint, Patch, Seal, and Repair Coating2.2.5 Backfill Shields2.2.6 Epoxy Potti

6、ng Compound2.2.7 Test Stations2.2.8 Joint and Continuity Bonds2.2.9 Resistance Bonds2.2.10 Stray Current Measurements2.2.11 Electrical Isolation of Structures2.2.11.1 Electrically Isolating Pipe Joints2.2.11.2 Electrically Conductive Couplings2.2.11.3 Insulating Joint Testing2.2.12 Underground Struc

7、ture Coating2.2.12.1 Field Joints2.2.12.2 Inspection of Pipe Coatings2.2.13 Resistance Wire2.2.14 Electrical Connections2.2.15 Electrical Tape2.2.16 Permanent Reference Electrodes2.2.17 CasingPART 3 EXECUTION3.1 CRITERIA OF PROTECTION3.1.1 Iron and Steel3.1.2 Aluminum3.1.3 Copper Piping3.2 TRENCHING

8、 AND BACKFILLING3.3 INSTALLATION3.3.1 Anode Installation3.3.1.1 Single Anodes3.3.1.2 Groups of Anodes3.3.1.3 Welding Methods3.3.2 Anode Placement - General3.3.3 Underground Pipeline3.3.4 Installation Details3.3.5 Lead Wire Connections3.3.5.1 Underground Pipeline (Metallic)3.3.5.2 Resistance Wire Spl

9、ices3.3.6 Location of Test Stations3.3.7 Underground Pipe Joint Bonds3.4 ELECTRICAL ISOLATION OF STRUCTURES3.4.1 Isolation Joints and Fittings3.4.2 Gas Distribution Piping3.5 TESTS AND MEASUREMENTS3.5.1 Baseline Potentials3.5.2 Isolation Testing3.5.2.1 Insulation Checker3.5.2.2 Cathodic Protection M

10、eter3.5.3 Anode Output3.5.4 Reference Electrode Potential Measurements3.5.5 Location of Measurements3.5.5.1 Piping or Conduit3.5.5.2 Tanks3.5.5.3 Casing TestsSECTION 26 42 14.00 10 Page 2Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.5.5.4 Interfe

11、rence Testing3.5.5.5 Holiday Test3.5.5.6 Recording Measurements3.6 TRAINING COURSE3.7 SYSTEM TESTING3.8 SEEDING3.9 CLEANUP- End of Section Table of Contents -SECTION 26 42 14.00 10 Page 3Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-*USACE / NAVFAC

12、 / AFCESA / NASA UFGS-26 42 14.00 10 (August 2008)-Preparing Activity: USACE SupersedingUFGS-26 42 14 00 10 (November 2006)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated July 2009*SECTION 26 42 14.00 10CATHODIC PROTECTION SYSTEM (SACRIFICIAL ANODE)08/09*NOTE: This

13、 guide specification covers the requirements for a cathodic protection system utilizing continuous flow direct current from sacrificial anodes.Edit this guide specification for project specific requirements by adding, deleting, or revising text. For bracketed items, choose applicable items(s) or ins

14、ert appropriate information.Remove information and requirements not required in respective project, whether or not brackets are present.Comments and suggestions on this guide specification are welcome and should be directed to the technical proponent of the specification. A listing of technical prop

15、onents, including their organization designation and telephone number, is on the Internet.Recommended changes to a UFGS should be submitted as a Criteria Change Request (CCR).*PART 1 GENERAL*NOTE: This specification covers a cathodic protection system for metal surfaces against corrosion by producin

16、g a continuous flow of direct current from sacrificial anodes to the metal to be protected. The anodes should be of sufficient size and quantity to protect the buried metal items for a specified number of years before replacement. The U.S. Department of Transportation has issued regulations requirin

17、g the application of cathodic protection to natural gas pipelines, liquid natural gas pipelines, petroleum pipelines, petroleum products pipelines, liquid petroleum gas pipelines, and petroleum storage facilities. Title 49 of the SECTION 26 42 14.00 10 Page 4Provided by IHSNot for ResaleNo reproduct

18、ion or networking permitted without license from IHS-,-,-Code of Federal Regulations, Parts 191, 192, 193 and 195 should be consulted for applicable cathodic protection requirements for specific applications.*1.1 REFERENCES*NOTE: This paragraph is used to list the publications cited in the text of t

19、he guide specification. The publications are referred to in the text by basic designation only and listed in this paragraph by organization, designation, date, and title.Use the Reference Wizards Check Reference feature when you add a RID outside of the Sections Reference Article to automatically pl

20、ace the reference in the Reference Article. Also use the Reference Wizards Check Reference feature to update the issue dates.References not used in the text will automatically be deleted from this section of the project specification when you choose to reconcile references in the publish print proce

21、ss.*The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.ASTM INTERNATIONAL (ASTM)ASTM B 418 (2008) Standard Specification for Cast and Wrought Galvanic Zinc AnodesASTM B 843 (2007) St

22、andard Specification for Magnesium Alloy Anodes for Cathodic ProtectionASTM D 1248 (2005) Standard Specification for Polyethylene Plastics Extrusion Materials for Wire and CableNACE INTERNATIONAL (NACE)NACE RP0193 (2001) External Cathodic Protection of On-Grade Carbon Steel Storage Tank BottomsNACE

23、RP0285 (2002) Corrosion Control of Underground Storage Tank Systems by Cathodic ProtectionNACE SP0169 (2007) Control of External Corrosion on Underground or Submerged Metallic Piping SystemsNACE SP0177 (2007) Mitigation of Alternating Current and Lightning Effects on Metallic SECTION 26 42 14.00 10

24、Page 5Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Structures and Corrosion Control SystemsNACE SP0188 (2006) Discontinuity (Holiday) Testing of New Protective Coatings on Conductive SubstratesNATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)NE

25、MA TC 2 (2003) Standard for Electrical Polyvinyl Chloride (PVC) Tubing and ConduitNATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 70 (2008; AMD 1 2008) National Electrical Code - 2008 EditionU.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)40 CFR 280 Technical Standards and Corrective Action

26、Requirements for Owners and Operators of Underground Storage Tanks (UST)49 CFR 192 Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards49 CFR 195 Transportation of Hazardous Liquids by PipelineUNDERWRITERS LABORATORIES (UL)UL 510 (2005; Rev thru Aug 2005) Polyvinyl C

27、hloride, Polyethylene, and Rubber Insulating TapeUL 514A (2004; Rev thru Aug 2007) Standard for Metallic Outlet BoxesUL 6 (2007) Standard for Electrical Rigid Metal Conduit-Steel1.2 SYSTEM DESCRIPTIONProvide a complete, operating, sacrificial anode cathodic protection system in complete compliance w

28、ith NFPA 70, with all applicable Federal, State, and local regulations and with the minimum requirements of this contract. In addition to the minimum requirements of these specifications, construction of gas pipelines and associated cathodic protection systems shall be in compliance with 49 CFR 192

29、and construction of hazardous liquid pipelines, including fuel pipelines, and associated cathodic protection systems shall be in compliance with 49 CFR 195 and construction and installation of underground fuel storage tanks and associated cathodic protection system shall be in compliance with 40 CFR

30、 280. The services required include planning, installation, adjusting and testing of a cathodic protection system, using sacrificial anodes for cathodic protection of the Water Fire Protection Force Main Gas _ lines, their connectors and lines under the slab or floor foundation. The cathodic protect

31、ion system shall include anodes, cables, connectors, corrosion protection test stations, and any other equipment required for a complete operating system providing the NACE criteria of SECTION 26 42 14.00 10 Page 6Provided by IHSNot for ResaleNo reproduction or networking permitted without license f

32、rom IHS-,-,-protection as specified. Insulators are required whenever needed to insulate the pipes from any other structure. Any pipe crossing the _ pipe shall have a test station. The cathodic protection shall be provided on Water Fire Protection Force Main Gas _ pipes.1.2.1 Contractors Modificatio

33、nsThe specified system is based on a complete system with magnesium sacrificial anodes. The Contractor may modify the cathodic protection system after review of the project, site verification, and analysis, if the proposed modifications include the anodes specified and will provide better overall sy

34、stem performance. The modifications shall be fully described, shall be approved by the Contracting Officers representative, and shall meet the following criteria. The proposed system shall achieve a minimum pipe-to-soil “instant off“ potential of minus 850 millivolts with reference to a saturated co

35、pper-copper sulfate reference cell on the underground components of the piping or other metallic surface. Take resistivity measurements of the soil in the vicinity of the pipes and ground bed sites. Based upon the measurements taken, the current and voltage shall be required to produce a minimum of

36、minus 850 millivolts “instant off“ potential between the structure being tested and the reference cell. This potential shall be obtained over 95 percent of the metallic area. The anode system shall be designed for a life of twenty-five (25) years of continuous operation.1.2.2 Summary of Services Req

37、uiredThe scope of services shall include, but shall not be limited to, the following:a. Close-interval potential surveys.b. Cathodic Protection Systems.c. System testing.d. Casing corrosion control.e. Interference testing.f. Training.g. Operating and maintenance manual.h. Insulator testing and bondi

38、ng testing.i. Coating and holiday testing to be submitted within 45 days of notice to proceed.1.2.3 Tests of ComponentsPerform a minimum of four (4) tests at each metallic component in the piping system. Two (2) measurements shall be made directly over the anodes and the other two (2) tests shall be

39、 over the outer edge of the component, but at the farthest point from the anodes. Structure and pipes shall be shown with the cathodic protection equipment. All components of the cathodic protection system shall be shown on drawings, showing their relationship to the protected structure or component

40、. A narrative shall describe how the cathodic protection system will work and provide testing SECTION 26 42 14.00 10 Page 7Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-at each component. Components requiring cathodic protection shall include but n

41、ot be limited to the following:a. Pipes under the floor slab or foundations.b. PIV.c. Shutoff valves.d. Metallic pipe extended from aboveground locations.e. Each connector or change-of-direction device.f. Any metallic pipe component or section.g. Backflow preventor.h. Culvert.1.2.4 Electrical Potent

42、ial MeasurementsAll potential tests shall be made at a minimum of 3 m 10 foot intervals witnessed by the Contracting Officer. Submittals shall identify test locations on separate drawing, showing all metal to be protected and all cathodic protection equipment. Test points equipment and protected met

43、al shall be easily distinguished and identified.1.2.5 Achievement of Criteria for ProtectionAll conductors, unless otherwise shown, shall be routed to or through the test stations. Each system provided shall achieve a minimum pipe-to-soil “instant off“ potential of minus 850 millivolt potentials wit

44、h reference to a saturated copper-copper-sulfate reference cell on all underground components of the piping. Based upon the measurements taken, the current and voltage of the anodes should be adjusted as required to produce a minimum of minus 850 millivolts “instant off“ potential between the struct

45、ure being tested and the reference cell. This potential should be obtained over 95 percent of the metallic area. This must be achieved without the “instant off“ potential exceeding 1150 millivolts. Testing will be witnessed by the Contracting Officer. Provide additional anodes if required to achieve

46、 the minus 850 millivolts “instant off“. Although acceptance criteria of the cathodic protection systems are defined in NACE SP0169, for this project the “instant off“ potential of minus 850 millivolts is the only acceptable criteria.1.2.6 Metallic Components on Nonmetallic Systems and Typicalsa. Metallic components: