Originally Posted by
Captain Kong
It was a stupid system,
Go down a gas filled tank digging out sludge which releases more gas, climb up a 50 foot ladder wobbly and dazed, then the Mate gives you a large tot of rum then go down again. ,only another 27 tanks to do,
Today on VLCCs there is a branch line from the main discharge line. that leads into the Butterworth machine. that rotates at a high angle and slowly as the tank level of the crude goes down the angle changes, it blasts all the tank side removing the crude and scales of rust. all th way down to the bottom and all the tank bottom is blasted with the outgoing crude, leaving the tank all nice and clean.
At the same time the Tank is full of inert gas, so no risk of explosion. All the sludge and scales are discharged with the cargo.
Brian.