Unit 4 Oil cargoes,oil tanker operations and related pollution- prevention regulations:


Crude oil – Any liquid CH mix occuring naturally in the earth, whether or not render it suitable for transportation.

refined product – Mixture of naturally occurring hydrocarbon that is refined into diesel ,gasoline ,heating oil ,Jet fuel kerosene or literally thousands of other products called petrochemicals.

Spiked crude – crude oil blended with liquefied gas or condensate.

Sour crude – sour crude oil is a crude oil containing a high amount of impurities sulphur . when the total sulphur level in the oil is more than 0.5 % the oil is called sour.

Reid vapour pressure – Reid vapor pressure is a common measure of the volatility of gasoline and other petroleum products. It is defined as the absolute vapor pressure exerted by a liquid at 37.8 °C as determined by the test method ASTM-D-323, which was first developed in 1930 and has been revised several times.

Pour point – The pour point of a liquid is the temperature below which the liquid loses its flow characteristics. In crude oil a high pour point is generally associated with a high paraffin content, typically found in crude deriving from a larger proportion of plant material.

Threshold limit value –Threshold limit value of a chemical substance is believed to be a level to which the worker can be exposed day after day for working lifetime without any adverse effect.

Lower flammable limit- It the concentration of hydrocarbon gas in air below which the mixture becomes too lean to initiate of propagate combustion.

Upper flammable limit – it is the concentration of hydrocarbon gas in air above which the mixture becomes to take ostrich to initiate of propagate combustion.


Read crude oil washing (cow)

Read Loading and discharging Operations on a tanker

Read Procedure for man entry in enclosed space.

Read Slop tank and Handling slops

Read Load on top

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