1、BRITISH STANDARD BS ISO 4266-2:2002 Petroleum and liquid petroleum products Measurement of level and temperature in storage tanks by automatic methods Part 2: Measurement of level in marine vessels ICS 75.180.30 BS ISO 4266-2:2002 This British Standard, having been prepared under the direction of th
2、e 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 40918 X National foreword This British Standard reproduces verbatim ISO 4266-2:2002 and implements it as
3、the UK national standard. Together with BS ISO 4266:2002 Part 1 and Parts 3 to 6, it supersedes BS 7812:1995 which is withdrawn.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 petro
4、leum 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 Catalogue un
5、der 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 correct ap
6、plication. 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;
7、 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 vi, pages 1 to 11 and a back cover. The BSI copyright date displayed in this document indicates when
8、the document was last issued. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD ISO 4266-2 First edition 2002-11-15 Reference number ISO 4266-2:2002(E) Petroleum and liquid petroleum products Measurement of level and temperature in storage tanks by automatic methods Pa
9、rt 2: Measurement of level in marine vessels Ptrole et produits ptroliers liquides Mesurage du niveau et de la temprature dans les rservoirs de stockage par des mthodes automatiques Partie 2: Mesurage du niveau dans les citernes de navireBSISO42662:2002 ISO -66242:2)E(200 ii ISO 2002 Ar llithgr sere
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14、c 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 BSISO42662:2002iiContents Page 1 Scope . 1 2 Normative references . 1 3 Terms and definitions 1 4 Precautions . 2 4.1 Safety precautio
15、ns . 2 4.1.1 General . 2 4.1.2 Equipment precautions . 2 4.2 General precautions 3 4.2.1 Accuracy and performance . 3 4.2.2 Speed of response . 3 4.2.3 Protection from mechanical damage 3 4.2.4 Manual gauging 3 4.2.5 Minimum measurable level . 3 4.2.6 Trim and list 3 4.2.7 Product temperatures . 3 4
16、.2.8 Compatibility . 3 4.2.9 Entrained air and vapour 4 4.2.10 Vessel motion . 4 4.3 Use of marine ALGs in fiscal/custody transfer . 4 5 Accuracy . 4 5.1 Intrinsic error of ALGs 4 5.2 Calibration prior to installation . 4 5.3 Initial shipyard adjustment . 4 5.4 Error caused by operating conditions 5
17、 5.5 Overall accuracy 5 5.5.1 General . 5 5.5.2 Use of ALGs for fiscal/custody transfer purposes . 5 6 Installation of marine ALGs 5 6.1 General 5 6.2 Location of ALG . 5 6.3 Location of manual calibration check point 5 6.4 Gauging of inerted tanks . 5 7 Onboard verification of marine ALGs . 6 7.1 G
18、eneral precautions 6 7.1.1 Check for smooth operation of level-sensing elements at the shipyard . 6 7.1.2 ALG technology-specific considerations . 6 7.2 Verification by innage gauging or ullage gauging 6 7.3 Initial verification 6 BSISO42662:2002iii7.4 Subsequent verification . 6 7.4.1 General . 6 7
19、.4.2 Agreement between ALG reading and manual gauge reading . 6 7.4.3 Use of average gauge readings 6 7.4.4 Adjustment of the ALG . 7 7.5 Verification by alternate methods 7 7.6 Schedule for regular ALG verification 7 7.7 Record keeping 7 8 Data communication and receiving 7 8.1 Introduction 7 8.2 U
20、se of remote readout in fiscal/custody transfer . 7 8.3 Telemetry and readout equipment . 8 Annexes A Accuracy limitations of marine level measurement . 9 B Accuracy limitations of marine volume measurement. 10 Bibliography. 11 BSISO42662:2002ivForeword ISO (the International Organization for Standa
21、rdization) 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 t
22、o 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. International Sta
23、ndards 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 member bodies
24、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 4266-2 was prepared by Technical Committee ISO/TC
25、28, Petroleum products and lubricants, Subcommittee SC 3, Static petroleum measurement. ISO 4266-2, together with ISO 4266-1 and ISO 4266-3 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 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) Annexes A and B of this part of ISO 4266 are for information only. BSISO42662:2002vIntroduction Marine ALGs are not normally
28、used in fiscal/custody transfer applications because of the limitations described in annexes A and B. However, level measurement by marine ALGs may be used in fiscal/custody transfer when no other alternative, reliable measurement is available. The use of marine-vessel-based ALGs in fiscal/custody t
29、ransfer normally requires mutual contractual agreement between the buyer and the seller and may be subject to government regulations. BSISO42662:2002viANRETNIITOTS LANDNADRA OSI -66242002:2)E( Petroleum and liquid petroleum products Measurement of level and temperature in storage tanks by automatic
30、methods Part 2: Measurement of level in marine vessels 1 Scope This part of ISO 4266 gives guidance on the accuracy, installation, calibration and verification of automatic level gauges (ALGs), both intrusive and non-intrusive, for measuring the level of petroleum and liquid petroleum products havin
31、g a Reid vapour pressure less than , transported aboard marine vessels (i.e. tankers and barges). This part of ISO 4266 gives guidance for buyers and sellers who mutually agree to use marine ALGs for either fiscal and/or custody transfer applications. This part of ISO 4266 is not applicable to the m
32、easurement of level in refrigerated cargo 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 amendments to, or revisions of, any of these publicatio
33、ns 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 the normative document referred to applies. Memb
34、ers 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 levels in storage tanks Manual methods ISO 8697:1999, Crude petroleum and
35、petroleum products Transfer accountability Assessment of on board quantity (OBQ) and quantity remaining on board (ROB) 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 automatic level gauge ALG automatic tan
36、k gauge AT G instrument that continuously measures liquid height (dip or ullage) in storage tanks 3.2 dip innage vertical distance between the dipping datum point and the liquid level 100 kPa BSISO42662:20021ISO -66242:2)E(200 2 ISO 2002 Ar llithgr seresvde 3.3 innage-based ALGs ALGs designed and in
37、stalled to measure the liquid dip directly 3.4 still-pipe vertical, perforated pipe built into a tank to contain the liquid-level-detecting element in order to reduce measurement errors arising from liquid turbulence, surface flow or agitation of the liquid, and to provide a stable mounting point fo
38、r an ALG 3.5 ullage outage distance between the liquid level and the upper reference point, measured along the vertical measurement axis 3.6 ullage-based ALGs ALGs designed and installed to measure the distance from the ALG reference point to the liquid surface 4 Precautions 4.1 Safety precautions 4
39、.1.1 General International Standards and government regulations, classification societies and ISGOTT on safety and material- compatibility precautions should be followed when using marine ALG equipment. In addition, the manufacturers recommendations on the use and installation of the equipment shoul
40、d be followed. 4.1.2 Equipment precautions 4.1.2.1 All marine ALGs should be capable of withstanding the pressure, temperature and other environmental conditions likely to be encountered in marine service. When an ALG is installed in a corrosive service, any parts exposed to the liquid or vapours sh
41、ould be of durable, corrosion-resistant construction. 4.1.2.2 All ALGs should be sealed to withstand the vapour pressure of liquid in the tank. ALGs mounted on vessels with an inert gas system (IGS) should be designed to withstand the operating pressure of the IGS. 4.1.2.3 All marine ALGs should be
42、specified and installed in accordance with the appropriate national and/or international (IMO, IEC, CENELEC, ISGOTT, ISO, etc.) marine electrical safety standards. ALGs should be certified for use in the hazardous-area classification appropriate to their installation. All ALG equipment should be mai
43、ntained in safe operating condition and the manufacturers maintenance instructions should be complied with. NOTE 1 The design and installation of ALGs may be subject to the approval of the national measurement organization and classification societies, who may have issued a general type approval for
44、 the design of the ALG for the particular service for which it is 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: visu
45、al inspection, performance, vibration, humidity, dry heat, inclination, fluctuations in power supplies, insulation, resistance, electromagnetic compatibility, and high voltage. 4.1.2.4 The ALGs should provide security to prevent unauthorized adjustment or tampering. For ALGs to be used in fiscal/cus
46、tody transfer application, the ALG should provide facilities to allow sealing of the calibration adjustment. BSISO42662:20022OSI -66242002:2)E( ISO 2002 r llAithgs reservde 3 4.2 General precautions 4.2.1 Accuracy and performance The general precautions given in 4.2.2 to 4.2.10 affect the accuracy a
47、nd performance of all types of marine ALGs and should be observed where they are applicable. 4.2.2 Speed of response Marine ALGs should have sufficient dynamic response to track the liquid level during maximum tank filling or emptying rates. 4.2.3 Protection from mechanical damage Marine ALGs should
48、 be designed to withstand damage caused by waves in the tanks due to ship movement. They should also be able to withstand damage from high velocity jets of water or oil used to wash the tanks. NOTE 1 This protection may require mounting the ALGs in still-pipes. NOTE 2 Alternately, this protection ma
49、y require that the ALGs with a float or displacer-type level-sensing element be raised to a “store” position when it is not being used. Note that such ALGs cannot be used during tank washing. 4.2.4 Manual gauging When an ALG is set or verified by manual gauging, the manual gauging should be performed to obtain the highest accuracy (see ISO 4512). 4.2.5 Minimum measurable level The ALG should be able to measure levels as near
