BS ISO 4266-4-2002 Petroleum and liquid petroleum products - Measurement of level and temperature in storage tanks by automatic methods - Measurement of temperature in atmospheric .pdf

1、BRITISH STANDARD BS ISO 4266-4:2002 Petroleum and liquid petroleum products Measurement of level and temperature in storage tanks by automatic methods Part 4: Measurement of temperature in atmospheric tanks ICS 75.180.30 BS ISO 4266-4:2002 This British Standard, having been prepared under the direct

2、ion 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 40920 1 National foreword This British Standard reproduces verbatim ISO 4266-4:2002 and implemen

3、ts it as the UK national standard. Together with BS ISO 4266:2002 Parts 1 to 3 and Parts 5 and 6, it supersedes BS 7812:1995 which is withdrawn.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, Static a

4、nd 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 found in the

5、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 responsible fo

6、r 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 the UK int

7、erests 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 14, an inside back cover and a back cover. The BSI copyri

8、ght date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD ISO 4266-4 First edition 2002-11-15 Reference number ISO 4266-4:2002(E) Petroleum and liquid petroleum products Measurement of level and t

9、emperature in storage tanks by automatic methods Part 4: Measurement of temperature in atmospheric tanks Ptrole et produits ptroliers liquides Mesurage du niveau et de la temprature dans les rservoirs de stockage par mthodes automatiques Partie 4: Mesurage de la temprature dans les rservoirs pressio

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14、noiss wrtif gnirmo ietI rehSO ta tserdda eheb slow or SIsO memreb ydob in toc ehtnury fo tr ehtseuqeer. ISO copyrithg fofiec tsop esaCela 65 G 1121-HCeneva 02 T.le + 22 14 10 947 11 Fxa + 14 47 2290 9 74 E-liam cpoyrigthsio.ch Web wwwsi.oc.h BSISO42664:2002iiContents Page 1 Scope . 1 2 Normative ref

15、erences . 1 3 Terms and definitions 1 4 Precautions . 2 4.1 Safety precautions . 2 4.2 Equipment precautions 2 4.3 General precautions 3 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 calibrated as a system 4 5.3.3 ATT

16、 calibrated by components . 4 5.3.4 Multiple-point ATTs . 4 5.3.5 Variable-length ATTs 4 5.3.6 Uncertainty of the reference . 4 5.4 Error caused by installation and operating conditions . 4 5.5 Overall accuracy 5 5.5.1 General . 5 5.5.2 Use of ATT for fiscal/custody transfer purposes . 5 6 Selection

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

18、spot) temperature elements . 7 8.3 Averaging temperature elements . 7 8.3.1 General . 7 8.3.2 Upper, middle and lower temperature elements . 7 8.3.3 Multiple-point temperature elements 8 8.3.4 Variable-length RTD temperature elements . 8 8.3.5 Mid-level temperature element . 8 8.3.6 Moveable spot te

19、mperature element 8 BSISO42664:2002iii8.3.7 Other methods 9 8.4 Thermowells for electronic temperature elements . 9 9 Calibration and field verification of ATTs . 11 9.1 Introduction 11 9.2 Calibration of single-point, or mid-level temperature element ATTs for fiscal/custody transfer purposes 11 9.2

20、.1 Calibration prior to installation 11 9.2.2 Initial field verification . 11 9.3 Calibration of upper, middle and lower or multiple-point ATTs for fiscal/custody transfer purposes 12 9.3.1 Calibration prior to installation 12 9.3.2 Initial field verification . 12 9.4 Calibration of variable-length

21、ATTs for fiscal/custody transfer purposes . 13 9.4.1 Calibration prior to installation 13 9.4.2 Initial field verification . 13 9.5 Subsequent verification of ATTs 13 9.5.1 General . 13 9.5.2 Frequency of subsequent verification . 13 9.5.3 Record keeping . 13 10 Data communication and receiving 13 B

22、SISO42664:2002ivForeword 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

23、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

24、) 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

25、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

26、ational Standard ISO 4266-4 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants, Subcommittee SC 3, Static petroleum measurement. ISO 4266-4, together with ISO 4266-1 to ISO 4266-3 and ISO 4266-5 and ISO 4266-6, cancels and replaces ISO 4266:1994, which has been technica

27、lly revised. ISO 4266 consists 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:

28、Measurement of level in pressurized 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) BSISO42664:2002vANRETNIITOTS LANDNADRA

29、OSI -66242002:4)E( Petroleum and liquid petroleum products Measurement of level and temperature in storage tanks by automatic methods Part 4: Measurement of temperature in atmospheric tanks 1 Scope This part of ISO 4266 gives guidance on the selection, accuracy, installation, commissioning, calibrat

30、ion and verification of automatic tank thermometers (ATTs) in fiscal/custody transfer applications in which the ATT is used for measuring the temperature of petroleum and liquid petroleum products having a Reid vapour pressure less than , stored in atmospheric storage tanks. This part of ISO 4266 is

31、 not applicable to the measurement of temperature in caverns or in refrigerated storage tanks. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 4266. For dated references, subsequent amendment

32、s to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 4266 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 th

33、e normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1998 (all parts), Petroleum industry Terminology ISO 4266-1:2002, Petroleum and liquid petroleum products Measurement of level and temperature in storage tanks by autom

34、atic methods Part 1: Measurement of level in atmospheric tanks ISO 4268:2000, Petroleum and liquid petroleum products Temperature measurements Manual methods 3 Terms and definitions For the purposes of this part of ISO 4266, the terms and definitions given in ISO 1998, and the following, apply. 3.1

35、automatic tank thermometer AT T instrument that continuously measures temperature 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 receiv

36、ing/readout device(s). 3.2 resistance temperature detector RTD electrical temperature-sensing element in common use to measure the temperature of the contents of a storage tank 100 kPa BSISO42664:200213.3 single-point ATT spot ATT ATT that measures the temperature at a particular point in a tank by

37、the spot temperature element 3.4 multiple-point ATT ATT consisting of multiple (usually 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 ave

38、rage temperature of the liquid in the tank, and may also display the temperature profile 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 a

39、verage temperature of the liquid in the tank 3.5.2 variable-length averaging ATT averaging 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, c

40、ompletely submerged temperature element to determine the average temperature of the liquid 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 sig

41、nal, and transmits the signal to a remote readout NOTE A local readout may be provided. 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

42、on safety and material-compatibility precautions should be followed when using ATT equipment. 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 precauti

43、ons 4.2.1 All of the ATT equipment should be capable of withstanding the pressure, temperature, 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 sh

44、ould be taken to ensure that all exposed metal parts of the ATT have the same electrical potential 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 A

45、ll ATT equipment should be maintained in safe operating condition and the manufacturers maintenance instructions should be complied with. BSISO42664:200224.2.6 The temperature elements should be located so that the temperature of any sediment deposits or free water bottoms that may be present in the

46、 tank is not measured. 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. 4.3.2 Tank levels should be measured at the same time as the tank temperature is measured. 4.3.3 Temperatures measured for

47、 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 (opening gauge) and after product transfer

48、 (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 ATTs may be subject to the approval of t

49、he 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 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,