1、BRITISH STANDARD BS EN ISO 4267-2:1996 Incorporating Amendment No. 1 BS7286-2:1990 renumbered Petroleum and liquid petroleum products Calculation of oil quantities Part 2: Dynamic measurements The European Standard EN ISO 4267-2:1995 has the status of a British Standard ICS 75.200BSENISO4267-2:1996
2、This British Standard, having been prepared under thedirectionof the PetroleumStandards Policy Committee, waspublished underthe authorityof the BoardofBSI andcomes into effect on 31 July 1990 BSI 04-2000 The following BSI references relate to the work on this standard: Committee reference PTC/12 Dra
3、ft for comment 86/52063 DC ISBN 0 580 18131 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Petroleum Standards Policy Committee (PTC/-) to Technical Committee PTC/12, upon which the following bodies were represented: Department of Ene
4、rgy (Gas and Oil Measurement Branch) Department of Trade and Industry (National Engineering Laboratory) Department of Transport (Marine Directorate) General Council of British Shipping Institute of Petroleum Royal Institution of Naval Architects Salvage Association The following bodies were also rep
5、resented in the drafting of the standard, through subcommittees and panels: GAMBICA (BEAMA Ltd.) Institute of Measurement and Control United Kingdom Offshore Operators Association Amendments issued since publication Amd. No. Date of issue Comments 8896 March 1996 Indicated by a sideline in the margi
6、nBSENISO4267-2:1996 BSI 04-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 0 Introduction 3 1 Scope and field of application 3 2 References 3 3 Definitions 4 4 Hierarchy of accuracies 5 5 Principal correction factors 5 6 Calculation of prover volume 9 7
7、 Calculation of meter factor 16 8 Calculation of K-factor 24 9 Calculation of measurement tickets 26 Annex A Correction factors for the effect of temperature and pressure on steel 29 Table 1 Hierarchy of accuracies 5 Table 2 Isothermal compressibility factor for water 7 Table 3 Throughput calculatio
8、ns and corresponding meter factor calculations 17 Table 4 Temperature correction factors for steel C tsfor mild steel having a cubical coefficient of expansion of 3.3 10 5 / C 29 Table 5 Temperature correction factors for steel C tsfor stainless steel having a cubical coefficient of expansion of 5.1
9、 10 5 / C 29 Table 6 Correction factors for effect of pressure on a mild steel prover 30 Table 7 Correction factors for effect of pressure on a mild steel prover 31 Publications referred to Inside back coverBSENISO4267-2:1996 ii BSI 04-2000 National foreword This British Standard was prepared by PTI
10、/12 and is the English language version of EN ISO4267-2:1995 Petroleum and liquid petroleum products Calculation of oil quantities Part 2: Dynamic measurement published by theEuropean Committee for Standardization (CEN). It is identical with ISO4267-2:1988 published by the International Organisation
11、 for Standardization (ISO) Additional information. With reference to7.3 and8.3, the employment of digital computers may mean that some users prefer to use all available data without rounding. Agreement may therefore be reached between the parties concerned not to apply the rounding procedure describ
12、ed in7.3 and8.3 and applied throughout the standard. Agreement should then be reached on the number of significant figures to be applied (see also clause0). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their
13、 correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard ISO 91-1:1992 BS 6441:1993 Schedule for petroleum measurement tables BS 6169 Methods for volumetric measurement o
14、f liquid hydrocarbons ISO 2715:1981 Part 2:1984 Turbine meter systems ISO 8222:1987 BS 6922:1988 Specification for temperature corrections for use in the calibration of reference measuring systems for petroleum measurement Summary of pages This document comprises a front cover, an inside front cover
15、, pages i and ii, theEN ISO title page, pages 2 to 32, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPI
16、SCHE NORM EN ISO 4267-2 October 1995 ICS 75.200 Descriptors: Petroleum products, hydrocarbons, liquefied petroleum gases, volume measurement, rules of calculation English version Petroleum and liquid petroleum products Calculation of oil quantities Part 2: Dynamic measurement (ISO 4267-2:1988) Ptrol
17、e et produits ptroliers liquides Calcul des quantits de ptrole Partie 2: Mesurage dynamique (ISO 4267-2:1988) Minerall und flssige Minerallerzeugnisse Berechnung von lmengen Teil2:Dynamische Messung (ISO 4267-2:1988) This European Standard was approved by CEN on1995-09-09. CEN members are bound to c
18、omply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central
19、Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the
20、official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen
21、 de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members Ref. No. EN ISO 4267-2:1995 EENISO4267-2:1995 BSI 04-2000 2 Forewo
22、rd The text of the International Standard from ISO/TC28, Petroleum products and lubricants, of the International Organization for Standardization (ISO) has been taken over as a European Standard by the Technical Committee CEN/TC19, Petroleum products, lubricants and related products. This European S
23、tandard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April1996, and conflicting national standards shall be withdrawn at the latest by April1996. According to CEN/CENELEC Internal Regulations, the following countries
24、 are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.ENISO4267-2:1995 BSI 04-2000 3 0 Introduction Before the compilation of t
25、his publication, words and expressions employed in dynamic measurement calculations were interpreted slightly differently by different people, and there was a lack of coherence in their use. In addition, because data were spread over so many standards, there was difficulty in readily comparing the f
26、iner points of calculations. Rules for rounding, and the choice of how many significant figures entered each calculation, were open to a variety of interpretations. For different operators to obtain identical results from the same data, the rules for sequence, rounding and significant figures have t
27、o be defined. This International Standard aims, among other things, at defining the minimum set of rules required. Nothing in this International Standard precludes the use of more precise determinations of temperature, pressure and density or the use of more significant digits, by mutual agreement a
28、mong the parties involved. This International Standard aims at consolidating and standardizing calculations pertaining to the metering of petroleum liquids, and at clarifying terms and expressions by eliminating local variations of such terms. The purpose of standardizing calculations is to produce
29、the same answer from the same data regardless of the computing system used. Although ISO/TC28 standards use15 C as a standard reference temperature, it is recognized that individual countries may use other reference temperatures, for example20 C,12 C or60 F. This standard sets minimum levels of accu
30、racy for industrial calculations, but, if parties consider agreeing to set tighter requirements, it is important to demonstrate whether such requirements can be met. Future technological progress in meter proving and operation may justify a tighter specification for calculation procedures. 1 Scope a
31、nd field of application This International Standard defines the various terms (be they words or symbols) employed in the calculation of metered petroleum quantities. Where two or more terms are customarily employed in the oil industry for the same quantity, a preferred term is selected. This Interna
32、tional Standard also specifies the equations which allow the values of correction factors to be computed. It also gives rules for the sequence, rounding and significant figures to be employed in a calculation. It provides tables which may be used to look up specific correction factors should it not
33、be desired to calculate them by manual as well as computer methods. The calculation of prover base volumes, meter factors and measurement tickets is also covered. The field of application of this International Standard is the volumetric measurement of liquid hydrocarbons, including liquefied petrole
34、um gases, by meter and prover. It does not include two-phase fluids (though it may be found useful in such situations) except in so far as sediment and water may be mixed in with crude oil. 2 References ISO 91-1, Petroleum measurement tables Part 1: Tables based on reference temperatures of 15 C and
35、60 F. ISO 2715, Liquid hydrocarbons Volumetric measurement by turbine meter systems. ISO 5024, Petroleum liquids and gases Measurement Standard reference conditions. ISO 7278-2, Liquid hydrocarbons Dynamic measurement Proving systems for volumetric meters Part2: Pipe provers 1) . ISO 8222, Petroleum
36、 measurement systems Calibration Temperature corrections for use with volumetric reference measuring systems. ISO 9770, Petroleum products Compressibility factors for hydrocarbons in the range 638 kg/m 3to1074kg/m 3 1) . 1) At the stage of draft.ENISO4267-2:1995 4 BSI 04-2000 3 Definitions For the p
37、urposes of this International Standard, the following definitions apply to the terms used herein: 3.1 base volume the volume of a prover under standard conditions 3.2 indicated volume the change in meter reading that occurs during a transfer through the meter 3.3 K-factor the number of pulses genera
38、ted by a meter for a unit of volume delivered 3.4 measurement ticket a generalized term for the written acknowledgment of the receipt or delivery of a quantity of crude oil or petroleum product, including a record of the measurement data (see clause9). It may be a form to be completed, a data print-
39、out or a data display depending on the degree of automation, remote control, or computerization. Previously described as “run ticket” and “receipt and delivery ticket” 3.5 meter factor the ratio of the actual volume of liquid passed through a meter to the volume indicated by the meter 3.6 net standa
40、rd volume the total standard volume (see3.9) minus the volume of water and sediment transferred through the meter NOTEFor clean, refined products, the total standard volume and net standard volume are usually equal. 3.7 reading; meter reading the instantaneous display of meter volume (see indicated
41、volume) 3.8 standard (reference) conditions for the measurement of petroleum and its products, these are a pressure of 101,325 kPa (1,01325bar) and a temperature15 C, with the exception of liquids having a vapour pressure greater than atmospheric pressure at15 C, in which case the standard pressure
42、is the equilibrium vapour pressure at15 C (seeISO5024) 3.9 total standard volume the total volume at standard temperature, also corrected to standard pressure 3.10 total volume the indicated volume multiplied by the appropriate meter factor for the liquid and flow rate concerned, without correction
43、for temperature and pressure. It includes all water and sediment transferred through the meter K-factor pulses generated by meter volume delivered by meter - = Meter factor volume passed through a meter volume indicated by the meter - =ENISO4267-2:1995 BSI 04-2000 5 4 Hierarchy of accuracies 4.1 Pur
44、pose and implications 4.1.1 There is an inevitable, or natural, hierarchy of accuracies in petroleum measurement. At the top are volume standard measures which are certified by a government agency or laboratory traceable to the appropriate national standard. From this level downwards, any uncertaint
45、y at a higher level must be reflected in all the lower levels as a systematic error. Whether such systematic error will be positive or negative is unknown; either is possible. 4.1.2 To expect equal or less uncertainty at a lower level of the hierarchy than exists in a higher level is unrealistic. Th
46、e only way to decrease the random component of uncertainty in a given measurement system or method is to increase the number of determinations, and calculate the mean value. The number of significant digits in intermediate calculations of a value can be larger in the upper levels of the hierarchy th
47、an in the lower levels. 4.2 Hierarchy 4.2.1 The hierarchy of accuracies in this standard is structured, in general, as shown in Table 1. 4.2.2 This standard gives rules for rounding, truncating and reporting final values for each level of the hierarchy. 5 Principal correction factors 5.1 Purpose and
48、 implications 5.1.1 Designation of correction factors by symbol rather than by words is recommended because, first, it abbreviates their expression; second, it allows algebraic manipulations; third, it indicates their similarity subject only to the particular liquid or metal involved; and fourth, it
49、 can more readily eliminate confusion, as for example the difference between the compressibility factor F of a liquid and the correction factor C pl , which is a function of F. There are six principal correction factors employed in calculations of liquid quantities. 5.1.2 The first of these six correction factors is the meter factor M
