Electric Bilge Pumps.

fisherman said:
If it's belt driven on the engine, is it below W/L? If so it will be wet when using seacock inlet. The norm is to make a valve chest with several ball valves to different bilges/seacock. There are 'run dry' impellers if there is a worry, but I've never bothered, it isn't dry for long because the outlet pipe goes upwards and water sits there, drains back to the pump.
Click to expand...

Yes the Jabsco would be belt driven off the engine and it would be below seal level.

Good idea: I will use ball valves to change the suction to different sections of the bilge.:)

"When using a seacock inlet" Sigh..... I built a beautiful strong hull and now I'm puncturing holes in it. I have one for the engine, two for the toilet outlets, two for the toilet inlets and now one for the deck wash and I'll need one for a water-maker when I fit one: I suppose there is no way of getting around it?

Clive
 
I'd better elucidate. Galvanised pipe, a row of 'tees' connected together, on the suction side of the Jabsco. Off each tee is a ball valve and non return valve in the case of the bilge, each connected to the relevant pick up, seacock for washdown/firefighting, or any bilge. There could be one to a deck fitting with long suction hose which can be used to pump out a boat alongside. The outlet is a flexible hose for deckwash, or discharge overboard when emptying the bilge. the reason for the non return valves is that it's entirely possible to leave the seacock inlet and a bilge inlet open, which will fill the boat, or leave the discharge hose overboard after bilge pumping, it will syphon back. The valve chest should be somewhere handy, on deck preferably.
 
coopec said:
Yes the Jabsco would be belt driven off the engine and it would be below seal level.

Good idea: I will use ball valves to change the suction to different sections of the bilge.:)

"When using a seacock inlet" Sigh..... I built a beautiful strong hull and now I'm puncturing holes in it. I have one for the engine, two for the toilet outlets, two for the toilet inlets and now one for the deck wash and I'll need one for a water-maker when I fit one: I suppose there is no way of getting around it?

Clive
Click to expand...

yes, as above the washdown inlet could be a hose thrown overboard, but troublesome if under way.
 
fisherman said:
I'd better elucidate. Galvanised pipe, a row of 'tees' connected together, on the suction side of the Jabsco. Off each tee is a ball valve and non return valve in the case of the bilge, each connected to the relevant pick up, seacock for washdown/firefighting, or any bilge. There could be one to a deck fitting with long suction hose which can be used to pump out a boat alongside. The outlet is a flexible hose for deckwash, or discharge overboard when emptying the bilge. the reason for the non return valves is that it's entirely possible to leave the seacock inlet and a bilge inlet open, which will fill the boat, or leave the discharge hose overboard after bilge pumping, it will syphon back. The valve chest should be somewhere handy, on deck preferably.
Click to expand...

Thank you for that: I follow what you are saying.
 
fisherman said:
yes, as above the washdown inlet could be a hose thrown overboard, but troublesome if under way.
Click to expand...

As much as I hate punching holes in the hull (underwater) I think I need one for the inlet of the jabsco and a deck fitting for the outlet of the Jabsco for deck washing

Clive
 
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coopec said:
As much as I hate punching holes in the hull (underwater) I think I need one for the inlet of the jabsco and a deck fitting for the outlet of the Jabsco for deck washing
Click to expand...

It is possible and has been done to fit a pipe on the transom, suction hose plugs into the top, but not tidy. However if you intend to have a roving suction hose, (as the Newlyn Harbour workboat has, for emergency pumping another vessel) then no problem to park it on a transom suction pipe.
 
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