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Old 17-10-2018, 19:21   #46
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Re: Thru hull counts

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L don’t worry, our boat is well-maintained, never had a hose clamp failure.
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Our boats have at least twenty thruhulls, nerver been a problem. Yes we’ve sprung a leak a few times when a hose clamp let loose, never a problem to locate and repair.
One of these is not like the other...
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Old 17-10-2018, 19:31   #47
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Re: Thru hull counts

Can't see how there's a debate. Obviously one through hull is more likely fail than none. Two more likely than one....
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Old 17-10-2018, 19:41   #48
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Re: Thru hull counts

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By limiting your thru hulls, most people actually just have a false sense of security, since most water leak problems actually occur via internal hoses and appliances. We’ve never had a thru hull or valve let go, just internal seals such as a hose leak on a new generator, which can just as easily happen on a boat with only one or two thru hulls.


So the fact I have no thruhulls gives me a false sense of security that my nonexistent thruhulls wont leak?🤣🤣🤣🤣
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Old 17-10-2018, 20:30   #49
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Re: Thru hull counts

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Can't see how there's a debate. Obviously one through hull is more likely fail than none. Two more likely than one....
And 2 or 4 less likely than 24 or more
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Old 17-10-2018, 20:56   #50
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Re: Thru hull counts

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And 2 or 4 less likely than 24 or more
I guess at some point there's more through than hull....
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Old 17-10-2018, 21:48   #51
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Re: Thru hull counts

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Some boats also have .....a common "box" (can't recall the name for it at the moment)
That "box" is called a "seachest".
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Old 17-10-2018, 21:51   #52
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Re: Thru hull counts

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One of these is not like the other...
That’s because you don’t understand what happened or what could happen, you have a false sense of security.

Like I wrote, please stop worrying about others people's boats. The hose clamps that let loose had nothing to do with thru hull fittings. One was on a brand new generator hose (part of the engine, not the plumbing) and another was on the internal parts of the watermaker. The same thing could happen on a boat with one or two thru hull fittings leading to a manifold... it has nothing to do with the total number of thru hulls. Even if you only had one thru hull fitting leading to all appliances on your boat, that doesn’t prevent one of your appliances from springing an internal leak from a hose or clamp.

Now, I guess you can start worrying about that possibility too.
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Old 18-10-2018, 00:17   #53
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Re: Thru hull counts

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That "box" is called a "seachest".
Got it, thanks.
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Old 18-10-2018, 03:15   #54
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Re: Thru hull counts

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By limiting your thru hulls, most people actually just have a false sense of security, since most water leak problems actually occur via internal hoses and appliances. We’ve never had a thru hull or valve let go, just internal seals such as a hose leak on a new generator, which can just as easily happen on a boat with only one or two thru hulls.
Good point. But with just a few through hulls it's easy to close them all every time you leave the boat so you don't have to worry about hoses leaking. In my case, I close all my through hulls every time I leave the boat (except the cockpit scuppers). It takes me less than a minute.
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Old 18-10-2018, 11:29   #55
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Re: Thru hull counts

The total risk is the product of the extent of the exposure and the probability of failure. Limiting either reduces the risk.
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Old 21-10-2018, 01:08   #56
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Re: Thru hull counts

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The total risk is the product of the extent of the exposure and the probability of failure. Limiting either reduces the risk.
Better yet, limit both! Fewer holes and fussy maintenance.
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Old 21-10-2018, 02:46   #57
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Re: Thru hull counts

Two new hulls fitted,
One thru hull for the motor, Discharges above the water line,
Water maker, One thru hull, Discharges above the water line, Into the cockpit,
Head, Two thru hulls, One in, One out,
Depth sounder, One thru hull,
Speed wheel will be replaced with an external stern unit, Or just use the GPS for my speed, That has removed one Thru Hull,

Centre Boards, 1/2 inch thru hull holes x 4, fully sealed with 5200, Attached to the centre board box, These cant leak as the bolts are squeezing the sealing plates to the box,

Sinks, Shower, Bilge pumps, Cockpit drains, All discharge above the water line, Under the bridge deck and cant be seen,

Wow, I have 9 of them, But four are permanently sealed, So that leaves 5 thru hulls That could fail,
But all are easily accessable by lifting a floor panel or the cover behind the head,
I keep tapered wooden plugs of the right size beside them all, In plastic bags,

Cheers, Brian,
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Old 21-10-2018, 03:57   #58
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Re: Thru hull counts

Don’t want to hyjack the argument about through hulls but I have a couple of experiences with them in my short sailing experiences.

Just come back from TX after looking at a 33’ boat with ten underwater through hulls all seized, the surveyor said “don’t try too hard with seacocks when your in the water” so I didn’t. But some of the larger ones had spinning levers so were clearly useless. I have no idea what some of them were for. Two above water bilge pump outlets were corroded and the hoses were lying inside the boat! Very nice water circulator system had the pumps been turned on. There was also water up to the sole.

And I did have a charter boat in the BVI that had the wet exhaust hose clamp fail (perforated type) which led to a few hours of ‘intense excitement’ and a couple of ruined days. If my wife had been with then it would have been a ruined week.

OK Carry on the argument...
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Old 21-10-2018, 04:23   #59
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Re: Thru hull counts

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Can't see how there's a debate. Obviously one through hull is more likely fail than none. Two more likely than one....
Is a sea chest significantly better?

Let's say you have 6 thru hulls or a sea chest with one large inlet hose and 6 smaller hoses feeding individual systems (7 hose connections at the seachest) and those hoses are longer with more chance for chafe.

If you religiously, close the main seacock every time you leave the boat, maybe it's better but most people I know don't close all their seacocks on a daily basis. So looking at it from the outside (ie: design for the "typical" cruiser) a sea chest may be worse as you just increased the number of failure points while adding cost and complexity to the design and construction of the boat.
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Old 22-10-2018, 07:36   #60
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Re: Thru hull counts

3 thru hulls and how many miles of pipe work? It’s always a trade off.
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