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1、2714-80 4851903 0033738 4 r INTERNATIONAL STANDARD IS0 2714-1980 (E)/ERRATUM F a 56-69 Published 1982-07-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MEXAYHAPOAHAR OPrAHH3AUHR no CTAHAAPTM3AUMM - ORGANISATION INTERNATIONALE DE NORMALISATION Liquid hydrocarbons - Volumetric measurement by displ
2、acement meter systems other than dispensing pumps ERRATUM Page 2 Sub-clause 3.2.1 e), amend to read : “. . . whether the flow is continuous, intermittent or fluctuating;“. Sub-clause 3.2.1 g), amend final phrase to read : “. . .; and whether or not heat tracing and/or insulation is required.“ Page 4
3、 Sub-clause 5.2.4, line 2 : delete the words “at retail dispensing pumps,“ and insert the word “on“ in their place. Page 5 Sub-clause 5.3.2 Line 2, replace “as a result of“ by “resulting in“ Line 5 to 11, replace with the following : “It is-therefore important to take into account the parameters tha
4、t have changed before selecting a meter factor for application to a bill of lading, from a plot of meter factor versus viscosity. It is preferable to re-prove the meter either if the liquid changes or if a significant change in temperature occurs without a change of liquid.“ Sub-clause 5.3.4.3, foot
5、note reference should be 1, not 2. Page 6 Sub-clause 6.4.2, line 6, amend to read : “. . . and 2 is the mean of all these values.“ Sub-clause 6.4.3 a), replace “prover tank“ by “prover“. Page 7 Sub-clause 6.4.3 d), replace “prover tank“ by “prover“. Page 8 Annex, add the following below the figure :
6、 “NOTE - All sections of line which may be blocked between valves shall have provisions for pressure relief.“ Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 23:14:27 MDTNo repro
7、duction or networking permitted without license from IHS -,-,- Liquid hydrocarbons - Volumetric measurement by displacement meter systems other than dispensing pumps Hydrocarbures liquides - Mesurage volumtrique au moyen de compteurs chambre mesureuse autres que ceux des ensembles de mesurage routie
8、rs First edition - 1980-10-15 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 23:14:27 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword IS0 (the
9、 International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 member bodied. The work of developing Inter- national Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee
10、has been set up has the right to be represented on that committee. international organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval befor
11、e their acceptance as International Standards by the IS0 Council. International Standard IS0 2714 was developed by Technical Committee ISO/TC 28, Petroleum products and lubricants, and was circulated to the member bodies in December 1976. It has been approved by the member bodies of the following co
12、untries : Australia Austria Belgium Brazil Bulgaria Canada Chile Czechoslovakia Egypt, Arab Rep. France Hungary India Iran Israel Japan Korea, Rep. of Mexico of Philippines Poland Romania Spain Sweden Turkey United Kingdom USA USSR The member body of the following country expressed disapproval of th
13、e document on technical grounds : Germany, F. R. E International Organization for Standardization, 1980 * Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 2
14、3:14:27 MDTNo reproduction or networking permitted without license from IHS -,-,- Contents Page O Introduction . 1 1 Scope and field of application 1 2 References 1 3 System design and selection of meters and ancillary equipment . 1 3.1 Design considerations 1 3.2 Selection of displacement meter and
15、 ancillary equipment 2 4 Installation in metering systems 2 5 Meterperformance . 3 5.1 General 3 5.2 Meterfactor 4 5.3 Causes of variation in meter factor value and their impact on calculation of petroleum volumes 4 6 Operation and maintenance of metering systems 5 6.1 General 5 6.2 Conditions affec
16、ting operation . 5 6.3 Meter maintenance 6 6.4 Meter factor control charts 6 Typical arrangement of meter station with three displacement meters . 8 Annex Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 No
17、t for Resale, 04/23/2007 23:14:27 MDTNo reproduction or networking permitted without license from IHS -,-,- 2734-80 m 4853903 0033722 bl INTERNATIONAL STANDARD IS0 2714-1980 (E) Liquid hydrocarbons - Volumetric measurement by displacement meter systems other than dispensing pumps O Introduction Disp
18、lacement 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 slippage for each stroke, revolution or cycle of the moving parts. The volume registered must be c
19、ompared 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 or more displace- ment meters. Its content is common to all displacement meters. A typical arra
20、ngement of a meter station with three displace- ment meters is shown in the annex. Information on turbine meters appears in IS0 2715, Liquid hydrocarbons - Volumetric measurement by turbine meter systems. 1) Future International Standards will deal with other types of meters, accessory equipment, pr
21、overs and proving, the calculation of petroleum quantities, and specialized applica- tions of metering assemblies containing displacement meters. 1 Scope and field of application 1.1 Scope This International Standard specifies the characteristics of displacement meters and gives rules for systematic
22、ally 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 application The field of application is any division of the petroleum industry in whic
23、h 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. It is not the purpose of this International Standard to set tolerances or accuracy l
24、imits. However, these provisions should be adequate to achieve a degree of measurement ac- curacy acceptable for any metering requirement. The content of the International Standard is general and is intended as a guide. It can be applied to the metering of different hydrocar- bon liquids, to the use
25、 of meters from any manufacturer and to the various applications encountered. 2 References IS0 91, Petroleum measurement tables.2) IS0 4124, Petroleum metering systems - Measurement con- trol charts and statistical methods. 1) 3 System design and selection of meters and ancillary equipment 3.1 Desig
26、n considerations All types of metering installations shall meet the following re- quirements : a) They shall be suitable for the maximum and minimum flow rates, the maximum permissible operating pressure, the temperature range and the type of liquid to be measured. If necessary, protective devices s
27、hall 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 there is a possibility of a hazardous atmosphere being present at the instal
28、lation site. 1) At present at the stage of draft. 2) At present at the stage of draft. (Revision of ISO/R 91). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 23:14:27 MDTNo repr
29、oduction or networking permitted without license from IHS -,-,- - ISQ 2714-1980 (E) 2734-80-1 4853903 0033723 8 1 c) All materials of construction in contact with the hydrocarbon liquid shall neither affect nor be affected by the liquid. di They shall be designed in a manner which will result in the
30、 maximum dependable operating 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 deter
31、mine when the filter or strainer should be cleaned. In other services where the liquid is clean or where the type of meter installed does not require or warrant pro- tection, the omission of the filter or strainer can be con- sidered. e) Where applicable, connections for proving facilities shall be
32、provided and the installation for 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 ancil
33、lary equipment (see annex, figure) : a) space for the meter installation and where applicable the proving facility; b) of the equipment to be used; class and type of connections required, and dimensions c) the properties of liquids that the meter will be required to measure, including viscosity, den
34、sity ranges, vapour pressure, corrosiveness and lubricating properties. These properties may influence 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
35、of the calibra- tion curve. Meter wear will be increased when non- lubricating liquids are being measured; 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, filte
36、ring and vapour or water separation equip- ment from the standpoints of flow rate capacity and pressure drop; e) the maximum and minimum rates of flow and whether the flow is continuous or intermittent; f) the meter when run at the maximum expected flow rate; range of operating pressures and pressur
37、e losses across g) temperature range within which the meter will operate; whether volume correction to a reference or base tem- perature 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) quir
38、ed; the meters rangeability and the degree of precision re- m) a means whereby a meter read-out may be adjusted 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 r
39、ecording devices required and the standard units of volume in which read-out is required or, in the case of 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
40、such as quantity predetermining devices, pulsers, additive injection equip- ment, automatic temperature compensators, 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
41、 also be given to using an electrical device (transmitter) on the meter, and to having various functions operated 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
42、 tolerances under all ambient conditions. 3.2.3 Meter capacity shall be based on flow rate range required and 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 inst
43、allation of displacement meters in metering systems. 4.1 Each meter shall be installed in such a manner as to pre- vent passage of air or vapour through it. If necessary, a degass- ing device shall be installed upstream of, and as close to, the meter as possible and the air release vents shall be pi
44、ped to an appropriate and safe location or vessel. Vent piping shall meet safety and regulatory requirements. 4.2 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 ups
45、tream of the meter. 4.3 sion shall be made to prevent flow in the reverse direction. For meters designed for flow in one direction only, provi- 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. 2 Copyright In
46、ternational Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 23:14:27 MDTNo reproduction or networking permitted without license from IHS -,-,- 4.5 from the liquid shall be avoided by proper design. Any
47、condition which may cause the release of vapour 4.6 accidental drainage or vaporization of liquid is avoided. Meters and piping shall be installed in such a manner that 4.7 Any connections for proving shall be installed so that the trapping of air or vapour in the piping between the metering system
48、and the prover is avoided, or that adequate bleed-off connections are provided. 4.8 Meters shall be installed in the attitude suggested by the manufacturer and shall not be subjected to undue strain and vibration. 4.9 The installation of a bank of meters connected in parallel is recommended, especia
49、lly where they are required in con- tinuous service, or where the flow rate is too great for any one meter. Each meter in a bank should be protected against an ex- cessive flow rate, and means should be provided for balancing the flow between individual meters. 4.10 Means shall be provided for relieving excessive pressures on the meter piping likely to be caused by th