《DEP 31.24.49.31-Gen.pdf》由会员分享，可在线阅读，更多相关《DEP 31.24.49.31-Gen.pdf（14页珍藏版）》请在三一文库上搜索。
1、TECHNICAL SPECIFICATION SHOP FABRICATION OF HEATER PIPING DEP 31.24.49.31-Gen. July 1993 DESIGN AND ENGINEERING PRACTICE USED BY COMPANIES OF THE ROYAL DUTCH/SHELL GROUP This document is confidential. Neither the whole nor any part of this document may be disclosed to any third party without the pri
2、or written consent of Shell Internationale Petroleum Maatschappij B.V., The Hague, the Netherlands. The copyright of this document is vested in Shell Internationale Petroleum Maatschappij B.V., The Hague, the Netherlands. All rights reserved. Neither the whole nor any part of this document may be re
3、produced, stored in any retrieval system or transmitted in any form or by any means (electronic, mechanical, reprographic, recording or otherwise) without the prior written consent of the copyright owner. PREFACE DEP (Design and Engineering Practice) publications reflect the views, at the time of pu
4、blication, of: Shell International Oil Products B.V. (SIOP) and Shell International Exploration and Production B.V. (SIEP) and Shell International Chemicals B.V. (SIC) The Hague, The Netherlands, and other Service Companies. They are based on the experience acquired during their involvement with the
5、 design, construction, operation and maintenance of processing units and facilities, and they are supplemented with the experience of Group Operating companies. Where appropriate they are based on, or reference is made to, national and international standards and codes of practice. The objective is
6、to set the recommended standard for good design and engineering practice applied by Group companies operating an oil refinery, gas handling installation, chemical plant, oil and gas production facility, or any other such facility, and thereby to achieve maximum technical and economic benefit from st
7、andardization. The information set forth in these publications is provided to users for their consideration and decision to implement. This is of particular importance where DEPs may not cover every requirement or diversity of condition at each locality. The system of DEPs is expected to be sufficie
8、ntly flexible to allow individual operating companies to adapt the information set forth in DEPs to their own environment and requirements. When Contractors or Manufacturers/Suppliers use DEPs they shall be solely responsible for the quality of work and the attainment of the required design and engi
9、neering standards. In particular, for those requirements not specifically covered, the Principal will expect them to follow those design and engineering practices which will achieve the same level of integrity as reflected in the DEPs. If in doubt, the Contractor or Manufacturer/Supplier shall, with
10、out detracting from his own responsibility, consult the Principal or its technical advisor. The right to use DEPs is granted by SIOP, SIEP or SIC, in most cases under Service Agreements primarily with companies of the Royal Dutch/Shell Group and other companies receiving technical advice and service
11、s from SIOP, SIEP or SIC. Consequently, three categories of users of DEPs can be distinguished: 1)Operating companies having a Service Agreement with SIOP, SIEP, SIC or other Service Company. The use of DEPs by these Operating companies is subject in all respects to the terms and conditions of the r
12、elevant Service Agreement. 2)Other parties who are authorized to use DEPs subject to appropriate contractual arrangements. 3)Contractors/subcontractors and Manufacturers/Suppliers under a contract with users referred to under 1) or 2) which requires that tenders for projects, materials supplied or -
13、 generally - work performed on behalf of the said users comply with the relevant standards. Subject to any particular terms and conditions as may be set forth in specific agreements with users, SIOP, SIEP and SIC disclaim any liability of whatsoever nature for any damage (including injury or death)
14、suffered by any company or person whomsoever as a result of or in connection with the use, application or implementation of any DEP, combination of DEPs or any part thereof. The benefit of this disclaimer shall inure in all respects to SIOP, SIEP, SIC and/or any company affiliated to these companies
15、 that may issue DEPs or require the use of DEPs. Without prejudice to any specific terms in respect of confidentiality under relevant contractual arrangements, DEPs shall not, without the prior written consent of SIOP and SIEP, be disclosed by users to any company or person whomsoever and the DEPs s
16、hall be used exclusively for the purpose for which they have been provided to the user. They shall be returned after use, including any copies which shall only be made by users with the express prior written consent of SIOP and SIEP. The copyright of DEPs vests in SIOP and SIEP. Users shall arrange
17、for DEPs to be held in safe custody and SIOP or SIEP may at any time require information satisfactory to them in order to ascertain how users implement this requirement. All administrative queries should be directed to the DEP Administrator in SIOP. NOTE: In addition to DEP publications there are St
18、andard Specifications and Draft DEPs for Development (DDDs). DDDs generally introduce new procedures or techniques that will probably need updating as further experience develops during their use. The above requirements for distribution and use of DEPs are also applicable to Standard Specifications
19、and DDDs. Standard Specifications and DDDs will gradually be replaced by DEPs. DEP 31.24.49.31-Gen. July 1993 Page 2 TABLE OF CONTENTS 1.INTRODUCTION.4 1.2DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS4 1.3DEFINITIONS 4 1.4CROSS-REFERENCES4 2.DOCUMENTS.5 3.FABRICATION REQUIREMENTS6 3.1MATE
20、RIALS 6 3.2CUTTING AND BEVELLING.6 3.3WELDED JOINT6 3.4FLANGED JOINTS7 3.5SPACER STRIPS7 3.6BENDS. 7 3.7FINAL CORRECTIONS.7 3.8TOLERANCES8 4.WELDING 9 4.1GENERAL 9 4.2PREHEATING.9 4.3POST-WELD HEAT TREATMENT.9 5.SHOP INSPECTION AND TESTING10 5.1INSPECTION OF WELDS.10 5.2HYDROSTATIC PRESSURE TEST10 5
21、.3HARDNESS REQUIREMENTS.10 5.4POSITIVE MATERIAL IDENTIFICATION.10 5.5TUBE FINNING.10 6.REFERENCES11 7.APPENDICES13 APPENDICES APPENDIX 1PREHEAT AND PWHT TEMPERATURES.14 APPENDIX 2INSPECTION CLASSES FOR PIPING15 DEP 31.24.49.31-Gen. July 1993 Page 3 1.INTRODUCTION This DEP is a revision of the earlie
22、r DEP of the same number and title dated April 1981. This DEP gives minimum requirements for the fabrication, inspection and testing of carbon steel, alloy steel and stainless steel piping (coils) to be used in fired equipment and waste heat boilers. The requirements also apply to field work on thes
23、e coils. Where applicable, the words “piping“ and “pipe(s)“ used in this DEP shall also mean “tubing“ and “tube(s)“, respectively. 1.2DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS Unless otherwise authorised by SIPM, the distribution of this DEP is confined to companies forming part of th
24、e Royal Dutch/Shell Group or managed by a Group company, and to Contractors and Manufacturers/Suppliers nominated by them (i.e. the distribution code is “F“, as described in DEP 00.00.05.05-Gen.). This DEP is intended primarily for use in oil refineries, chemical plants, gas plants and, where applic
25、able, in exploration and production and supply/marketing installations. If national and/or local regulations exist in which some of the requirements may be more stringent than in this DEP, the Contractor shall determine by careful scrutiny which of the requirements are the more stringent and which c
26、ombination of requirements will be acceptable as regards safety, environmental, economic and legal aspects. In all cases the Contractor shall inform the Principal of any deviation from the requirements of this DEP which is considered to be necessary in order to comply with national and/or local regu
27、lations. The Principal may then negotiate with the Authorities concerned with the object of obtaining agreement to follow this DEP as closely as possible. 1.3DEFINITIONS 1.3.1General definitions The Contractor is the party which carries out all or part of the design, engineering, procurement, constr
28、uction, commissioning or management of a project or operation of a facility. The Principal may undertake all or part of the duties of the Contractor. The Manufacturer/Supplier is the party which manufactures or supplies equipment and services to perform the duties specified by the Contractor. The Pr
29、incipal is the party which initiates the project and ultimately pays for its design and construction. The Principal will generally specify the technical requirements. The Principal may also include an agent or consultant authorised to act for, and on behalf of, the Principal. The word shall indicate
30、s a requirement. The word should indicates a recommendation. 1.3.2Specific definitions Design code is ANSI B 31.1 unless otherwise specified by the Principal. 1.4CROSS-REFERENCES Where cross references are made in this DEP, the number of the section or sub-section referred to is shown in brackets. A
31、ll publications referred to are listed in (6). DEP 31.24.49.31-Gen. July 1993 Page 4 2.DOCUMENTS The Supplier shall be provided by the Principal with one or more drawings together with covering requisition(s) giving all information on the coils to be fabricated. In addition to the data stated on the
32、se drawing(s), shop drawings provided by the Supplier shall state: -Details of the welded joints with reference to the welding procedure specification, pre- and post-weld heat treatment procedures. Before the start of manufacture, all shop drawings, weld procedure specifications including pre- and p
33、ost-weld treatment procedures, welding procedure qualification records and welder performance qualifications shall have been approved by the Principal. Manufacture shall be in conformity with these approved drawings. The Manufacturer shall, upon completion, supply a manufacturing report containing a
34、ll the relevant documentation. Theformat for this report should be in accordance with DEP 31.22.10.35-Gen., making use of all the applicable sections. DEP 31.24.49.31-Gen. July 1993 Page 5 3.FABRICATION REQUIREMENTS 3.1MATERIALS 3.1.1General The material shall comply with the specification as given
35、on the drawing and/or requisition. Unless otherwise specified, only seamless pipe and fittings shall be used. Materials shall be in accordance with DEP 30.10.02.11-Gen. 3.1.2Material certification All materials used in pressure-containing parts and in load-bearing components shall be traceable to ma
36、terial test certificates ISO 10474 type 5.1.B or 5.1.C. For low-alloy steels, high-alloy martensitic, ferritic and austenitic stainless steels, and carbon steels requiring notch toughness (as per DEP 30.10.02.31-Gen.) traceable material certificates according to type 5.1 C shall be provided (includi
37、ng welding consumables). 3.1.3Traceability The heat number(s) for certified materials (see 3.1.2) shall be recorded on an as-built drawing of the heater piping. 3.2CUTTING AND BEVELLING 3.2.1General Cutting of pipes may be done either by mechanical or thermal (flame, arc or plasma) means. The follow
38、ing shall be taken into account for thermal cutting: -For carbon steel, thermal cutting and bevelling may be used only if the cut is reasonably smooth and all oxides are removed from the surface. This shall be achieved by dressing back approximately 2 mm by grinding or machining to remove all the he
39、at affected zone. -For low- and intermediate-alloy steel, thermal cutting may be used only where machining or water cutting is not feasible. After thermal cutting, approximately 2 mm of material shall be removed from the surface of the bevel by grinding or machining. The dressed bevels then shall be
40、 examined by either magnetic particle or dye penetrant methods prior to welding, to confirm that the bevel is free from linear indications. -Stainless steel piping shall not be flame or arc cut. Plasma cutting may be applied. If preheat is specified for welding, the same preheat shall be applied for
41、 thermal cutting. 3.2.2End preparation for butt-welding End preparations for butt-welding shall be in accordance with ANSI B16.25. Pipes having a wall thickness of less than 3 mm shall be cut square. 3.3WELDED JOINT The type of flanges, fittings and connections and the extent to which welded joints
42、are applied shall be indicated on the Principals drawings. No intermediate welds shall be made in the pipes used for the coils, unless approved by the Principal. All branch welds and structural attachment welds shall be dressed to a reasonably smooth finish, free from undercut and merging smoothly i
43、nto the pipe surface, and without any sharp corners or other stress raisers. Backing rings shall not be used. DEP 31.24.49.31-Gen. July 1993 Page 6 3.3.1Assembly End profiles of pipes and fittings to be butt-welded shall be in accordance with (3.2.2). For butt-welding of all piping components, a uni
44、form root gap shall be used as specified below: Nominal pipe sizeRoot opening smaller than DN501.5 mm DN50-DN2501.5 - 2.5 mm DN350 and larger2.5 - 3.5 mm Alignment of butt-welded piping components shall be in accordance with ANSI B31.1 with the exception that the internal trimming shall be 1 : 4 ins
45、tead of 30. 3.3.2Branch connections All cuts shall be carefully bevelled and accurately matched to form a suitable groove for welding and to permit complete penetration of the welds at all points. 3.4FLANGED JOINTS Unless otherwise stated on the Principals drawing, the bolt holes of all flanges shal
46、l straddle the centre lines of the pipe ends. Slip-on or socket weld flanges shall not be used. 3.5SPACER STRIPS The weld connecting the spacer strip and the pipe shall have full penetration as indicated on the Principals drawing. Material of these strips shall be the same as of the pipes concerned.
47、 3.6BENDS Only welding elbows in accordance with ANSI B16.9 shall be used. Bending of pipe may be done only with the approval of the Principal regarding the location(s),method(s)ofbending,finalheattreatmentcondition,tolerancesand subsequent inspection methods. 3.7FINAL CORRECTIONS 3.7.1General If fi
48、nal corrections cannot be avoided they shall be carried out as much as possible by rewelding. Where cold work is unavoidable, hardness testing on the strained area shall be carried out to confirm the maximum hardness requirements of (5.3) are met. For cold deformation greater than 5% or where the ma
49、ximum hardness requirements are exceeded, thermal stress relief shall be applied (with correctly fabricated pipework, it is not the intention that 5% cold deformation should ever be reached or undue stress be imposed on the system during installation). In all cases the Principal shall be informed beforehand. The following requirements shall also apply. 3.7.2Carbon steel, 0.3 Mo and 0.5 Mo steel piping After final heat treatment all corrections to the piping should be made in the cold condition. DEP 31.24.49.31-Gen. July 1993 Page 7 3.7.3Chromium-molybdenum steel piping After final heat tre