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Old 05-09-2012
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Closing seacocks

We have 20 thru hulls, with seacocks, that I can count off the top of my head. A half dozen or so more for three bilge pumps, underwater lights, etc. When we leave our boat for more than a run ashore, we close nearly all our thru hull seacocks. In particular, we close the raw water intake for the main engine and generator. If they broke, they would most certainly overwhelm the bilge pump in time. We also close all the waterline thru hulls, such as the sink drains as well as the intakes for the heads and other accessories. We can't or don't close 100% of our thru hulls, as we leave the dehumidifier on, which requires that we leave the air conditioning thru hulls open. The washdown pump also stays open, because it is very difficult to get to (not a good reason, but the truth and I worry about it).

When at anchor or the dock for any period of time, I will typically close the main and/or genset thru hulls, if not being used. I will leave the rest open, if we are only going ashore for a number of hours, not days. Otherwise, everything gets shut down.

I recently had an experience where it seems very possible that the yard mechanics ran my engine up without opening the seawater thru hull and killed the impeller. Ironically, they claimed they knew they had to open it, because we are "the only boat in the marina that closes it when we leave".

I found it hard to believe, not to mention being a better argument for why they might forget.

Nevertheless, let's sound off. Do you close your thru hulls when you leave your boat?
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Old 05-09-2012
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Re: Closing seacocks

Quote:
Originally Posted by Minnewaska View Post
Nevertheless, let's sound off. Do you close your thru hulls when you leave your boat?
Nope.
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Old 05-09-2012
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Re: Closing seacocks

When leaving the boat for more than a day we close ALL seacocks except the scupper and bilge pump drains. I agree the engine inlet could overcome the bilge pump very quickly.
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Old 05-09-2012
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Re: Closing seacocks

No.
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Old 05-09-2012
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All except scuppers

But we have only 6 in total.
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Old 05-09-2012
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Re: Closing seacocks

no
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Old 05-09-2012
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Re: Closing seacocks

Both last season and already this season, I've seen nothing but a mast sticking up from a slip in our marina. Attention getting. Although, both were problems immediately after launching.
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Old 05-09-2012
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Re: Closing seacocks

Quote:
Originally Posted by Minnewaska View Post
We have 20 thru hulls, with seacocks, that I can count off the top of my head.

Nevertheless, let's sound off. Do you close your thru hulls when you leave your boat?
Oh. My. God.

My answer:
The engine seacock is shut whenever I leave the boat. I leave the head's seawater intake seacock open in the warmer months and leave it shut all the time during the winter months. The overboard discharge is never opened except to periodically cycle the valve for maintenance.

My cockpit drains, and sink drains are standpipes with no valve. The cockpit drains are above the waterline.

I do admire your "submarine level" of paranoia. Cycling nearly 20 seacocks on a frequent basis sounds like a chore.
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Old 05-09-2012
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Re: Closing seacocks

20 seacocks Minnewaska???!!!!!! No wonder you don't close them all! That's a full-time job!

On my boat I have tried to reduce all holes in the hull and I've got it down to 4: washdown pump intake (always closed except for the few times I've used the pump), head sink outlet (always closed when sailing), galley sink outlet and engine raw water intake. All are easily reached without having to move stuff around. I close all of them when I leave the boat. I also removed any through-hull transducers and paddlewheels (speed) in favour of 2 in-hull fishfinder transducers. Speed (SOG) I get from my GPS, although I miss the speed through the water data I used to have. I feel more comfortable leaving my boat now. Installing a composting toilet and removing 2 through-hulls gave me great peace of mind, especially after reading somewhere that toilets are the number one cause of boat sinkings (siphoning water back into the boat).
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Old 05-09-2012
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20+ ... holy sheet! How is that even possible? LOL

No, I don't close ours, but then I only have three
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