why is my seacocks connected/wired to my engine

[Tranona]

crumbs, that is indeed what was said, even speed reading I should be able to tell the difference between "with" and "in"...

If you are still confused after this deluge of "information" - I suggest you visit the site I referred to earlier which has a concise explanation of the 3 conditions required for galvanic corrosion. Now you know the construction of ball valve seacocks you can make your own assessment of whether they meet those conditions.

 

[Firefly625]

If you are still confused after this deluge of "information" - I suggest you visit the site I referred to earlier which has a concise explanation of the 3 conditions required for galvanic corrosion. Now you know the construction of ball valve seacocks you can make your own assessment of whether they meet those conditions.

indeed I will, many thanks!

 

[MapisM]

is it bucket and chuck it!?

LOL, good one.
Sorry for the late reply, been busy cruising some areas right in the middle of nowhere, with poor or no mobile coverage.
You know, just to take some other of those clips for which you already asked the mods to ban me...
Will post one as soon as I'll be back, if you don't mind!

I'm not sure if you and virtuvas were just pulling my leg or what, anyway sea chests are a different way to supply seawater to all onboard systems which need it. They're a sort of long box, integrally attached to the inside of the hull, obviously in a point where the hull is below the waterline, but high enough to raise its top above the w/l, and closed with a removable transparent flange on its top. The seawater supply pipes are attached around the perimeter of such box, with valves like those used for seacocks.
The difference with thru hull seacocks, aside from not drilling many holes in the hull, is that if any pipe ever gets clogged, you can simply open the sea chest cover and remove the obstruction.
Since by design the sea chest is higher that the w/l, you can do that with no need to either dive or lift the boat.
Actually, this is more a ship than a pleasure boat arrangement (hence it's understandable that it's not well known), but there are indeed also a few pleasure boat builders which go that route.
That's why I called those perfectionists, rather than those who bond the seacocks - with all due respect for the latter, of course.

 

[Firefly625]

LOL, good one.
Sorry for the late reply, been busy cruising some areas right in the middle of nowhere, with poor or no mobile coverage.
You know, just to take some other of those clips for which you already asked the mods to ban me...
Will post one as soon as I'll be back, if you don't mind!

I'm not sure if you and virtuvas were just pulling my leg or what, anyway sea chests are a different way to supply seawater to all onboard systems which need it. They're a sort of long box, integrally attached to the inside of the hull, obviously in a point where the hull is below the waterline, but high enough to raise its top above the w/l, and closed with a removable transparent flange on its top. The seawater supply pipes are attached around the perimeter of such box, with valves like those used for seacocks.
The difference with thru hull seacocks, aside from not drilling many holes in the hull, is that if any pipe ever gets clogged, you can simply open the sea chest cover and remove the obstruction.
Since by design the sea chest is higher that the w/l, you can do that with no need to either dive or lift the boat.
Actually, this is more a ship than a pleasure boat arrangement (hence it's understandable that it's not well known), but there are indeed also a few pleasure boat builders which go that route.
That's why I called those perfectionists, rather than those who bond the seacocks - with all due respect for the latter, of course.

MapisM, once again I have learned 2 things, firstly that I know very little, the second about sea chests, thanks for the kind explanation!

Oh, and another video from you, although of course now banned AFAIK, I might just make time to watch it.

 

[Seahope]

Just make sure you don't wire your seacocks to your battery positive by mistake:

http://www.ybw.com/forums/showthread.php?t=271791

++++++++1

 

[Mr Googler]

I'm not sure if you and virtuvas were just pulling my leg or what, anyway sea chests are a different way to supply seawater to all onboard systems which need it. They're a sort of long box, integrally attached to the inside of the hull, obviously in a point where the hull is below the waterline, but high enough to raise its top above the w/l, and closed with a removable transparent flange on its top. The seawater supply pipes are attached around the perimeter of such box, with valves like those used for seacocks.
The difference with thru hull seacocks, aside from not drilling many holes in the hull, is that if any pipe ever gets clogged, you can simply open the sea chest cover and remove the obstruction.
Since by design the sea chest is higher that the w/l, you can do that with no need to either dive or lift the boat.
Actually, this is more a ship than a pleasure boat arrangement (hence it's understandable that it's not well known), but there are indeed also a few pleasure boat builders which go that route.
That's why I called those perfectionists, rather than those who bond the seacocks - with all due respect for the latter, of course.

I think Ark Royal was forced into dry dock a few years back due to a leaking sea chest. Maybe they should have thought about using seacocks Imagine the size they would need to be!!

 

[MapisM]

Oh, and another video from you, although of course now banned AFAIK, I might just make time to watch it.

Ok, just gimme a few days. The connection I'm using at the moment is a PITA for uploads.

 

[vas]

I'm not sure if you and virtuvas were just pulling my leg or what,

anyway sea chests are a different way to supply seawater to all onboard systems which need it. They're a sort of long box, integrally attached to the inside of the hull, obviously in a point where the hull is below the waterline, but high enough to raise its top above the w/l, and closed with a removable transparent flange on its top. The seawater supply pipes are attached around the perimeter of such box, with valves like those used for seacocks.
The difference with thru hull seacocks, aside from not drilling many holes in the hull, is that if any pipe ever gets clogged, you can simply open the sea chest cover and remove the obstruction.
Since by design the sea chest is higher that the w/l, you can do that with no need to either dive or lift the boat.
Actually, this is more a ship than a pleasure boat arrangement (hence it's understandable that it's not well known), but there are indeed also a few pleasure boat builders which go that route.
That's why I called those perfectionists, rather than those who bond the seacocks - with all due respect for the latter, of course.

MapisM, not joking at all, didn't know about them at all!

However, now that I have an idea about sea chests, 2Qs come to mind:

A. Anyone using them on smallish craft? [I counted 7 inlets in the 43ft Versilcraft I viewed for the second tme yesterday!, wouldn't mind not to have all these holes around tbh...]
B. doesn't such a thing create a drag on the hull when in planning speeds? Problems with water pressure built up in the chest?

cheers

V.

 

[MapisM]

2Qs come to mind:
A. Anyone using them on smallish craft? [I counted 7 inlets in the 43ft Versilcraft I viewed for the second tme yesterday!, wouldn't mind not to have all these holes around tbh...]
B. doesn't such a thing create a drag on the hull when in planning speeds? Problems with water pressure built up in the chest?

Sorry for the late reply, I didn't check the forum for a while.
A. not really small, afaik. The smallest I've ever seen was on a 55' boat, and even that was a custom built steel trawler.
In GRP production boats, a 58' is the smaller I'm aware of.
B. well, that depends on the shape/size/orientation of the water intake, surely. I don't think it should be a problem in principle - not anymore than normal seacocks are. Retrofitting a sea chest isn't a trivial job, anyway. I for one am sticking to seacocks, of which I also have 7...

 

[DAKA]

I believe there was an example of a bonded seacock corrosion issue posted on the forum about 5 years ago (might have been NickH ??).

His almost new Princess (assume bronze fittings) had one seacock that was corroded (not dangerously but looked a mess and needed replacement).
All the other seacocks were in perfect condition.

None of the seacocks were bonded with the exception of the corroded one which had been unwittingly bonded by the metal reinforced wire of the hose.

Seeing as my boat had been berthed at the side of it for two years it was proof enough for me that bonding bronze seacocks isnt right for UK leisure use and I deduce the conditions in the med arent that different unless the shore power is similar to French standards.

 

[nedmin]

When I used to moor alongside steel piling with my first steel boat the anode furthest away from the steel piling used to wear much faster than the one nearest.I could never understand why. I came to the conclusion that sacrificial anodes etc can be a bit of a minefield.As mentioned before on this forum my prop on present boat was suffering from de-zincification (turning pink) ,this was caused because the prop was not grounded to the hull.This was due to the oil on the gearbox bearings insulating the circuit.I mounted a carbon brush to run on the coupling and the problem was solved.