1、BRITISH STANDARD BS ISO 4512:2000 Petroleum and liquid petroleum products Equipment for measurement of liquid levels in storage tanks Manual methods ICS 75.180.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 4512:2000 This British Standard, having been prepared under
2、the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 May 2001 BSI 05-2001 ISBN 0 580 37235 9 National foreword This British Standard reproduces verbatim ISO 4512:2000 and implements it as the UK na
3、tional standard. 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 measurement, which has the responsibility to: A list of organizations represented on this subcommittee can be obtaine
4、d 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 Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the
5、BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid e
6、nquirers 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 related international and European developments and promulgate them in the UK. Summary of pages This
7、document comprises a front cover, an inside front cover, the ISO title page, pages ii to vi, pages 1 to 26, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments
8、Reference number ISO 4512:2000(E) INTERNATIONAL STANDARD ISO 4512 First edition 2000-12-15 Petroleum and liquid petroleum products Equipment for measurement of liquid levels in storage tanks Manual methods Ptrole et produits ptroliers liquides Appareils de mesure du niveau des liquides dans les rser
9、voirs Mthodes manuellesISO 4512:2000(E) ii ISO 4512:2000(E)iii Contents Page Forewordv Introductionvi 1 Scope 1 2 Normative references 1 3 Terms and definitions .1 4 General4 5 Dip-tapes.4 5.1 General4 5.2 Construction.4 5.3 Material .4 5.4 Coating6 5.5 Attachment .6 5.6 Dimensions.6 5.7 Graduation7
10、 5.8 Zero datum .7 5.9 Accuracy (maximum permissible error, m.p.e.) .7 5.10 Marking .8 6 Winding frames8 7 Dip-weights.9 7.1 General9 7.2 Material .9 7.3 Construction.9 7.4 Mass9 7.5 Accuracy of graduation.11 7.6 Zero marking 11 7.7 Scale marks11 7.8 Marking .11 8 Ullage-rules 11 8.1 General11 8.2 M
11、aterial .11 8.3 Construction.11 8.4 Mass13 8.5 Accuracy of graduation.13 8.6 Zero mark13 8.7 Scale marks13 8.8 Figuring.13 8.9 Marking .13 9 Water-finding rules 13 9.1 General13 9.2 Material .15 9.3 Construction.15 9.4 Accuracy of graduation.15 9.5 Scale marks15 9.6 Marking .15 10 Interface-detectin
12、g pastes 15 10.1 General15 10.2 Ullage pastes16 10.3 Water-finding pastes .16ISO 4512:2000(E) iv 11 Portable electronic gauging devices (PEGDs)16 11.1 General16 11.2 Safety 16 11.3 Measuring tape construction, graduation and marking 16 11.4 Sensor probe/housing.16 11.5 Zero datum17 11.6 Accuracy of
13、measurement17 11.7 PEGD reading index 17 11.8 Electrical continuity.18 11.9 Marking .18 12 Vapour-lock valve 18 13 Dip-rods (or sticks) and ullage-rods (or sticks)20 13.1 General20 13.2 Material20 13.3 Construction and dimensions 20 13.4 Graduation20 13.5 Zero datum marking 24 13.6 Accuracy.24 13.7
14、Marking .25 Bibliography 26ISO 4512:2000(E)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 memb
15、er 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 ISO, also take part in the work. ISO collaborates closely with the International Ele
16、ctrotechnical 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 votin
17、g. 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 International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying an
18、y or all such patent rights. International Standard ISO 4512 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants, Subcommittee SC 3, Static petroleum measurement.ISO 4512:2000(E) vi Introduction This International Standard describes the equipment required to measure the
19、level of petroleum and petroleum products contained in a tank or container. Calculation of the quantity of petroleum and petroleum products contained in a tank or container also requires that the temperature of the liquid and its density are determined. The equipment required and the methods of dete
20、rmination of temperature and density are described in other International Standards to which reference should be made.INTERNATIONAL STANDARD ISO 4512:2000(E)1 Petroleum and liquid petroleum products Equipment for measurement of liquid levels in storage tanks Manual methods 1 Scope This International
21、 Standard specifies the requirements for the equipment required to measure manually the liquid level or the corresponding volume of petroleum and petroleum products stored in tanks and containers. 2 Normative references The following normative documents contain provisions which, through reference in
22、 this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the
23、 most recent editions of the normative documents indicated below. For undated references, 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. IEC
24、60079-11:1991, Electrical apparatus for explosive gas atmospheres Part 11: Intrinsic safety “i”. 3 Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 1998 and the following apply. 3.1 calibration table tank table tank capacity table table sh
25、owing the capacities of, or volumes in, a tank corresponding to various liquid levels measured from the specified dipping datum-plate and/or gauging reference point 3.2 dip innage depth of liquid in a tank above the dipping datum-plate 3.3 dip-rod dip-stick rigid length of wood or other material, gr
26、aduated in units of volume or length, for measuring by dip the quantity of liquid in small tanks which have been calibrated in terms of dip 3.4 dip-tape graduated steel tape used for measuring the level of oil or water in a tank, either directly by dipping or indirectly by ullagingISO 4512:2000(E) 2
27、 3.5 dip-weight weight attached to a steel dipping-tape, of sufficient mass to keep the tape taut and of a shape to facilitate the penetration of any sludge that may be present on the datum-plate 3.6 dipping datum-point point at the bottom of a tank which the dip-weight touches during dipping, and f
28、rom which the measurements of the oil and water depths are taken NOTE The dipping datum-point usually corresponds with the datum-plate but, when this is not so, the difference in level between the datum-plate and the datum-point should be allowed for in the calibration table. 3.7 free water water, p
29、resent in a tank, which is not in solution or suspension within the oil and which exists as a separate layer within the tank 3.8 gauge-hatch opening at the top of a tank through which dipping, ullaging and/or sampling operations are carried out NOTE When gauging operations are carried out under clos
30、ed or restricted conditions (via a vapour lock valve), the term “gauging access point” may be used. 3.9 gauging process of taking all the necessary measurements in a tank in order to determine the quantity of liquid which it contains NOTE For the purposes of this International Standard, gauging refe
31、rs to level measurements only. 3.10 gauging reference point reference gauge point upper datum upper reference point point clearly marked on the gauge-hatch, vapour lock valve or on a plate suitably located above or below the gauge-hatch, to indicate the position (and upper datum) from which the meas
32、urements of dip or ullage are made 3.11 identification marks marks on a dip-tape that record the temperature and tension at which the tape was calibrated NOTE Other marks may include the total length of the tape and/or its conformance with this International Standard. 3.12 master dip-tape dip-tape a
33、nd weight combination of known accuracy, which is calibrated by an accredited laboratory and is traceable to national standards of length 3.13 portable electronic gauging device PEGD portable instrument employing electronic or electrical sensor(s) for the measurement of liquid level, temperature and
34、/or water interface NOTE Other optional measurements such as density may also be provided.ISO 4512:2000(E)3 3.14 pressure tank storage tank designed to operate at pressures above atmospheric NOTE For convenience, this type of tank is divided into two general classes: low-pressure tanks, used for vol
35、atile products which are liquid at ambient temperatures; high-pressure tanks, used for liquids which are normally in the vapour phase at ambient temperature and pressure. 3.15 ullage paste product-finding paste gasoline-finding paste paste used to facilitate reading the liquid level on the scale of
36、a dip-tape, dip-rod, ullage-rule or ullage-rod, when gauging products which do not give a clear cut on the gauging device 3.16 reference height reference gauge height height of the gauging reference point above the dipping datum-point 3.17 ullage outage working capacity of a tank not occupied by the
37、 liquid 3.18 ullage hatch ullage port ullage plug manual gauge-hatch usually fitted with a heavy-duty cover 3.19 ullage-rod ullage-stick rigid length of wood or other material, usually graduated in units of volume, for measuring by ullage the quantity of liquid in small tanks which have been calibra
38、ted in terms of ullage 3.20 ullage-rule graduated rule attached to a dip-tape to facilitate the measurement of ullage where it would not be practical to obtain a tape cut, for example when gauging viscous, waxy or heated oils 3.21 vapour lock valve device fitted to the top of vapour-tight or pressur
39、e tanks to permit manual measurement and/or sampling operations to be carried out without loss of pressure 3.22 vapour-tight tank tank intended primarily for the storage of volatile liquids, for example gasoline, and so constructed that it will withstand pressures slightly above atmospheric pressure
40、 3.23 water bottom water dip depth of any free water at the bottom of a tankISO 4512:2000(E) 4 3.24 water-finding paste paste containing a chemical which changes colour on contact with water NOTE The paste, when applied to a water-finding rule, indicates the level of any free water in a tank. 3.25 w
41、ater-finding rule graduated rule attached to a dipping tape which is used in conjunction with water-finding paste to measure the depth of any free water in a tank 4 General 4.1 If a certificate of calibration is required for any of the equipment, such as dip-tapes, dip-weights or ullage- rules, this
42、 shall be obtained from a competent authority and shall be traceable to national or international standards with a 95 % confidence limits uncertainty, which is within the maximum permissible error requirements specified in this International Standard (5.9). 4.2 Equipment which has been subjected to
43、repair shall not be used for reference purposes, but may be used for other purposes if it has been verified by a competent authority and found to comply with the requirements of this International Standard. 5 Dip-tapes 5.1 General 5.1.1 Dip-tapes shall be used in conjunction with a standard dip-weig
44、ht or ullage-rule or water-finding rule described in clauses 7, 8 and 9 (see Figure 1). They shall be wound onto a drum contained within a frame equipped with a handle (see Figure 2). It is strongly recommended that dip-weights, ullage-rules and water-finding rules are detached from the dip-tape whe
45、n either carried or stored to avoid constant flexing of the dip-tape at the point of attachment, leading to breakage of the dip-tape. 5.1.2 The dip-tape, hanging device (see 5.5) and dip-weight shall be so constructed that the zero of the system is at the lower face of the dip-weight; i.e. the dip-t
46、ape, hanging device and dip-weight form one continuous system. Graduations shall be continuous throughout the length of the tape. NOTE In some countries, local metrological regulations may require that the graduations are also continuous throughout the tape/weight combination. 5.2 Construction Dip-t
47、apes shall be constructed from one continuous length of steel. 5.3 Material The steel from which the tape is manufactured shall have the following specification (or shall be a steel of similar specification): a) high carbon content (mass fraction of carbon of approximately 0,8 %); b) tensile strengt
48、h of between 1 600 N/mm 2 and 1 850 N/mm 2 ; c) coefficient of linear expansion of (11 1) 10 6 C 1 . For gauging certain petrochemical products, alternative material such as stainless steel may be specified. In this case, a length-correction table according to temperature may be required.ISO 4512:20
49、00(E)5 Dimension in millimetres Figure 1 Examples of dip-tapes with different dip-weightsISO 4512:2000(E) 6 NOTE This figure is an example, other types of winding frames are acceptable. Figure 2 Typical winding-frame 5.4 Coating Dip-tapes shall be supplied coated with a suitable anticorrosion material for protection in storage. Such coatings shall not electrically insulate the dip-tape. 5.5 Attachment A hanging device such as a rotule or swivel hook shall be permanently secured (e.g. rivetted) to the leading end of the tape for the attachment of a
