I have two Shurflo* submersible bilge pumps that are going to get mounted to a leftover piece of 3/8" polycarbonate that will be positioned nearly vertical in A338's tiny narrow sump - which is right at the end of the glassed over encapsulated ballast under the bridgedeck.
I will, like others have done, put the tiny 3.75Amp 1000 pump at the bottom of the board and the humongous 8Amp 1500 pump about 9 inches above it.
As you know, the theory is that the little one will do 99% of the work and take care of piddlly stuff - and is cheaper to replace. The big one supposedly will move a lot more, more rapidly, and probably no where near enough in a real crisis.
There is room in the sump, barely.
The Shurflo pumps are modeled differently as to where the outlet hose is oriented.
But I think there is a way to get both hoses pointed aft while attached to the pull-board.
And there are no intuitive attachment points on the pumps for mounting.
It's possible that hose clamps could be used to strap the pumps to the board.
Each strainer can be attached to something flat underneath, but disengaging the two spring latches that hold the strainer on to the pump body is a problem - even on the midget.
Therefore designing someway that both pumps can be pulled up out of the sump is necessary.
While this sounds right, doing it with attached hoses and wires is a problem.
There can't be any swags in the hose as that limits 'head', so there isn't a possibility of extra hose length that would allow the pump array to be brought into a convenient position - like for unscrewing hose clamps, or clearing the strainers. And also for plain open access to the sump for cleaning.
I had to go with WaterWitch electronic buttons because there is no room for float switches in the sump OR on the board.
Anybody have success with WaterWitch?
HOSES:
Both pumps have 1 1/8" ID hose outlets.
It's a bit of an odd size and limits choices. At least I found that to be the case with Trident hose, your better known marine hose.
WARNING:
I ordered a custom length of Trident 1471180 Bilge/Livewell hose from pyacht. Clear with spiral black reinforcement. 1/8" wall.
I choose this because of the warranty and the specs said "no cuffs required."
When I opened the well SEALED shipping carton I was literally bowled over by the pungent, sweet, chemical smell!!!! Talk about Haz Mat!
Vinyl (PVC) hose, if it smells, is outgassing toxiins.
These are plasticisers called phthalates and have been poisoning people for years.
Phthalates mimic hormones and infiltrate our endocrine system.
ETC
So I wrote a letter to Mr Shields at dnshields@tridentmarine.com over a week ago. Asked him why would I put this crap down inside my boat?
I don't expect a reply.
If he did he would point out Trident has an alternative polyethylene hose of 1 1/8" ID that has cuffs every foot or so. Probably could have dealt with that. P. is relitively benign and probably has no odor at all.
Recommend you look into it.
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*Shurflo - Rule - Whale - Attwood - Jabsco -Johnson - Seachoice.
I went with Shurflo because there seems to be less !%^#$@!! about this brand on the web.
Maybe all these submersibles are 'throwaway' pumps, as one cruiser called his (Rule) pumps,
but Shurflo has a good warranty and forum-talk dependability.
Seasonal maintenance for the cruiser includes replacing ALL his bilge pumps. Not in my budget!
Dependable is a good word for a pump that lives half forgotten in the bowels of a boat.
If this installation works out, I'll carry spares of the 3-year Shurflo 1000 (355-100-00)
It takes at lot less water to sink a small boat like the Ariel. So getting it out really is a matter of efficiency and speed.
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ANTISIPHON LOOP
Forespar has a Marelon 1 1/8" vented loop (#903009). 1 1/8" barbed thru-hull (#906070)
Don't think Defender has these. VISA order direct from Forespar, 1-949-858-8820.
There is a brief 'Vented Loop' tutorial in Forespar's Tech Tips.
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I think I will exit the large bilge pump HIGH UP through the topsides (not sure where yet - as ready access to the hose on the thru-hull fitting is extremely important imco. Vented loop access also! But I'm seriously presuaded that the bottom pump can exit into the cockpit under the seat - with no anti-siphon needed. This would allow a relatively short hose and a visual on what's happening.
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way later EDIT (10/11) finally got pictures - if you go to ebb's photo gallery page
there is a photo of the pull board and some of its installation in the bilge: post #387
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