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1、BRITISH STANDARD BS 6169-1: 1981 ISO 2714:1980 Methods for Volumetric measurement of liquid hydrocarbons Part 1: Displacement meter systems (other than dispensing pumps) ISO title: Liquid hydrocarbons Volumetric measurement by displacement meter systems other than dispensing pumps UDC 665.738:681.12
2、1:531.732 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6169-1:1981 This British Standard, having been prepared under the direction of the Petroleum Standards Committee, was published under the authority of the Board of BSI and comes in
3、to effect on 30 November 1981 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference PTC/12 Draft for comment 77/50141 DC ISBN 0 580 12437 1 Cooperating organizations The Petroleum Standards Committee, under whose direction this British Standard was prepare
4、d, consists of representatives from the following: Chemical Industries Association British Lubricants Federation Limited British National Oil Corporation Department of Industry (National Engineering Laboratory)* Hydrocarbon Solvents Association Institute of Petroleum* London Transport Executive Mini
5、stry of Defence Society of Motor Manufacturers and Traders Limited The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Association of Commodity Cargo Su
6、perintendents and Surveyors British Gas Corporation Department of Energy (Gas Standards) Department of Trade Department of Trade (Marine Division) General Council of British Shipping Institution of Gas Engineers The Salvage Association UK Offshore Operators Association Ltd. United Kingdom Petroleum
7、Industry Advisory Committee Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6169-1:1981 BSI 10-1999i Contents Page Cooperating organizationsInside front cover National fore
8、wordii 0Introduction1 1Scope and field of application1 2References1 3System design and selection of meters and ancillary equipment1 4Installation in metering systems2 5Meter performance4 6Operation and maintenance of metering systems6 Annex Typical arrangement of meter station with three displacemen
9、t meters8 National appendix A Clarification of ISO text9 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6169-1:1981 ii BSI 10-1999 National foreword This Part of this British Standard has been pr
10、epared under the direction of the Petroleum Standards Committee. It is identical with ISO 2714 “Liquid hydrocarbons Volumetric measurement by displacement meter systems other than dispensing pumps” published in 1980 by the International Organization for Standardization (ISO). Part 21) of this Britis
11、h Standard, “Turbine meter systems”, is expected to be identical with ISO 2715 “Liquid hydrocarbons Volumetric measurement by turbine meter systems”. Both of these ISO standards have been prepared by Sub-committee 2, Dynamic Petroleum Measurement, of ISO Technical Committee ISO/TC 28, Petroleum prod
12、ucts and lubricants, in which the UK is an active participant. Attention is drawn to National appendix A which details items which the BSI Technical Committee consider to require clarification. Terminology and conventions. The text of the International Standard has been approved as suitable for publ
13、ication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full poi
14、nt on the baseline as the decimal marker. Wherever the words “International Standard” appear, relating to this publication, they should be read as “British Standard”. Cross-references. ISO 91, which is referred to in clause 2, 5.3.3.1 and 5.3.4.3, is in course of preparation and will be published in
15、 two Parts: ISO 91-1, relating to measurement at 15 C and 60 F, and ISO 91-2, relating to measurement at 20 C. The BSI Technical Committee responsible has approved the draft of ISO 91 for eventual adoption as a British Standard. ISO 91 will supersede ISO/R 91:1970, which requires reference to BSI Ha
16、ndbooks 15 and 16. These will be withdrawn upon adoption of the revised ISO 91 as a British Standard. ISO 4124, which is at present at draft stage, is referred to in clause 2, 5.2.6, 6.2.5, 6.3 and 6.4.1 for information only. The validity of the standard is therefore not affected. Additional informa
17、tion. The attention of users of this British Standard is drawn to the following publications, which may contain additional information of assistance to them in connection with the use of displacement meter systems. a) H.M. Customs and Excise Notice No. 179M (October 1975) “Hydrocarbon Oils Flow Mete
18、rs at Bonded Oil Installations”. b) ISO/DIS 6551 “Petroleum liquids and gases Fidelity and security of dynamic measurement Electric and/or electronic pulsed data cabled transmission”, which is at present in course of preparation and is expected to be published as a British Standard. The Draft Standa
19、rd has been based on Part XIII of the IP Petroleum Measurement Manual “Fidelity and Security of Measurement Data Transmission Systems” Section 1-252/76, Institute of Petroleum, London 1976. NOTETextual error. In the last line of 5.3.4.3, the footnote reference “2)” should read “1)”. 1) In course of
20、preparation. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6169-1:1981 BSI 10-1999iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correc
21、t application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 10, an inside back cover and a back cover. This standard has been updated (see copyrig
22、ht date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47
23、:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6169-1:1981 BSI 10-19991 0 Introduction Displacement meters measure by separating a liquid into discrete volumes and counting the separated volumes. Such meters carry through their measuring elements a theoretical swept volume of liquid plus the slip
24、page for each stroke, revolution or cycle of the moving parts. The volume registered must be compared with a known volume by proving. This International Standard has been prepared as a guide for those concerned with the design, installation, operation and maintenance of metering systems having one o
25、r more displacement meters. Its content is common to all displacement meters. A typical arrangement of a meter station with three displacement meters is shown in the Annex. Information on turbine meters appears in ISO 2715, Liquid hydrocarbons Volumetric measurement by turbine meter systems.2) Futur
26、e International Standards will deal with other types of meters, accessory equipment, provers and proving, the calculation of petroleum quantities, and specialized applications of metering assemblies containing displacement meters. 1 Scope and field of application 1.1 Scope This International Standar
27、d specifies the characteristics of displacement meters and gives rules for systematically applying appropriate consideration to the nature of the liquids to be measured, to the installation of a metering system, and to the selection, performance, operation and maintenance of the same. 1.2 Field of a
28、pplication The field of application is any division of the petroleum industry in which measurement is required, but it does not necessarily apply to two-phase liquids. Measurement tolerance or limits of error are usually set by regulation or, in certain countries, by a mutual accord between parties.
29、 It is not the purpose of this International Standard to set tolerances or accuracy limits. However, these provisions should be adequate to achieve a degree of measurement accuracy acceptable for any metering requirement. The content of the International Standard is general and is intended as a guid
30、e. It can be applied to the metering of different hydrocarbon liquids, to the use of meters from any manufacturer and to the various applications encountered. 2 References ISO 91, Petroleum measurement tables3). ISO 4124, Petroleum metering systems Measurement control charts and statistical methods2
31、). 3 System design and selection of meters and ancillary equipment 3.1 Design considerations All types of metering installations shall meet the following requirements: a) They shall be suitable for the maximum and minimum flow rates, the maximum permissible operating pressure, the temperature range
32、and the type of liquid to be measured. If necessary, protective devices shall be included to limit or control the operation within the design conditions of the metering installation. b) National, state or municipal regulations for electrical equipment in hazardous areas shall be complied with if the
33、re is a possibility of a hazardous atmosphere being present at the installation site. c) All materials of construction in contact with the hydrocarbon liquid shall neither affect nor be affected by the liquid. d) They shall be designed in a manner which will result in the maximum dependable operatin
34、g life. This may require that strainers, filters or other protective devices be installed to remove abrasive or other entrained particles from the liquid which could stop or cause premature wear of the metering mechanism. A differential pressure gauge may be used to determine when the filter or stra
35、iner should be cleaned. In other services where the liquid is clean or where the type of meter installed does not require or warrant protection, the omission of the filter or strainer can be considered. e) Where applicable, connections for proving facilities shall be provided and the installation fo
36、r proving the meter shall comply with the national verification regulations. 3.2 Selection of displacement meter and ancillary equipment 3.2.1 Consideration shall be given to, and the manufacturer consulted, regarding the following when selecting a meter and its ancillary equipment (see Annex, figur
37、e): a) space for the meter installation and where applicable the proving facility; 2) At present at the stage of draft. 3) At present at the stage of draft. (Revision of ISO/R 91). Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6169-1:19
38、81 2 BSI 10-1999 b) class and type of connections required, and dimensions of the equipment to be used; c) the properties of liquids that the meter will be required to measure, including viscosity, density ranges, vapour pressure, corrosiveness and lubricating properties. These properties may influe
39、nce meter characteristics and choice of materials of construction. An increase in viscosity will generally increase pressure drop and bearing load. A change in viscosity may shift and change the shape of the calibration curve. Meter wear will be increased when non-lubricating liquids are being measu
40、red; d) the quantity, size, particle distribution and type of foreign matter, and the quantity of water or vapour which may be carried in the stream. These may influence the size of straining, filtering and vapour or water separation equipment from the standpoints of flow rate4) capacity and pressur
41、e drop; e) the maximum and minimum rates of flow and whether the flow is continuous or intermittent; f) range of operating pressures and pressure losses across the meter when run at the maximum expected flow rate; g) temperature range within which the meter will operate; whether volume correction to
42、 a reference or base temperature will be required; and whether or not heat tracing is used; h) maintenance methods and cost; spare parts required; j) type, method and frequency of proving; k) the meters rangeability and the degree of precision required; m) a means whereby a meter read-out may be adj
43、usted so that correction for meter factor is not necessary, and the ease or reliability of the adjustment and its suitability for sealing; n) type of indicating or recording, or indicating and recording devices required and the standard units of volume in which read-out is required or, in the case o
44、f meters fitted with integrating counters giving read-out in mass, the unit of mass required; p) suitability for use with remote registering equipment; q) need for any other ancillary equipment such as quantity predetermining devices, pulsers, additive injection equipment, automatic temperature comp
45、ensators, combinators, etc. When using mechanical ancillary devices driven by the meter, caution should be observed to limit the total torque applied to the meter element. Consideration should also be given to using an electrical device (transmitter) on the meter, and to having various functions ope
46、rated electrically therefrom. 3.2.2 Automatic temperature compensators, if installed, shall be chosen to respond to the temperature range of the measured liquid within the required measurement tolerances under all ambient conditions. 3.2.3 Meter capacity shall be based on flow rate range required an
47、d allowable pressure drop requirements. Size of inlet/outlet connections do not necessarily indicate flow capacity. 4 Installation in metering systems This clause includes details for the installation of displacement meters in metering systems. 4.1 Each meter shall be installed in such a manner as t
48、o prevent passage of air or vapour through it. If necessary, a degassing device shall be installed upstream of, and as close to, the meter as possible and the air release vents shall be piped to an appropriate and safe location or vessel. Vent piping shall meet safety and regulatory requirements. 4.
49、2 The entire installation shall be designed to minimize the entry of air or vapour into the system, e.g. a pressure relief valve placed downstream of a meter shall not be linked to one upstream of the meter. 4.3 For meters designed for flow in one direction only, provision shall be made to prevent flow in the reverse direction. 4.4 Generally all valves, and especially spring-loaded or self-closing valves, shall be of such design that they will not open to admit air. 4.5 Any condition which may cause the release of vapour from the liquid shall be avoided b