Because of my non-millionaire status I have never owned a) a very new boat or b) a very big one. I'm not complaining but it means I have led something of a sheltered life in the matter of modern boats - Jimi had to teach me how to steer with a wheel, Parahandy had to demonstrate these new fangled self tailing winches to me (where's the Tufnol gorn?). Moored in Cowes with some members of this forum the subject of through hulls came up. One HR owner admitted to having 27 (yes read it again 27) through hulls on his boat. Several said their seacocks were in inaccessible places. No one that I asked said they followed my practice of closing all seacocks when I leave the boat. You might think I'm excessively cautious... and in any case I only have 5 seacocks. But I have had a seemingly sound Yanmar water pump leak like hell from the back (where you can't see it).
So, does the panel think
From the first time I owned a boat with a seacock I started a habit of closing the thingies everytime I went off board. Out of habit, I still do this although boat is brand new and so are the seacocks.
Doesn't harm them if you close 'em, so why not? Don't forget to open the cooling water one before starting the engine.. but this is also a habit....
It does them good to be closed; anm inacessible seacock that has frozen open is 100% useless!
I am a methodical closer of all seven seacocks on my old boat, including the engine exhaust seacock, and they all have engraved plastic labels with arrows showing which way they close, and a softwood plug hung on a lanyard adjacent.
However, the previous owner had spent 33 years without realising that the cockpit drain seacocks even existed, and the old exhaust outlet, on the waterline, without a seacock, was a galvanic battery of copper, brass and mild steel piping, which eventually disintegrated with one blow of a hammer.
Through hull fittings are the Work of the Devil.
My old tub has two. A sounder fitting and an apparently superfluous seacock with no connection to anything. Never had an inboard or toilet fitted. It started leaking unobtrusively (only when the boat pitched and the stern dug in did the water level get high enough to dribble a bit of wet into the cockpit locker.
For 4 months the boat has been quietly sinking. I convinced myself it had a deck leak and pumped out regularly.
I'm capping it off after Easter.
John
I think you are right, I should shut off all the seacocks when I leave the boat.
Still. they have all been serviced and all the pipes coming off them checked, they all have a softwood bung attached by a bit o' string.
There are not many days that I don't go to the boat or any weeknds that I'm not onboard so as far as shutting it all down... not sure it's worth it.
Can't help 'aving so many holes, sorry mate, just got lots of sinks and bogs and stuff.
Forward heads - in - out =2
Sink/shower - out =1
Galley - In seawater - Out drain =2
Watermaker in - out - flush =3
Engine intake =1 (+1 exaust) =2
aft heads = in - out = 2
after sink/shower = 1
skupper drains = 2
cockpit drain = 2
Total = 17
Other holes
Prop shaft = 1
Log = 1
Depth = 1
Rudder stock gland = 1
Keel drain plug = 1
Total 22 holes (unless I scrabble around/check the drawing and find some more)
Oh all right then, inspected for any evidence of corrosion, checked for full & free effective smooth operation. Through hull element beaten with an 'ammer, pulled about, jiggled, tugged, poked, polished, antifouled, photographed.
Connecting pipes in sound condition. Double jubilee clips tight and not corroded.
I don't know this, but I am guessing that an insurance company might ask akward questions if your boat sank next to the pontoon with the seacocks all wide open......
All of the above, I reckon. I close the below-waterline ones whenever I leave the boat un-attended, but don't bother with the above-w/l ones unless leaving the boat for a week or so.