I've been thinking about this for a while, but it so happens that the guts of my boat (1985 Tashing Baba 40) that now would be an easy time to install a crash pump. Before I spend $300 having missed something obvious, please poke holes in the idea.
Liberty pumps makes a 110V 1/2 HP sewage pump with a 2" discharge. It's rated at 8400 GPH w/ 5 ft head
. It pulls 23A starting and 12A running. This model is non-automatic i.e. no float
Liberty Pumps LE51M-2 - 1/2 HP Cast Iron Sewage Pump 2-Inch w/ 25' Cord Non-Automatic
It will fit quite well in the lower pit of the bilge
. It's no where near 5' from the bilge
to the waterline where the outlet would be, but let's use 8400 GPH for figuring.
thought is this:
some rails to the side of the pit and make a hold-down collar that bolts to the rails.
Run a 2" vented loop as high as I can and then back down to a thrihull just above the waterline on the stern.
Install a 30A circuit off the inverter
to an outdoor-rated switch box and outlet in the lazarette.
Run the 25' cord from the pump to the lazarette It's 10' maybe, so I have 15-is feet of cord left.
I know my inverter
will handle the surge (my A/C pulls similarly). I also have a Honda
EU2000i that should be able to run it.
This should cover 2 main scenarios:
1 - I blow a hose / through hull
/ whatever, and am taking water
faster than my electric pump
(Rule 3700) can clear it. Answer: flip the switch, start the engine
, and go deal with the leak. Even if I am taking water
on faster that the 8400 + some percentage of 3700 I can remove, it sure buys me a lot of time.
2 - I take a real hit, and even with pumps running, I end up in knee-deep water that has shorted out my batteries and inverter before I get it stabilized. I pull the generator
out, unplug from the now-dead outlet in the lazarette, plug
into the generator
, and proceed to de-water. As long as I have patched the hole well enough to flow <= 8400 gal, I'm somewhere between holding steady and slowly emptying.
For some of the obvious faults:
I always have between 5 and 10 gallons of gasoline on deck
( dink tank + 5 gal jerry can)
The generator lives in the lazarette with not much on top of it, and it gets run at least once a week.
Granted if we are pitching and rolling all over, a portable generator is a fail. But, if we are pitching and rolling that hard and taking on more that 8400 gal / hr, the game
is probably up.
Though / obvious fails / comments of any kind appreciated!