RE: Mystery water trap
We didn't replace ours, although the engine installation drawing for the Nic 345 shows a plastic Vetus waterlock, like the one shown at http://www.boatpartsandspares.co.uk/ekmps/shops/boatparts/images/vetus-waterlock-lp-50-1165-p.jpg
There are various sizes of waterlock, based upon the diameter of the exhaust pipe.
It looks as if C&N had problems in successfully mounting that silencer in the boat (perhaps it rattled against the hull when the engine was running !?) so they made a glassfibre cradle for it, which they then bonded into the bilge. The one in our Nic 345 was a few feet away from the engine, on the other side of a bulkead, below the aft cabin berth. It was just sat against the hull, with no fixing of any kind.
As I said previously, the diameter of the exhaust pipe was greater than the diameter of the spigots on the silencer. Do the diameters of the exhaust elbow and the silencer spigots on your boat match ?
If you decide to replace the existing silencer, I would suggest a plastic waterlock similar to that in the photograph, if possible, turned through 90 degrees, and simply laid upright, on the centreling of the boat, in the bilge, below where the existing silencer is.
Let us all know how things go.
--- In email@example.com, <yahoo@...> wrote:
Thanks to all who have replied to Water Trap question - helpful as always.
2 Questions to David Seer: I have discovered with the use of mirrors that my metal cylinder trap is bolted to the fibreglass body ie appears to be designed for the boat. Was yours like that? And the space I have btw the two runs of hose is only 360mm - what model of trap did you replace your cylinder with?
--- In firstname.lastname@example.org, <brianstannard@...> wrote:A water trap is sized so the standing water in the exhaust hose at shut down will not over fill it and flood the engine. I don't have a 35 so can't be more specific.
On Fri, Aug 23, 2013 at 2:59 AM, divonic <yahoo@...> wrote:
Our Nic 35, SIRENA IV (#155) collects water in her bilge, and there appear to be a number of reasons for this: I've seen the pressure relief valve from the hot water tank dribbling, and worked out the bar setting is too low compared to the water pump; we developed a leak in the toilet pump which I fixed; the previous owner blamed rainwater coming down the mast (I'm not convinced); and what appears to be an elderly watertrap is rusty and beginning to weep.
It's the watertrap I want to ask advice on - I have posted 2 photos in the new SIRENA IV album. It's a Vetus, but has no other markings on it - a simple metal cylinder approx 9" long and 5" diameter, and it's the only thing between the exhaust elbow and the transom. It sits under the galley floor, and the pipe then goes back under the quaterberth to the stern. The previous owner replaced the original engine in 2005 with a Beta 35, yet Vetus tell me they haven't made metal traps for 15 years or more - he was thorough and I'm surprised if he didn't replace it then.
I'm thinking of replacing it with a Vetus NLPH model, a tube shape that should fit under the floor, though I have not measured exactly yet.
First question is whether anyone has seen the same and what did you replace it with?
Second question is what capacity of trap do people have, and what other advice/experience is on offer?
Thanks! Nic & Lesley