Details of the software products used to create this PDF file can be found in the general information relating to the file; The PDF creation parameters were optimized for printing. Publication as an international standard requires the approval of at least 75% of the voting member bodies. Attention is drawn to the possibility that some of the elements of this International Standard may be subject to patent rights.
The recommendations in this International Standard are in no way intended to interfere with business contracts, legal regulations in force at a particular terminal, safety considerations or relevant environmental practices required by any of the parties involved. Because control of the cargo can pass from shore terminal to ship, ship to ship, and ship to shore terminal, determining the quantity and quality at these interfaces is important to the crude oil supplier, the ship operator, and the cargo recipient. This International Standard does not purport to address all safety concerns associated with its use.
It is the responsibility of the user of this International Standard to establish appropriate safety and health practices and to determine applicability or legal limitations prior to use. However, parties to agreements based on this international standard are encouraged to investigate the possibility of using the latest editions of the normative documents listed below.
4 General recommendations 4.1 General responsibilities
- Volume measurement
- Shore-tank measurement
- Metering
- Ship-tank measurement
- Reconciliation and records
- Independent inspectors
- Notices
If there is any doubt about the performance of the instrument, manual procedures should be followed. If a ship's tanks are under inert gas pressure, agreement should be reached to allow depressurization to allow manual measurements and sampling. Sufficient data should be available in the calibration tables regarding the appropriate corrections to be applied to obtain the true ullage reading.
If the vessel tanks are to remain closed, measurements from automatic measuring equipment, if available, shall be recorded. It is essential that every effort is made to resolve such discrepancies before the ship sails. The ship must maintain cargo records which must be available for inspection by all key persons (see 6.2.1 and 7.2.1).
If problems arise at any stage of the transfer that may affect subsequent phases, all key personnel involved must be notified immediately so that necessary and timely action can be taken. Any action not in accordance with the procedures of this International Standard, or refusal to comply with its procedures or existing contractual agreements, must be reported to the key persons.
5 Documentation
Data collection and reporting
8 © ISO 2000 – All rights reserved Independent inspectors will perform or witness all measuring and sampling, verify and report quantities and complete a report detailing all facets of the operation, including a reconciliation of quantity differences. They work together with shore personnel and ship's officers in the performance of the necessary tasks in accordance with this international standard. The role of an independent inspector can vary considerably from case to case in accordance with instructions received from their principals.
It is recommended that reports prepared by independent inspectors should address all matters and calculations included in, but not limited to, this International Standard.
Signing of the forms
6 Procedure at the time of loading 6.1 Measurement, calculation and reporting
- Key meeting
- Shore measurements .1 Terminal loading lines
- Tank measurements .1 General
- Sampling and sample handling .1 Manual samples from loading tanks
- Vessel measurements .1 Valve sealing
- Vessel lines
- Draft, trim, list and gauging locations
- Reference heights
- Remaining ballast
- OBQ measurement
- OBQ volume calculations Determine the OBQ as follows
- OBQ sampling
- Slop tanks
- Bunker survey
- Procedure during loading
- Communications
- Procedure after loading
- Vessel inspection and calculations .1 Draft, trim, list and gauging locations
- Load-port inspection and calculations .1 Terminal loading lines
- Load-port reconciliation
The accuracy of the temperature probe in the shoreline should be verified from calibration/proof records. Each tank to be used in loading must be sampled in accordance with ISO 3170. Manual tank samples prior to loading must be taken to back up any error from the automatic sampling device.
This timing must be consistent with the circumstances, experience and policies of the parties involved in the transfer of custody. A report on the findings must be signed by the ship's representative and, if present, the independent inspector. If a bunker survey is required, the amount of bunker oil on the ship must be measured.
This time should be consistent with the circumstances, experience and policies of the parties involved in the transfer of custody. If possible, reconciliation/comparison of shore and ship numbers should be done before the ship sails.
7 Procedure at the time of discharge 7.1 Measurement, calculation and reporting
Procedure before discharge
- Key meeting
- Terminal discharge lines
- Tank measurements .1 General
- Dynamic quantity measurement .1 Meters and documentation
- Sampling and sample handling
- Vessel inspection and calculations .1 Draft, trim, list and gauging locations
- Vessel's lines
- Vessel ullages/arrival
- Water cut (dip)
- Ballast tanks
- Distribution of vessel samples
- Sea valves
- Bunker survey
- Volume calculations
- In-transit difference
If the difference cannot be reduced to an acceptable level, appropriate notices must be issued. On tanks with floating roofs, measurement should be avoided while the roof is in the critical zone. The placement of roof legs in the high or low position must be recorded in the inspection report.
The cup thermometers should be immersed in the crude oil for a sufficient time to allow them to reach the temperature of the crude oil. The contents of the tank should be as homogeneous as possible and free of sludge and water. Manual samples should be taken from the vessel and host tanks to support a possible failure of the automatic sampling device.
Sufficient samples must be taken to meet the requirements of interested parties and regulatory agencies. Identical samples must be provided to a) the receiving terminal, .. c) all other parties designated to receive them, which may include the ship owner. Samples placed on board the vessel must be properly labeled and sealed and confirmed with a receipt signed by the vessel's representative.
The duration of sample retention should be determined according to the circumstances, experience and policies of the parties involved in the transfer of custody. If a bunker survey is required, the amount of bunker oil on board the vessel should be measured and recorded. Whether or not the vessel will be bunkered during cargo transfer should be recorded together with an indication of the quantity of bunkers expected to be supplied to the vessel.
An estimate should be obtained from the master or chief engineer of the approximate quantity of bunkers to be used during the ship's stay in port. For safety reasons, the unstorage spaces in the vessel's bunker tanks should be tested for hydrocarbon gas using a flammable gas indicator. Gas samples should be taken from each bunker tank vent pipe or through a tank hatch.
Procedure during discharge
- Communications
- Sampling at vessel's manifold
- Check on ballast movement
- Vessel inspection and calculations .1 Draft, trim, list and gauging locations
- Vessel's lines
- ROB determination .1 ROB measurement
- Sea valves
- Bunker survey
- Crude oil washing (COW)
- Shore inspection and calculation .1 Shore lines
- Tank measurement
- Sampling and sample handling
- Dynamic measurement
- Quantity calculations on shore
- Vessel experience factor at discharge terminal
- Discharge-port voyage analysis
- Voyage analysis report
- Quality tests
- Notices
If the flash point of a sample is less than 60 °C, a letter of protest should be sent to the master and the terminal representative should be informed. Material in non-designated compartments should be measured and recorded in the OBQ/ROB report, but should not be included in the totals unless the volumes have changed, intentionally or unintentionally, from those at the port of loading. If the ship's representative signed in protest, it should be noted whether the ship has chosen to have an inspection carried out on his behalf by another company.
If there is a dispute that cannot be resolved between the vessel's personnel and the inspector(s) or other interested party regarding the quantity and nature (liquid or non-liquid) of the ROB, all parties must be notified immediately. concerned and stated in the OBQ/ROB report. The temperature should be measured from the center of the liquid or liquid layer. When determining the depth of free water or diving, the observed reference height of the tank must be taken into account.
ISO 2000 – All rights reserved 25 Tank samples should ideally be analyzed individually, which gives a better insight into the condition of the tank and/or the reliability of the samples. Composition of (tank) samples should be carried out in the laboratory, avoiding high temperatures and loss of light ends. Documentation in accordance with ISO 3171 showing the working range of the instrument in terms of fluid conduction velocities should be available.
Manual samples should be taken after discharge is complete to back up a failure of the automatic sampling device. Each tank that has received cargo should be sampled in sufficient quantity to meet the requirements of the interested parties and regulatory authorities. Identical samples must be delivered to a) the unloading terminal, .. c) all other parties designated to receive them, which may include the vessel owner.
If differences cannot be resolved, appropriate notice must be issued to all interested parties. All relevant data from the port of loading and unloading should be entered into the voyage analysis report form and analyzed to provide an overall overview of the voyage performance. Any action or refusal to act in accordance with this procedure or specific pre-contractual arrangements must be communicated to the relevant personnel and documented by issuing an appropriate notice.
Annex A (informative)
Checklist — Typical information to be reported
Information pertaining to loading
- Figures determined or advised by inspector
- Vessel before loading
- Figures determined by vessel
- Before loading
- Vessel’s loaded figures TCV
- Remarks
TCV ship/shore difference, VEF not applied (volume and %) TCV ship/shore difference, VEF applied (volume and %) A.1.1.4 Shore's loaded figures. Density at 15 °C of cargo loaded Gross apparent mass-in-air Net apparent mass-in-air Gross mass.
Information pertaining to discharge
- Measurements at load terminal
- Bill of lading TCV
- Vessel after loading (sailing figures) TCV
- Measurements at discharge port
- Figures determined or advised by inspector .1 Vessel prior to discharge
- Outturn TCV
- Figures determined by vessel
- Before discharge TCV
- Remarks
OBQ total volume (excluding sewage if no LOT) OBQ free water (excluding waste water if no LOT) Ballast quantities. Amount of liquid decanted during voyage TCV differences between sail/arrival GSV differences between sail/arrival Tank quantities and LEL test COW report. Ship/Shore TCV Difference (Volume and %) GSV Ship/Shore Difference (Volume and %) Tank Quantities and LEL Test.
TCV difference bill of lading/outcome (volume and %) GSV difference bill of lading/disbursement (volume and %) NSV difference bill of lading/disbursement (volume and %) A.2.3 Figures determined by terminal.
Annex B (informative)
VESSEL RATIO AT DISCHARGE PORT
COMPARISON OF LOAD PORT AND DISCHARGE PORT
WALT TANK YES/NO AUTOMATIC SAMPLE YES/NO. ii) top/middle/bottom; bottom; running sample etc. ii) brand and type (iii) assembled on location or in laboratory; composition details.
Manual sampling
Bibliography
