《DEP 30.10.02.31-Gen.pdf》由会员分享,可在线阅读,更多相关《DEP 30.10.02.31-Gen.pdf(22页珍藏版)》请在三一文库上搜索。
1、TECHNICAL SPECIFICATION METALLIC MATERIALS - PREVENTION OF BRITTLE FRACTURE DEP 30.10.02.31-Gen. October 1995 (DEP Circular 42/97 has been incorporated) DESIGN AND ENGINEERING PRACTICE This document is confidential. Neither the whole nor any part of this document may be disclosed to any third party
2、without the prior written consent of Shell International Oil Products B.V. and Shell International Exploration and Production B.V., The Hague, The Netherlands. The copyright of this document is vested in these companies. All rights reserved. Neither the whole nor any part of this document may be rep
3、roduced, 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 owners. 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 30.10.02.31-Gen. October 1995 Page 2 TABLE OF CONTENTS 1.INTRODUCTION.4 1.1SCOPE 4 1.2DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS4 1.3DEFINITIONS 4 1.4CROSS-REFERENCES6 2.DESIGN CODES.7 3.GENERAL SELECTIO
20、N PROCEDURE.8 3.1SELECTION OF DESIGN CODE8 3.2DETERMINATION OF LOWER DESIGN TEMPERATURE.8 4.LOWER DESIGN TEMPERATURE FOR PRESSURE VESSELS.9 4.1PRESSURE VESSELS CONTAINING LIQUEFIED GAS.9 4.2PRESSURE VESSELS CONTAINING COMPRESSED FLAMMABLE LOW MOLECULAR WEIGHT GAS10 5.MATERIALS SELECTION FOR PRESSURE
21、 VESSELS.11 5.1PRESSURE VESSELS DESIGNED AND CONSTRUCTED IN ACCORDANCE WITH BS 5500 AND DEP 31.22.10.32-GEN11 5.2PRESSURE VESSELS DESIGNED AND CONSTRUCTED IN ACCORDANCE WITH ASME VIII DIVISION 1 AND 2 AND DEP 31.22.20.31-GEN13 6.PROCESS PIPING15 6.1DESIGN AND MATERIALS SELECTION.15 6.2LOWER DESIGN T
22、EMPERATURE15 6.3CARBON STEEL.15 6.4DUPLEX STAINLESS STEEL.15 7.ROTATING EQUIPMENT.16 7.1DESIGN AND MATERIALS SELECTION.16 7.2LOWER DESIGN TEMPERATURE FOR LIQUEFIED GAS.16 7.3LOWER DESIGN TEMPERATURE FOR COMPRESSED GAS18 8.REFERENCES21 DEP 30.10.02.31-Gen. October 1995 Page 3 1.INTRODUCTION 1.1SCOPE
23、Amended per Circular 42/97 This DEP, which is a revision of the previous DEP of the same number dated February 1987, specifies requirements and gives recommendations for the selection and application of materials in order to prevent brittle fracture. This DEP is applicable specifically for equipment
24、 containing: liquefied gas, compressed flammable low molecular weight gas, Guidelines are given for materials selection on the basis of the lower design temperature for: -unfired pressure vessels, -piping, piping components and valves (including control valves), -rotating equipment. This DEP is not
25、applicable to: -transmission pipelines, -vertical atmospheric storage tanks, -steel structures. This DEP shall only be used within the context of the relevant design and construction codes (see section 2). 1.2DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS Unless otherwise authorised by SIO
26、P and SIEP, the distribution of this DEP is confined to companies forming part of or managed by the Royal Dutch/Shell Group. It may be distributed to Manufacturers/Suppliers nominated by them (i.e. the distribution code is “F“, as defined in DEP 00.00.05.05-Gen.). This DEP is intended for use in oil
27、 refineries, chemical plants, gas plants, exploration and production facilities 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 req
28、uirements are the more stringent and which combination of requirements will be acceptable as regards safety, economic and legal aspects. In all cases the Contractor shall inform the Principal of any deviation from the requirements of this document which is considered to be necessary in order to comp
29、ly with national and/or local regulations. The Principal may then negotiate with the Authorities concerned with the object of obtaining agreement to follow this document as closely as possible. 1.3DEFINITIONS 1.3.1General definitions For the purpose of this DEP, the following definitions shall hold:
30、 The Contractor is the party which carries out all or part of the design, engineering, procurement, construction, 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
31、 manufactures or supplies equipment and services to perform the duties specified by the Contractor. The Principal 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 incl
32、ude an agent or consultant authorised to act for, and on behalf of, the DEP 30.10.02.31-Gen. October 1995 Page 4 Principal. The word shall indicates a requirement. The word should indicates a recommendation. 1.3.2Specific definitions Amended per Circular 42/97 Adiabatic flash temperature (AFT) is th
33、e lowest temperature which the liquid reaches if a mixture is adiabaticallydepressurized to atmospheric pressure. Atmospheric boiling point (ABP) is the temperature corresponding to an absolute vapour pressure of 1 bar of the product concerned. Equipment is any unfired vessel, column, heat exchanger
34、, pump, compressor, piping or part thereof under internal or external pressure. Steel structures, atmospheric vertical storage tanks and transmission pipelines are excluded from this definition. Flammable low molecular weight gas shall mean butanes and lighter. Liquefied gas shall mean a product whi
35、ch is gaseous at ambient temperature and atmospheric pressure, but is maintained in a liquid state by means of pressure or refrigeration, or a combination of the two. LODMAT shall mean Lowest One Day Mean Ambient Temperature. The LODMAT should be determined on the basis of meteorological data over a
36、s long a period as possible. In this connection one day is considered to cover the most unfavourable period of 24 hours. Temperature measurements should be carried out at least once per hour. Lower design temperature is the lowest temperature at which equipment may be subjected to its upper design p
37、ressure. However, for the purposes of selecting materials to prevent brittle fracture, the lower design temperature may be less than this value, as is described in the text of this DEP. LPG is liquefied petroleum gas. LTxx is a number which indicates a steel with a guaranteed impact value at a tempe
38、rature of minus xx C, see DEP 30.10.02.11-Gen. Membrane stress is the tensile component of the combination of primary local membrane stress and primary membrane stress Minimum metal temperature is the lowest temperature that equipment may possibly attain during operation, including start-up and shut
39、down. Operating temperature is the temperature which exists inside the equipment during the intended operation. Post Weld Heat Treatment (PWHT) is heat treatment carried out after welding with the aim to reduce residual stresses and to restore toughness properties after degradation by welding. Prima
40、ry local membrane stress is the membrane stress produced by pressure or other mechanical loading and associated with a primary and/or a discontinuity effect producing excessive distortion in the transfer of load to other portions of the structure (refer BS 5500, Appendix A). To establish the primary
41、 local membrane stress, all loadings shall be taken into account, such as internal and external pressures, static head, own weight and external sustained loads arising from connected piping including stresses due to thermal expansion. Primary membrane stress is the stress, generated by mechanical lo
42、ads, which is evenly distributed over the cross section. The basic characteristic of a primary stress is that it is not self-limiting (refer BS 5500, Appendix A). Thermal stress is the self-balancing stress produced by a non-uniform distribution of temperature or by differing thermal coefficients of
43、 expansion (refer BS 5500, Appendix A). DEP 30.10.02.31-Gen. October 1995 Page 5 1.4CROSS-REFERENCES Where cross-references to other parts of this DEP are made, the referenced section number is shown in brackets. Other documents referenced by this DEP are listed in (8). DEP 30.10.02.31-Gen. October
44、1995 Page 6 2.DESIGN CODES For pressure vessels, including heat exchangers, the design codes are: BS 5500 and DEP 31.22.10.32-Gen. ASME Section VIII and DEP 31.22.20.31-Gen. For piping systems, ANSI/ASME B31.3 and DEP 31.38.01.11-Gen. For rotating equipment, the following DEPs and, where applicable,
45、 the associated API standards shall be considered as the design codes: DEP 31.29.02.30-Gen.Centrifugal pumps DEP 31.29.06.30-Gen.Centrifugal submerged motor pumps in refrigerated product service DEP 31.29.12.30-Gen.Reciprocating positive displacement pumps and metering pumps DEP 31.29.40.30-Gen.Cent
46、rifugal compressors DEP 31.29.40.31-Gen.Reciprocating compressors DEP 31.29.40.32-Gen.Rotary-type compressors For equipment governed by standards and codes other than those defined above, the Contractor shall contact the Principal. DEP 30.10.02.31-Gen. October 1995 Page 7 3.GENERAL SELECTION PROCEDU
47、RE 3.1SELECTION OF DESIGN CODE Select from section 2 the applicable design code for the equipment under consideration. This DEP shall be used only within the context of these codes and their DEP amendments/supplements. 3.2DETERMINATION OF LOWER DESIGN TEMPERATURE Depressurization of equipment contai
48、ning liquefied gas or compressed low molecular weight gas will normally result in a temperature drop far below the operating temperature. Under such conditions, the operating temperature cannot be used for the determination of the lower design temperature. NOTE:Under certain conditions (e.g. sub-atm
49、ospheric operation, very low ambient temperatures, LODMAT) the operating temperature may be lower than the depressuring temperature; in that case this operating temperature becomes the lower design temperature. The following procedure shall be followed to arrive at the lower design temperature: (1)Determinethelowestmetaltemperaturebasedonprocessconditions,after depressurizing. (2)Determine the lower design temperature The selected lower design temperature depends on an engineering threshold value for the membrane stress in combination with the minimum metal temperature in relation to op
链接地址:https://www.31doc.com/p-3761732.html