Marine Engineering Interview Question:

Why self closing sounding pipes are used onboard?

Submitted by: Lijin

It may possibly regulatory but I definitely know the US Coastguard pick up on it. It is for the fact a tank may be overfilled. A self closing sounding pipe will prevent overflow.
Submitted by: Zimbomike

They are fitted to DB tanks to prevent flooding in case the Hull gets damaged.
Submitted by: Ladislaus Fernandes