Offshoreonly.com - Shut off valve for raw water

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- - Shut off valve for raw water (https://www.offshoreonly.com/forums/general-q/267988-shut-off-valve-raw-water.html)

1 MAIDEN AMERICA

01-02-2012 11:54 AM

Quote:

Originally Posted by 1 MAIDEN AMERICA (Post 3582909)

What size BV's are people using?
Strainers I have are 1" NPT
H2O Pumps I have are 1" NPT
Original hose was 1.25" from PU, through pump, to engine.
Most PU's I see are 1.25"
I've seen transom plate adapters that are only .75" NPT where stock was a 1.25" neck.

How much HP can a .75 NPT feed?
How about 1" NPT?

What size should the hoses, valves, and fittings be to the raw water pump?

Young Performance

01-02-2012 12:39 PM

Typically they are done in 1" NPT. That is roughly the same size as 1 1/4" hose. If you add ball valves, be sure to get "full flow" ball valves. CP Performance has some nice SS full flow ones. I think they are about $60-65 each for 1" in SS. You could also check McMaster Carr or Fastenal.
Eddie

pslonaker

01-02-2012 04:25 PM

Quote:

Originally Posted by US1 Fountain (Post 3583755)

I always thought any water hose below water line are supposed to be double clamped. But then Merc doesn't follow that ruling, so..???

I want to say that you are right on this double clamp or rule of thumb thing, but when you actually have one of those other clamps in your hand and you can see the quality of the clamp...you will see what I mean when I say that you will only need one clamp per connection. You can actually tighten this clamp down so tight that it will cut the hose off.

f_inscreenname

01-02-2012 05:33 PM

I always found it funny that the suction side of a raw water system required two clamps but yet the pressure side only requires one.

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