1、BS ISO 12917-1:2017Petroleum and liquidpetroleum products Calibration of horizontalcylindrical tanksPart 1: Manual methodsBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 12917-1:2017 BRITISH STANDARDNational forewordThis British Standard is the UK implementati
2、on of ISO 12917-1:2017.It supersedes BS ISO 12917-1:2002 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PTI/12, Petroleum Measurement and Sampling.A list of organizations represented on this committee can beobtained on request to its secretary.This pub
3、lication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2017. Published by BSI Standards Limited 2017ISBN 978 0 580 84334 1ICS 75.180.30Compliance with a British Standard cannot confer immunit
4、y fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2017.Amendments/corrigenda issued since publicationDate Text affectedBS ISO 12917-1:2017 ISO 2017Petroleum and liquid petroleum products Calibration of horizontal
5、 cylindrical tanks Part 1: Manual methodsPtrole et produits ptroliers liquides Jaugeage des rservoirs cylindriques horizontaux Partie 1: Mthodes manuellesINTERNATIONAL STANDARDISO12917-1Second edition2017-03Reference numberISO 12917-1:2017(E)BS ISO 12917-1:2017ISO 12917-1:2017(E)ii ISO 2017 All righ
6、ts reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or
7、an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.
8、orgwww.iso.orgBS ISO 12917-1:2017ISO 12917-1:2017(E)Foreword vIntroduction vi1 Scope . 12 Normative references 13 Terms and definitions . 14 Precautions 14.1 General . 14.2 Internal method . 24.3 External method 25 Equipment . 25.1 Equipment as used in ISO 7507-1 25.2 Telescopic rod 25.3 Distance me
9、ter 25.4 Leveller 26 General requirements . 27 Calibration procedures 37.1 General . 37.2 Measurement of circumferences External . 37.2.1 Introduction . 37.2.2 General 37.2.3 Repetition of measurements . 47.3 Measurement of circumferences Internal 57.3.1 Overview . 57.3.2 General 57.4 Measurements o
10、f lengths . 57.4.1 Method 57.4.2 Length of horizontal cylinder . 67.4.3 Lengths of segments . 67.4.4 Lengths of heads 77.4.5 Gauge lengths 77.4.6 Measurement/calculations of radii of the heads . 77.5 Tank tilt 77.6 Plate thickness. 87.7 Reference height 87.8 Deadwood 87.9 Measurements of temperature
11、 and pressure . 88 Re-calibration 89 Descriptive data . 910 Computation of tank capacity table .1010.1 General rules 1010.2 Accuracy of volume 1010.2.1 General. 1010.2.2 Calculation parameters . 1010.2.3 Volume calculation 1310.3 Corrections of volume of tank table . 2210.3.1 General. 2210.3.2 Worki
12、ng pressure .2210.3.3 Tank-shell temperature . 2410.4 Deadwood . 2410.5 Calibration table at gauged levels 24 ISO 2017 All rights reserved iiiContents PageBS ISO 12917-1:2017ISO 12917-1:2017(E)Annex A (informative) Computation of tank capacity tables based on individual segment dimensions 26Annex B
13、(informative) Calculation examples .29Annex C (informative) Calibration uncertainties .39Bibliography .46iv ISO 2017 All rights reservedBS ISO 12917-1:2017ISO 12917-1:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO m
14、ember 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 represented on that committee. International organizations, governm
15、ental 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.The procedures used to develop this document and those intended for its further maintenanc
16、e are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attenti
17、on is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction a
18、nd/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms
19、and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 2
20、8, Petroleum products and lubricants, Subcommittee SC 2, Measurement of petroleum and related products.This second edition cancels and replaces the first edition (ISO 12917-1:2002), which has been technically revised with the following changes. The total length of the tanks has been limited and also
21、 only the calibration via ISO 7507-1 is described in order to improve precision. Most of the figures have been improved in order to further clarify the measurement procedures. These, in turn, have been described more logically and in a more useful order. For instance, tank shell measurements are no
22、longer described separately and the former Annex on “tilt” has been incorporated in the text. A new annex on calibration uncertainties has been added. Correction for tank tilt is now calculated rather than read from a figure.It also incorporates the Technical Corrigendum ISO 12917-1:2002/Cor 1:2009.
23、A list of parts in the ISO 12917 series can be found on the ISO website. ISO 2017 All rights reserved vBS ISO 12917-1:2017ISO 12917-1:2017(E)IntroductionThis document forms part of a series on tank calibration methods. In some countries, some or all of the items covered by this document are subject
24、to local regulations. The attention of the user is drawn to the fact that it is possible that differences exist between this document and those regulations.vi ISO 2017 All rights reservedBS ISO 12917-1:2017Petroleum and liquid petroleum products Calibration of horizontal cylindrical tanks Part 1: Ma
25、nual methods1 ScopeThis document specifies manual methods for the calibration of nominally horizontal cylindrical tanks, installed at fixed locations.The methods in this document are applicable to insulated and non-insulated tanks, either when they are above-ground or underground. The methods are ap
26、plicable to pressurized tanks and to both knuckle-dish-end and flat-end cylindrical tanks as well as elliptical and spherical head tanks.This document is applicable to tanks inclined from the horizontal, provided a correction is applied for the measured tilt.Although this document does not impose an
27、y limits on the maximum tank diameter and maximum tank tilt to which this document is applicable, the practical limits would be about 4 m in diameter and 10 in tilt.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes r
28、equirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 7507-1:2001, Petroleum and liquid petroleum products Calibration of vertical cylindrical tanks Part 1: Stra
29、pping method3 Terms and definitionsNo terms and definitions are listed in this document.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h
30、t t p :/ www .iso .org/ obp4 Precautions4.1 GeneralThe general and safety precautions specified in ISO 7507-1 shall be applied.INTERNATIONAL STANDARD ISO 12917-1:2017(E) ISO 2017 All rights reserved 1BS ISO 12917-1:2017ISO 12917-1:2017(E)4.2 Internal methodBefore a tank which is to be calibrated is
31、entered, a safe-entry certificate shall be obtained. All lines entering the tank shall be disconnected and blanked.NOTE The attention of the user is drawn to the possible existence of local regulations regarding the safe-entry certificate and entry into tanks, which have contained leaded fuels.4.3 E
32、xternal methodNOTE The attention of the user is drawn to the possible existence of local regulations regarding entry to the tank area.5 Equipment5.1 Equipment as used in ISO 7507-1Equipment used in the calibration of horizontal tanks shall conform to the specifications laid down in ISO 7507-1. All e
33、quipment shall be traceable to a reference standard.NOTE The equipment required to carry out the calibration is dependent on the method to be employed. This document uses techniques and equipment described in ISO 7507-1.5.2 Telescopic rodFor the internal method, in addition to the equipment mentione
34、d in 5.1, a telescopic rod may be used. This telescopic rod shall have a scale capable of being read to 1 mm, and shall be calibrated with an uncertainty of less than 1 mm.5.3 Distance meterFor the internal method, as an alternative to a telescopic rod, a laser-based distance meter may be used. The
35、distance meter may also be used in measurement of tank tilt. This distance meter shall have a scale capable of being read to 1 mm, and shall be calibrated with an uncertainty of less than 1 mm.5.4 LevellerLevel-measuring instrument used to determine vertical distances between pairs of points. It can
36、 be based on either mechanical or optical measurements.Example Rotating optical/laser instrument that establishes horizontal reference line/plane, with a mechanical height-measuring device.6 General requirements6.1 The tank shall be filled to its normal working capacity and working pressure at least
37、 once and allowed to stand while full for at least 24 h prior to emptying and preparing it for calibration.NOTE The hydrostatic test applied to new or repaired tanks will satisfy this requirement when additional pressure tests have been carried out.6.2 The following parameters shall be determined: t
38、ilt; deadwood;2 ISO 2017 All rights reservedBS ISO 12917-1:2017ISO 12917-1:2017(E) temperature; pressure; position of gauge point, reference height and height of the dip plate, if there is one.7 Calibration procedures7.1 GeneralThe calibration procedures for calibration of horizontal cylindrical tan
39、ks shall be performed as specified in 7.2 (external measurements) and 7.3 (internal measurements). The remainder of Clause 7 applies to both external and internal measurements.For both methods, measurements shall be taken at around 1/4 and 3/4 of the length of each segment in accordance with Figure
40、1.7.2 Measurement of circumferences External7.2.1 IntroductionExternal measurements may be executed with any depth of liquid and liquid pressure in the tank. The temperature and pressure of the liquid at the time of calibration shall be recorded.7.2.2 GeneralFor the measurement procedures, a circumf
41、erential tape of sufficient length to completely encircle the tank should be used and measurements of the total circumference shall be taken.a) In all cases, the tape to be used should be applied to the tank surface at the prescribed locations by the wraparound procedure; i.e. the required length of
42、 tape should be applied in a slack condition, positioned, and tightened by the application of the proper tension.As indicated in Figure 1, strapping should be undertaken around 1/4 and 3/4 of the segment length.b) In the case in which the circumferential measuring tape is in contact with the tank su
43、rface at all points along its path, circumferential measurements should be made and checked in accordance with the relevant procedure given in ISO 7507-1.c) If the circumferential measuring tape is not in contact with the tank surface, corrections should be made for individual obstructions as specif
44、ied in ISO 7507-1. ISO 2017 All rights reserved 3BS ISO 12917-1:2017ISO 12917-1:2017(E)WWcWi1/4 (Wi)3/4 (Wi)Weld lineDWftCircumference strappingWg976b WebHgWetHgKeyD tank diameterHgdip plate heightHgreference (gauge) heightWccylinder lengthWisegment lengthWftstraight flange length (top of tank)Wfbst
45、raight flange length (bottom of tank)Wethead length (top of tank)Webhead length (bottom of tank)W total tank lengthFigure 1 Measurements of the diameters/circumferences7.2.3 Repetition of measurementsAfter the circumference has been measured, the tension shall be released and the tape brought again
46、to the required level and tension. The readings shall then be repeated and recorded.Take multiple measurements of the circumference. Investigate and, if necessary, remove the perceived outliers. If the first three consecutive measurements agree within 3 mm, take their average as the circumference an
47、d their standard deviation as the standard uncertainty. If they do not agree within this tolerance, repeat the measurements until two standard deviations of the mean of all measurements is less than the half of this tolerance. Use the average as the measured circumference and the standard deviation
48、as the standard uncertainty.4 ISO 2017 All rights reservedBS ISO 12917-1:2017ISO 12917-1:2017(E)7.3 Measurement of circumferences Internal7.3.1 OverviewInternal measurements shall be performed with the tank empty, at ambient temperature and with no pressure in the tank. In-tank temperature at the ti
49、me of calibration shall be recorded. There is no need to do pressure recording or corrections unless the reference conditions for the tank require it.7.3.2 GeneralFor the measurement procedures, a telescopic rod (5.2) of sufficient length to completely measure the internal diameter of the tank or the distance meter (5.3) shall be used.NOTE Distance meter is normally preferable for tanks with diameters exceeding 3 m.The telescopic rod or the distance meter shall be applied to the tank at the prescribed
