1、BRITISH STANDARD BS ISO 4269:2001 Petroleum and liquid petroleum products Tank calibration by liquid measurement Incremental method using volumetric meters ICS 75.180.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 4269:2001 This British Standard, having been prepared
2、 under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 June 2001 BSI 06-2001 ISBN 0 580 37589 7 National foreword This British Standard reproduces verbatim ISO 4269:2001 and implements it as t
3、he UK national standard. The UK participation in its preparation was entrusted by Technical Committee PTI/12, Petroleum measurement and sampling, to Subcommittee PTI/12/1, Static and dynamic petroleum measurement, which has the responsibility to: A list of organizations represented on this subcommit
4、tee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find
5、” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal
6、obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summ
7、ary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 26, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since pub
8、lication Amd. No. Date CommentsReference number ISO 4269:2001(E) INTERNATIONAL STANDARD ISO 4269 First edition 2001-03-15 Petroleum and liquid petroleum products Tank calibration by liquid measurement Incremental method using volumetric meters Ptrole et produits ptroliers liquides Jaugeage des rserv
9、oirs par palement Mthode par empotement utilisant des compteurs volumtriquesISO 4269:2001(E) I ii ISO 4269:2001(E)iii Contents Page Foreword.iv Introduction.v 1 Scope 1 2 Normative references 1 3 Terms and definitions .2 4 Precautions 2 5 Meters .2 6 Apparatus .4 7 Calibration procedure .5 8 Correct
10、ions to observed volumes8 9 Calculation of tank capacity tables9 10 Requirements for calculations .10 Annex A (normative) Correction for thermal effects .12 Annex B (informative) Field data and calculation sheets18ISO 4269:2001(E) iv Foreword ISO (the International Organization for Standardization)
11、is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be repres
12、ented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are
13、drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a v
14、ote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 4269 was prepared by Technical Committee ISO/TC 28, Pet
15、roleum products and lubricants, Subcommittee SC 3, Static petroleum measurement. Annex A forms a normative part of this International Standard. Annex B is for information only.ISO 4269:2001(E)v Introduction This International Standard forms part of a series on tank calibration including the followin
16、g: ISO 7507-1, ISO 7507-2, ISO 7507-3, ISO 7507-4, ISO 7507-5, ISO 7507-6, ISO 8311, ISO 9091-1 and ISO 9091-2. Liquid calibration methods may be used in the calibration of either the total or partial capacity of a tank. A high degree of accuracy may be obtained provided that great care is taken at
17、all stages of the operation. The method is particularly useful where tanks are of irregular shape, for the calibration of the bottom of any storage tank, or for the calibration of ship and barge tanks having irregular cross sections. The method offers a degree of accuracy which may exceed other meth
18、ods when used in the calibration of small tanks, especially small horizontal cylindrical tanks. The calibration liquid may be either water or a suitable petroleum product having a low volatility and viscosity. Water is recommended where wide temperature variations are expected during calibration as
19、water has a low coefficient of cubical expansion. However, the use of water may introduce unacceptable risks and difficulties depending on the use to which the tank being calibrated is to be put (e.g. the use and subsequent removal of water when used in the calibration of underground storage tanks a
20、t retail sites). In such circumstances the use of a suitable petroleum product would be preferable.INTERNATIONAL STANDARD ISO 4269:2001(E)1 Petroleum and liquid petroleum products Tank calibration by liquid measurement Incremental method using volumetric meters 1 Scope This International Standard sp
21、ecifies a method for the calibration of tanks by addition of batches of liquid. The liquid is used as a volume-transfer medium, measured accurately by means of a meter. This International Standard is not applicable to the calibration of reference measuring instruments, proving tanks, or meter prover
22、s. NOTE Applicable standards are given in the bibliography. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of
23、 these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document re
24、ferred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 91-1:1992, Petroleum measurement tables Part 1: Tables based on references temperature of 15 C and 60 F. ISO 91-2:1991, Petroleum measurement tables Part 2: Tables based on a reference temper
25、ature of 20 C. ISO 2714:1980, Liquid hydrocarbons Volumetric measurement by displacement meter systems other than dispensing pumps. ISO 2715:1981, Liquid hydrocarbons Volumetric measurement by turbine meter systems. ISO 4268, Petroleum and liquid petroleum products Temperature measurements Manual me
26、thods. ISO 7507-1:1993, Petroleum and liquid petroleum products Calibration of vertical cylindrical tanks Part 1: Strapping method. ISO/TR 7507-6:1997, Petroleum and liquid petroleum products Calibration of vertical cylindrical tanks Part 6: Recommendations for monitoring, checking and verification
27、of tank calibration and capacity tables. ISO 9770:1989, Crude petroleum and petroleum products Compressibility factors for hydrocarbons in the range 638 kg/m 3 to 1074 kg/m 3 . IEC 60079-10, Electrical apparatus for explosive gas atmospheres Part 10: Classification of hazardous areas.ISO 4269:2001(E
28、) 2 3 Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 7507-1, and the following, apply. 3.1 K-factor number of pulses generated by a meter per unit of volume passing through it 3.2 pre-set device equipment which shuts off the delivery of
29、calibration liquid to the meter after a predetermined volume has passed through the meter 4 Precautions 4.1 The general precautions and safety precautions in ISO 7507-1 and IEC 60079-10 shall apply to this International Standard. 4.2 When a petroleum product is used as the calibration liquid, the fo
30、llowing additional safety precautions, which are not exhaustive, shall be observed: a) control of sources of ignition; b) prevention of electrostatic accumulation by 1) the correct bonding of transfer hoses, 2) control of pumping speeds, 3) prevention of free fall and splashing of liquid, 4) mainten
31、ance of the velocity of the liquid in the line below 1 ms 1 until the end of the filling pipe is submerged. 5 Meters 5.1 General specifications 5.1.1 The meter shall be of the positive displacement or turbine type. 5.1.2 The meter shall be fabricated from materials suitable for the calibration liqui
32、d to be used. 5.1.3 The meter shall be selected so that the flow rate, at which the meter will operate during the tank calibration, is within the linear range of the meter factor curve of the meter. The meter should either be fitted with a flow-rate indicator, or average flow rates should be calcula
33、ted by timing deliveries by means of a stop watch. 5.1.4 The meter shall have either a device giving a read-out in volumetric units or an electronic pulse counter used to calculate volume. To enable the required repeatability to be determined during the proving of the meter, and depending on the vol
34、ume passed by the meter during such proving, a special counter or other indicator capable of being read to a fraction of the unit of volume should be provided.ISO 4269:2001(E)3 5.1.5 A volumetric proving tank, a pipe prover or a small volume prover, suitable for use with the type of meter chosen, sh
35、all be provided for calibrating the meter. The selected apparatus shall be provided with a calibration certificate showing any corrections which may be required when in use. 5.1.6 A thermowell (thermometer pocket) shall be provided in the metering system adjacent to the meter. To ensure adequate imm
36、ersion and thermal response, and to avoid undesirable thermal conduction effects from the pipe wall, it is recommended that, particularly in the case of small diameter lines, the pocket should be installed in the body of the meter if a positive displacement meter is used. If a turbine meter is used,
37、 then the thermowell shall be installed in the pipework at least five pipe diameters downstream of the meter position. The thermowell should be in direct contact with the calibration liquid and should be filled with a light oil to aid thermal response. The thermowell, and the fitting in which the se
38、nsitive element of the thermometer is immersed, should be designed in accordance with sound thermo-technical principles. It may be desirable to provide external insulation round the pipe or fitting at the position of, and adjacent to, the thermowell. 5.1.7 A rapid operating valve or shut off device
39、shall be installed downstream of the meter (see 6.4.5). 5.2 Positive displacement meters The meter factor shall not deviate by more than 0,20 % from the average meter factor between 10 % and 100 % of the maximum rated flow rate of the meter. 5.3 Turbine meters 5.3.1 The K-factor shall not deviate by
40、 more than 0,20 % between 10 % and 100 % of the maximum capacity of the meter. 5.3.2 A back pressure in excess of 100 kPa (gauge) shall be applied in order to prevent cavitation. 5.4 Selection of meter 5.4.1 The selection of a meter for tank calibration is contingent on the following: a) the operati
41、ng rate of flow to be used when calibrating the tank (see 5.4.4); b) the maximum pressure to which the meter will be subjected; c) the liquid which the meter is required to measure (see 5.1.2); d) the temperature range over which the meter will operate; e) the range of viscosities over which the met
42、er will operate. 5.4.2 Meters incorporating a temperature compensator shall not be used for tank calibration. 5.4.3 The meter shall be provided with a meter factor or K-factor curve (errorflow curve) for the type of liquid, viscosity, temperature and range of flow rates over which it will be used. 5
43、.4.4 The repeatability of the meter shall be such that the results of five consecutive proving runs shall be within ara n geo f 0,025 % of the average after correcting for temperature, pressure and viscosity. 5.4.5 Meters shall be installed and operated in accordance with the appropriate recommendat
44、ions contained in ISO 2714 or ISO 2715.ISO 4269:2001(E) 4 6 Apparatus 6.1 Dip-tape and dip-weight This shall be as specified in ISO 7507-1:1993, B.6 and B.7. 6.2 Ullage paste NOTE The term “oil-finding paste“ is synonymous. 6.3 Water-finding paste 6.4 Ancillary equipment 6.4.1 Air/vapour separator A
45、n air separator, when utilized, shall be fitted upstream of the meter. A back-pressure valve may be required to maintain an adequate pressure drop across the air release valve fitted to the air separator. 6.4.2 Flow limiter A flow limiting device shall be fitted in the line, downstream of the meter,
46、 to limit the rate of flow if the pressure of the calibration liquid supply is such that the flow rate through the installation is too great for the rated capacity of the meter. 6.4.3 Pre-set device The pre-set device should be leak proof and operate quickly with a smooth action, without causing any
47、 undue pressure surge. 6.4.4 Pressure gauge Where a positive displacement meter is used, a pressure gauge shall be mounted in the line as close to the meter as possible, preferably on the downstream side. Where a turbine meter is used, a pressure gauge shall be installed at least five pipe diameters
48、 downstream from the meter. It may be preferable that two pressure gauges are installed equidistant from the meter upstream and downstream 6.4.5 Shut-off valve The valve shall be leak proof, and shall operate quickly with a smooth action and without causing an undue pressure surge. If a pre-set devi
49、ce is not fitted, a shut-off valve, to shut off the flow at the required intervals, shall be installed downstream of the meter. 6.4.6 Strainer 6.4.7 Surge suppressor If surge pressures are likely to occur, a suitable surge suppressor should be fitted to the line. 6.4.8 Syphon breaker If fitted, the syphon breaker shall be downstream of the meter as close to the delivery point as is possible. When a tank is being calibrated by top filling, then the syphon breaker should be installed in conjunction with a weir. The assembly should be
