1、 Standard Recommended Practice Liquid-Epoxy Coatings for External Repair, Rehabilitation, and Weld Joints on Buried Steel Pipelines This NACE International (NACE) standard represents a consensus of those individual members who have reviewed this document, its scope, and provisions. Its acceptance do
2、es not in any respect preclude anyone, whether he has adopted the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not in conformance with this standard. Nothing contained in this NACE standard is to be construed as granting any right, by implic
3、ation or otherwise, to manufacture, sell, or use in connection with any method, apparatus, or product covered by Letters Patent, or as indemnifying or protecting anyone against liability for infringement of Letters Patent. This standard represents minimum requirements and should in no way be interpr
4、eted as a restriction on the use of better procedures or materials. Neither is this standard intended to apply in all cases relating to the subject. Unpredictable circumstances may negate the usefulness of this standard in specific instances. NACE assumes no responsibility for the interpretation or
5、use of this standard by other parties and accepts responsibility for only those official NACE interpretations issued by NACE in accordance with its governing procedures and policies which preclude the issuance of interpretations by individual volunteers. Users of this NACE standard are responsible f
6、or reviewing appropriate health, safety, environmental, and regulatory documents and for determining their applicability in relation to this standard prior to its use. This NACE standard may not necessarily address all potential health and safety problems or environmental hazards associated with the
7、 use of materials, equipment, and/or operations detailed or referred to within this standard. Users of this NACE standard are also responsible for establishing appropriate health, safety, and environmental protection practices, in consultation with appropriate regulatory authorities if necessary, to
8、 achieve compliance with any existing applicable regulatory requirements prior to the use of this standard. CAUTIONARY NOTICE: NACE standards are subject to periodic review, and may be revised or withdrawn at any time without prior notice. NACE requires that action be taken to reaffirm, revise, or w
9、ithdraw this standard no later than five years from the date of initial publication. The user is cautioned to obtain the latest edition. Owners of NACE standards may receive current information on all standards and other NACE International publications by contacting the NACE FirstService Department,
10、 1440 South Creek Drive, Houston, Texas 77084-4906 (telephone +1 281228-6200). Approved 2005-10-15 NACE International 1440 South Creek Drive Houston, Texas 77084-4906 +1 (281) 228-6200 ISBN 1-57590-201-X 2005, NACE InternationalNACE Standard RP0105-2005 Item No. 21106 RP0105-2005 NACE International
11、i _ Foreword This standard recommended practice presents guidelines for establishing minimum requirements to ensure proper material selection, application, and inspection of pipeline liquid-epoxy coatings used for the repair and rehabilitation of previously coated pipelines and for coating field joi
12、nts on the external surfaces of pipe. This standard is intended for use by corrosion control personnel, design engineers, project managers, purchasers, and construction engineers and managers. Coating selection for repair, rehabilitation, and field joints on buried steel pipelines is determined by s
13、pecific criteria relating to the project to be executed. In some cases, the factors limiting coating selection are similar to those considered during new pipeline coating activities, but when a pipeline is coated in the field there are additional factors that must be considered. Liquid-epoxy coating
14、 repair, rehabilitation, or field joint coating can be applied in, over, or beside a ditch, whether the pipeline is in service, out of service, or segmented. Application is dependent on many factors, including temperature. This standard was prepared by NACE Task Group 247 on Coatings, Liquid Epoxy f
15、or External Repair, Rehabilitations, and Weld Joints on Buried Steel Pipelines. This Task Group is administered by Specific Technology Group (STG) 03 on Coatings and Linings, Protective: Immersion and Buried Service. It is also sponsored by STG 04 on Coatings and Linings, Protective: Surface Prepara
16、tion, and STG 35 on Pipelines, Tanks, and Well Casings. This standard is issued by NACE under the auspices of STG 03. In NACE standards, the terms shall, must, should, and may are used in accordance with the definitions of these terms in the NACE Publications Style Manual, 4th ed., Paragraph 7.4.1.9
17、. Shall and must are used to state mandatory requirements. The term should is used to state something considered good and is recommended but is not mandatory. The term may is used to state something considered optional. _ RP0105-2005 ii NACE International _ NACE International Standard Recommended Pr
18、actice Liquid-Epoxy Coatings for External Repair, Rehabilitation, and Weld Joints on Buried Steel Pipelines Contents 1. General . 1 2. Definitions . 1 3. Coating Material2 4. Coating Performance 3 5. Surface Preparation of Pipe 4 6. Coating Application . 5 7. Inspection and Testing 6 8. Repair 8 9.
19、Backfilling 8 References 8 Table 1: Coating Properties 2 Table 2: Qualification Requirements 4 _ RP0105-2005 NACE International 1 _ Section 1: General 1.1 This standard presents guidelines for establishing minimum requirements for material selection, surface preparation, proper application, inspecti
20、on, and to ensure long-term coating performance of liquid-epoxy coatings applied to external pipe surfaces for coating repair, rehabilitation, or field joints. 1.2 The function of such coatings is to prevent corrosion when used in conjunction with cathodic protection. 1.3 This standard provides guid
21、elines for proper surface preparation and coating application and identifies inspection and repair techniques to ensure long-term coating performance. 1.4 The material for external coating shall be approved by the owner. Once a coating formulation is accepted by the owner, it shall not be changed un
22、less the owner is notified in writing. 1.5 The owner shall ensure that work is conducted in accordance with this standard and that quality is assured by qualified personnel such as NACE Coating Inspectors or equivalent (trained coating inspectors). The inspector shall have an excellent knowledge of
23、the application procedures and techniques generally used for high-performance coatings whether applied by brush, roller, or spray. The coating inspector should know the characteristics of air- and airless-spray plural components, and shall be familiar with the procedures used to apply coatings prope
24、rly with such equipment. 1.6 The coating inspector (company representative) shall have access at all times to the work performed, in accordance with the company specifications, and shall have the right to inspect such work and all material furnished by the applicator. 1.7 For surface preparation and
25、 coating applications the applicator shall use coating personnel, equipment, and procedures that have been prequalified by the manufacturer and approved by the owner. 1.8 Users of this standard shall be responsible for specifying applicable safety, health, and environmental practices to ensure compl
26、iance with all applicable regulations, including compliance with insurance requirements and directives. _ Section 2: Definitions Applicator: The organization responsible for the coating application. Backfill: Material placed in a hole to fill the space around the anodes, vent pipe, and buried compon
27、ents of a cathodic protection system. Backfill Ready: The stage or degree of cure, which may not be full chemical cure, that the coating has attained that provides resistance to moisture absorption and toughness to handle mechanical stresses including abrasion and backfill. Batch: The quantity of co
28、ating material produced during a continuous production run of not more than eight hours (h). Coating: A liquid, liquefiable, or mastic composition that, after application to a surface, is converted into a solid protective, decorative, or functional adherent film. Cutback: The length of pipe left unc
29、oated at each end for joining purposes (e.g., welding). Epoxy: Type of resin formed by the reaction of aliphatic or aromatic polyols (like bisphenol) with epichlorohydrin and characterized by the presence of reactive oxirane end groups. Holiday: A discontinuity in a protective coating that exposes u
30、nprotected surface to the environment. Inspector: The authorized agent of the owner. Owner: The owner company or the authorized agency that purchases the coating or coated pipe. Supplier: The manufacturer and/or distributor of the coating material and its authorized technician. RP0105-2005 2 NACE In
31、ternational _ Section 3: Coating Material 3.1 Coating Supplier Information 3.1.1 Upon request the coating material supplier shall furnish to the owner and/or applicator the following information in a written form: 3.1.1.1 Product data sheets including directions for handling, storage, and applicatio
32、n of the coating material; 3.1.1.2 Specification of basic physical properties and laboratory performance test results as listed in Table 1. 3.1.1.3 Certification of the determined physical properties of supplied material; and 3.1.1.4 Material safety data sheet (MSDS). TABLE 1 Coating Properties Prop
33、erty Value Limits Test Method Shelf Life In accordance with suppliers specification; in accordance with suppliers recommended storage conditions In accordance with suppliers specification Nominal Coating Thickness (dry-film thickness DFT or wet-film thickness WFT) In accordance with suppliers specif
34、ication In accordance with suppliers specification Cure Cycle (not applicable to all coatings) In accordance with suppliers specification In accordance with suppliers specification Time to backfill-ready at 10C (50F), 24C (75F), 35C (95F), and 65C (150F) In accordance with suppliers specification In
35、 accordance with suppliers specification Dielectric Strength In accordance with suppliers specification ASTM(A)D 1491Adhesion to Steel In accordance with suppliers specification In accordance with suppliers specification Moisture Permeation Rating of 1 to 3 NACE Standard RP0394,228 days; tap water;
36、at 24C (75F), 35C (95F), and 65C (150F) Cathodic Disbondment In accordance with suppliers specification, average of three specimens NACE Standard RP03942, ASTM G 8,3ASTM G 42,4CSA(B)Z245.20,524 h and 28 days at 24C (75F), 35C (95F), 65C (150F), and at maximum recommended operating temperature in acc
37、ordance with the manufacturers tests Temperature Usage Ranges In accordance with suppliers specification In accordance with suppliers specification Impact Resistance In accordance with suppliers specification ASTM G 146 Shore D Hardness In accordance with suppliers specification ASTM D 22407Cure tim
38、e at 24C (75F), 35C (95F), and 65C (150F)In accordance with suppliers specification In accordance with suppliers specification (A)ASTM International (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA 19428. (B)Canadian Standards Association (CSA), 5060 Spectrum Way, Mississauga, Ontario L4W 5N6 Ca
39、nada. RP0105-2005 NACE International 3 3.2 Handling of Coating Materials 3.2.1 Coating material batches shall be identified by a batch coding system devised by the supplier. The batch code shall include a reference to the date of manufacture. Coating materials shall be shipped and stored under cover
40、 according to the suppliers recommendations and in such a manner that contamination or adverse effects on the coating material or application are avoided. 3.2.2 Shelf Life The applicator shall ensure the material is within the shelf life recommended by the supplier. Any batch of coating material exc
41、eeding the suppliers recommended shelf life shall be subject to coating material reverification tests (see Table 1) prior to use. 3.3 Coating Material Properties 3.3.1 It is the suppliers responsibility to perform the tests cited in this section. The owner or applicator may also perform any or all o
42、f the cited tests as part of a quality assurance program. 3.3.2 The coating material shall meet the value limits for the properties listed in Table 1. 3.3.3 The owner may require and the supplier may provide information from tests other than those listed in Table 1. _ Section 4: Coating Performance
43、4.1 Desired characteristics of applied coating are outlined in NACE Standard RP0169.84.2 Performance Testing 4.2.1 Qualification The coating system should be qualified by the owner and/or coating applicator prior to coating application. This testing should be conducted on each applicable coating and
44、 meet the acceptance criteria (see Table 2). It is the responsibility of the owner to perform these tests. Once qualification is established, further qualification testing is not required unless there is a change in coating material, formulation, or location of manufacture. There may be a variety of
45、 other tests that the owner may wish to perform to verify the coating meets requirements. 4.2.2 Performance Testing Steel Panels Test panels shall be hot-rolled carbon steel (UNS(1)G10200 AISI(2)1020 or equivalent) and have dimensions in accordance with the cited test method. The surface shall be bl
46、ast cleaned to a near-white finish (NACE No. 2/SSPC(3)-SP 109) using steel grit (G25, G401050 to 55 Rockwell C hardness HRC) to a surface profile of 50 to 100 m (2 to 4 mil), measured from peak to valley. 4.2.3 Coating of Test Panels 4.2.3.1 Coating application and curing shall be in accordance with
47、 the suppliers recommendations. 4.2.3.2 Coating thickness on the test panel shall be measured using a magnetic pull-off coating thickness gauge calibrated against a NIST thickness standard (NIST(4)-SRM 136311) that is within 20% of the specified coating thickness (SSPC-PA 212) or magnetic-flux or fixed-probe gauges that must be calibrated with plastic shims on a representative grit-blasted surface. 4.2.4 Performance of Laboratory-Coated Steel Panels 4.2.4.1 Testing A coating shall be considered qualified when the results of a duplicate set of
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