BS ISO 4266-1-2002 Petroleum and liquid petroleum products - Measurement of level and temperature in storage tanks by automatic methods - Measurement of level in atmospheric tanks《.pdf

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

2、 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 40917 1 National foreword This British Standard reproduces verbatim ISO 4266-1:2002 and implements it

3、as the UK national standard. Together with BS ISO 4266:2002 Parts 2 to 6, it supersedes BS 7812:1995 which is withdrawn.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 petroleum mea

4、surement, 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 Catalogue under the

5、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 correct applicatio

6、n. 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 informed; monitor

7、 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 18, an inside back cover and a back cover. The BSI copyright date displayed in th

8、is document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD ISO 4266-1 First edition 2002-11-15 Reference number ISO 4266-1:2002(E) Petroleum and liquid petroleum products Measurement of level and temperature in storage ta

9、nks by automatic methods Part 1: Measurement of level in atmospheric tanks Ptrole et produits ptroliers liquides Mesurage du niveau et de la temprature dans les rservoirs de stockage par mthodes automatiques Partie 1: Mesurage du niveau dans les rservoirs pression atmosphriqueBSISO42661:2002 ISO -66

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15、2 Normative references . 1 3 Terms and definitions 1 4 Precautions . 3 4.1 Safety precautions . 3 4.2 Equipment precautions 3 4.3 General precautions 3 5 Accuracy . 4 5.1 Intrinsic error of ALGs 4 5.2 Calibration prior to installation . 4 5.3 Error caused by installation and operating conditions . 4

16、 5.4 Overall accuracy 4 5.4.1 General . 4 5.4.2 Use of ALGs for fiscal /custody transfer purposes 5 6 Installation of ALGs 5 6.1 General 5 6.2 Mounting location 5 6.3 Manufacturers requirements . 5 6.4 Installation . 5 6.5 Still-well design 11 7 Initial setting and initial verification of ALGs in th

17、e field 11 7.1 Introduction 11 7.2 General precautions 12 7.2.1 Initial requirements . 12 7.2.2 Manual reference level measurement procedure . 12 7.2.3 Reference measurement tape and weight certification 12 7.2.4 Effect of weather . 12 7.2.5 ALG technology-specific considerations . 12 7.2.6 Applicat

18、ion-specific considerations . 12 7.3 Initial settings of ALGs . 13 7.3.1 Setting against manual reference ullage measurements 13 7.3.2 Setting against manual reference dip (innage) measurements 13 7.4 Initial verification 14 7.4.1 Introduction . 14 7.4.2 Verification conditions . 15 7.4.3 Initial ve

19、rification procedures 15 7.5 Record keeping . 16 8 Subsequent verification of ALGs 17 8.1 General 17 BSISO42661:2002iiiISO -66242:1)E(200 vi ISO 2002 Ar llithgr seresvde 8.2 Frequency of subsequent verification 17 8.3 Procedure for subsequent verification . 17 8.4 Tolerance for subsequent verificati

20、on 17 9 Data communication and receiving 17 Bibliography. 18 BSISO42661:2002ivOSI -66242002:1)E( ISO 2002 r llAithgs reservde v Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Internat

21、ional 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, governmental and non-governmental, in liaison with I

22、SO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) 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 Standard

23、s 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 vote. Attention is drawn to the possibility that some of the elements of this part of ISO 4266 may be the s

24、ubject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 4266-1 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants, Subcommittee SC 3, Static petroleum measurement. ISO 4266-1, together with ISO

25、 4266-2 to 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 and liquid petroleum products Measurement of level and temperature in storage tanks by automatic methods: Part 1: Measurement of

26、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 of temperature in atmospheric tanks Part 5: Measurement of temperature in marine vessels Part 6: Measurement of temperature in pr

27、essurized storage tanks (non-refrigerated) BSISO42661:2002vANRETNIITOTS LANDNADRA OSI -66242002:1)E( Petroleum and liquid petroleum products Measurement of level and temperature in storage tanks by automatic methods Part 1: Measurement of level in atmospheric tanks 1 Scope This part of ISO 4266 give

28、s guidance on the accuracy, installation, commissioning, calibration and verification of automatic level gauges (ALGs), of both intrusive and non-intrusive types, for measuring the level of petroleum and petroleum products having a Reid vapour pressure less than , stored in atmospheric storage tanks

29、. This part of ISO 4266 is not applicable to the measurement of level in refrigerated storage tanks with ALG equipment. 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 referen

30、ces, subsequent amendments 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,

31、 the latest edition of the 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 4512:2000, Petroleum and liquid petroleum products Equipment for measurement of liquid leve

32、ls in storage tanks Manual methods 3 Terms and definitions For the purposes of this part of ISO 4266, the terms and definitions given in ISO 1988, and the the following, apply. 3.1 anchor weight weight to which the detecting element guide wires of an automatic level gauge are attached to hold them t

33、aut and vertical 3.2 automatic level gauge ALG automatic tank gauge AT G instrument that continuously measures liquid height (dip or ullage) in storage tanks 3.3 dip innage vertical distance between the dipping datum point and the liquid level 100 kPa BSISO42661:20021ISO -66242:1)E(200 2 ISO 2002 Ar

34、 llithgr seresvde 3.4 dipping datum plate dipping datum point dip-plate horizontal metal plate located directly below the gauging reference point to provide a fixed contact surface from which manual liquid-depth measurements are made 3.5 dip-tape graduated steel tape with a tensioning dip-weight use

35、d for measuring the depth of oil or water in a tank, either directly by dipping or indirectly by ullaging 3.6 gauge-hatch gauging access point dip-hatch opening in the top of a tank through which gauging and sampling operations may be carried out 3.7 gauging reference point reference gauge point poi

36、nt clearly defined on the gauge hatch directly above the dipping datum point to indicate the position (and upper datum) from which manual dipping or ullaging should be carried out 3.8 innage-based ALGs ALGs designed and installed to measure the liquid dip, with an integral reference point at or clos

37、e to the tank bottom, referenced to the dipping datum-plate 3.9 intrusive ALG ALG where the level-sensing device intrudes within the tank and makes physical contact with the liquid, e.g. float and servo-operated-type ALGs 3.10 non-intrusive ALG ALG where the level-sensing device may intrude within t

38、he tank, but does not make physical contact with the liquid, e.g. microwave or radar-type ALGs 3.11 still-well stilling-well still-pipe guide pole vertical, perforated pipe built into a tank to reduce measurement errors arising from liquid turbulence, surface flow or agitation of the liquid 3.12 ull

39、age outage distance between the liquid level and the gauging reference point, measured along the vertical measurement axis 3.13 ullage-based ALGs ALGs designed and installed to measure the ullage distance from the upper ALG reference point to the liquid surface BSISO42661:20022OSI -66242002:1)E( ISO

40、 2002 r llAithgs reservde 3 4 Precautions 4.1 Safety precautions International Standards and government regulations on safety and material-compatibility precautions should be followed when using ALG equipment. In addition, the manufacturers recommendations on the use and installation of the equipmen

41、t should be followed. All regulations covering entry into hazardous areas should be observed. 4.2 Equipment precautions 4.2.1 All of the ALG equipment should be capable of withstanding the pressure, temperature, operating and environmental conditions likely to be encountered in service. 4.2.2 ALGs s

42、hould 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 ALG have the same electrical potential as the tank. 4.2.4 All ALG equipment should be maintained in safe operating condition

43、 and the manufacturers maintenance instructions should be complied with. NOTE 1 The design and installation of ALGs may be subject to the approval of a national measurement organization, who will normally have issued a type approval for the design of the ALG for the particular service for which it i

44、s to be employed. Type approval is normally issued after an ALG has been subjected to a specific series of tests and is subject to the ALG being installed in an approved manner. NOTE 2 Type-approval tests may include the following: visual inspection, performance, vibration, humidity, dry heat, incli

45、nation, fluctuations in power supplies, insulation, resistance, electromagnetic compatibility, and high voltage. 4.3 General precautions 4.3.1 The general precautions given in 4.3.2 to 4.3.8 apply to all types of ALGs and should be observed where they are applicable. 4.3.2 Tank temperatures should b

46、e measured at the same time as the tank level is measured. The tank temperature should be representative of the tank contents. 4.3.3 Levels measured for bulk transfer should be recorded promptly when they are taken. 4.3.4 Whenever determinations of the contents of a tank are made before the movement

47、 of a bulk quantity of liquid (opening gauge) and after the movement of a bulk quantity of liquid (closing gauge), the same general procedures should be used to measure the tank level. 4.3.5 All parts of the ALG in contact with the product or its vapour should be chemically compatible with the produ

48、ct, to avoid both product contamination and corrosion of the ALG. 4.3.6 ALGs should have sufficient dynamic response to track the liquid level during maximum tank filling or emptying rates. 4.3.7 Following the transfer of product, the tank should be allowed to settle before the tank level is measure

49、d. 4.3.8 ALGs should provide security to prevent unauthorized adjustment or tampering. ALGs used in fiscal/custody transfer applications should provide facilities to allow sealing for calibration adjustment BSISO42661:20023ISO -66242:1)E(200 4 ISO 2002 Ar llithgr seresvde 5 Accuracy 5.1 Intrinsic error of ALGs The level measurement accuracy of all ALGs is affected by the intrinsic error of the ALG, i.e. the err