Evan Gatehouse wrote:

I don't think ABYC cares too much of what is downstream of the seacock.
Figure it out this way, if one of your PVC valves fail, it won't sink the
boat because you can close the seacock easily. You could also use Marelon
if you're worried about the strength of the PVC valves.

The only thing that worries me about all this manifold is the engine pump
starving the R.O. or AC pump because it sucks harder. On commercial ships,
the seachest is big enough to deal with this issue, but if I'm reading you
correctly, a single 2" intake is supplying everything?

I THINK I have that figured. The A/C is primarily so the female members
of the crew will come aboard. :-) It runs off of shore power only so the
times it will be operating while the engine is running will be rare and
the R.O. will never operate at the dock. The R.O. is engine driven and
can only operate up to 2200 engine RPM. Best I can figure the Yanmar
4JH3 draws about 12 GPM at 2200 RPM and the R.O draws 3.5 GPM. The
washdown pump is rated at 4 GPM but will probably draw less under
pressure so the total flow through the strainer will be a bit under 20
GPM.

I could not find any Cv figures for the 970 so I used 20' of pipe
equivelent. At the engine water Tee the pressure drop will be about .29
psi. The Tee is 10" below the waterline so the drop is less than the
head pressure. The 970 is self cleaning. Basically a garbage disposal
mounted to a strainer so strainer fouling should not be an issue.


--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
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