5.1 Regulations covering inert gas systems require
that instrumentation shall be fitted for continuously indicating and
permanently recording the pressure and oxygen content of the gas in
the inert gas supply main at all times when inert gas is being supplied.
The permanent recorder should indicate if the system has been operating
in a satisfactory manner before and during the cargo discharge.
5.2 If conditions specified in the Operations
and Equipment Manual are not being met the washing must be stopped
until satisfactory conditions are restored.
5.3 As a further precautionary measure, the oxygen
level in each tank to be washed is to be determined at the tank. The
meters used should be calibrated and inspected to ensure that they
are in good working order. Readings from tanks already washed in port
prior to inspection should be available for checking. Spot checks
on readings may be instituted.