1、BRITISH STANDARD BS ISO 4266-3:2002 Petroleum and liquid petroleum products Measurement of level and temperature in storage tanks by automatic methods Part 3: Measurement of level in pressurized storage tanks (non-refrigerated) ICS 75.180.30 BS ISO 4266-3:2002 This British Standard, having been prep
2、ared under the direction 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 40919 8 National foreword This British Standard reproduces verbatim ISO 426
3、6-3:2002 and implements it as the UK national standard. Together with BS ISO 4266:2002 Parts 1 and 2 and Parts 4 to 6, it supersedes BS 7812:1995 which is withdrawn.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 Subcommitt
4、ee PTI/12/1, Static and 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
5、 may be found in the 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. Use
6、rs are responsible for 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
7、, and keep the UK interests 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 15 and a back cover. The BSI copyrig
8、ht date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD ISO 4266-3 First edition 2002-11-15 Reference number ISO 4266-3:2002(E) Petroleum and liquid petroleum products Measurement of level and te
9、mperature in storage tanks by automatic methods Part 3: Measurement of level in pressurized storage tanks (non-refrigerated) Ptrole et produits ptroliers liquides Mesurage du niveau et de la temprature dans les rservoirs de stockage par mthodes automatiques Partie 3: Mesurage du niveau dans les rser
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14、m dnaicrfomli, tiwtuoh permini 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 BSISO42663:2002iiContents P
15、age 1 Scope . 1 2 Normative reference . 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
16、 conditions . 4 5.4 Overall accuracy 4 5.4.1 General . 4 5.4.2 Use of ALGs for fiscal/custody transfer applications 5 6 Installation of ALGs 5 6.1 General 5 6.2 Mounting location 5 6.3 Manufacturers requirements . 5 6.4 Installation . 5 6.4.1 Installation of intrusive ullage ALGs (e.g. float-operate
17、d and servo-operated type) mounted on still-wells 5 6.4.2 Installation of intrusive ullage ALGs (e.g. float and servo-operated types) using guide wires 5 6.4.3 Installation of non-intrusive ullage ALGs (e.g. microwave or radar) mounted on still-wells 9 6.4.4 Location of ALG 9 6.4.5 Installation of A
18、LGs other than those described in this part of ISO 4266 . 9 6.5 Still-well design 9 7 Initial setting and initial verification of ALGs in the field 10 7.1 Preparation 10 7.1.1 Check for critical distances . 10 7.1.2 Check for free movement of level-sensing element of intrusive ALGs 10 7.1.3 Check fo
19、r influences of changes in physical and electrical properties of the product (vapour/liquid) . 10 7.2 Initial setting . 10 7.2.1 General . 10 7.2.2 Setting of intrusive ullage ALGs . 11 7.2.3 Setting of non-intrusive ALGs . 11 7.2.4 Other ALGs not described in this part of ISO 4266 12 7.3 Initial fi
20、eld verification 12 7.3.1 Introduction . 12 7.3.2 Verification procedure . 12 BSISO42663:2002iii7.3.3 Tolerance of initial field verification . 13 7.4 Record keeping 13 8 Subsequent verification of ALGs 13 8.1 General 13 8.2 Frequency of subsequent verification 13 8.3 Procedure 13 8.4 Tolerance for
21、subsequent verification of ALGs in fiscal/custody transfer application . 13 8.5 Comparison of the ALG readings from current and previous verifications 14 8.6 Adjustment in subsequent verification . 14 9 Data communication and receiving 14 Bibliography. 15 BSISO42663:2002ivForeword ISO (the Internati
22、onal 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 subject for which a technical committee has been
23、 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) on all matters of electrotechnical standa
24、rdization. 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 International Standard requires approval by at leas
25、t 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. International Standard ISO 4266-3 was prepared by
26、 Technical Committee ISO/TC 28, Petroleum products and lubricants, Subcommittee SC 3, Static petroleum measurement. ISO4266-3, together with ISO4266-1, ISO4266-2 and ISO4266-4 to ISO4266-6, cancels and replaces ISO 4266:1994, which has been technically revised. ISO 4266 consists of the following par
27、ts, 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: Measurement of level in pressurized storage tanks (
28、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) BSISO42663:2002vANRETNIITOTS LANDNADRA OSI -66242002:3)E( Petroleum and liquid petroleum p
29、roducts Measurement of level and temperature in storage tanks by automatic methods Part 3: Measurement of level in pressurized storage tanks (non-refrigerated) 1 Scope This part of ISO 4266 gives guidance on the accuracy, installation, commissioning, calibration and verification of automatic level g
30、auges (ALGs) both intrusive and non-intrusive, for measuring the level of petroleum and petroleum products having a vapour pressure less than , stored in pressurized storage tanks. This part of ISO 4266 gives guidance on the use of ALGs in custody transfer application. This part of ISO 4266 is not a
31、pplicable to the measurement of level in caverns and refrigerated storage tanks with ALG equipment. 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, subsequent amend
32、ments 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 the norma
33、tive 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 the follow
34、ing, apply. 3.1 anchor weight weight to which the detecting element guide wires of an automatic level gauge are attached to hold them taut 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
35、 innage vertical distance between the dipping datum point and the liquid level 4 MPa BSISO42663:200213.4 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 measu
36、rements are made 3.5 dip-tape graduated steel tape with a tensioning dip-weight used 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
37、operations may be carried out 3.7 gauging reference point reference gauge point point 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 a
38、nd installed to measure the liquid dip, with an integral reference point at or close 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
39、ALGs 3.10 non-intrusive ALG ALG where the level-sensing device may intrude within the 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 erro
40、rs arising from liquid turbulence, surface flow or agitation of the liquid 3.12 ullage 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 upp
41、er ALG reference point to the liquid surface BSISO42663:200224 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
42、 and installation of the equipment 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 enc
43、ountered in service. 4.2.2 ALGs should 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 should have the same electrical potential as the tank. 4.2.4 All ALG equipment should b
44、e maintained in safe operating condition and 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 t
45、he 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: visual inspection, performance,
46、vibration, humidity, dry heat, inclination, 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 4.3.9 affect the accuracy and performance of all types of ALGs and should be ob
47、served where they are applicable. 4.3.2 The measurement of tank vapour pressure and temperature, liquid temperature or any other relevant parameter should be time correlated with the tank level measurement. The tank liquid temperature should be representative of the tank contents. 4.3.3 All data mea
48、sured 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 of a bulk quantity of liquid (opening gauge) and after the movement of a bulk quantity of liquid (closing gauge), the same general procedures
49、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 product, 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 leve
