1、DEUTSCHE NORM December 1996 Calculation of oil quantities for petroleum and liquid petroleum products Dynamic measurement (IS0 4267-2 : 1988) Enalish version of DIN EN IS0 4267-2 DIN EN IS0 4267-2 This standard incorporates the English version of Is0 4267-2 ICs 75.200 Descriptors: Calculation, oil q
2、uantity, petroleum products, measurement. Minerall und flssige Minerallerzeugnisse - Berechnung von lmengen - Teil 2: Dynamische Messung (IS0 4267-2 : 1988) European Standard EN IS0 4267-2: 1995 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard
3、has been published in accordance with a decision taken by CENTTC 19 to adopt, without alteration, International Standard IS0 4267-2 as a European Standard. The responsible German body involved in its preparation was the Normenausschu Materialprfung (Materials Testing Standards Committee). DIN IS0 91
4、 -1 and DIN EN IS0 8222 are the standards corresponding to International Standards IS0 91 -1 and IS0 8822, respectively, referred to in clause 2 of the EN. Standard referred to (and not included in References) DIN EN IS0 8222 Calibration of petroleum measurement systems - Temperature corrections for
5、 use with volumetric reference meas- uring systems (IS0 8222 : 1987) EN comprises 27 pages No part of this standard may be reproduced without the prior permission of Ref. No. DIN EN /SO 4267-2: 1996-12 DIN Deutsches Institut fr Normung e.!., Berlin. Eeuth Verlag GmbH, Berlin, has the exclusive right
6、 of sale for German Standards (DIN-Normen). Price group 14 Sales No. 11 14 06.97 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 4267-2 October 1995 ICs 75.200 Descriptors: Calculation, oil quantity, petroleum products, measurement. English version Petroleum and liquid petroleum products Ca
7、lculation of oil quantities Part 2: Dynamic measurement (IS0 4267-2: 1988) Ptrole et produits ptroliers liquides - Minerall und flssige Minerallerzeug- Calcul des quantits de ptrole - Partie 2: nisse - Berechnung von lmengen -Teil 2: Mesurage dynamique (IS0 4267-2: 1988) Dynamische Messung (IS0 4267
8、-2 1988) This European Standard was approved by CEN on 1995-09-09 and is identical to the IS0 Standard as referred to. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without a
9、ny alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made b
10、y translation under the responsibility of a GEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Lu
11、xembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1995. GEN - All rights of exploitation in a
12、ny form and by any means reserved worldwide for CEN national members. Ref. No. EN IS0 4267-2: 1995 E Page 2 EN IS0 4267-2 : 1995 Foreword International Standard IS0 4267-2 : 1988 which was prepared by ISO/TC 28 Petroleum products and lubricants of the International Organization for Standardization,
13、has been adopted by Technical Committee CENTTC 19 Petroleum products, lubricants and related products as a European Standard. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, and conflicting national standards with
14、drawn, by April 1996 at the latest. In accordance with the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, S
15、weden, Switzerland, and the United Kingdom. Petroleum and liquid petroleum products - Calculation of oil quantities - Dynamic measurement, Endorsement notice The text of the International Standard IS0 4267-2: 1988 was approved by CEN as a European Standard without any modifi- cation. Contents O Intr
16、oduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Scope and field of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 References . 3 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Hiera
17、rchy of accuracies . . . . . . . . 4.1 Purpose and implications . . . 4.2 Hierarchy . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Principal correction factors . . . . 5.1 Purpose and implications . . I I , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、. . . . . 5.2 C, II . ., . . 5.3 cp. . . . . . . . . . . 5.4 cpi . 5.5 C,I 6 Calculation of prover volume 6.1 6.2 Volume standard measures 6.3 Rule for rounding - Provers . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 Temperature and pressure . . . , . . . . . . .
19、6.5 Calculation of basevolumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6 Corrections applied to measured-volume water draw method . . . . . . . . . . . 6.7 Example of calculation - Calibration of pipe prover by water draw method using field standards . . . .
20、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.8 Example of calculation - Calibration of tank prover by water draw Purpose and implications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4 4 4 5 5 5 5 5 5 6 7 7 8 8
21、 8 8 8 9 9 9 9 method using field standards . , , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Page 3 EN IS0 4267-2: 1995 6.9 Example of calculation . Calibration of pipe prover by master meter method . 12 7 Calculation of meter factor 14 7.1 Purpose and implications 14
22、 7.2 Temperature and pressure . 16 7.3 Rule for rounding - Meter factors 16 7.4 Calculation of standard meter factor for a displacement meter. using a prover tank . 16 7.5 Calculation of standard meter factor for a turbine meter. using a pipe prover . 17 7.6 Calculation of meter factor at standard c
23、onditions for a displacement meter. using a master meter 20 8 Calculation of K-factor 22 8.1 Purpose and implications 22 8.2 Temperature and pressure . 22 8.3 Rule for rounding - K.factors 22 8.4 Calculation of K-factor for a turbine meter. using a pipe prover 22 9 Calculation of measurement tickets
24、 . 23 9.1 Purpose and implications 23 9.2 Rule for rounding - Measurement tickets 23 9.3 Correction factors and accuracy 23 Annex A Correction factors for the effect of temperature and pressure on steel . . 25 Page 4 EN IS0 4267-2 : 1995 O Introduction Before the compilation of this publication, wor
25、ds and expres- sions employed in dynamic measurement calculations were in- terpreted 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 finer points of c
26、alculations. Rules for rounding, and the choice of how many significant figures entered each calculation, were open to a variety of inter- pretations. For different operators to obtain identical results from the same data, the rules for sequence, rounding and significant figures have to be defined.
27、This International Stan- dard 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 among the par
28、ties involved. This International Standard aims at consolidating and standar- dizing calculations pertaining to the metering of petroleum li- quids, and at clarifying terms and expressions by eliminating local variations of such terms. The purpose of standardizing calculations is to produce the same
29、 answer from the same data regardless of the computing system used. Although ISO/TC 28 standards use 15 OC as a standard reference temperature, it is recognized that individual countries may use other reference temperatures, for example 20 OC, 12 OC or 60 OF. This standard sets minimum levels of acc
30、uracy for industrial calculations, but, if parties consider agreeing to set tighter re- quirements, it is important to demonstrate whether such re- quirements can be met. Future technological progress in meter proving and operation may justify a tighter specification for calculation procedures. 1 Th
31、is International Standard defines the various terms (be they words or symbols) employed in the calculation of metered Scope and field of application petroleum quantities. Where two or more terms are customarily employed in the oil industry for the same quantity, a preferred term is selected. This In
32、ternational 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
33、 not be desired to calculate them by manual as well as computer methods. The calculation of prover base volumes, meter fac- tors and measurement tickets is also covered. The field of application of this International Standard is the volumetric measurement of liquid hydrocarbons, including li- quefie
34、d petroleum gases, by meter and prover. lt does not in- clude 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 IS0 91-1, Petroleum measurement tables - Part 1: Tables based on reference temDerature
35、s of 15 OC and 60 OF. IS0 2715. Liquid hydrocarbons - Volumetric measurement by turbine meter systems. IS0 5024, Petroleum liquids and gases - Measurement - Standard reference conditions. IC0 7278-2, Liquid hydrocarbons - Dynamic measurement - Proving systems for volumetric meters - Part 2: Pipe pro
36、vers. 1) IS0 8222, Petroleum measurement systems - Calibration - Temperature corrections for use with volumetric reference measuring systems. IS0 9770, Petroleum products - Compressibility factors for hydrocarbons in the range a38 kg/m3 to i 074 kglm3. 1) At the stage of draft. 3 Definitions Page 5
37、EN IS0 4267-2 1995 4 Hierarchy of accuracies For the purposes of this International Standard, the following definitions apply to the terms used herein : 3.1 conditions. base volume: The volume of a prover under standard 3.2 occurs during a transfer through the meter. indicated volume: The change in
38、meter reading that 3.3 a unit of volume delivered. K-factor: The number of pulses generated by a meter for pulses generated by meter volume delivered by meter K-factor = 3.4 measurement ticket: A generalized term for the writ- ten acknowledgment of the receipt or delivery of a quantity of crude oil
39、or petroleum product, including a record of the measurement data see clause 9). It may be a form to be com- pleted, a data print-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
40、.5 meter factor: The ratio of the actual volume of liquid passed through a meter to the volume indicated by the meter. volume passed through a meter volume indicated by the meter Meter factor = 3.6 net standard volume: The total standard volume (see 3.9) minus the volume of water and sediment transf
41、erred through the meter. NOTE - For clean, refined products, the total standard volume and net standard volume are usually equal. 3.7 meter volume (see indicated volume). reading; meter reading : The instantaneous display of 3.8 standard (reference) conditions: For the measure- ment of petroleum and
42、 its products, these are a pressure of 101,325 kPa (1,01325 bar) and a temperature 15 OC, with the exception of liquids having a vapour pressure greater than at- mospheric pressure at 15 OC, in which case the standard pressure is the equilibrium vapour pressure at 15 OC see IS0 5024). 3.9 total stan
43、dard 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 for temperature and pressure. It includes all water and sediment t
44、ransferred through the meter. 4.1 Purpose and implications 4.1.1 There is an inevitable, or natural, hierarchy of ac- curacies 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. Fr
45、om this level downwards, any uncertainty 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 exis
46、ts in a higher level is unrealistic. The 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
47、in the upper levels of the hierarchy than in the lower levels. 4.2 Hierarchy 4.2.1 The hierarchy of accuracies in this standard is struc- tured, in general, as shown in table 1. 4.2.2 reporting final values for each level of the hierarchy. This standard gives rules for rounding, truncating and 5 Pri
48、ncipal correction factors 5.1 Purpose and 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
49、 liquid or metal involved; and fourth, it can more readily eliminate confu- sion, as for example the difference between the compressibility factor F of a liquid and the correction factor Cpl, which is a function of F. There are six principal correction factors employed in calcula- tions of liquid quantities. 5.1.2 The first of these six correction factors is the meter fac- tor MF, a non-dimensional value which corrects the volume in- dicated on a meter or meter accessory to the actual volume, be that volume a raw or corrected volume see clause 7). In so
