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1、INTERNATIONAL STANDARD ISO 4266-2 First edition 2002-11-15 Reference number ISO 4266-2:2002(E) ISO 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 Ptrole et produits ptroliers liqui
2、des 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 navire Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/99725450
3、01 Not for Resale, 04/20/2007 04:31:43 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4266-2:2002(E) ii ISO 2002 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or vie
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8、ghtiso.ch Web www.iso.ch Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:43 MDTNo reproduction or networking permitted without license from IHS -,-,-
9、 ISO 4266-2:2002(E) ISO 2002 All rights reserved iii Contents Page 1Scope . 1 2Normative references . 1 3Terms and definitions 1 4Precautions . 2 4.1Safety precautions . 2 4.1.1General . 2 4.1.2Equipment precautions . 2 4.2General precautions 3 4.2.1Accuracy and performance . 3 4.2.2Speed of respons
10、e . 3 4.2.3Protection from mechanical damage 3 4.2.4Manual gauging 3 4.2.5Minimum measurable level . 3 4.2.6Trim and list 3 4.2.7Product temperatures . 3 4.2.8Compatibility . 3 4.2.9Entrained air and vapour 4 4.2.10Vessel motion . 4 4.3Use of marine ALGs in fiscal/custody transfer . 4 5Accuracy . 4
11、5.1Intrinsic error of ALGs 4 5.2Calibration prior to installation . 4 5.3Initial shipyard adjustment . 4 5.4Error caused by operating conditions 5 5.5Overall accuracy 5 5.5.1General . 5 5.5.2Use of ALGs for fiscal/custody transfer purposes . 5 6Installation of marine ALGs 5 6.1General 5 6.2Location
12、of ALG . 5 6.3Location of manual calibration check point 5 6.4Gauging of inerted tanks . 5 7Onboard verification of marine ALGs . 6 7.1General precautions 6 7.1.1Check for smooth operation of level-sensing elements at the shipyard . 6 7.1.2ALG technology-specific considerations . 6 7.2Verification b
13、y innage gauging or ullage gauging 6 7.3Initial verification 6 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:43 MDTNo reproduction or networking permitted without license
14、 from IHS -,-,- ISO 4266-2:2002(E) iv ISO 2002 All rights reserved 7.4Subsequent verification . 6 7.4.1General . 6 7.4.2Agreement between ALG reading and manual gauge reading . 6 7.4.3Use of average gauge readings 6 7.4.4Adjustment of the ALG . 7 7.5Verification by alternate methods 7 7.6Schedule fo
15、r regular ALG verification 7 7.7Record keeping 7 8Data communication and receiving 7 8.1Introduction 7 8.2Use of remote readout in fiscal/custody transfer . 7 8.3Telemetry and readout equipment . 8 Annexes AAccuracy limitations of marine level measurement. 9 BAccuracy limitations of marine volume me
16、asurement. 10 Bibliography. 11 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:43 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4266-2:2002(
17、E) ISO 2002 All rights reserved v Foreword 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 int
18、erested 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 ISO, also take part in the work. ISO collaborates closely with the International Electrotechnic
19、al 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 Standards adopted by the technical committees are circulated to the member bodies for voting. Publicat
20、ion 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 subject of patent rights. ISO shall not be held responsible for identifying any or all such pat
21、ent rights. International Standard ISO 4266-2 was prepared by Technical Committee ISO/TC 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 techn
22、ically 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
23、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 pressurized storage tanks (non-refrigerated) Annexes A and B of this part of ISO
24、4266 are for information only. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:43 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4266-2:2002(
25、E) vi ISO 2002 All rights reserved Introduction Marine ALGs are not normally 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 meas
26、urement is available. The use of marine-vessel-based ALGs in fiscal/custody transfer normally requires mutual contractual agreement between the buyer and the seller and may be subject to government regulations. Copyright International Organization for Standardization Provided by IHS under license wi
27、th ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:43 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARDISO 4266-2:2002(E) ISO 2002 All rights reserved 1 Petroleum and liquid petroleum products Measurement of level and
28、 temperature in storage tanks by automatic methods Part 2: Measurement of level in marine vessels 1Scope 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 pet
29、roleum and liquid petroleum products having 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 p
30、art of ISO 4266 is not applicable to the measurement of level in refrigerated cargo tanks. 2Normative 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,
31、 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 the nor
32、mative 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 levels in storage tanks Manual me
33、thods ISO 8697:1999, Crude petroleum and petroleum products Transfer accountability Assessment of on board quantity (OBQ) and quantity remaining on board (ROB) 3Terms 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
34、 automatic level gauge ALG automatic tank gauge ATG 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 Copyright International Organization for Standardization Provided by
35、IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:43 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4266-2:2002(E) 2 ISO 2002 All rights reserved 3.3 innage-based ALGs ALGs designed and installed to measure the l
36、iquid 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 for an ALG 3.5 ullage outa
37、ge 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 4Precautions 4.1Safety precautions 4.1.1General International
38、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 should be followed. 4.1.2Equipme
39、nt precautions 4.1.2.1All 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 should be of durable, corrosion
40、-resistant construction. 4.1.2.2All 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. 4.1.2.3All marine ALGs should be specified and installed in acco
41、rdance 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 maintained in safe operating condi
42、tion and the manufacturers maintenance instructions should be complied with. NOTE 1The 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 the design of the ALG for the p
43、articular 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 2Type-approval tests may include the following: visual inspection, performance, vibra
44、tion, humidity, dry heat, inclination, fluctuations in power supplies, insulation, resistance, electromagnetic compatibility, and high voltage. 4.1.2.4The ALGs should provide security to prevent unauthorized adjustment or tampering. For ALGs to be used in fiscal/custody transfer application, the ALG
45、 should provide facilities to allow sealing of the calibration adjustment. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 04:31:43 MDTNo reproduction or networking permitted wit
46、hout license from IHS -,-,- ISO 4266-2:2002(E) ISO 2002 All rights reserved 3 4.2General precautions 4.2.1Accuracy and performance The general precautions given in 4.2.2 to 4.2.10 affect the accuracy and performance of all types of marine ALGs and should be observed where they are applicable. 4.2.2S
47、peed of response Marine ALGs should have sufficient dynamic response to track the liquid level during maximum tank filling or emptying rates. 4.2.3Protection from mechanical damage Marine ALGs should be designed to withstand damage caused by waves in the tanks due to ship movement. They should also
48、be able to withstand damage from high velocity jets of water or oil used to wash the tanks. NOTE 1This protection may require mounting the ALGs in still-pipes. NOTE 2Alternately, this protection may 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. 4.2.4Manual gauging When an ALG is set or verified by m