《DEP 80.00.10.10-Gen.pdf》由会员分享，可在线阅读，更多相关《DEP 80.00.10.10-Gen.pdf（13页珍藏版）》请在三一文库上搜索。
1、MANUAL AREA CLASSIFICATION (AMENDMENTS/SUPPLEMENTS TO IP 15) DEP 80.00.10.10-Gen. December 1995 DESIGN AND ENGINEERING PRACTICE This document is confidential. Neither the whole nor any part of this document may be disclosed to any third party without the prior written consent of Shell International
2、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 reproduced, stored in any retrieval system or transmitted in
3、 any form or by any means (electronic, mechanical, reprographic, recording or otherwise) without the prior written consent of the copyright owners. PDF created with pdfFactory Pro trial version PREFACE DEP (Design and Engineering Practice) publications reflect the views, at the time of publication,
4、 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 involvementwith the design, co
5、nstruction, 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 to set the
6、recommendedstandard for good design and engineeringpractice 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 standardization
7、. 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 sufficiently flexible
8、 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 engineering stand
9、ards. 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, without detractin
10、g 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 services from SIOP,
11、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 relevant Servi
12、ce 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 - generally -
13、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) suffered by a
14、ny 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 that may iss
15、ue 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 shall be used
16、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 for DEPs to b
17、e 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 Standard Specif
18、ications 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 and DDDs. Sta
19、ndard Specifications and DDDs will gradually be replaced by DEPs. DEP 80.00.10.10-Gen. December 1995 Page 2 PDF created with pdfFactory Pro trial version TABLE OF CONTENTS PART IINTRODUCTION .4 1.1SCOPE 4 1.2DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS4 1.3DEFINITIONS 4 1.4ABBREVIATIONS
20、 4 1.5CROSS-REFERENCES 4 PART IIGENERAL CONSIDERATIONS 5 1.INTRODUCTION .5 2.APPLICABILITY OF IP 15 .5 3.ADMINISTRATIVE ASPECTS.5 PART IIIAMENDMENTS AND SUPPLEMENTS TO IP 15 .6 PART IVREFERENCES 12 DEP 80.00.10.10-Gen. December 1995 Page 3 PDF created with pdfFactory Pro trial version PART IINTRODU
21、CTION 1.1SCOPE This DEP specifies requirements and recommends practices for the determination of hazardous areas in facilities handling flammable fluids. It is based on the Institute of Petroleum Model Code of Safe Practice, Part 15, Area Classification Code for Petroleum Installations, 1990 (IP 15)
22、. Part III of this DEP amends and supplements specific clauses of IP 15. 1.2DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS Unless otherwise authorised by SIOP and SIEP, the distribution of this DEP is confined to companies forming part of the Royal Dutch/Shell Group or managed by a Group c
23、ompany, and to Contractors nominated by them (i.e. the distribution code is “C“ as described in DEP 00.00.05.05-Gen.). This DEP is intended for use in oil refineries, gas plants, chemical plants, oil and gas production facilities, and supply/marketing installations. If national and/or local regulati
24、ons 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 combination of requirements will be acceptable as regards safety, environmental, economic and legal aspect
25、s. In all cases, the user 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 regulations. The Principal may then negotiate with the Authorities concerned with the object of obtaining agreeme
26、nt to follow this DEP as closely as possible. 1.3DEFINITIONS 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 or maintenance of a facility. The Principal may undertake all or part o
27、f the duties of 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 include an agent or consultant authorised to act for, and on behalf of, the P
28、rincipal. The word shall indicates a requirement. The word should indicates a recommendation. 1.4ABBREVIATIONS ANSI-American National Standards Institute IP 15-Institute of Petroleum Model Code of Safe Practice, Part 15, March 1990 1.5CROSS-REFERENCES Where cross-references to other parts of this DE
29、P are made, the referenced section number is shown in brackets. Other documents referenced in this DEP are listed in (Part IV). DEP 80.00.10.10-Gen. December 1995 Page 4 PDF created with pdfFactory Pro trial version PART II GENERAL CONSIDERATIONS 1.INTRODUCTION Area classification is the division o
30、f a plant or installation into hazardous areas and non- hazardous areas and the sub-division of hazardous areas into zones. This classification is based on the flammability of materials which may be present and the probability of a flammable atmosphere occurring. The classification provides a basis
31、for the selection and protection of electrical equipment appropriate to the defined areas and for the safe positioning of other potential or continuous sources of ignition, e.g. fired heaters, internal combustion engines, etc. It can be used also in the planning and control of hot work. Area classif
32、ication refers to normal operating conditions and does not apply to catastrophic situations such as the rupture of a process vessel or large diameter pipework. 2.APPLICABILITY OF IP 15 All new facilities that handle flammable fluids shall be classified in accordance with IP 15, as amended and supple
33、mented by section (3) of this DEP. Variations are allowed, provided that they are formally authorised by the Principal, and only if they achieve a similar level of safety. In areas where national codes are available, or codes other than IP 15 are commonly used (e.g. API RP500B), the codes should be
34、reviewed and supplemented where necessary. Installations which were operating at the date of issue of this DEP may be evaluated against this DEP, which provides current best practice. Any proposal for modification to an existing installation should be assessed on the basis of whether the benefits fr
35、om applying the DEP outweigh the implementation costs and risks. If it is intended to reclassify an existing installation on the basis of this DEP, reclassification should cover the whole installation and not just part of it. This is to avoid the application of multiple standards within the same ins
36、tallation. The area classification of facilities contracted for short duration, such as drilling rigs and mobile units, need not follow this DEP. Such facilities should be subject to a detailed technical safety review prior to use. The review should identify the necessary modifications and the range
37、 of permitted operations, so that the same level of protection is achieved as for permanent facilities. 3.ADMINISTRATIVE ASPECTS Each operating company should have a formal hazardous area classification committee with members drawn from process technology, engineering, operations, and technical safe
38、ty. Any modification to the hazardous area classification of an existing installation should be subject to a formal change procedure which should include endorsement by the committee; the objective is to ensure a common interpretation of the hazardous area code. DEP 80.00.10.10-Gen. December 1995 Pa
39、ge 5 PDF created with pdfFactory Pro trial version PART III AMENDMENTS AND SUPPLEMENTS TO IP 15 This section provides amendments and supplements to IP 15. Numbering of clauses in this section corresponds to the numbering in IP 15. Clauses of IP 15 which are not amended shall remain applicable as wr
40、itten. 1.INTRODUCTION 1.7.1Open Area Add to the existing clause: Open areas imply free access of the wind to at least two opposite sides. Obstructions such as dense trees, cliffs or other buildings preclude an area being considered “open“ unless it can be shown that the wind velocities meet the crit
41、eria above within that particular area. b2.THE TECHNIQUE OF HAZARDOUS AREA CLASSIFICATION 2.1INTRODUCTION Add to the existing clause: As a general rule, the process facilities should be designed such that no area has to be classified as Zone 0 and that the extent of Zone 1 is minimised. Exceptions t
42、o this rule include the area around a continuous vent, pits below grade and holding basins. Maximumemphasis should be placed on maintaining process containment, e.g. by minimising the number of small-bore fittings and ensuring appropriate condition monitoring of those fittings. 2.3.1Last line, repla
43、ce “ANSI/ASME B31.1“ by “ANSI/ASME B31.3“. 2.4 Add to the existing clause: During plant layout design, it is often desirable to group associated secondary grade sources closely together in such a way that the extent of the resulting Zone 2 area is minimised. An example is to group flanges at fixed l
44、ocations on a pipe rack. In so doing, it should be realised, however, that significant and multiple overlaps of Zone 2 areas may lead to Zone 1 classification, which is not desirable. The acceptable level of overlapping should be based on the definition of the secondary and primary releases given in
45、 1.5.5.2. 2.10.(f) Add to the existing clause: The vertical and horizontal extent of the hazardous area should be taken into account in the sizing of the firewall; enclosing the potential sources of release and ignition may be simpler. 2.10.(g) Add to the existing clause: Strict control should be ex
46、ercised over the quantity of flammable fluids within such locations. DEP 80.00.10.10-Gen. December 1995 Page 6 PDF created with pdfFactory Pro trial version 2.12.3Class II(1) or III(1) Add to the first paragraph of this clause: The conditions under which a Class II(1) or III(1) fluid can form a fla
47、mmable mist are not yet fully understood. Until more is known on this topic and when such fluids are under pressure, it is recommended that potential sources of release such as pump seals, flanges and valves are given a hazardous area classification the same as fluids in Class II(2) and III(2), or a
48、s category C fluids when using the individual point source method (see Chapter 5). Where spray guards are applied to these sources, such that any mist will coalesce and return to its non-hazardous liquid form, there is no requirement for a hazardous area. 2.15THE AREA CLASSIFICATION DRAWING Add to t
49、he existing clause: The area classification drawings shall be kept up-to-date, to take account of: -new or modified equipment; -changes in installation protection; -experience in operation of the installation; -changes in method or frequency of operations; -reclassification as a result of measurements in and around hazardous areas. 4.THE CLASSIFICATION OF DRILLING RIGS AND OTHER EQUIPMENT SYSTEMS USED IN WELL OPERATIONS AND PRODUCTION WELLHEAD AREAS 4.1.2.1Example of Typical Operational