1、 Standard Practice Extruded Polyolefin Resin Coating Systems with Soft Adhesives for Underground or Submerged Pipe This NACE International standard represents a consensus of those individual members who have reviewed this document, its scope, and provisions. Its acceptance does not in any respect pr
2、eclude 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 granting any right, by implicati
3、on 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 interprete
4、d 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 responsibility for the interpr
5、etation 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 individual volunteers. Users
6、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 address all potential heal
7、th 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 environmental protection pr
8、actices, 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 CAUTIONARY NOTICE: NACE International standards are subject to periodic review, and may be revised or withdrawn
9、 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 and subsequently from the date of each reaffirmation or revision. The use
10、r is cautioned to obtain the latest edition. 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
11、+1 281/228-6200). Revised 2007-03-10 Revised 1996-03-30 Approved March 1985 NACE International 1440 South Creek Drive Houston, Texas 77084-4906 +1 281/228-6200 ISBN 1-57590-017-3 2007, NACE International NACE SP0185-2007 (formerly RP0185-96) Item No. 21029 SP0185-2007 NACE International i _ Foreword
12、 This standard practice prescribes the material characteristics, application methods, and handling, shipping, and installation procedures for polyolefin resin coating systems extruded over soft adhesives for the prevention of external corrosion of underground or submerged pipelines. This standard is
13、 intended for use by coating applicators, engineers, and pipeline owners as a guide to qualifying coating materials and specifying application parameters. This standard was originally prepared in 1985 by NACE International Task Group (TG) T-10D-12, a component of Unit Committee T-10D on Protective C
14、oating Systems, and was revised in 1996 by Task Group T-10D-16. This standard was revised in 2007 by TG 265. This TG is administered by Specific Technology Group (STG) 03 on Protective Coatings and LiningsImmersion and Buried Service. It is also sponsored by STG 04 on Protective Coatings and Linings
15、Surface Preparation, STG 05 on Cathodic/Anodic Protection, and STG 35 on Pipelines, Tanks, and Well Casings. The standard is issued by NACE 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
16、 in the NACE Publications Style Manual, 4th ed., Paragraph 7.4.1.9. Shall and must are used to state mandatory requirements. Should is used to state something considered good and is recommended but is not mandatory. May is used to state something considered optional. _ SP0185-2007 ii NACE Internatio
17、nal _ NACE International Standard Practice Extruded Polyolefin Resin Coating Systems with Soft Adhesives for Underground or Submerged Pipe Contents 1. General. 1 2. Definitions. 1 3. Coating Material . 1 4. Material Requirements . 1 5. Surface Preparation 4 6. Coating Application. 5 7. Joint Coating
18、 and Field Repair . 6 8. Handling, Shipping, and Storage 6 9. Installation Procedures. 7 References . 7 _ SP0185-2007 NACE International 1 _ Section 1: General 1.1 This standard presents guidelines for establishing minimum requirements to ensure proper application and performance of plant-applied po
19、lyolefin resin coating systems extruded over soft adhesives for external surfaces of pipe. 1.2 The function of the coating system is to prevent corrosion by separating the pipe from its environment when used in conjunction with cathodic protection. The coating system is used in the oil, gas, and wat
20、erworks industries where generally moderate operating temperatures are attained and good handling capabilities are required. 1.3 This standard describes methods for qualifying and controlling the quality of the extruded polyolefin resin coating systems, provides guidelines for proper application, an
21、d identifies inspection and repair techniques to ensure long-term coating system performance. _ Section 2: Definitions Applicator: The organization responsible to the purchaser for the coating application. Batch: The quantity of coating material produced during a continuous production run as defined
22、 by the supplier. Cutback: The length of pipe left uncoated at each end for joining purposes (e.g., welding). Holiday: A discontinuity in a protective coating that exposes unprotected surface to the environment. MSDS: Material Safety Data Sheet Purchaser: The owner company or the authorized agency t
23、hat purchases the coated pipe. Supplier: The supplier or distributor of the coating material and its authorized technician. _ Section 3: Coating Material 3.1 Coating Supplier Information 3.1.1 The coating material supplier shall furnish to the purchaser and/or applicator the following information in
24、 a written form upon request: 3.1.1.1 Directions for handling and storage of the coating material; 3.1.1.2 Specification of the basic physical properties and laboratory-performance test results; 3.1.1.3 Certification of the determined physical properties of each batch of material; and 3.1.1.4 Materi
25、al Safety Data Sheets. 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 according to th
26、e suppliers recommendations and in such a manner that contamination or adverse effects on application are avoided. _ Section 4: Material Requirements 4.1 This standard details materials and methods of application for two types of polyolefin resin coating systems extruded over soft adhesives on pipe
27、for underground or submerged service. Included in the recommendations are surface preparation criteria, application methods, electrical inspection criteria, pipe handling techniques, and coating system repair methods. 4.2 The two types of extruded polyolefin resin coating systems with soft adhesives
28、 are: SP0185-2007 2 NACE International 4.2.1 Type A: Polyolefin resin that is crosshead-extruded on the pipe as a seamless coating over a hot-applied mastic adhesive. The adhesive for the Type A coating shall consist of a blend of asphalt, rubber, and high-molecular-weight resins (see Table 1). TABL
29、E 1: Typical Property Values for Type A Coating SystemsProperty Test Standard(A)Polyolefin Resin Adhesive Total System Density (pigmented) Polyethylene resin Polypropylene resin ASTM(B)D 15051or ASTM D 7922Min. 0.95 g/cm3Min. 0.90 g/cm3 Flow rate Polyethylene resin Polypropylene resin ASTM D 12383Ma
30、x. 0.75 g/10 min Max. 1.00 g/10 min Tensile elongation ASTM D 6384Min. 100% Tensile yield strength ASTM D 638 Min. 19 MPa (2,800 psi) Hardness ASTM D 22405Min. 55 Shore D Dielectric strength ASTM D 1496 Min. 20 kV/mm (500 V/mil) Water absorption ASTM D 5707 Max. 0.02 wt% Flow at 70C (158F) CSA(C)Z24
31、5.21 (12.2)8- Max. 14 mm (0.55 in.) - Softening point ASTM E 289 Min. 60C (140F) (A)The latest revisions of the recommended test standards should be used. (B)ASTM International (ASTM), 100 Barr Harbor Dr., West Conshohocken, PA 19428-2959. (C)CSA International (CSA), 178 Rexdale Boulevard, Toronto,
32、ON M9W 1R3 Canada. 4.2.2 Type B: Polyolefin resin that is extruded spirally around the pipe to fuse and form as a seamless coating over an extruded butyl-rubber adhesive (see Table 2). 4.3 The typical property values contained in Tables 1 and 2 are furnished by the suppliers and are not intended for
33、 comparative use. They are values of the protective coating system materials in current use. 4.4 An extruded polyolefin resin coating shall be protected from ultraviolet deterioration by the addition of chemical ultraviolet absorbers to the base polyolefin resin. The ultraviolet absorbers shall be c
34、apable of protecting the extruded polyolefin resin-coated pipe for a minimum of six months of aboveground storage. SP0185-2007 NACE International 3 TABLE 2: Typical Property Values for Type B Coating Systems Property Test Standard(A)Polyolefin Resin Butyl Adhesive Total System Density (pigmented) AS
35、TM D 1505 Min. 0.95 g/cm3Min. 1 g/cm3 Melt flow rate (condition 190oC/2.16 kg) ASTM D 1238 Max. 0.75 g/10 min Min. 1.8 g/10 min Max. 8.0 g/10 min. Tensile elongation ASTM D 638 Min. 500% Tensile yield strength ASTM D 638 Min. 19 MPa (2,800 psi) Hardness ASTM D 2240 Min. 60 Shore D Dielectric strengt
36、h ASTM D 149 Min. 28 kV/mm (700 V/mil) Water absorption ASTM D 570 Max. 0.02 wt% (A)The latest revisions of the recommended test standards should be used. 4.5 The need for performance testing shall be determined according to performance history. Three categories shall be used: 4.5.1 Established gene
37、ric coating system to be used in the established service or environment. 4.5.2 Established generic coating system to be used in a new service or environment. 4.5.3 New coating system with no service history. 4.6 A coating system that meets one or more of the following criteria for at least five year
38、s shall be considered an established coating system: 4.6.1 No observed increase, attributable to deterioration of the coating, in the cathodic protection current density required to maintain the pipe-to-soil potential in accordance with NACE SP0169.104.6.2 No observed decrease in the coating effecti
39、veness as a moisture barrier. 4.7 An established generic coating system to be used in the established service or environment shall not require additional performance testing. 4.8 An established extruded polyolefin resin coating system selected for a new environment or service condition shall first b
40、e tested and evaluated for the extremes of the new service conditions or environments that may be encountered. Such extreme service conditions may include the following: 4.8.1 Temperatures of underground or submerged pipe coatings can be mild, below freezing, or comparatively high. Freezing temperat
41、ures can be encountered in permafrost conditions and in shallow-buried pipe. Comparatively high temperatures (60C 140F) are found on gas compressor discharge lines, pipe-type cables, and heated crude oil pipelines. The temperature resistance of extruded polyolefin coating systems varies based on the
42、 polyolefin and adhesive systems specified. The suppliers recommendations should be followed, and industry experience should be evaluated. 4.8.2 Environmental conditions may vary from minimal to high soil stress levels. The stresses created by the expansion and contraction of clays as they are alter
43、nately wetted and dried are an example of high soil stress levels. The soil stress resistance of the coating system shall be evaluated at the maximum service temperature. The acceptable soil stress resistance shall be agreed on between the purchaser, the applicator, and the supplier. 4.8.3 Relativel
44、y high hydrostatic head pressures may be imposed for deep submergence. 4.8.4 The chemistry of the environment may vary from fresh water to brackish or salt water. 4.9 New Coating Systems 4.9.1 A new extruded polyolefin resin coating system should first be evaluated in accordance with NACE SP0169, wh
45、ich details the following: 4.9.1.1 Application of the extruded coating system under mill-application production conditions; 4.9.1.2 Laboratory testing; 4.9.1.3 Installation under field conditions; and 4.9.1.4 In-service field performance tests. 4.9.2 The laboratory tests listed in Table 3 of this st
46、andard should be used to evaluate new coatingSP0185-2007 4 NACE International systems. The tests listed in Table 4 may be used to supplement those in Table 3. TABLE 3: Recommended Test Methods(A) (A)The latest revisions of the recommended test methods should be used. (B)For Type B coating systems, u
47、sed to test the adhesive strength between the coating and substrate. (C)For Type A coating systems, used to test the adhesive strength between the coating and substrate by the hanging weight method. TABLE 4: Supplemental Test Methods(A) (A)The latest revisions of the recommended test methods should be used. _ Section 5: Surface Preparation 5.1 This section emphasizes the importance of proper surface preparation of the pipe because the condition of this interface direct
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