Both the shore figures & the ship figs will be subject to the effects of random errors and systematic errors so they are unlikely to agree exactly. (ASTM Tables 54 A, B, C, D or 6 A, B)Īt the end of a ship loading or discharge operation, it is customary to compare the quantity loaded or discharged measured on shore with the quantity measured on board the ship. ![]() The Volume Correction Factor (VCF) is the factor depending on the oil type, density or its equivalent and temperature which corrects oil volumes to the Standard Reference Temperature (s).Total Calculated Volume (TCV) is the gross standard volume plus the free water measured at the temperature & pressure prevailing.Net Standard Volume (NSV) is the volume of oil excluding total water and total sediment, calculated at standard conditions e.g 15 oC or 60 oF and 1013.25 hPa.Net Observed Volume (NOV) is the volume of oil excluding total water and total sediment at the oil temperature & pressure prevailing.Gross Standard Volume (GSV) is the volume of oil including dissolved water, suspended water and suspended sediment but excluding free water and bottom sediment, calculated at standard condition e.g 15 oC or 60 oF and 1013.25 hPa.Gross Observed Volume (GOV) is the volume of oil including dissolved water, suspended water and suspended sediment but excluding free water and bottom sediment, measured at the oil temperature and pressure prevailing.Total Observed Volume (TOV) is the volume of oil including total water and total sediment measured at the oil temperature and pressure prevailing.Total water is the sum of all the dissolved, suspended and free water in a cargo or parcel of oil. Free water is the water that exists in a separate layer, Note: It may over a period of time either collect as free water or become dissolved water depending on the conditions of the temperature and pressure prevailing. Suspended water is the water within the oil which is finely dispersed as small droplets Waterĭissolved water: is the water contained within the oil forming a solution at the prevailing temperature. Total sediment is the sum of suspended and the bottom sediment. Bottom sediment are non-hydrocarbon solids present in a tank as a separate layer at the bottom. Suspended sediment are non-hydrocarbon solids present in the oil but not in solution. Quantity Remaining On Board (ROB) : All the measurable oil, water, sludge and sediment in the cargo tanks and associated lines & pumps on a ship after discharging a cargo has been completed, excluding vapour.On Board Quantity (OBQ) : All the oil, water, sludge and sediment in the cargo tanks and associated lines and pumps on a ship before loading commences.GLOSSARY OF TERMS AND UNITS OF MEASUREMENT Quantities It should be noted that most crude oils are traded in Barrels. However, confusion may arise in the latter case if the reference temperature is not stated (Bill of Lading and or Certificate of Quantity and or shore Quantity Calculations Certificate). It is customary to refer to volumes at the reference temperature as Standard Volumes e.g US barrels 60 oF or cubic meters 15 oC. In non-metric countries the barrel (Bbl).Ĭombining a statement of volume with a statement of the reference temperature yields the following measurement systems.In metric countries the cubic meter (m ).The situation is further confused in that there are primarily two volumetric units, which are: Generally, the reference temperatures are: Unfortunately, different countries have different standard (reference) temperatures. ANNEX III – Technical Details of Sound Signal AppliancesĪn oil volume can only be measured at its prevailing temperature and it, therefore, follows that the standard volume must usually be calculated. ![]() ANNEX II – Additional Signals for Fishing Vessels Fishing in Close Proximity.Annex 1 – Positioning and technical details of lights and shapes.Part F – Verification of compliance with the provisions of the Convention.Rule 35 – Sound signals in restricted visibility.Rule 34 – Manoeuvring and warning signals. ![]() Rule 30 – Anchored vessels and vessels aground.Rule 28 – Vessels constrained by their draught.Rule 25 – Sailing vessels underway and vessels under oars.Rule 23 – Power-driven vessels underway.Rule 19 – Conduct of vessels in restricted visibility.Rule 18 – Responsibilities between vessels.
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