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Old 19-04-2015, 05:51   #1
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Sea strainer on outflow side of raw water pump

I have a 1977 Westerbeke 40, and its been great. Any thoughts on putting a sea strainer on the outflow side of the water pump">raw water pump so that it would prevent impeller bits from clogging the heat exchanger? It would also provide a quick visual of impending impeller failure.

I've thought about installing one but all sea water strainers I've seen have been on the suction side of the raw water pump. Would one of those work? Or would it have a shortened life (read inopportune failure) because it is installed on the pressurized side of the raw water pump?

Just curious.
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Old 19-04-2015, 06:00   #2
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Re: Sea strainer on outflow side of raw water pump

On my Lagoon 500 the Onan 11KW generator suffers of short lived impeller, forcing me to change them every 200hrs when lucky
I installed a strainer between the raw water pump and the heat exchanger tired of having to fish impeller peaces out of the exchanger.
Has been a year and so far no problems, still have to change impellers way too often, but this way I can see the peaces in the bowl of the strainer and change the impeller before it fails.
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Old 19-04-2015, 11:15   #3
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Re: Sea strainer on outflow side of raw water pump

Jedi did exactly that as well on his main engine.
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Old 19-04-2015, 11:27   #4
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Re: Sea strainer on outflow side of raw water pump

I'm sitting here trying to picture it but I'm pretty sure that's how my Volvo TAMD41P is built. From thruhull and seacock to pump and the to the strainer.
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Old 19-04-2015, 11:45   #5
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Re: Sea strainer on outflow side of raw water pump

It should run from seacock to stainer to pump. The added small strainer after the pump is mostly to catch pieces of impeller should they break off.
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Old 19-04-2015, 12:43   #6
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Re: Sea strainer on outflow side of raw water pump

Many thanks to you all who've posted a reply. I guess now I'll be searching for a suitable sea strainer.
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Old 19-04-2015, 12:54   #7
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Re: Sea strainer on outflow side of raw water pump

If it was for a generator, I'd do it.

For my main engine, I'd just swap the impeller out regularly.
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Old 19-04-2015, 12:56   #8
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Re: Sea strainer on outflow side of raw water pump

Quote:
Originally Posted by Valiant173 View Post
Many thanks to you all who've posted a reply. I guess now I'll be searching for a suitable sea strainer.
I did this 2 yrs ago,after removing & cleaning rubber bits out of my heat exchanger.
I have a Groco between seacock & RW pump intake & installed a Jabsco? plastic filter,picked up on ebay $40,between RW pump output & engine.
Will be much easier to clean(5min.),than half a days work to clean HX.
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Old 20-04-2015, 09:44   #9
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Re: Sea strainer on outflow side of raw water pump

Sounds like a reasonable idea. I can't believe the pressure on the engine side of the raw water pump would ever cause a problem to a modern strainer (Vetus, Forespar, etc.)

Chuck
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Old 20-04-2015, 09:52   #10
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Re: Sea strainer on outflow side of raw water pump

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Originally Posted by Chuck Hawley View Post
Sounds like a reasonable idea. I can't believe the pressure on the engine side of the raw water pump would ever cause a problem to a modern strainer (Vetus, Forespar, etc.)

Chuck
I don't really know how much pressure a RW pump can push,if it was choked off by a plugged strainer,exh.ell,etc.
Perhaps someone will tell us.
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Old 20-04-2015, 10:03   #11
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Re: Sea strainer on outflow side of raw water pump

Something like the strainer below could be plumbed into the engine's R.W. pump output side to catch the impeller vane bits - hopefully without any resistance buildup except when the R.W.pump impeller vanes actually get into it. This strainer comes in just about all sizes and is used in the boat's potable water system.
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Old 20-04-2015, 10:17   #12
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Re: Sea strainer on outflow side of raw water pump

As I posted above, here is a photo of my stock Volvo TAMD41-P. Seacock to pump to (stock) strainer.
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Old 20-04-2015, 10:58   #13
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Re: Sea strainer on outflow side of raw water pump

Nice, clean engine room.
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Old 20-04-2015, 11:31   #14
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Re: Sea strainer on outflow side of raw water pump

the strainer in osirisail post is exactly what I installed, and works great.
Only thing is the mesh a little too fine, after a while some foul grow on it, it doesn't reduce the flow, but it is difficult to see the impeller bits inside.
I plan on replacing it for bigger one, at the end it is just to avoid big chunks of rubber to clog the exchanger, but still haven't found it, I'll try to make one ...
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Old 20-04-2015, 11:44   #15
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Re: Sea strainer on outflow side of raw water pump

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Nice, clean engine room.
Thanks. I try to keep it that way. A clean engine room makes it easier to find problems early and of course it minimizes tracking dirt and grease into the boat.
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