《ISO-4266-6-2002.pdf》由会员分享，可在线阅读，更多相关《ISO-4266-6-2002.pdf（18页珍藏版）》请在三一文库上搜索。
1、INTERNATIONAL STANDARD ISO 4266-6 First edition 2002-11-15 Reference number ISO 4266-6:2002(E) ISO 2002 Petroleum and liquid petroleum products Measurement of level and temperature in storage tanks by automatic methods Part 6: Measurement of temperature in pressurized storage tanks (non-refrigerated
2、) Ptrole et produits ptroliers liquides Mesurage du niveau et de la temprature dans les rservoirs de stockage par mthodes automatiques Partie 6: Mesurage de la temprature dans les rservoirs de stockage sous pression (non rfrigrs) Copyright International Organization for Standardization Provided by I
3、HS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:44 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4266-6:2002(E) ii ISO 2002 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In ac
4、cordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes
5、 licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for pr
6、inting. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2002 All rights reserved. Unless otherwise specified, no part of thi
7、s 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 ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-121
8、1 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 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:44 MDT
9、No reproduction or networking permitted without license from IHS -,-,- ISO 4266-6:2002(E) ISO 2002 All rights reserved iii Contents Page 1Scope . 1 2Normative reference . 1 3Terms and definitions 1 4Precautions . 2 4.1Safety precautions . 2 4.2Equipment precautions 2 4.3General precautions 2 5Accura
10、cy . 3 5.1General 3 5.2Intrinsic error of ATTs 3 5.3Calibration prior to installation . 3 5.3.1General . 3 5.3.2ATT calibrated as a system 3 5.3.3ATT calibrated by components . 4 5.3.4Multiple-point ATTs . 4 5.3.5Uncertainty of the reference . 4 5.4Error caused by installation and operating conditio
11、ns . 4 5.5Overall accuracy 4 5.5.1General . 4 5.5.2Use of ATT for fiscal/custody transfer purposes . 4 6Selection of ATTs 5 6.1General 5 6.2ATTs for fiscal/custody transfer purpose 5 7Description of ATT equipment 5 7.1Introduction 5 7.2Electrical temperature elements 6 7.2.1Resistance temperature de
12、tectors 6 7.2.2Other temperature elements . 6 8Installation of ATTs . 6 8.1General 6 8.2Single-point (spot) temperature elements . 6 8.3Multiple-point temperature elements . 6 8.4Moveable spot temperature element . 7 8.5Other methods . 7 8.6Thermowells for electronic temperature elements . 7 8.7Ther
13、mowells for verification purposes . 7 9Calibration and field verification of ATTs 7 9.1Introduction 7 9.2Calibration of single-point temperature element ATTs used for fiscal/custody transfer purpose . 8 Copyright International Organization for Standardization Provided by IHS under license with ISO L
14、icensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:44 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4266-6:2002(E) iv ISO 2002 All rights reserved 9.2.1Calibration prior to installation 8 9.2.2Initial field verification . 8 9.3Calibration o
15、f upper, middle and lower or multiple-point ATTs . 9 9.3.1Calibration prior to installation 9 9.3.2Initial field verification . 9 9.4Subsequent verification of ATTs 10 9.4.1General . 10 9.4.2Frequency of subsequent verification . 10 9.4.3Record keeping . 10 10Data communication and receiving 10 Bibl
16、iography. 11 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:44 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4266-6:2002(E) ISO 2002 All ri
17、ghts reserved v 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 interested in a subje
18、ct 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 Commission (IEC
19、) 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 as an Internat
20、ional 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 part of ISO 4266 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Intern
21、ational Standard ISO 4266-6 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants, Subcommittee SC 3, Static petroleum measurement. ISO 4266-6, together with ISO 4266-1 to ISO 4266-5, cancels and replaces ISO 4266:1994, which has been technically revised. ISO 4266 consists
22、 of the following parts, under the general title Petroleum and liquid petroleum products Measurement of level and temperature in storage tanks by automatic methods: Part 1: Measurement of level in atmospheric tanks Part 2: Measurement of level in marine vessels Part 3: Measurement of level in pressu
23、rized storage tanks (non-refrigerated) Part 4: Measurement of temperature in atmospheric tanks Part 5: Measurement of temperature in marine vessels Part 6: Measurement of temperature in pressurized storage tanks (non-refrigerated) Copyright International Organization for Standardization Provided by
24、IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:44 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Techni
25、cal Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:44 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARDISO 4266-6:2002(E) ISO 2002 All rights reserved 1 Petroleum and liquid petroleum products Measurement of level and temperature in storage tan
26、ks by automatic methods Part 6: Measurement of temperature in pressurized storage tanks (non- refrigerated) 1Scope This part of ISO 4266 gives guidance on the selection, accuracy, installation, commissioning, calibration and verification of automatic tank thermometers (ATTs) in fiscal/custody transf
27、er applications in which the ATT is used for measuring the temperature of petroleum and liquid petroleum products, stored in pressurized storage tanks. This part of ISO 4266 is not applicable to the measurement of temperature in caverns or in refrigerated storage tanks. 2Normative reference The foll
28、owing normative document contains provisions which, through reference in this text, constitute provisions of this part of ISO 4266. For dated references, subsequent amendments to, or revisions of, this publication do not apply. However, parties to agreements based on this part of ISO 4266 are encour
29、aged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1998
30、(all parts), Petroleum industry Terminology 3Terms and definitions For the purposes of this part of ISO 4266, the following terms and definitions given in ISO 1998, and the following, apply. 3.1 automatic tank thermometer ATT instrument that continuously measures temperature in storage tanks NOTEAn
31、ATT, which may also be known as an automatic tank temperature system, typically includes precision temperature sensors, field-mounted transmitters for electronic signal transmission, and receiving/readout device(s). 3.2 resistance temperature detector RTD electrical temperature-sensing element in co
32、mmon use to measure the temperature of the contents of a storage tank 3.3 single-point ATT spot ATT ATT that measures the temperature at a particular point in a tank by the spot temperature element Copyright International Organization for Standardization Provided by IHS under license with ISO Licens
33、ee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:44 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4266-6:2002(E) 2 ISO 2002 All rights reserved 3.4 multiple-point ATT ATT consisting of multiple (usually three or more) spot temperature elements
34、 to measure the temperature(s) at selected liquid level(s) NOTEThe readout equipment should average the readings from the submerged temperature elements to compute the average temperature of the liquid in the tank, and may also display the temperature profile in the tank. 3.5Averaging ATT 3.5.1 mult
35、iple-point averaging ATT averaging ATT where the readout equipment selects the individual, spot temperature element(s) that are submerged in the liquid to determine the average temperature of the liquid in the tank 3.5.2 variable-length averaging ATT averaging ATT consisting of several temperature e
36、lements of varying length, with all the elements extending upwards from a position close to the bottom of the tank, and where the readout equipment selects the longest, completely submerged temperature element to determine the average temperature of the liquid in the tank 3.6 temperature transmitter
37、 instrument that typically provides electrical power to the temperature element(s), converts the temperature measured by the element(s) to an electrical or electronic signal, and transmits the signal to a remote readout NOTEA local readout may be provided. Often, the function of the temperature tran
38、smitter is provided by the level transmitter of the automatic level gauge (ALG). 4Precautions 4.1Safety precautions International Standards and government regulations on safety and material-compatibility precautions should be followed when using ATT equipment. In addition, the manufacturers recommen
39、dations on the use and installation of the equipment should be followed. All regulations covering entry into hazardous areas should be observed. 4.2Equipment precautions 4.2.1All ATT equipment should be capable of withstanding the pressure, temperature, operating and environmental conditions likely
40、to be encountered in service. 4.2.2ATTs should be certified for use in the hazardous-area classification appropriate to their installation. 4.2.3Measures should be taken to ensure that all exposed metal parts of the ATT have the same electrical potential as the tank. 4.2.4All parts of the ATT in con
41、tact with the product or its vapour should be chemically compatible with the product, to avoid both product contamination and corrosion of the ATT. 4.2.5All ATT equipment should be maintained in safe operating condition and the manufacturers maintenance instructions should be complied with. 4.3Gener
42、al precautions 4.3.1The general precautions given in 4.3.2 to 4.3.6 apply to all types of ATTs and should be observed where they are applicable. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resa
43、le, 04/20/2007 04:31:44 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4266-6:2002(E) ISO 2002 All rights reserved 3 4.3.2Tank levels should be measured at the same time as the tank temperature is measured. 4.3.3Temperatures measured for bulk transfer should be recorde
44、d when they are taken, unless the remote readout equipment of the ATT automatically records the temperatures periodically. 4.3.4The same general procedures should be used to measure a tank temperature before product transfer (opening gauge) and after product transfer (closing gauge). 4.3.5ATTs shoul
45、d provide security to prevent unauthorized adjustment or tampering. ATTs used in fiscal/custody transfer applications should provide facilities to allow sealing for calibration adjustment. 4.3.6The design and installation of ATTs may be subject to the approval of the national measurement organizatio
46、n, who will normally have issued a type or pattern approval (“Type Approval”) for the design of the ATT for the particular service for which it is to be employed. Type approval is normally issued after an ATT has been subjected to a specific series of tests and is subject to the ATT being installed
47、in an approved manner. Type approval tests may include the following: visual inspection, performance, vibration, humidity, dry heat, inclination, fluctuations in power supplies, insulation, resistance, electromagnetic compatibility and high voltage. 5Accuracy 5.1General The accuracy of petroleum tem
48、peratures taken by the ATTs should be consistent with the accuracy of the levels taken by the automatic tank-level gauging system so that the overall accuracy of the standard volume measurement is not seriously degraded. 5.2Intrinsic error of ATTs The intrinsic error of the ATT, i.e. the accuracy of the ATTs when tested under controlled conditions as specified by the manufacturer, can be a major component of the uncertainty of the temperature measu