1、CRA Line PipeAPI SPECIFICATION 5LCFOURTH EDITION, MARCH 2015ERRATA, OCTOBER 2015API MONOGRAM PROGRAM EFFECTIVE DATE: SEPTEMBER 3, 2015Special NotesAPI publications necessarily address problems of a general nature. With respect to particular circumstances, local,state, and federal laws and regulation
2、s should be reviewed.Neither API nor any of APIs employees, subcontractors, consultants, committees, or other assignees make anywarranty or representation, either express or implied, with respect to the accuracy, completeness, or usefulness of theinformation contained herein, or assume any liability
3、 or responsibility for any use, or the results of such use, of anyinformation or process disclosed in this publication. Neither API nor any of APIs employees, subcontractors,consultants, or other assignees represent that use of this publication would not infringe upon privately owned rights.API publ
4、ications may be used by anyone desiring to do so. Every effort has been made by the Institute to assure theaccuracy and reliability of the data contained in them; however, the Institute makes no representation, warranty, orguarantee in connection with this publication and hereby expressly disclaims
5、any liability or responsibility for loss ordamage resulting from its use or for the violation of any authorities having jurisdiction with which this publication mayconflict.API publications are published to facilitate the broad availability of proven, sound engineering and operatingpractices. These
6、publications are not intended to obviate the need for applying sound engineering judgmentregarding when and where these publications should be utilized. The formulation and publication of API publicationsis not intended in any way to inhibit anyone from using any other practices.Any manufacturer mar
7、king equipment or materials in conformance with the marking requirements of an API standardis solely responsible for complying with all the applicable requirements of that standard. API does not represent,warrant, or guarantee that such products do in fact conform to the applicable API standard.Clas
8、sified areas may vary depending on the location, conditions, equipment, and substances involved in any givensituation. Users of this Specification should consult with the appropriate authorities having jurisdiction.Users of this Specification should not rely exclusively on the information contained
9、in this document. Sound business,scientific, engineering, and safety judgment should be used in employing the information contained herein. All rights reserved. No part of this work may be reproduced, translated, stored in a retrieval system, or transmitted by any means, electronic, mechanical, phot
10、ocopying, recording, or otherwise, without prior written permission from the publisher. Contact the Publisher, API Publishing Services, 1220 L Street, NW, Washington, DC 20005.Copyright 2015 American Petroleum Instituteiii Foreword This edition of API Specification 5LC supersedes the Third Edition a
11、nd includes items approved by letter ballot through January 2014. Portions of this publication have been changed from the previous edition. Substantive changes are indicated with gray shading and blue font, but API makes no warranty as to the accuracy of such notations. Nonsubstantive changes will n
12、ot be indicated with shading and colored font. Nothing contained in any API publication is to be construed as granting any right, by implication or otherwise, for the manufacture, sale, or use of any method, apparatus, or product covered by letters patent. Neither should anything contained in the pu
13、blication be construed as insuring anyone against liability for infringement of letters patent. The verbal forms used to express the provisions in this recommended practice are as follows: the term “shall” denotes a minimum requirement in order to conform to the recommended practice; the term “shoul
14、d” denotes a recommendation or that which is advised but not required in order to conform to the recommended practice; the term “may” is used to express permission or a provision that is optional; and the term “can” is used to express possibility or capability. This document was produced under API s
15、tandardization procedures that ensure appropriate notification and participation in the developmental process and is designated as an API standard. Questions concerning the interpretation of the content of this publication or comments and questions concerning the procedures under which this publicat
16、ion was developed should be directed in writing to the Director of Standards, American Petroleum Institute, 1220 L Street, NW, Washington, DC 20005. Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the director. Generally,
17、 API standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. A one-time extension of up to two years may be added to this review cycle. Status of the publication can be ascertained from the API Standards Department, telephone (202) 682-8000. A catalog of API publicati
18、ons and materials is published annually by API, 1220 L Street, NW, Washington, DC 20005. Suggested revisions are invited and should be submitted to the Standards Department, API, 1220 L Street, NW, Washington, DC 20005, standardsapi.org. iv Suggestions for Ordering API CRA Line Pipe In placing order
19、s for line pipe to be manufactured in accordance with API Specification 5LC, the purchaser should specify the following on the purchase order: Specification API Spec 5LC Quantity Grade. Tables 4 and 7 Type of Pipe Section 4.1 c) Size Nominal Diameter: Standard-weight Plain-end Pipe . Table 12 Extra-
20、strong Plain-end Pipe Table 12 Double-extra-strong Plain-end Pipe . Table 12 Outside Diameter: Regular-weight Plain-end Pipe . Table 12 Special Plain-end Pipe Table 12 Weight per Foot or Wall Thickness . Table 12 Nominal Length Section 10.5 End Finish Section 10 Delivery Date and Shipping Instructio
21、ns The purchaser should also state on the purchase order their requirements concerning the following stipulations, which are optional with the purchaser: Certificate of Compliance . Section 1.5 Chemical Analysis Test Reports Section 6.5 Acceptance and Maximum Allowable Percent of Jointers Section 10
22、.7 Alternative Bevel, Plain-end Pipe in Sizes 23/8in. OD and larger . Section 10.8 Defect Repair Procedures Sections 12.7, 12.8, 12.9 Markings in Metric Units . Section 13.1 b) Purchaser Inspection Annex G Monogram Marking * Annex A, Section A.4 * Users of this specification should note that there i
23、s no longer a requirement for marking a product with the API monogram. The American Petroleum Institute continues to license use of the monogram on products covered by this specification but it is administered by the staff of the Institute separately from the specification. The policy describing lic
24、ensing and use of the monogram is contained in Annex A. No other use of the monogram is permitted. Nonlicensees may mark products in conformance with Section 13 and licensees may mark products in conformance with Annex A or Section 13. Attention is called to the following stipulations which are subj
25、ect to agreement between the purchaser and the manufacturer: Chemical Composition Section 6.1 Intermediate Grades . Section 7.1, Table D.1 Flattening Test Orientation . Section 7.9 Intermediate Diameters Section 10.2 Intermediate Wall Thickness Section 10.3 Supplementary Requirements Annex B Supplem
26、entary Hydrostatic Test Section 9.4 Hydrostatic Test Pressure Section 9.3 Lengths Applied to Carloads Table 16 Nonstandard Length and Length Tolerances Section 10.5 Repair of Welds of Electric-welded Pipe Section 12.7 b) Marking Requirements . Sections 13.1, 13.4, 13.5 v Contents page 1 Scope . 1 Co
27、verage . 1 1.1Application of the API Monogram . 1 1.22 Normative References 1 3 Terms, Definitions, and Abbreviations . 2 Terms and Definitions 2 3.1Abbreviations 3 3.24 General Information 3 Metric Units . 3 4.1Measuring Devices . 4 4.2Special Processes 4 4.3Certification . 4 4.4Retention of Record
28、s . 5 4.55 Process of Manufacture and Material . 5 Process of Manufacture . 5 5.1Cold Expansion . 7 5.2Heat Treatment 8 5.3Traceability 8 5.4Hydrogen Sulfide Environments . 8 5.56 Chemical Properties and Tests . 8 Composition 8 6.1Heat Analyses . 8 6.2Product Analyses . 10 6.3Recheck Analyses 10 6.4
29、Control Analyses 10 6.5Chemical Analyses Procedures 10 6.67 Mechanical Properties and Tests 11 Tensile TestsGeneral 11 7.1Tensile Testing 15 7.2Longitudinal Tensile Tests 15 7.3Transverse Tensile Tests . 15 7.4Weld Tensile Tests . 16 7.5Control Tensile Tests . 16 7.6RetestsTensile Tests 16 7.7Defect
30、ive SpecimensTensile Tests . 16 7.8Flattening TestsElectric Weld 16 7.9Acceptance CriteriaFlattening Tests . 17 7.10RetestsFlattening Tests 17 7.11Flattening TestsSeamless, Centrifugally Cast, and Welded Without Filler Metal 18 7.12Weld With Filler Metal Manipulation Tests . 19 7.13Guided-Bend Test
31、. 19 7.14RetestsGuided-bend Test . 19 7.15Weld Ductility Test for Electric-welded Pipe 20 7.16vi RetestsWeld Ductility Test . 22 7.17Centrifugally Cast Homogeneity Test . 22 7.18Hardness Tests (LC52-1200) 24 7.198 Special Tests . 24 Ferrite/Austenite Ratio for Duplex Stainless Steel 24 8.1Intergranu
32、lar Corrosion Test (Strauss Test) 25 8.29 Hydrostatic Tests 26 Inspection Hydrostatic Test . 26 9.1Verification of Test 26 9.2Test Pressures 26 9.3Supplementary Hydrostatic Tests . 39 9.410 Dimensions, Weights, and Lengths 39 Dimensions and Weights . 39 10.1Diameter . 40 10.2Wall Thickness 40 10.3We
33、ight 41 10.4Length 41 10.5Straightness 41 10.6Jointers 41 10.7Pipe Ends . 43 10.811 Nondestructive Inspection . 44 Inspection Methods for Welded Pipe 44 11.1Inspection Methods for Seamless Pipe 44 11.2Inspection Methods for Centrifugally Cast Pipe 44 11.3Radiological Inspection Equipment 44 11.4Fluo
34、roscopic Operator Qualification 44 11.5Operator Certification . 45 11.6Reference Standard 45 11.7ISO Wire Penetrameter . 45 11.8Frequency 46 11.9Procedure for Evaluating In-Motion Operation of the Fluoroscope 46 11.10Acceptance Limits 46 11.11Imperfections 46 11.12Defects . 46 11.13Weld Repair . 49
35、11.14Ultrasonic and Electromagnetic Inspection of Welded Pipe 49 11.15Ultrasonic and Electromagnetic Inspection of Seamless Pipe 51 11.16Ultrasonic Inspection of Centrifugally Cast Pipe 52 11.1712 Workmanship, Visual Inspection, and Repair of Defects . 52 Inspection Notice 52 12.1Purchaser Inspectio
36、n . 53 12.2Workmanship 53 12.3Visual Inspection 54 12.4Defects . 54 12.5Repair of Defects 55 12.6Procedure for Repair of Weld Seams of Submerged Arc Welded Pipe 56 12.7Procedure for Repair of Weld Seams of Electric-weld and Induction-welded Pipe . 56 12.8vii Procedure for Repair of Weld Seam of Gas
37、Metal Arc Welded Pipe . 56 12.913 Marking and Surface Treatment 57 MarkingGeneral . 57 13.1Location of Markings 57 13.2Sequence of Markings 57 13.3Length 58 13.4Die Stamping . 59 13.5Surface Treatment 59 13.6Pipe Processor Markings . 59 13.7Annex A API Monogram Program, Use of the API Monogram by Li
38、censees 60 Annex B Supplementary Requirement(s) 64 Annex C Repair Welding Procedure . 65 Annex D Minimum Elongation Values 72 Annex E Guided-bend Test Jig Dimensions . 75 Annex F Metric Tables . 86 Annex G Purchaser Inspection . 109 Figures 1 Orientation of Tensile Test Specimens 13 2 Tensile Test S
39、pecimens . 14 3 Flattening Tests 17 4 Guided-bend Test Specimen . 20 5 Jig for Guided-bend Test . 21 6 Through-wall Hardness Test Locations . 23 7 Location for Determination of Through-wall Ferrite/Austenite Ratio . 24 8 Examples of Maximum Distribution Patterns of Indicated Circular Slag-inclusion-
40、and Gas-pocket-type Discontinuities 47 9 Examples of Maximum Distribution Patterns of Indicated Elongated Slag-inclusion-type Discontinuities 49 10 Reference Standards . 50 11 Reference Standard . 51 C.1 Transverse Tensile Test Specimen 67 C.2 Tensile-elongation Test Specimen . 68 C.3 Guided-bend Te
41、st Specimen . 68 C.4 Jig for Guided-bend Test . 69 C.5 Nick-break Test Specimen . 70 Tables 1 Special Processes for Manufacturing Conditions 4 2 Retention of Records . 5 3 Pipe Manufacturing Processes. 7 4 Chemical Requirements for Heat Analyses, Percent (%) 9 5 Purchaser Provided Analysis . 10 viii
42、 6 Permissible Variation for Product Analyses of CRA Line Pipe . 11 7 Tensile Requirements 12 8 Frequency of Tensile Testing . 15 9 Flattening Retests 18 10 Specimen Lot Test Lengths 22 11 Quadrant Hardness Readings . 23 12 Plain-end Line Pipe Dimensions, Weights, and Test Pressures (See Annex F for
43、 Metric Tables) 27 13 Test Pressure for Size Ranges in All Grades 39 14 Correction Factors . 40 15 Tolerance on Dimensions and Weights . 42 16 Tolerances on Lengths 43 17 Taper Angle . 43 18 ISO Wire Penetrameter (Sensitivity 2 %) . 45 19 Elongated Slag-inclusion-type Discontinuities(See Figure 9) 4
44、8 20 Circular Slag-inclusion- and Gas-pocket-type Discontinuities(See Figure 9) 48 21 Acceptance Limits . 51 22 Outside/Inside Weld Bead Height (Except ERW) 53 23 Electric-Welded Pipe Inside Flash Trim . 54 24 Applicable Repair Procedure 55 C.1 Guided-bend Test Jig Dimensions (See Figure C.4) 69 D.1
45、 Minimum Elongation Values . 72 E.1 Guided-bend Test Jig Dimensions . 75 F.1 Metric Dimensions, Weights, and Test Pressures 86 1 CRA Line Pipe 1 Scope Coverage 1.1This specification covers seamless, centrifugal cast, and welded alloy line pipe with improved corrosion resistant properties. The purpos
46、e of this specification is to provide standards for pipe with improved corrosion resistance suitable for use in conveying gas, water, and oil in both the oil and natural gas industries. The size designations are nominal pipe sizes (NPS). In the text paragraphs herein, where pipe size limits (or size
47、 ranges) are given, these are outside diameter sizes except where stated to be nominal. These outside diameter size limits and ranges apply also to the corresponding nominal sizes. The primary product is beveled pipe. If plain-end square cut or other special end preparation is desired, this shall be
48、 subject to agreement between the purchaser and manufacturer. Included are NPS 1 in. through 42 in. Grades covered by this specification are LC30-1812, LC52-1200, LC65-2205, LC65-2506, LC30-2242, and LC80-2507 1. Application of the API Monogram 1.2If product is manufactured at a facility licensed by
49、 API and it is intended to be supplied bearing the API Monogram, the requirements of Annex A apply. 2 Normative References For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. For a list of other documents and articles associated with this standard, please see the Bibliography. The following referenced documents, either referenced in full or in part, are indispensable for the application of this document. API Specification 5L, Specification for Line Pipe API Specifi
