Tankerman · Operations — Line Clearing
After completing a transfer, cargo hoses and loading arms are drained/blown down before disconnecting in order to:
- ACool the manifold
- BAvoid spilling the liquid trapped in the line when the connection is broken✓ Correct
- CTest the cargo pump
- DInert the hose
Explanation
Liquid left in a hose or arm will spill when the flange is broken. Draining or blowing the line back to a tank first empties it so the connection can be parted cleanly with containment in place.
Authority: Tank Vessel Operations (33 CFR 156)
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