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  Topic Review (Newest First)
10-22-2015 04:35 PM
Capt Len
Re: Sea Water Strainer

Jim, probably everyone noticed. Boaty problems and opinion of solutions remain constant .It's the viewing public that changes.
10-22-2015 03:03 PM
doctorcam
Re: Sea Water Strainer

Or cares? ;-)

Timely for me, regardless - I'm about to replace everything from the thruhull inward, engine included!
10-21-2015 08:18 AM
JimsCAL
Re: Sea Water Strainer

Wow, a 12-year old thread and no one notices!
10-21-2015 07:25 AM
albrazzi
Re: Sea Water Strainer

Quote:
Originally Posted by overbored View Post
if you loose prime then you have an air leak. if the strainer and all piping are completely sealed it make no difference where the strainer is in the line. it is just a fat section in the pipeline. because it is on the suction side of the pump you can have a leak that will let air in and will not leak water out.
Right, as long as the Motor is running. Below the water line it will do both but at different times. That suction leak will turn into a real leak if the leak is below water line. From a point of view that the strainer is the most likely source of failure you may choose it put it above the WL but then again it might just not be practical. Choices..
10-20-2015 01:51 PM
Capt Len
Re: Sea Water Strainer

Losing prime after cleaning can't happen if below wl. Checking thruhull ingress is possible too. Not so if above. At least the sea valve gets tested, which is good. The raw water pump is often below wl so a failure there is either direct from ocean or syphon over thru the strainer No matter .thats what the valve is for.
10-20-2015 01:23 PM
overbored
Re: Sea Water Strainer

if you loose prime then you have an air leak. if the strainer and all piping are completely sealed it make no difference where the strainer is in the line. it is just a fat section in the pipeline. because it is on the suction side of the pump you can have a leak that will let air in and will not leak water out.
10-20-2015 12:14 PM
Woodvet
Re: Sea Water Strainer

Quote:
Originally Posted by asdf38 View Post
Well it should be said that many strainers don't recommend installation below the waterline because they're not willing to take the liability. Though real life sometimes dictates otherwise.
One needs no reminders that real life bears no USCG approval or shall the well paid surveyor dole out any positives to the o'mighty insurer. After all it's only a masquerade to disguise death's face just below the water.
It's there...
If you really wanna look...
And its' there -where all laws go out the window. If you're afraid of dying there are no warrantees you can purchase not a hull that can't be found or a sailor that can't be drown... No corner of the earth you can hide...
There are adventurers, and then there are sales persons who know every approach. Boats will break and taxes to take, seems the whole world is on your back.... Oh, but to sail....
Oh' but to sail out there where you need not heed the orders of the uniform or conform to ideals of fashion. But to touch the hem of god and see how the stars are cast and the waves the soon wafts with her mere appearance.
All we know for certain is that nothing lasts...
It never lasts...
10-14-2015 09:07 PM
asdf38
Re: Sea Water Strainer

Well it should be said that many strainers don't recommend installation below the waterline because they're not willing to take the liability. Though real life sometimes dictates otherwise.
10-14-2015 09:12 AM
Woodvet
Re: Sea Water Strainer

I often strain my coffee through my thick eye brows but it gets hairy...
You are so right cap...
SO, lesson learned: strainer is always placed slightly below the water line.
Be sure and close the seacock before clearing the basket...

I had a boat once that spit a small bit of it's exhaust water out on the cockpit sole where it ran down the scuppers. Told me when then raw water was clogged or the impeller was not up to it's task.
Seemed odd till I had some seaweed in my engine intake.
I also heard of hag fish clogging it up as well but that was a fishing boat.
I liked it after that... I figured out you can't always hear the exhaust, and in rough seas I never feel comfortable leaning out to sea...
09-17-2015 03:50 PM
capta
Re: Sea Water Strainer

I'd be inclined to locate my sea strainer below the waterline, as anytime the pump goes dry (water running back into an air pocket in the sea strainer) it is damaging the impeller each revolution.
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