Before welding can be done in a tank that has carried petroleum products，a certificate must be obtained from ______.A.the customsB.the Register Bureau of shippingC.the shipyard fire departmentD.a certified gas chemist
Before welding can be done in a tank that has carried petroleum products，a certificate must be obtained from ______.
A.the customs
B.the Register Bureau of shipping
C.the shipyard fire department
D.a certified gas chemist
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Before welding in a tank that has carried petroleum products，the tank must be certified by ______.A.the Coast GuardB.the ABSC.the shipyard fire departmentD.a certified marine chemist
The Certificate of Inspection for your tanker authorizes the carriage of grade A and lower products. Which chemical may NOT be carried unless it is specifically endorsed on the Certificate of Inspection?A.AmyleneB.Diisobutyl PhthalateC.Oleic acidD.Vinyl acetate
What refers to the depth of a petroleum product in a tank ________．A.InnageB.OutageC.ThievageD.Ullage
When a non-volatile cargo is carried in a tank that has not been previously gas freed，then that tank shall ______．A.be purged with hydrocarbon gas prior to loadingB.be gas-freed after loading operationsC.not be maintained in an inert conditionD.be maintained in an inert condition
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单选题Petroleum cargo tanks should not be topped off at deck level when loading on a cold day because（）.Aa subsequent temperature rise will cause the cargo to overflowBair pockets may cause the cargo to bubble out of the ullage holeCthe increased viscosity of the product requires higher loading pressure which increases the chances of a spillDthe tank valve may be stiff and a spill will occur before the valve can be closed
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