BS ISO 4266-5-2002 Petroleum and liquid petroleum products - Measurement of level and temperature in storage tanks by automatic methods - Measurement of temperature in marine vesse.pdf

1、BRITISH STANDARD BS ISO 4266-5:2002 Petroleum and liquid petroleum products Measurement of level and temperature in storage tanks by automatic methods Part 5: Measurement of temperature in marine vessels ICS 75.180.30 BS ISO 4266-5:2002 This British Standard, having been prepared under the direction

2、 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 40921 X National foreword This British Standard reproduces verbatim ISO 4266-5:2002 and implements

3、it as the UK national standard. Together with BS ISO 4266:2002 Parts 1 to 4 and Part 6, it supersedes BS 7812:1995 which is withdrawn.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 and dynamic

4、 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 BSI Catalo

5、gue 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 for its corr

6、ect 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 interests inf

7、ormed; 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 12, an inside back cover and a back cover. The BSI copyright date d

8、isplayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD ISO 4266-5 First edition 2002-11-15 Reference number ISO 4266-5:2002(E) Petroleum and liquid petroleum products Measurement of level and temperature

9、 in storage tanks by automatic methods Part 5: Measurement of temperature in marine vessels Ptrole et produits ptroliers liquides Mesurage du niveau et de la temprature dans les rservoirs de stockage par mthodes automatiques Partie 5: Mesurage de la temprature dans les citernes de navireBSISO42665:2

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14、hSO 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 BSISO42665:2002iiContents Page 1 Scope . 1 2 Normative reference . 1 3 Terms and def

15、initions 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 calibrated as a system 3 5.3.3 ATT calibrated by components .

16、 3 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 Selection of ATTs 5 6.1 General 5 6.2 ATTs for fiscal/custody tra

17、nsfer purpose 5 7 Description of ATT equipment Electrical temperature elements 5 7.1 Resistance temperature detectors . 5 7.2 Other temperature elements 6 8 Installation of marine ATTs . 6 8.1 General 6 8.2 Location of temperature-sensing element(s) . 6 8.3 Location of manual (temperature) gauge hat

18、ch . 6 8.4 Temperature measurement of inerted tanks 6 9 Calibration and on-board verification of marine ATTs . 6 9.1 Introduction 6 9.2 Calibration of single-point temperature element ATTs for fiscal/custody transfer purposes 7 9.2.1 Calibration prior to installation 7 9.2.2 Initial verification at

19、shipyard or during sea trials 7 9.3 Calibration of multiple-point ATTs for fiscal/custody transfer purposes . 8 9.3.1 Calibration prior to installation 8 9.3.2 Initial on-board verification at shipyard or during sea trials . 8 BSISO42665:2002iii9.4 Subsequent verification of ATTs 9 9.4.1 General . 9

20、 9.4.2 Frequency of subsequent verification . 9 9.4.3 Record keeping . 9 10 Data communication and receiving 9 Annex A Accuracy limitations of tank-temperature measurements on board marine vessels . 11 Bibliography. 12 BSISO42665:2002ivForeword ISO (the International Organization for Standardization

21、) 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 has the right to be repr

22、esented 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. International Standards ar

23、e 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 member bodies casting a

24、 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 4266-5 was prepared by Technical Committee ISO/TC 28, Petro

25、leum products and lubricants, Subcommittee SC 3, Static petroleum measurement. ISO 4266-5, together with ISO 4266-1 to ISO 4266-4 and also ISO 4266-6, cancels and replaces ISO 4266:1994, which has been technically revised. ISO 4266 consists of the following parts, under the general title Petroleum a

26、nd 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: Measurement o

27、f temperature in atmospheric tanks Part 5: Measurement of temperature in marine vessels Part 6: Measurement of temperature in pressurized storage tanks (non-refrigerated) Annex A of this part of ISO 4266 is for information only. BSISO42665:2002vANRETNIITOTS LANDNADRA OSI -66242002:5)E( Petroleum and

28、 liquid petroleum products Measurement of level and temperature in storage tanks by automatic methods Part 5: Measurement of temperature in marine vessels 1 Scope This part of ISO 4266 gives guidance on the selection, accuracy, installation, commissioning, calibration and verification of automatic t

29、ank 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 cargo tanks on board marine vessels. This part of ISO 4266 is not applicable to the me

30、asurement of temperature in refrigerated storage tanks, or pressurized cargo tanks on board marine vessels. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this part of ISO 4266. For dated references, subseque

31、nt amendments to, or revisions of, this publication 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 edition of the normative document indicated below. For undated references, the latest edition of t

32、he normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1998 (all parts), Petroleum industry Terminology 3 Terms and definitions For the purposes of this part of ISO 4266, the terms and definitions given in ISO 1998, and th

33、e following, apply. 3.1 automatic tank thermometer ATT instrument that continuously measures temperature in storage (or cargo) tanks NOTE A marine ATT, which may also be known as an automatic tank temperature system, typically includes precision temperature sensors, deck-mounted transmitters for ele

34、ctronic signal transmission, and receiving/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 3.3 single-point ATT spot ATT ATT that measures the temperature at a particular poin

35、t in a tank by the spot temperature element 100 kPa BSISO42665:200213.4 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

36、temperature elements to compute the average temperature of the liquid in the tank and may also display the temperature profile in the tank. 3.5 temperature transmitter instrument that typically provides electrical power to the temperature element(s), converts the temperature measured by the element(

37、s) to an electrical or electronic signal, 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

38、Standards, government regulations, classification society rules and ISGOTT regulations on safety and material-compatibility precautions should be followed when using marine ATT equipment. In addition, the manufacturers recommendations on the use and installation of the equipment should be followed.

39、All regulations covering entry into hazardous areas should be observed. 4.2 Equipment precautions 4.2.1 All marine ATTs should be capable of withstanding the pressure, temperature and other environmental conditions likely to be encountered in marine service. When an ATT is installed in a corrosive s

40、ervice, any parts exposed to the liquid or vapour should be of durable, corrosion-resistant construction to avoid both product contamination and ATT corrosion. All ATTs should be sealed to withstand the vapour pressure of liquid in the tank. ATTs mounted on vessels with an inert gas system (IGS) sho

41、uld be designed to withstand the operating pressure of the IGS. 4.2.2 All marine ATTs should be specified and installed in accordance with the appropriate national and/or International (IMO, IEC, CENELEC, ISGOTT, ISO, etc.) marine electrical safety standards. ATTs should be certified for use in the

42、hazardous-area classification appropriate to their installation. 4.2.3 All external metal parts of ATTs mounted on tanks should be firmly connected to an electrical earth, i.e. the ships hull. 4.2.4 All ATT equipment should be maintained in safe operating condition and the manufacturers maintenance

43、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. 4.3.2 Tank levels should be measured at the same time as the tank temperature is measured. 4.3.3 Temperatur

44、es 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 In the case of multiple port loading and/or discharge, the same general procedures should be used to measure a tank temperat

45、ure before product transfer (opening gauge) and after product transfer (closing gauge). BSISO42665:200224.3.5 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 adj

46、ustment. NOTE 1 This protection may require mounting the ATT sensor(s) in a thermowell. NOTE 2 A TT sensors can be an integral part of the ALG level sensor assembly (e.g. float and tape, pole). Some design (e.g. float and tape) may need the level/temperature sensor assembly to be raised to a “store”

47、 position when it is not being used. Note that such ATTs cannot be used during tank washing. 4.3.6 The design and installation of ATTs 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

48、 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, perfor

49、mance, vibration, humidity, dry heat, inclination, fluctuations in power supplies, insulation, resistance, electromagnetic compatibility 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 level gauging system so that the overall accuracy of the standard volume measurement is not seriously degraded. 5.2 Intrinsic error of