Hej på dej, Dragon:
Quote: "My boat is on land over the winter now but somehow quite a lot of water very slowly but steadily leaked from somewhere and periodically collected above the keel
Lets see if we can help you along here :-) Your concern is water you say. As others have said in posts above, what your picture shows appears to be a fuel tank with associated fittings, so it is MOST unlikely that that is where the fluid comes from. If it were, you'd certainly know it, for diesel fuel stinks, as I'm sure you know. I think we can eliminate that installation
as the source of your problem. But it concerns me a little that you say that you didn't know it was there. You should probably use the winter to go through every nook and cranny in your boat and familiarize yourself thoroughly with its various installations.
You didn't say which coast of Sweden
you are on. If you are in Gothenburg, for instance, there isn't really a need to haul out
for the winter, so I assume you are more likely to be on the east coast
north of Kalmar, where the climate warrants hauling out. Because you are hauled out, water in the bilge is most likely to have come from your fresh water tank
. In you boat there would not normally be any appreciable amount of water in the WC and the associated plumbing
except when the WC is actually in use. Your fresh water tank
is most likely to be found under a seat or bunk. You will likely find it under the "V"-berth right forward. Due to the shape of the tank, it is not likely to burst even if water in it freezes, but the tubing that leads from the tank to the faucets at galley
sink and hand basin in the toilet can definitely burst if the water in it freezes. When the ice in the tubing then thaws, it will the leak out of the tubing and accumulate in your bilge. But that is a "one time" event that is observable after a frost.
In you case, because your boat is forty or fifty years old, it is more likely that the tubing has developed pin-holes so that water from the tank can seep out very slowly. If you have mopped up the water in the bilge on one visit to the boa,t and then find more water in the bilge the next time you visit the boat, such a pin-hole (or several) is likely to be the cause.
In your boat, I'm sure, there will be drains in the cockpit called "scuppers". The rainwater and melting snow will be taken via one or more hoses from these scuppers in the cockpit floor to one or more through-hull fitting(s) that lets the water go overboard
. If wet snow that has accumulated in this plumbing
gets hit by frost it can freeze into an ice-plug that now prevents further drainage. If the plug
expands enough to burst the plumbing, all drainage thenceforth will go into your bilge rather than overboard
So you see, there are several possible reasons for your problem. I recommend highly that, as I said above, you inspect every nook and cranny of your boat. One of our members - "boatpoker" is his screen
name - has most generously made this article available to us:
Marine Survey 101, pre-survey inspection
I recommend that using this article as a guide you learn your boat "inside out", so you can take preventive action to correct any deficiencies and not be surprised by things that go wrong.
Your present problem is not really a difficult one to fix. The difficulty is in pinpointing with certainty the source of the bilge water.
Go have a really, really good look to identify that source. Then come back to us to let use know what you find. When you've done that, we'll tell you how to "winterize" a boat on the hard
, so you don't get these sorts of problems :-)