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Old 02-14-2020, 06:29 PM   #3
firehoser75
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City: Nanaimo
Vessel Name: former owner of "Pilitak"
Vessel Model: Nordic Tug 37
Join Date: Feb 2018
Posts: 1,703
Personally, I close my through hulls every time I shut down the engine, just in case. To drastically reduce any problems with "forgetting to open" before running, I place a small card right beside the start key/button that states, "thru hull closed". Between that card being very visible beside the start key and the fact that this is now "habit", I have never had an issue with this.

I also have a water flow alarm installed in the raw water line between the strainer and the pump that should alarm instantly if the thru hull were left closed.
To me, this (set up and procedure) makes great sense. It almost eliminates the possibility of leaks such as could have happened to you if the thru hull had been left open, and it exercises the thru hull regularly so it will not get stuck in one position.
Mind you, I have easy access to the thru hull, so that makes it easy.
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Tom
Nanaimo, BC
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