CGA-P-26-1997-R2003.pdf
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1、 CGA P-261997 (Formerly TB-2) GUIDELINES FOR INSPECTION AND REPAIR OF MC-330 AND MC-331 ANHYDROUS AMMONIA CARGO TANKS FIFTH EDITION REAFFIRMED 2003 COMPRESSED GAS ASSOCIATION, INC. 4221 Walney Road, 5th Floor Chantilly, VA 20151 Phone: 703-788-2700 Fax: 703-961-1831 E-mail: PAGE ii COMPRESSED GAS A
2、SSOCIATION, INC. CGA P-261997 PLEASE NOTE: The information contained in this document was obtained from sources believed to be reliable and is based on technical information and experience currently available from members of the Compressed Gas Association, Inc. and others. However, the Association o
3、r its members, jointly or severally, make no guarantee of the results and assume no liability or responsibility in connection with the information or suggestions herein contained. Moreover, it should not be assumed that every acceptable commodity grade, test or safety procedure or method, precaution
4、, equipment or device is contained within, or that abnormal or unusual circumstances may not warrant or suggest further requirements or additional procedure. This document is subject to periodic review, and users are cautioned to obtain the latest edition. The Associa- tion invites comments and sugg
5、estions for consideration. In connection with such review, any such comments or suggestions will be fully reviewed by the Association after giving the party, upon request, a reasonable op- portunity to be heard. Proposed changes may be submitted via the Internet at our web site, . This document shou
6、ld not be confused with Federal, state, provincial, or municipal specifications or regulations; insurance requirements; or national safety codes. While the Association recommends reference to or use of this document by government agencies and others, this document is purely voluntary and not binding
7、. A listing of all publications, audiovisual programs, safety and technical bulletins, and safety posters is available via the Internet at our website at . For more information contact CGA at Phone: 703-788-2700, ext. 799. E-mail: . Docket 03-13 Bulk Distribution Equipment and Standards Committee NO
8、TETechnical changes from the previous edition are underlined. NOTEThis reaffirmed edition may include minor editorial changes; however, all technical information is the same as the 1997 edition. REAFFIRMED: 2003 FIFTH EDITION: 1997 FOURTH EDITION: 1989 THIRD EDITION: 1980 SECOND EDITION: 1975 1997 B
9、Y THE COMPRESSED GAS ASSOCIATION INC. ALL RIGHTS RESERVED. 4221 WALNEY ROAD, 5TH FLOOR, CHANTILLY, VA 20151 Printed in U.S.A. -,-,- CGA P-261997 COMPRESSED GAS ASSOCIATION, INC. PAGE iii Contents Page 1 Introduction.1 2 Inspection.1 3 Repair.2 4 Preparations prior to cargo tank entry, inspection, an
10、d repair3 5 Suggested inspection procedure4 6 Personnel health, safety, and training5 7 References.6 8 Additional source of information.6 -,-,- This page is intentionally blank. CGA P-261997 COMPRESSED GAS ASSOCIATION, INC. PAGE 1 1 Introduction 1.1 The U.S. Department of Transportation (DOT) Hazard
11、ous Materials Regulations in Title 49 of the U.S. Code of Federal Regulations (49 CFR) 180.407(g)(3) require that MC-330 and MC-331 anhydrous ammonia cargo tanks that are constructed of quenched and tempered steel or constructed of other than quenched and tem- pered steel but without post-weld heat
12、treatment be internally inspected by the wet fluorescent magnetic parti- cle method at certain prescribed intervals. Cracks and other defects found during the inspection shall be re- paired in accordance with the requirements in 49 CFR Part 180, Subpart E, “Qualification and Maintenance of Cargo Tan
13、ks,” if a cargo tank is to be returned to transportation service 1.1 1.2 In order to promote uniformity within the industry, the Compressed Gas Association (CGA) has prepared these guidelines for use by personnel having responsibility for the inspection and repair of these cargo tanks. 2 Inspection
14、2.1 The wet fluorescent magnetic particle method shall be used, and the test procedure shall be in accordance with the applicable portions of Section V of the ASME Code 2. The alternating current yoke method shall be used. 2.2 The surfaces to be inspected shall be cleaned to remove oil, loose scale,
15、 and rust. All of these materials shall be removed from surfaces with sufficient care to clean crevices and corners so that the test solution will flow freely. Failure to do this will result in erroneous indications or the masking of indications. Care should be exer- cised to magnetize each area in
16、directions that would cross any crack regardless of the cracks orientation. Yokes should be positioned to effectively overlap magnetized areas. The speed of inspection should be slow enough to allow particle buildup at cracks. The continuous method of inspection should be used so that current and te
17、st solution are flowing while the inspection is being made with the black light. Visible light should be eliminated entirely or kept at a level that does not appreciably lessen the fluorescent image. Fluorescent mate- rials should be mixed according to the recommendations of the manufacturer and sho
18、uld be agitated frequently during use. Black light output diminishes with use and should be checked periodically with a light meter accord- ing to the recommendations of the fluorescent materials manufacturer. 2.3 The wet fluorescent magnetic particle inspection shall include: all welds in or on the
19、 interior surface of the tank, and the adjacent base plate extending 2 in (5 cm) from either side of such welds; the entire interior surface of tank heads; and all interior surfaces at least 2 in (5 cm) in all directions from exterior welds that are visibly discernible on the interior of the tank. I
20、n addition, the entire interior surface of the tank should be visually inspected, and any areas showing evidence of grinding or other repairs or disturbances of the plate surface should be inspected by the wet fluorescent magnetic particle method. If any cracks are found, the entire interior surface
21、 shall also be inspected. 1 References are shown by bracketed numbers and are listed in order of appearance in the reference section. -,-,- PAGE 2 COMPRESSED GAS ASSOCIATION, INC. CGA P-261997 3 Repair 3.1 All cracks and other defects, except porosity and slag inclusions in the weld deposit that are
22、 acceptable under the ASME Code, Section VIII, Division I, shall be removed or repaired 3. The removal and repair procedures employed shall comply with those contained in the latest edition and addenda of the National Board Inspection Code 4. Where specific procedures are not given, it is intended t
23、hat subject to the approval of the inspector, all repairs shall conform insofar as possible to the ASME Code most applicable to the best performance of the work planned 5. The construction standard selected shall be the one considered by the inspector as the most compatible with the nature of the re
24、pair and the conditions of original construction. Before proceeding with any welded repairs, the repair facility should have a copy of the Manufacturers Data Report, Form U1 or U1A. 3.2 Some minor cracks and other defects may be removed by grinding. In no case shall grinding be done that would reduc
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