How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?().
0pen ullage holes in tanks which are not gas-free must be protected by().
How should cargo tank hatches be protected when the ullage opening is open and the tank not gas free?().
Ullage measurements are taken from the top of the liquid to().
Open ullage holes in tanks which are not gas-free must be protected by().
How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?()