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1、Reference number ISO 4269:2001(E) ISO 2001 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 rservoirs par palement Mtho
2、de par empotement utilisant des compteurs volumtriques Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/12/2007 21:20:12 MDTNo reproduction or networking permitted without license from IH
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6、dress given below. ISO 2001 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or IS
7、Os member body in the country of the requester. ISO copyright office Case postale 56 ? CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2001 All rights reserved Copyright International Organization for Standardization
8、Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/12/2007 21:20:12 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4269:2001(E) ISO 2001 All rights reservediii ContentsPage Foreword.iv Introduction.v 1Scope 1 2Norma
9、tive references1 3Terms and definitions .2 4Precautions 2 5Meters .2 6Apparatus.4 7Calibration procedure .5 8Corrections to observed volumes8 9Calculation of tank capacity tables9 10Requirements for calculations.10 Annex A (normative) Correction for thermal effects.12 Annex B (informative) Field dat
10、a and calculation sheets18 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/12/2007 21:20:12 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4269:2001(E) iv
11、ISO 2001 All rights reserved Foreword ISO (the International Organization for Standardization) 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 interest
12、ed in a subject for which a technical committee has been established 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. ISO collaborates closely with the International Electrotechnical Co
13、mmission (IEC) on all matters of electrotechnical standardization. International Standards are 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 a
14、s an International Standard requires approval by at least 75 % of the member bodies casting a vote. 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 pa
15、tent rights. International Standard ISO 4269 was prepared by Technical Committee ISO/TC 28, Petroleum 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. Copyright International Orga
16、nization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/12/2007 21:20:12 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4269:2001(E) ISO 2001 All rights reservedv Introduction This Internatio
17、nal Standard forms part of a series on tank calibration including the following: ISO 7507-1,ISO 7507-2,ISO 7507-3,ISO 7507-4,ISO 7507-5,ISO 7507-6,ISO 8311,ISO 9091-1and ISO 9091-2. Liquid calibration methods may be used in the calibration of either the total or partial capacity of a tank. A high de
18、gree of accuracy may be obtained provided that great care is taken at 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 sectio
19、ns. The method offers a degree of accuracy which may exceed other methods 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
20、 where wide temperature variations are expected during calibration as 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 remova
21、l of water when used in the calibration of underground storage tanks at retail sites). In such circumstances the use of a suitable petroleum product would be preferable. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards
22、1/9972545001 Not for Resale, 04/12/2007 21:20:12 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/12/2007 21:20:1
23、2 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARDISO 4269:2001(E) ISO 2001 All rights reserved1 Petroleum and liquid petroleum products Tank calibration by liquid measurement Incremental method using volumetric meters 1Scope This International Standar
24、d specifies 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 pr
25、overs. NOTEApplicable standards are given in the bibliography. 2Normative 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
26、of 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
27、referred 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 temp
28、erature 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
29、methods. 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 verificatio
30、n of tank calibration and capacity tables. ISO 9770:1989, Crude petroleum and petroleum products Compressibility factors for hydrocarbons in the range 638 kg/m3to 1074 kg/m3. IEC 60079-10, Electrical apparatus for explosive gas atmospheres Part 10: Classification of hazardous areas. Copyright Intern
31、ational Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/12/2007 21:20:12 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4269:2001(E) 2 ISO 2001 All rights reserved 3Terms and defi
32、nitions 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 calibration liquid t
33、o the meter after a predetermined volume has passed through the meter 4Precautions 4.1The general precautions and safety precautions in ISO 7507-1 and IEC 60079-10 shall apply to this International Standard. 4.2When a petroleum product is used as the calibration liquid, the following additional safe
34、ty 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)maintenance of the velocity of the l
35、iquid in the line below 1 ms1until the end of the filling pipe is submerged. 5Meters 5.1General specifications 5.1.1The meter shall be of the positive displacement or turbine type. 5.1.2The meter shall be fabricated from materials suitable for the calibration liquid to be used. 5.1.3The meter shall
36、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 calculated by timing deliveries by means of
37、 a stop watch. 5.1.4The 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 volume passed by the meter during such p
38、roving, a special counter or other indicator capable of being read to a fraction of the unit of volume should be provided. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/12/2007 21:20:1
39、2 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4269:2001(E) ISO 2001 All rights reserved3 5.1.5A volumetric proving tank, a pipe prover or a small volume prover, suitable for use with the type of meter chosen, shall be provided for calibrating the meter. The selected
40、 apparatus shall be provided with a calibration certificate showing any corrections which may be required when in use. 5.1.6A thermowell (thermometer pocket) shall be provided in the metering system adjacent to the meter. To ensure adequate immersion and thermal response, and to avoid undesirable th
41、ermal 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, then the thermowell shall be installed in the pipework
42、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 sensitive element of the thermometer is immersed, should b
43、e 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. 5.1.7A rapid operating valve or shut off device shall be installed downstream of the meter (see 6.4.5). 5
44、.2Positive 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. 5.3Turbine meters 5.3.1The K-factor shall not deviate by more than?0,20 % between 10 % and 100 % of the maximum capa
45、city of the meter. 5.3.2A back pressure in excess of 100 kPa (gauge) shall be applied in order to prevent cavitation. 5.4Selection of meter 5.4.1The selection of a meter for tank calibration is contingent on the following: a)the operating rate of flow to be used when calibrating the tank (see 5.4.4)
46、; 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 meter will operate. 5.4.2Meters incorporating a temperature compensator
47、 shall not be used for tank calibration. 5.4.3The 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. 5.4.4The repeatability of the meter shall be such that the results of f
48、ive consecutive proving runs shall be within a range of?0,025 % of the average after correcting for temperature, pressure and viscosity. 5.4.5Meters shall be installed and operated in accordance with the appropriate recommendations contained in ISO 2714 or ISO 2715. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/12/2007 21:20:12 MDTNo reproduction or net