1、 Standard Practice Field Application of Bonded Tape Coatings for External Repair, Rehabilitation, and Weld Joints on Buried Metal Pipelines This NACE International standard represents a consensus of those individual members who have reviewed this document, its scope, and provisions. Its acceptance d
2、oes not in any respect preclude anyone, whether he or she 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 International standard is to be construed as grantin
3、g any right, by implication 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 shoul
4、d in no way be interpreted 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 International assumes no respo
5、nsibility for the interpretation or use of this standard by other parties and accepts responsibility for only those official NACE International interpretations issued by NACE International in accordance with its governing procedures and policies which preclude the issuance of interpretations by indi
6、vidual volunteers. Users of this NACE International standard are responsible for reviewing appropriate health, safety, environmental, and regulatory documents and for determining their applicability in relation to this standard prior to its use. This NACE International standard may not necessarily a
7、ddress all potential health and safety problems or environmental hazards associated with the use of materials, equipment, and/or operations detailed or referred to within this standard. Users of this NACE International standard are also responsible for establishing appropriate health, safety, and en
8、vironmental protection practices, in consultation with appropriate regulatory authorities if necessary, to achieve compliance with any existing applicable regulatory requirements prior to the use of this standard. CAUTIONARY NOTICE: NACE International standards are subject to periodic review, and ma
9、y be revised or withdrawn at any time in accordance with NACE technical committee procedures. NACE International requires that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of initial publication. The user is cautioned to obtain the latest edit
10、ion. Purchasers of NACE International standards may receive current information on all standards and other NACE International publications by contacting the NACE International FirstService Department, 1440 South Creek Dr., Houston, Texas 77084-4906 (telephone +1-281-228-6200). Approved 2009-11-08 NA
11、CE International 1440 South Creek Drive Houston, Texas 77084-4906 +1 281-228-6200 ISBN: 1-57590-234-6 2009, NACE International NACE SP0109-2009Item No. 21143SP0109-2009 NACE International i _ Foreword This NACE standard practice provides the most current technology and industry practices for materia
12、l requirements and the use of field-applied tape coatings for external repair, rehabilitation, and weld joints on buried metal pipelines. This standard is intended for use by corrosion control personnel, design engineers, project managers, purchasing personnel, and construction engineers and manager
13、s. It is applicable to underground metal pipelines in the oil and gas gathering, distribution, and transmission industries as well as water and wastewater pipelines. This standard was prepared by NACE Task Group (TG) 251, “Coatings, Tape for External Repair, Rehabilitations, and Weld Joints on Pipel
14、ines.” This TG is administered by Specific Technology Group (STG) 03, “Coatings and Linings, Protective: Immersion and Buried Service.” It is sponsored by STG 04, “Coatings and Linings, Protective: Surface Preparation,” and STG 35, “Pipelines, Tanks, and Well Casings.” This standard is issued by NAC
15、E International 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. The terms shall and must are used to state a requirement, and are considered mandatory. The term s
16、hould is used to state something good and is recommended, but is not considered mandatory. The term may is used to state something considered optional. _ SP0109-2009 ii NACE International _ NACE International Standard Practice Field Application of Bonded Tape Coatings for External Repair, Rehabilita
17、tion, and Weld Joints on Buried Metal Pipelines Contents 1. General 1 2. Definitions 1 3. Bonded Tape Coating Systems 2 4. Tape Coating Materials for Field Coating Systems . 4 5. Cold-Applied Tape Coatings with Tension, Field Applied, Bonded Multilayer 12 6. Common Guidelines for Tape Coating Materi
18、als 14 7. Tape Coating SystemPipe Section and Weld Joint Tape Coating System Performance 15 8. Pipe Section and Weld Joint Tape Coating SystemSurface Preparation of Pipe . 16 9. Pipe Section and Weld Joint Tape Coating SystemCoating Application . 17 10. Pipe Section and Weld Joint Tape Coating Syste
19、mInspection, Repair, and Handling 19 References 20 TABLES Table 1: Tapes and Application . 3 Table 2: Accessory Materials . 4 Table 3: Hot-Applied Tape System Requirements . 7 Table 4: Hot-Applied Tape Liquid Adhesive or Primer Requirements 7 Table 5: Liquid Adhesive (Primer) Materials Requirement .
20、 8 Table 6: Cold-Applied Laminate Polymeric Tape Requirements 8 Table 7: Liquid Adhesive (Primer) Requirements . 11 Table 8: Reinforced Polymeric Tape Material Requirements . 11 Table 9: Optional Unbonded Outer-Layer Material Requirements . 11 Table 10: Cold-Applied Thin Backing Polymeric Tape Liqui
21、d Adhesive Requirements . 12 Table 11: Cold-Applied Thin Backing Polymeric Tape System Requirements . 12 Table 12: Liquid Adhesive (Primer) Material Requirements . 13 Table 13: Pipeline Section and Weld Joint Inner-Layer Tape Material Requirements . 13 Table 14: Pipeline Section and Weld Joint Mecha
22、nical Outer-Layer Material Requirements . 14 Table 15 Pipeline Section and Weld Joint Total Tape System Material Requirements . 14 _ SP0109-2009 NACE International 1 _ Section 1: General 1.1 This standard practice presents guidelines for establishing the minimum requirements to ensure the proper sel
23、ection, application, and performance of bonded tape coatings. These coatings are used as the external corrosion protection for new and existing pipe, girth welds, and fittings, and for repair and rehabilitation. The primary function of these tape coating systems is to prevent corrosion of the pipeli
24、ne when used with or without cathodic protection (CP). This standard provides guidelines for the proper pipeline surface preparation, tape coating system application, inspection, and tape coating damage repair to ensure long-term performance. 1.2 Bonded tape coatings can be applied in, over, or besi
25、de a pipeline trench, whether the pipeline is in service, out of service, or segmented. If an extended period of aboveground storage of coated pipe is anticipated, consideration should be given to the ability of the coating to resist degradation by ultraviolet (UV) light and other atmospheric and en
26、vironmental conditions. Because aboveground and environmental conditions for storage sites vary, the manufacturer should be consulted regarding the correct type of wrap or procedure recommended for the specific anticipated storage conditions and method for UV protection. 1.3 These tape coatings may
27、also be applied in a fabrication shop or coating plant. The manufacturer should be consulted regarding the correct type of application equipment and procedures. 1.4 The purchaser shall assess construction and soil conditions that could lead to mechanical damage (e.g., abrasion, impact, soil stress)
28、to the coating. The tape manufacturer should be consulted for the recommendations of tape systems suitable for the construction or in-ground conditions. The tape manufacturer should recommend appropriate products and procedures for ensuring the required in-service performance. Recommendations may in
29、clude either specific products or precautionary measures, e.g., special backfills, rockshield, or other damage prevention techniques. This depends on the conditions encountered. _ Section 2: Definitions Applicator: The person, company, or organization responsible to the purchaser for the coating app
30、lication. Batch or Lot: The quantity of coating material produced during a continuous production run of not more than eight hours. The quantity of coating material produced from a single batch mixture of coating material. Coating Materials: Premanufactured bonded tape coating and associated accessor
31、y products such as primer, liquid adhesives, filler materials, and coating repair materials. Coating System: The complete number and types of coats applied to a substrate in a predetermined order. (When used in a broader sense, surface preparation, pretreatments, dry film thickness, and manner of ap
32、plication are included.) Cold Applied: The application of a coating at ambient temperature, not requiring the use of heat. Cutback Area: The area of pipe left uncoated at the coating mill/plant to facilitate welding of adjacent pipe joints. Field Joint Area: The girth weld and immediate area surroun
33、ding the girth weld. Holiday: A discontinuity in a protective coating that exposes unprotected surface to the environment. Hot Applied: The application of a tape coating using a propane torch or other suitable heating device for proper application. SP0109-2009 2 NACE International Inspector: The aut
34、horized agent of the purchaser. Liquid Adhesive or Primer: Cold-applied liquids that provide a specifically designed environment to enhance the bond of a particular coating system. The liquid adhesive or primer serves to thoroughly wet the metal surface, penetrate the metal surface variations, and p
35、rovide an effective bonding medium between the metal surface and the tape wrap coating. Material Safety Data Sheet (MSDS): A printed source of information about the hazards of materials, including coatings. The MSDS contains the following information: (1) product identification; (2) hazardous ingred
36、ients, including permissible exposure limits (PEL) and threshold limit value (TLV); (3) physical properties; (4) fire and explosion hazard data; (5) health hazard data; (6) chemical reactivity/stability data; (7) spill and leak procedures; (8) special protection information; and (9) additional speci
37、al precautions. Maximum Service Temperature (MST): The maximum operation temperature at which the tape coating system may be used. Metal Pipelines: Includes carbon steel, stainless steel, ductile iron, cast iron, copper, aluminum, or other metal pipelines. Multicoat Tape System: A tape system that u
38、ses more than one type of tape construction and thickness, usually an inner and outer wrap, applied as a multilayered coating system. Purchaser: The owner company or the authorized agency that has the authority over the pipe to which the coating is to be applied. Repair Area: Area of the coating tha
39、t is damaged or in need of repair. Rockshield: A durable, protective material that is bonded or nonbonded to the coating and is either perforated or electrically conductive under operating conditions to avoid shielding of cathodic protection. Shelf Life: The maximum length of time packaged materials
40、 (e.g., coating materials) can be stored at specific conditions and remain in usable condition. Single Coat Tape System: A stand-alone tape system that uses a single type of tape construction and thickness, even when applied with more than one layer in the coating system. Step-Down: The lower surfac
41、e of a transition area; two uneven adjoining pipe surfaces such as on fittings, mechanical joints, or existing coating to field coating. Substrate: The external surface of the pipe. Supplier: The manufacturer or distributor of the coating material and its authorized technician. _ Section 3: Bonded T
42、ape Coating Systems 3.1 A bonded tape coating required for normal conditions contains the following components: (a) Primer and liquid adhesives (if specified); (b) Premanufactured cold- or hot-applied tape; (c) Filler materials and seam tapes (if required); SP0109-2009 NACE International 3 (d) Coati
43、ng repair materials (if required); and (e) Rockshield or protective outer wrap (if required) 3.2 Bonded tape coating systems consist of one or several layers of materials applied to the pipe in the form of tapes by spiral or circumferential wrapping (colloquially referred to as “cigarette wrap” see
44、Paragraph 9.2.2.2). Coatings can consist of one or more basic types of coating materials as described in Paragraph 3.1 Primer and liquid adhesives (if specified), and seam tapes and filler(s) can be used in conjunction with these coating materials to improve adhesion or facilitate application. 3.3 C
45、ommon conventional single or multilayer bonded tape coating systems are defined as: (a) Single Coat Systems (see Section 4) 1. Hot-Applied Systems A tape coating system requiring the use of a propane torch or other suitable heating device for proper application. 2. Cold-Applied Systems A tape coatin
46、g system not requiring the use of heat for proper application. (b) Multicoat Systems (see Section 5) 1. Inner Layer Coating primarily designed to protect the pipe surface from corrosion damage. 2. Mechanical Outer Layer Coating primarily designed to protect the inner layer from mechanical stresses.
47、3.4 The prevailing tape coating materials and accessories are described in Tables 1 and 2. Table 1: Tapes and Application Tape Description Application (Cold or Hot) Bituminous tape Corrosion protection tape consisting of a coal tar base or bituminous base coating material supported on a fabric of or
48、ganic or inorganic fibers. Hot Applied Polymeric tapes Corrosion protection tape consisting of a compound adhesive to metal and generally bonded to a flexible polymer film and may contain a synthetic reinforcement. These tapes can be subdivided into Laminate, Reinforced, and Thin Backing. Cold or Hot Applied Laminate polymeric tape Corrosion protection tape consisting of a flexible pol
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