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Measures For Handling Cargo Oil Having A Flash Point Exceeding 60c

Oil tanker at sea

Handling cargo oil having a flash point exceeding 60c without maintaining cargo oil tanks in inert condition need extreme caution. Confirm that use of IG is not required by regulations at the discharging port and shore facility. Refer to the special precautions as listed out in the latest edition of ISGOTT for above such operations. Also, a formal (stage 2) Risk Assessment will need to be carried out and the office informed, prior to such decision.

Ensure that sufficient reliable evidence available that the flash point of the cargo oil is above 61 degree C and the temperature of the cargo oil does not exceed 5 degree C less than the flash point.

However, when cargoes with a flashpoint exceeding 60 degree C are carried at a cargo temperature higher than their flashpoint less than 5 degree C, the tank should be maintained in an inert condition.

If the previous cargo oil is having a low flash point, purge the inflammable gas by IG until the level of the gas reduced down to 2% by Volume or less beforehand.

If another cargo oil having a low flash point has been loaded into other remaining tanks, prevent the mixing of such vapor by isolating vapor of such grades.

Cargo oil tanks must be inerted prior to washing the tanks with high temperature water.

Take the following measures cargo discharging operations.
Ensure that flame arrestors are fitted in vent posts.
Take preventive measures against static electricity
Refer to relevant Chapter in the latest edition of ISGOTT.

Piping system requirement

All piping systems within cargo tanks, saltwater ballast tanks, double-bottom tanks, pump rooms, pipe tunnel(s) and cofferdams, including void spaces adjacent to cargo tanks, and pipes that pass through the deck or connect to the shell, are examined and tested under working conditions. The surveyor checks for tightness and looks to establish if their condition is satisfactory.

In addition to annual and intermediate survey requirements, all machinery used for liquid cargo services is examined, including ventilation pipes, pressure vacuum valves and flame screens.

The inert gas systems are tested under working conditions. The systemsí main components are examined internally. On the basis of results of these examinations, additional checks can be required, which may include dismantling, hydrostatic tests and/or thickness measures, or all three.

Related articles:

Operation of inert gas system

Oil pollution control method

Gas freeing arrangement for oil tanker

Handling guideline for oil cargo

Oil pollution prevention method

Preparation for loading oil cargo

How to prevent spillage of oil cargo

General precautions for oil cargo loading in tankers

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