1、Recommended Practice for Internal Coating of Line Pipe for Non-corrosive Gas Transmission ServiceAPI RECOMMENDED PRACTICE 5L2FOURTH EDITION, JULY 2002REAFFIRMED, MAY 2015Recommended Practice for Internal Coating of Line Pipe for Non-corrosive Gas Transmission ServiceUpstream SegmentAPI RECOMMENDED P
2、RACTICE 5L2FOURTH EDITION, JULY 2002REAFFIRMED, MAY 2015SPECIAL NOTESAPI publications necessarily address problems of a general nature. With respect to partic-ular circumstances, local, state, and federal laws and regulations should be reviewed.API is not undertaking to meet the duties of employers,
3、 manufacturers, or suppliers towarn and properly train and equip their employees, and others exposed, concerning healthand safety risks and precautions, nor undertaking their obligations under local, state, or fed-eral laws.Information concerning safety and health risks and proper precautions with r
4、espect to par-ticular materials and conditions should be obtained from the employer, the manufacturer orsupplier of that material, or the material safety data sheet.Nothing contained in any API publication is to be construed as granting any right, byimplication or otherwise, for the manufacture, sal
5、e, or use of any method, apparatus, or prod-uct covered by letters patent. Neither should anything contained in the publication be con-strued as insuring anyone against liability for infringement of letters patent.Generally, API standards are reviewed and revised, reafrmed, or withdrawn at least eve
6、ryve years. Sometimes a one-time extension of up to two years will be added to this reviewcycle. This publication will no longer be in effect ve years after its publication date as anoperative API standard or, where an extension has been granted, upon republication. Statusof the publication can be a
7、scertained from the API Upstream Segment telephone (202) 682-8000. A catalog of API publications and materials is published annually and updated quar-terly by API, 1220 L Street, N.W., Washington, D.C. 20005.This document was produced under API standardization procedures that ensure appropri-ate not
8、ication and participation in the developmental process and is designated as an APIstandard. Questions concerning the interpretation of the content of this standard or com-ments and questions concerning the procedures under which this standard was developedshould be directed in writing to the standar
9、dization manager, American Petroleum Institute,1220 L Street, N.W., Washington, D.C. 20005. Requests for permission to reproduce ortranslate all or any part of the material published herein should also be addressed to the gen-eral manager.API standards are published to facilitate the broad availabil
10、ity of proven, sound engineer-ing and operating practices. These standards are not intended to obviate the need for apply-ing sound engineering judgment regarding when and where these standards should beutilized. The formulation and publication of API standards is not intended in any way toinhibit a
11、nyone from using any other practices.Any manufacturer marking equipment or materials in conformance with the markingrequirements of an API standard is solely responsible for complying with all the applicablerequirements of that standard. API does not represent, warrant, or guarantee that such prod-u
12、cts do in fact conform to the applicable API standard.All rights reserved. No part of this work may be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher. Contact th
13、e Publisher, API Publishing Services, 1220 L Street, N.W., Washington, D.C. 20005.Copyright 2002 American Petroleum InstituteFOREWORDThis Recommended Practice is under the jurisdiction of the Subcommittee on TubularGoods of the American Petroleum Institute. It was prepared by a Formulating Committee
14、which included representatives of Pipeline Operators and Line Pipe Manufacturers and advi-sors from coating manufacturers and coating applicators as well as other interested individuals.The purpose of this Recommended Practice is to present methods of qualifying coatingmaterials, production applicat
15、ion of such materials, and a nal acceptance test of coated pipefor non-corrosive natural gas transmission. Some benets to be derived from internallycoated line pipe are: (1) Improved ow characteristics (2) Corrosion protection during theperiod preceding construction (3) The enhancement of visual ins
16、pection of the internal pipesurfaces (4) The Improvement of pigging efciency.Recommendations made in this Recommended Practice need not necessarily be consid-ered as minimum standard requirements. However, the Recommended Practice is written insuch a manner that it may be adopted as part of a contra
17、ct specication. The RecommendedPractice does not in any way intend to recommend one type of coating over any other typeand regards all types which can pass the specied qualication as being suitable for theintended purpose. As new materials and practices are developed they will be considered forinclu
18、sion in this Recommended Practice.API publications may be used by anyone desiring to do so. Every effort has been made bythe Institute to assure the accuracy and reliability of the data contained in them; however, theInstitute makes no representation, warranty, or guarantee in connection with this p
19、ublicationand hereby expressly disclaims any liability or responsibility for loss or damage resultingfrom its use or for the violation of any federal, state, or municipal regulation with which thispublication may conict.Suggested revisions are invited and should be submitted to the standardization m
20、anager,American Petroleum Institute, 1220 L Street, N.W., Washington, D.C. 20005.iiiCONTENTSPage1 SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.2 Denitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 COATING MATERIAL SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.1 Purpose .
22、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.3 Physical Properties . . . . . . . . . . . . . . . . .
23、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 LABORATORY COATING TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.2
24、Steel Panels for Performance Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.3 Laboratory Application of Coating Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.4 Conditioning of Coated Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、 . . . . . . . . . . . . 33.5 Performance of Laboratory Coated Steel Panels . . . . . . . . . . . . . . . . . . . . . . . . . . 33.6 Performance TestingGlass Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 APPLICATION PRACTICES . . . . . . . . . . . . . . . . . . . .
26、. . . . . . . . . . . . . . . . . . . . . . . . 34.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.2 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27、. . . 34.3 Handling of Pipe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.4 Handling of Coating Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.5 Cleaning of Pipe . . . . . . . . . . . . . . . . . .
28、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54.6 Coating of Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54.7 Repairs to Coating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29、. . . . . . . 64.8 Pipe Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 PRODUCTION INSPECTION AND ACCEPTANCE. . . . . . . . . . . . . . . . . . . . . . . . . 65.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30、. . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.2 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.3 Production Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31、 . . . . 7APPENDIX A METHOD OF DETERMINING VOLUME SOLIDS . . . . . . . . . . . . . . . 9APPENDIX B SALT SPRAY LABORATORY TEST. . . . . . . . . . . . . . . . . . . . . . . . . . 11APPENDIX C STRIPPING TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13APPENDIX
32、D ADHESION LABORATORY TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . 15APPENDIX E GAS BLISTERING LABORATORY TEST . . . . . . . . . . . . . . . . . . . . . 17APPENDIX F HYDRAULIC BLISTERING LABORATORY TEST . . . . . . . . . . . . . 19APPENDIX G PINHOLE LABORATORY TEST . . . . . . . . . .
33、. . . . . . . . . . . . . . . . . . . 21Tables3.5 Performance of Laboratory Coated Steel Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . 4v1API Recommended Practice for Internal Coating of Line Pipe For Gas Transmission Service1 ScopeThis Recommended Practice provides for the internal c
34、oat-ing of line pipe used for non-corrosive natural gas service.The recommendations provided herein cover:a. Section 1 Scopeb. Section 2 Coating Material Specicationc. Section 3 Laboratory Coating Testingd. Section 4 Application Practicese. Section 5 Production Inspection and AcceptanceThe Recommend
35、ation is limited to the application of inter-nal coatings on new pipe prior to installation.It is intended that the applicator be responsible for comply-ing with all of the provisions of this Recommended Practice,but that the Purchaser may make any investigation necessaryto satisfy himself of compli
36、ance by the applicator.1.1 GENERAL1.1.1 Coating Supplier InformationThe coating material supplier shall furnish to the purchaserand/or applicator the following information in a written formwith each batch:a. Directions for mixing and/or thinning with solvents asrequired.b. Directions for handling an
37、d storing of the coatingmaterials.c. Specication of the basic physical properties and perfor-mance test results of the material. These basic physicalproperties and performance test results shall be within therange permitted in this Recommended Practice (Section 2).d. Certication of the determined ph
38、ysical properties (2.3) ofeach batch of coating material shipped.1.2 DEFINITIONS1.2.1 Applicator:The Applicator is the organizationresponsible to the purchaser for the application of the coating.1.2.2 Purchaser:The Purchaser is the owner companyor the authorized agency that buys the coated pipe.1.2.
39、3 Supplier:The Supplier is the manufacturer and/ordistributor of the coating material and its authorized qualiedtechnician.1.2.4 Inspector: The Inspector is the authorized agentof the purchaser.1.2.5 Coating Material:Coating material indicates theliquid material prior to application on the substrate
40、.1.2.6 Coating:Coating indicates the coating lm asapplied to the substrate.1.2.7 Batch:A Batch is the quantity of coating materialmanufactured at one time in a single vessel and identied by aunique batch number.2 Coating Material Specification2.1 PURPOSEThis section describes laboratory methods of i
41、dentifyingand qualifying coating materials suitable for use under theintent of this Recommended Practice.2.2 DESCRIPTION2.2.1 Coating Materials2.2.1.1The material normally consists of the following: a. Pigmented or clear base.b. Pigmented or clear converter.c. Pigment that includes sufcient rust inh
42、ibitor to pass saltspray test. (See 3.5.1)d. Application solvent for adjusting to suitable sprayviscosity.2.2.1.2The coating material shall contain no substanceswhich could be released from the coating in service and provedetrimental to the operation of the pipeline and/or quality ofthe gas.2.2.1.3T
43、he coating material, including repair materials,shall neither degrade nor produce hazardous vapors whenlater subjected to external coating thermal cycles up to 575F(300C).2.2.2 MixingThe coating materials shall be mixed before use by agitat-ing together portions of base and converter as recommendedb
44、y the supplier.2.2.3 ThinningThe coating material may be thinned by mixing with thesolvent supplied and/or specied by the supplier. 2 API RECOMMENDEDPRACTICE5L23 Laboratory Coating Testing3.1 PURPOSEThis section describes laboratory tests required to qualifycoating materials. Qualication of coating
45、by laboratorymethods is required prior to production. Once qualication ismade, no further qualication tests are required unless thecoating materials or laboratory application methods change.For each qualied material, the supplier shall provide a quali-tative analysis. An acceptable method is an infr
46、a-red spec-trum. The supplier shall certify to the applicator and/orpurchaser the results of tests performed under Section 3 foreach qualied coating material.3.2 STEEL PANELS FOR PERFORMANCE TESTINGTest Panels shall be mild carbon steel 3 x6 x0.032 in. (75 x150 x0.81 mm). The surface to be coated sh
47、all be sandblasted to any of the following standards:1. NACE No. 1 white metal nish in accordance withNACE Visual Standard TM-01-75.2. Steel Structures Painting Council SSPC-Vis 1-82T SP5.3. Swedish Pictorial Standard SIS 05-59-00 S.a.3.4. DIN 55928 PART 4.3.3 LABORATORY APPLICATION OF COATING MATER
48、IALS3.3.1 MixingCoating material shall be mixed or thinned to normal sprayviscosity in accordance with suppliers recommendation.3.3.2 ApplicationApplication shall be made by spray on the prepared side ofa test panel. The atmospheric environment, during spraying,shall be controlled to 77 5F (25 3C),
49、and a maximumrelative humidity of 80%. The back and edges of the panelshall be protected.2.3 PHYSICAL PROPERTIES2.3.1 Individual ComponentsProperty Value Range Permitted MethodBase Gal. Wt (1) 0.2 lb (90 g) ASTM D1475Converter Gal. Wt. (1) 0.2 lb (90 g) ASTM D1475Solvent Boiling Range (1) Specify Initial and 95% ASTM D1078Base Boiling Range (1) Specify Initial and 95% ASTM D1078Converter Boiling Range (1) ASTM D1078Application Boiling Range (1) ASTM D1078Base Settling (1) 4, minimum ASTM D1309 (testing)ASTM D869 (reporting)Converter Se
