Question 2 of 30
Fire hydrant valves on a crude oil tanker shall be isolated from the crude oil washing system by
A
A) Spade blanks
B
B) Face blanks
C
C) Non-return valves
D
D) Automatic closing valves
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Answer & Explanation
The correct answer is Option A: A) Spade blanks.
Spade blanks (also known as slip blinds) provide a positive, physical barrier between the fire main and the crude oil washing system. This is a critical safety requirement to prevent hazardous hydrocarbon vapors from entering the fire main.