BS ISO 4266-6-2002 Petroleum and liquid petroleum products - Measurement of level and temperature in storage tanks by automatic methods - Measurement of temperature in pressurized .pdf

1、BRITISH STANDARD BS ISO 4266-6:2002 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) ICS 75.180.30 BS ISO 4266-6:2002 This British Standard, having bee

2、n prepared under the direction of the Materials and Chemicals Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 9 December 2002 BSI 9 December 2002 ISBN 0 580 40922 8 National foreword This British Standard reproduces verbatim I

3、SO 4266-6:2002 and implements it as the UK national standard. Together with BS ISO 4266:2002 Parts 1 to 5, it supersedes BS 7812:1995 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee PTI/12, Petroleum measurement and sampling, to Subcommittee PTI/12/1,

4、 Static and dynamic petroleum measurement, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be foun

5、d in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are respo

6、nsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal 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 t

7、he UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary 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 11 and a back cover. The BSI copyright date disp

8、layed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD ISO 4266-6 First edition 2002-11-15 Reference number ISO 4266-6:2002(E) Petroleum and liquid petroleum products Measurement of level and temperature in

9、 storage tanks by automatic methods Part 6: Measurement of temperature in pressurized storage tanks (non-refrigerated) 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 rse

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15、age 1 Scope . 1 2 Normative reference . 1 3 Terms and definitions 1 4 Precautions . 2 4.1 Safety precautions . 2 4.2 Equipment precautions 2 4.3 General precautions 2 5 Accuracy . 3 5.1 General 3 5.2 Intrinsic error of ATTs 3 5.3 Calibration prior to installation . 3 5.3.1 General . 3 5.3.2 ATT cali

16、brated as a system 3 5.3.3 ATT calibrated by components . 4 5.3.4 Multiple-point ATTs . 4 5.3.5 Uncertainty of the reference . 4 5.4 Error caused by installation and operating conditions . 4 5.5 Overall accuracy 4 5.5.1 General . 4 5.5.2 Use of ATT for fiscal/custody transfer purposes . 4 6 Selectio

17、n of ATTs 5 6.1 General 5 6.2 ATTs for fiscal/custody transfer purpose 5 7 Description of ATT equipment 5 7.1 Introduction 5 7.2 Electrical temperature elements 6 7.2.1 Resistance temperature detectors 6 7.2.2 Other temperature elements . 6 8 Installation of ATTs . 6 8.1 General 6 8.2 Single-point (

18、spot) temperature elements . 6 8.3 Multiple-point temperature elements . 6 8.4 Moveable spot temperature element . 7 8.5 Other methods . 7 8.6 Thermowells for electronic temperature elements . 7 8.7 Thermowells for verification purposes . 7 9 Calibration and field verification of ATTs 7 9.1 Introduc

19、tion 7 9.2 Calibration of single-point temperature element ATTs used for fiscal/custody transfer purpose . 8 BSISO42666:2002iii9.2.1 Calibration prior to installation 8 9.2.2 Initial field verification . 8 9.3 Calibration of upper, middle and lower or multiple-point ATTs . 9 9.3.1 Calibration prior

20、to installation 9 9.3.2 Initial field verification . 9 9.4 Subsequent verification of ATTs 10 9.4.1 General . 10 9.4.2 Frequency of subsequent verification . 10 9.4.3 Record keeping . 10 10 Data communication and receiving 10 Bibliography. 11 BSISO42666:2002ivForeword ISO (the International Organiza

21、tion 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 subject for which a technical committee has been established

22、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) on all matters of electrotechnical standardization. In

23、ternational 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 International Standard requires approval by at least 75 % of the

24、 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. International Standard ISO 4266-6 was prepared by Technical Co

25、mmittee 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 of the following parts, under the general title Petrole

26、um 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 pressurized storage tanks (non-refrigerated) Part 4: Measureme

27、nt of temperature in atmospheric tanks Part 5: Measurement of temperature in marine vessels Part 6: Measurement of temperature in pressurized storage tanks (non-refrigerated) BSISO42666:2002vANRETNIITOTS LANDNADRA OSI -66242002:6)E( Petroleum and liquid petroleum products Measurement of level and te

28、mperature in storage tanks by automatic methods Part 6: Measurement of temperature in pressurized storage tanks (non- refrigerated) 1 Scope This part of ISO 4266 gives guidance on the selection, accuracy, installation, commissioning, calibration and verification of automatic tank thermometers (ATTs)

29、 in fiscal/custody transfer 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. 2 No

30、rmative reference The following 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 p

31、art of ISO 4266 are encouraged 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 Internat

32、ional Standards. ISO 1998 (all parts), Petroleum industry Terminology 3 Terms 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 temperatu

33、re in storage tanks NOTE An 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 tempe

34、rature-sensing element in common 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 BSISO42666:200213.4 multiple-point ATT ATT consisting of multiple (usually

35、 three or more) spot temperature elements to measure the temperature(s) at selected liquid level(s) NOTE The 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 profil

36、e in the tank. 3.5 Averaging ATT 3.5.1 multiple-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 averag

37、ing ATT consisting of several temperature elements 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 liq

38、uid in the tank 3.6 temperature transmitter 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 NOTE A local readout may be provided.

39、 Often, the function of the temperature transmitter is provided by the level transmitter of the automatic level gauge (ALG). 4 Precautions 4.1 Safety precautions International Standards and government regulations on safety and material-compatibility precautions should be followed when using ATT equi

40、pment. In addition, the manufacturers recommendations on the use and installation of the equipment should be followed. All regulations covering entry into hazardous areas should be observed. 4.2 Equipment precautions 4.2.1 All ATT equipment should be capable of withstanding the pressure, temperature

41、, operating and environmental conditions likely to be encountered in service. 4.2.2 ATTs should be certified for use in the hazardous-area classification appropriate to their installation. 4.2.3 Measures should be taken to ensure that all exposed metal parts of the ATT have the same electrical poten

42、tial as the tank. 4.2.4 All parts of the ATT in contact with the product or its vapour should be chemically compatible with the product, to avoid both product contamination and corrosion of the ATT. 4.2.5 All ATT equipment should be maintained in safe operating condition and the manufacturers mainte

43、nance instructions should be complied with. 4.3 General precautions 4.3.1 The 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. BSISO42666:200224.3.2 Tank levels should be measured at the same time as the tank temperature is meas

44、ured. 4.3.3 Temperatures measured for bulk transfer should be recorded when they are taken, unless the remote readout equipment of the ATT automatically records the temperatures periodically. 4.3.4 The same general procedures should be used to measure a tank temperature before product transfer (open

45、ing gauge) and after product transfer (closing gauge). 4.3.5 ATTs should provide security to prevent unauthorized adjustment or tampering. ATTs used in fiscal/custody transfer applications should provide facilities to allow sealing for calibration adjustment. 4.3.6 The design and installation of ATT

46、s may be subject to the approval of the national measurement organization, 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

47、to a specific series of tests and is subject to the ATT being installed 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 compatibil

48、ity and high voltage. 5 Accuracy 5.1 General The accuracy of petroleum temperatures 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. 5.2 I

49、ntrinsic 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 measurement of the ATT as installed. The calibration reference device used to calibrate the ATT should be traceable to appropriate national standards. NOTE The temperature elements and field transmitters used for fixed, aut