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1、TECHNICAL SPECIFICATION SIDE-ENTRY MIXERS FOR STORAGE TANKS AND VESSELS DEP 31.51.10.31-Gen. December 1998 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 Int
2、ernational 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 tra
3、nsmitted 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 publication, of: Shell International Oil Product
4、s 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 design, construction, operation and maintenan
5、ce 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 recommended standard for good desig
6、n 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 standardization. The information set forth in th
7、ese 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 to allow individual operating co
8、mpanies 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 standards. In particular, for those re
9、quirements 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 detracting from his own responsibility, co
10、nsult 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, SIEP or SIC. Consequently, three
11、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 Service Agreement. 2)Other parties who
12、 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 - work performed on behalf of the s
13、aid 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 any company or person whomsoever a
14、s 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 issue DEPs or require the use of DEP
15、s. 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 exclusively for the purpose for w
16、hich 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 be held in safe custody and SIOP o
17、r 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 Specifications and Draft DEPs for Devel
18、opment (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. Standard Specifications and DDDs wil
19、l gradually be replaced by DEPs. DEP 31.51.10.31-Gen. December 1998 Page 2 TABLE OF CONTENTS 1.INTRODUCTION.5 1.1SCOPE 5 1.2DISTRIBUTION, APPLICABILITY AND REGULATORY CONSIDERATIONS.5 1.3DEFINITIONS 5 1.4CROSS-REFERENCES5 1.5SUMMARY OF MAIN CHANGES6 2.PURPOSE. 7 3.DESIGN AND ENGINEERING8 3.1AREA CLA
20、SSIFICATION8 4.SPECIFICATION FOR SIDE-ENTRY MIXERS9 4.1GENERAL 9 4.2POWER. 10 4.3ELECTRIC DRIVE.11 4.4TRANSMISSION.12 4.5PROPELLERS.14 4.6SHAFT. 15 4.7SHAFT SEALS16 4.8BEARINGS 18 4.9BEARING LUBRICATION.19 4.10OPTIONAL DEVICES20 4.11LIFTING LUGS22 4.12TIE-ROD/PEDESTAL SUPPORT AND BRACKETS23 4.13HIGH
21、 TEMPERATURE SIDE-ENTRY MIXERS24 4.14SHUT-OFF DEVICES25 4.15VIBRATION LEVELS.27 4.16NOISE CONTROL.28 4.17DATA AND INFORMATION TO BE SUBMITTED29 5.INSTALLATION OF SIDE-ENTRY MIXERS.30 5.1TANK AND VESSEL DATA.30 5.2MOUNTING OF SIDE-ENTRY MIXERS.30 5.3LOCATION OF SIDE-ENTRY MIXERS.30 5.4PROPELLER CLEAR
22、ANCE31 5.5ELECTRICITY SUPPLY31 6.ADDITIONAL REQUIREMENTS33 6.1FLANGE FACE SURFACE FINISH.33 6.2NAMEPLATES, RATING PLATES, ASSET NUMBER PLATES.33 6.3SURFACE PROTECTION, PAINTING AND COATING .33 7.INSPECTION AND TESTING.34 7.1GENERAL 34 7.2INSPECTION AND TESTING AT THE MANUFACTURERS WORKS34 7.3SITE TE
23、STS AND COMMISSIONING35 8.REFERENCES37 APPENDICES APPENDIX 1RECOMMENDED MIXER (FIXED-ANGLE) POSITIONS FOR EFFECTIVE BLENDING, HOMOGENEITY AND TEMPERATURE UNIFORMITY.40 APPENDIX 2RECOMMENDED MIXER (SWIVEL-ANGLE) POSITIONS FOR EFFECTIVE B.S. AND W. CONTROL IN CRUDE OIL TANKS 41 APPENDIX 3POSSIBLE LAYO
24、UT OF A HIGH TEMPERATURE GREASE PURGE SYSTEM.42 APPENDIX 4LEAKAGE-CONTROL-SYSTEM43 DEP 31.51.10.31-Gen. December 1998 Page 3 APPENDIX 5EXAMPLE OF AN EMERGENCY COLLAR SEAL.44 APPENDIX 6EXAMPLE OF A REMOTELY ACTUATED EMERGENCY SEAL FOR HIGH TEMPERATURE SIDE-ENTRY MIXERS45 APPENDIX 7STORAGE TANK SIDE-E
25、NTRY INSTALLATION .46 APPENDIX 8MANHOLE MOUNTING NOZZLE FOR FIXED OFFSET ANGLE MIXER 47 DEP 31.51.10.31-Gen. December 1998 Page 4 1.INTRODUCTION 1.1SCOPE This DEP specifies requirements and gives recommendations for the design, fabrication, assembly, testing, inspection and installation of side-entr
26、y mixers for storage tanks and vessels. This DEP shall be used in conjunction with data/requisition sheet DEP 31.51.10.93-Gen. Note:Top-entry mixers should be used for toxic and similar products. This DEP is a revision of the DEP of the same number dated November 1990; a summary of the main changes
27、is given in (1.5). 1.2DISTRIBUTION, APPLICABILITY 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 company, and to Contractors and Manufacturers nominate
28、d 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, chemical plants, gas plants, exploration and production facilities and supply/marketing installations. If national and/or local regulations exist in which some of the re
29、quirements are more stringent than in this manual, 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, economic and legal aspects. In all cases the contractor shall inform the
30、Principal of any deviation from the requirements of this document 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 agreement to follow this document as closely a
31、s 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 of the duties of the Contractor. Th
32、e Manufacturer/Supplier is the party which 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
33、 requirements. The Principal may also include an agent or consultant authorised to act for, and on behalf of, the.Principal. The word shall indicates a requirement. The word should indicates a recommendation. 1.4CROSS-REFERENCES Where cross-references to other parts of this DEP are made, the referen
34、ced section number is shown in brackets. Other documents referenced by this DEP are listed in (8). DEP 31.51.10.31-Gen. December 1998 Page 5 1.5SUMMARY OF MAIN CHANGES This is a revision of the DEP of the same number dated November 1990 (amended by Circular 24/97). This has been mainly an editorial
35、revision, the main technical changes being as follows: Section 3.1Product classifications removed. 4.1.1Entry angle of adaptor now fixed. 4.1.2-Hardness difference specified rather than hardness. -Surface finish less restrictive. 4.2Power requirements less specific. 4.4.4-API reference changed. -AGM
36、A reference updated. 4.4.5AGMA reference removed. 4.6-Critical speed less restrictive. -Surface coating less specific. -Harness difference now specified. 4.7.2Lower pressure limit for single unbalanced mechanical seals. 4.7.2.1API reference changed. 4.9.2Now refers only to DEP 31.29.00.30-Gen. 4.10.
37、1Clarified with respect to static electricity. 4.13.1Definition of “high temperature” changed. 4.14.1End closure less restrictive. 4.14.4Low level trip only required on fixed roof tanks 4.15No allowance for shop conditions. 4.16Now refers only to DEP 31.10.00.31-Gen. 5.4.1Clearances changed. 6.3.1En
38、sis grade updated. 6.3.2Now refers only to DEP 30.48.00.31-Gen. 7.Inspection and test requirements revised. DEP 31.51.10.31-Gen. December 1998 Page 6 2.PURPOSE Side-entry mixers are installed in storage tanks and vessels to fulfil one or more of the following duties: a.BS -the whole tank/vessel cont
39、ents remain pumpable; -the tank/vessel bottom will suffer less from corrosion because the stagnant layer, containing mostly salt water and other corrosive media, is replaced by a less corrosive mixture; -laborious and costly tank/vessel cleaning is required less frequently; -discharging slugs of wat
40、er, with consequent process upsets, will be prevented. For cases b, c and d complete movement throughout the tank/vessel with top to bottom “turnover“ as well as circulation round the tank/vessel will be required to ensure that the total liquid content is uniform to specification. For heat transfer
41、duty the locations of the mixers relative to the heating elements are important to the success of the application. At least one of above described duties shall be filled in on data/requisition sheet DEP 31.51.10.93-Gen by the Principal, including a blending time for case c. DEP 31.51.10.31-Gen. Dece
42、mber 1998 Page 7 3.DESIGN AND ENGINEERING Data/requisition sheet DEP 31.51.10.93-Gen shall be used for the exchange of information between Principal, Contractor and Manufacturer. Where the data/requisition sheet shows alternatives, those items which are not applicable shall be deleted. Design and co
43、nstruction shall be proven in practice, robust and reliable. The Manufacturer shall certify or obtain independent certification that all materials of construction used, meet the requirements specified. The Manufacturer shall obtain for his account all local authority certificates that are.required.
44、3.1AREA CLASSIFICATION Electrical equipment shall be suitable for the hazardous area classification (see IP Model Code Part 15) in which it will be installed and shall have a type of protection in accordance with IEC 60079-14. DEP 31.51.10.31-Gen. December 1998 Page 8 4.SPECIFICATION FOR SIDE-ENTRY
45、MIXERS 4.1GENERAL Side-entry mixers shall be either of the fixed-offset angle type or of the swivel angle type. In both cases, the direction of rotation, as seen from the motor and looking towards the propeller, shall be clockwise and the pumping action shall be away from the tank or vessel shell. T
46、he design shall allow for installation or removal of the mixer assembly (including the propeller) from the tank/vessel simply by bolting or the mounting nozzle cover on which the mixer is assembled. Side-entry mixers shall be supplied assembled, complete with appropriate mountings and ready for inst
47、allation (5.2). 4.1.1Fixed-offset angle type Fixed-offset angle type side-entry mixers shall be used for blending or homogenising purposes. The fixed-offset angle (refer to Appendix 1 and Appendix 8) shall be to the left of the tank radius running through the centre of the mounting flange cover in w
48、hich the mixer is to be installed. A mounting adapter angled at ten degrees shall be used for all tank sizes. 4.1.2Swivel-angle type Swivel-angle type side-entry mixers shall normally be used for BS -Direct single or multi V-belt drives and wedge belt drives; -Spiral bevel gear and hypoid bevel gear
49、 transmission; -Combined helical gear transmission and V-belt drive; -Worm gear transmission. In general a belt drive is preferred because the purchase and maintenance costs of gearbox drives are expected to be higher. V-belts, multi-V-belts and tooth belts shall conform to one of the following specifications: -API 1B; -BS 3790 and BS 4548; -ISO 4184; or -DIN 7753 parts 1 and 2. Belts shall be oil resistant in accordance with BS 903 part A16, as well as fire resistant and anti static “FRAS“ conforming to BS 3790. For general information on electrical resistance of conductive and anti-static