ISO 9403:2000 download

07-02-2021 comment

ISO 9403:2000 download.Crude petroleum – Transfer accountability – Guidelines for cargo inspectIon.
ISO 9403 is intended to encourage uniformity of crude petroleum cargo measurement, accounting and reporting procedures. It is of necessity generalized in recognition of the fact that considerable variation in local conditions exists between seaboard terminals. The guidelines are intended to be imp’emented worldwide and used in agreements that can be clearly interpreted and executed between parties. The recommendations embodied in ISO 9403 are not intended to interfere in any way with business contracts, statutory regulations in force at a particular terminal, with safety considerations, or with relevant environmental practices required by any of the parties involved.
The procedures and practices relate to action by producers, buyers, sellers, shore terminal operators, vessel owners and their crews, customs authorities, independent inspectors, and other parties having an interest in crude petroleum measurements. Since the control of the cargo may pass from shore terminal to vessel, vessel to vessel, and vessel to shore terminal, the determination of quantity and quality at these interfaces is important to the crude petroleum supplier, the vessel operator and the cargo receiver.
ISO 9403 establishes procedures and describes the recommended pracbces for the manual and automatic measurement and accounting of bulk quantities of crude petroleum (Including spIked, blended and reconstituted crude petroleum) transferred from one port to another by marine tank vessels.
ISO 9403 provides a reliable basis for establishing the quantities of crude petroleum transferred. The procedures apply to the transportation of crude petroleum from loading to discharge.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of ISO 9403. For dated references, subsequent amendments to, or revisions of. any of these publications do not apply. However, parties to agreements based on ISO 9403 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. Members of ISO and lEG maintain registers of currently valid International Standards,
ISO 91-1:1992, Petroleum measurement tables — Part 1: Tables based on reference temperatures of 15 C and 60 F.
ISO 2714:1980, Liquid hydrocarbons — Volumetric measurement by displacement meter systems other than dispensing pumps.
ISO 2715:1981. Liquid hydrocarbons — Volumetric measurement by turbine meter systems.
ISO 3170:1988, Petroleum liquids — Manual sampling.
ISO 3171:1988, Petroleum liquids — Automatic pipeline sampling.
150 4267-2:1988, Petroleum and liquid petroleum products — Calculation of oil quantities — Part 2: Dynamic measurement.
ISO 7278-1:1987, Liquid hydrocarbons — Dynamic measurement — Proving systems for volumetric meters — Part 1: General principles.
NOTE 2 The wedge formula should be used only when the liquid does not cover the enhre bottom of the vessers tank.
weight conversion factor
factor for converting volumes to apparent mass-in-air
See 15091-1:1992. table 56.
4 General recommendations
4.1 General responsibilities
4.1.1 It is essential that safe practices be followed.
NOTE In addition to governmental safety regulations, these may Include individual company requirements and those outlined in ICSIOCIMF. International Safety Guide f Oil Tankers and Terminals (ISGOTT).
4.1.2 Each party having facilities or equipment, or supplying equipment used for cargo transfer. measurements, samphng and testing, is responsible for the items being in safe and serviceable condition and if appropriate, with an accuracy traceable to national standards.
4.1.3 Each party involved, including inspectors appointed by the parties, Is responsible within their domain, for ensuring that operations are conducted by persons trained in the use of measurement, sampling and testing equipment and the procedures given in ISO 9403.
4.1.4 Each party involved in sampling/sample handling operations should ensure that the integrity of each sample is maintained, for example, samples are securely closed, properly labelled, not exposed to artificial heat or direct sunlight, and not unduly shaken.
4.1.5 Each party involved in the operation is responsible within their domain for contributing to a reconciliation of vessel and shore quantities, and for seeking explanation for any discrepancies.
4.1.6 Each party should maintain their own complete and accurate records of all relevant data. Such data should be available to all parties.
4.2.3 Ship-tank measurement
If a ship’s tanks are under inert gas pressure, agreement should be sought to allow depressurization to enable manual measurements and sampling.
If the vessel is fitted with a closed ullage system with facilities for the use of portable or permanently installed ullage/temperature and interface equipment whilst the tanks are under pressure, then this procedure can be adopted, provided that the equipment used is accurate and safe. Adequate data should be available in the calibration tables relating to the appropriate corrections to be applied to obtain the true ullage reading. Sampling by this method is limited and may have to be restricted to manifold sampling during operations.
If the vessel tanks are to be kept closed, readings from automatic gauging equipment, it available, should be recorded. When no means are available to make manual measurements or to take samples through pressure-tight gauge-hatch fittings, then it should be recognized that reconciliation between vessel and shore quantities may not be possible.
Temperatures should be taken whilst gauging.
4.3 Reconciliation and records
Discrepancies between shipboard measurements and shore measurements should be recorded, It is essential that every effort should be made to resolve such discrepancies before the vessel departs. Unresolved discrepancies may lead to a letter of protest being issued.
The vessel should maintain cargo records which should be available for inspection by all key persons (see 6.2.1 and 7.2.1).
Vessel documents which relate to cargo quantity and quality assessment should also be available for inspection by all key persons (see 6.2.1 and 7.2.1).
4.4 Independent inspectors
In many cases, the interested parties need an unbiased representative who will verity custody transfer volumes to their mutual satisfaction. Record the total capacity of the terminal loading lines from the vessel’s flange to the shore tank(s).
Ascertain the quantity and quality, and where possible the temperature, of the material in the terminal loading line. The contents of the terminal loading line forms an extension of the loading tanks, and changes in properties can result in a change of quantity which should be accounted for. If neglected, this can contribute to discrepancies. Record the steps taken to determine that the terminal line is full of liquid. The terminal should arrange for loading lines and valves to be set so as to avoid the risk of cargo being contaminated or lost to other lines and tanks, for example, as a result of ballasting operations or from other loading and discharge activities occurring at the same time. It deemed appropriate, the valves can be locked. Tank measurements General
Take opening dips or uUages, temperatures and samples, and measure the depth of free water in each tank to be used for the loading. Obtain the reference height from the calibration tables before taking level measurements and water cuts. Any discrepancy between the observed reference height and the reference height shown on the tank calibration tables should be noted, with an explanation, if possible. Under such circumstances, ullage measurements may be the best alternative. If the tank has recently been in active service, wait for the liquid level to reach equilibrium conditions. If it is impossible to wait, state the reasons for not doing so, and indicate in the remarks section of the inspection report how long the cargo was held in the tank before shipment.
On tanks having floating roofs, gauging should be avoided while the root is in the critical zone. The placement of roof legs on the high or low position should be noted in the inspection report.
stimate and report any material, including water or ice, on the floating root, and the weather conditions under which measurements were taken. Tank levels
All dips or ullages should be recorded. Carry out two measurements, and if they agree to within 3 mm. report the average: otherwise the average of at least three measurements should be reported.
Measure the depth of free water. Whilst determining free-water depth or taking a dip, the observed tank reference height should be noted.

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