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1、TECHNICAL SPECIFICATION LIQUID RING VACUUM PUMPS AND COMPRESSORS (AMENDMENTS/SUPPLEMENTS TO API STD 681) DEP 31.29.42.30-Gen. July 1997 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
2、be disclosed to any third party 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
3、part of this document may be reproduced, 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 refl
4、ect the views, at the time of publication, 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 d
5、uring their involvement with the 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 code
6、s of practice. The objective is 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 techni
7、cal and economic benefit from standardization. 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
8、 DEPs is expected to be sufficiently 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
9、 of the required design and engineering 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 M
10、anufacturer/Supplier shall, without 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 receiv
11、ing technical advice and services 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 t
12、he terms and conditions of the relevant 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 p
13、rojects, materials supplied or - 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 dam
14、age (including injury or death) 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 compa
15、ny affiliated to these companies 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
16、person whomsoever and the DEPs shall 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 SIO
17、P and SIEP. Users shall arrange 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
18、to DEP publications there are Standard 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 applic
19、able to Standard Specifications and DDDs. Standard Specifications and DDDs will gradually be replaced by DEPs. DEP 31.29.42.30-Gen. July 1997 Page 2 TABLE OF CONTENTS PART IINTRODUCTION.4 1.1SCOPE 4 1.2DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS4 1.3DEFINITIONS 4 1.4CROSS-REFERENCES4 1.
20、5GUIDANCE FOR USE.5 PART IIAMENDMENTS/SUPPLEMENTS TO API STD 6816 SECTION 1 GENERAL 6 1.3CONFLICTING REQUIREMENTS6 1.4DEFINITION OF TERMS.6 1.5REFERENCED PUBLICATIONS6 SECTION 2 BASIC DESIGN. 6 2.1GENERAL 6 2.3CASING CONNECTIONS.7 2.4EXTERNAL FORCES AND MOMENTS7 2.5ROTATING ELEMENTS7 2.6MECHANICAL S
21、HAFT SEALS7 2.7DYNAMICS 8 2.8BEARINGS, BEARING HOUSINGS AND LUBRICATION8 2.9MATERIALS 8 SECTION 3 ACCESSORIES. 8 3.1RING LIQUID SYSTEM.8 3.2CONTROLS AND INSTRUMENTATION9 3.3DRIVERS AND TRANSMISSIONS.9 3.4COUPLINGS AND GUARDS10 3.7PIPING. 10 SECTION 4 INSPECTION, TESTING, AND PREPARATION FOR SHIPMENT
22、10 4.1GENERAL 10 4.2INSPECTION.11 4.3TESTING. 12 PART IIIREFERENCES13 DEP 31.29.42.30-Gen. July 1997 Page 3 PART IINTRODUCTION 1.1SCOPE This new DEP specifies requirements and gives recommendations for liquid ring vacuum pumps and compressors. Part II of this DEP gives amendments and supplements to
23、API Std 681, on which this DEP is based. 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 Company, and to Contractors and M
24、anufacturers/Suppliers nominated by them (i.e. the distribution code is “F” as described in DEP 00.00.05.05-Gen.). This DEP is intended for use in oil refineries, gas handling installations, chemical plants, oil and gas production facilities, and supply/marketing installations. If national and/or lo
25、cal 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 combination of requirements will be acceptable as regards safety, environmental, economic and
26、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 regulations. The Principal may then negotiate with the Authorities concerned with the object of o
27、btaining 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, construction, commissioning or management of a project, or operation or maintenance of a facility.
28、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 Principal is the party which initiates the project and ultimately pays for its
29、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 indicates a requirement. The word should indicates a recommendation. 1.3.2Specific defi
30、nitions The Purchaser is the party which buys the liquid ring compressor or pump for its own use or as an agent for the owner. The Purchaser may be either the Principal or the Contractor. The term Vendor used in API Std 681 is synonymous with the term Manufacturer/Supplier as defined above. 1.4CROSS
31、-REFERENCES Where cross-references to other parts of this DEP are made, the referenced section number is shown in brackets. Referenced section numbers in the API document are not shown in brackets. Other documents referenced in this DEP are listed in (Part III). 1.5GUIDANCE FOR USE The amendments an
32、d supplements given in Part II refer directly to specific sections in API DEP 31.29.42.30-Gen. July 1997 Page 4 Std 681. Where clauses in API Std 681 are referenced within this DEP, those clauses as amended by this DEP shall be meant. Clauses in API Std 681 that are not amended by this DEP shall rem
33、ain valid as written. A bullet () in the margin against certain clauses in API Std 681 indicates that a decision by the Principal is required. These decisions shall be indicated directly on the requisition sheet where provided for; otherwise they shall be indicated on the requisition sheet under the
34、 heading Additional Requirements or stated in the purchase order. DEP 31.29.42.30-Gen. July 1997 Page 5 PART II AMENDMENTS/SUPPLEMENTS TO API STD 681 SECTION 1 GENERAL 1.3CONFLICTING REQUIREMENTS Replace this clause by: In the case of conflict between documents relating to the inquiry or purchase or
35、der, the following hierarchy of documents shall apply: -upper level:purchase order and variations thereto; -second level:requisition; -third level:this DEP. 1.4DEFINITION OF TERMS Add new clause: 1.4.27“Hazardous service“ is defined as a service in which the process stream contains: -hydrogen sulphi
36、de above 600 mg/kg; -hydrogen plus hydrocarbons when the partial pressure of hydrogen exceeds 0.7 MPa (7 bar abs); -hydrocarbons at an operating temperature above the auto-ignition temperature; -toxic substances (as indicated on the data/requisition sheet); -hydrocarbon services butane and lighter;
37、-hydrocarbon services with a seal chamber vapour pressure greater than 0.5 MPa (5 bar abs). 1.5REFERENCED PUBLICATIONS Add to this clause: Standards referenced by this DEP are listed in (Part III). DEP 31.29.42.30-Gen. July 1997 Page 6 SECTION 2 BASIC DESIGN 2.1GENERAL 2.1.1Add to this clause: The e
38、quipment shall not exceed the limits of the Vendors design and shall be within the Vendors actual experience. Equipment shall have proven reliability. 2.1.3Add to this clause: Data/requisition sheets for Rotary Type Compressors and Fans (ref. DEP 31.29.42.93- Gen.) may be used. The Purchaser shall s
39、pecify the equipments normal operating duty and any alternative duties on the data sheets. DEP 31.29.42.30-Gen. July 1997 Page 7 2.1.4Replace this clause by: Noise Control: The Contractor shall comply with DEP 31.10.00.31-Gen. and thereby communicate to the Vendor the specified equipment noise limit
40、ations by using data sheet DEP 31.10.00.94- Gen., which forms part of the requisition. The Vendor is responsible for assuring that these equipment noise limitations have been specified. The Vendor shall submit guaranteed sound power levels and sound pressure levels of the equipment, together with an
41、y other relevant information requested in the data sheet, DEP 31.10.00.94-Gen. The Vendor shall indicate which special measures, if any, are proposed in order to meet the specified levels. 2.1.8Replace this clause by: All electrical components and installations shall be suitable for the area classif
42、ication, gas grouping and temperature classes specified by the Principal on the data/requisition sheet. 2.1.14Replace the first sentence of this clause by: All equipment shall be additionally suitable for running on air during testing and commissioning. 2.3CASING CONNECTIONS 2.3.3Delete the words “o
43、r threaded and seal welded“ from the first sentence. 2.3.4Replace this clause by: Threaded connections shall not be used for equipment in hazardous service. Where threaded joints are supplied they shall not be seal welded. 2.3.6Add to this clause: NOTE:The excluded opening sizes may be accepted if t
44、he cost impact of changing the Vendors standard design exceeds the cost of non-standard piping design. 2.3.8.5Add new clause: In hazardous service applications or when specified the gasket contact surface finish shall be in accordance with API Std 610 clause 2.3.2.6. 2.4EXTERNAL FORCES AND MOMENTS A
45、dd to this clause: Alternativelythe nozzle loadings outlined in API Std 610 should be used. 2.5ROTATING ELEMENTS 2.5.3Add to the end of the second sentence: . and with the approval of the Principal. NOTE:Filling the void with metal may lead to unacceptable vibration levels. Consideration shall be gi
46、ven to the method of venting, particularly in hazardous service. 2.6MECHANICAL SHAFT SEALS 2.6.6Add to this clause: NOTE:Mechanical seals shall normally have silicon carbide face material and carbon seat material unless incompatible with the seal liquid. DEP 31.29.42.30-Gen. July 1997 Page 8 2.6.9Ad
47、d to this clause: Alternatively, the mechanical seal piping may be in accordance with the appropriate plan shown in API Std 682. 2.7DYNAMICS 2.7.2.3Replace this clause by: If specified, the level quoted in 2.7.2.2 shall be demonstrated for all operating conditions specified in the data sheets. 2.8BE
48、ARINGS, BEARING HOUSINGS AND LUBRICATION 2.8.1.1Add to this clause: Cages of antifriction bearings shall be metal. 2.8.2.3Replace the word “toxic“ with “hazardous“. 2.8.2.6Add to this clause: For small units, it may not be practical for the location of the vibration transducer to be in accordance wi
49、th API Std 670. In such cases the location of the transducer shall be in accordance with the Vendors standard. 2.9MATERIALS 2.9.1.9Replace this clause by: All materials for components exposed to hydrogen sulphide in concentrations exceeding the limits prescribed by NACE MR0175 shall conform to the requirements of NACE MR0175. All external bolting on the casing and seal glands shall also conform to the above requirements even where NACE MR0175 restricts the requirement to enclosed bolting. The Purchaser shall specify on the data sheets the level of hydrogen sulphide in the process g