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Old 11-02-2013, 11:10 AM   #1
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Ballast Tank, sealing bilge pump wiring.

Hi,

Im in the process of installing a ballast tank in my 22ft speedboat and would prefer to dump water via bilge pumps instead of draining by gravity. Since the bilge pumps have to be submerged, The 12v wires have to come out of the tank and wired to the battery. What is the best way in your experience to seal the 12V wires coming out of the tank without having any leaks when the tank is being fill and/or full of water?

Thanks.
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Old 11-02-2013, 12:36 PM   #2
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just get a waterproof cable gland from any electrical wholesale place dude, something like this

www.uk.farnell.com/jsp/displayProduct.jsp?sku=1174595&CMP=KNC-GUK-FUK-GEN-LISTINGS&gross_price=true&mckv=MGdGvzqH|pcrid|prod uctlistings
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Old 11-02-2013, 12:37 PM   #3
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Run them through a cable gland, put a squeeze of sikaflex or silicone into the gland before tightening it up. Should do it.
If you put the two wires through a length of heat shrink where they exit the tank it might make it easier to seal too.
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Old 11-02-2013, 05:23 PM   #4
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http://cgi.ebay.co.uk/ws/eBayISAPI.d...E:L:OC:GB:3160

Ended up buying this. Looks Neat :-)
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Old 11-02-2013, 06:18 PM   #5
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Nice , i got these from Jhon Archer very happy with them
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Old 15-02-2013, 01:24 PM   #6
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I was thinking of installing an electric actuator connected to the 33c cable which operates the water pickup, then having a dual switch button which activates and retracts the actuator hence lowering and retracting pickup, to avidi installing another shifter. Has this been ever done?
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Old 18-02-2013, 04:13 PM   #7
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Originally Posted by bep078 View Post
I was thinking of installing an electric actuator connected to the 33c cable which operates the water pickup, then having a dual switch button which activates and retracts the actuator hence lowering and retracting pickup, to avidi installing another shifter. Has this been ever done?
I was thinking the same! however this is my latest idea,

The principle is to allow the bi - directional pump a feed of water and also so stop any water pressure building up unnecessarily.

Water enters the scoop fitted on the bottom of the hull, near the transom, which then goes through the stop cock, then through a non return valve. this is so that water is always flowing in one direction, so when emptying the ballast air + water is not going to be forced under. plus i doubt any ballast pjmp would be able to push against the flow under speed.

It then goes to the tee for the pump, and then through the upper valve. this stops the backflow of water at low speeds and allows the pump to suck only water from the scoop.

Just had an idea - this system would work very well with a leg shower, as there shoud be water being constantly flowing at speed!

So there you have it, minimal pressure on the ballast pump yet water on demand at all times!

Will
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Old 19-02-2013, 02:32 PM   #8
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I intend to use the ballast pickup scoop just to fill the tank then retract when full. Then the bilge pumps do the job of draining the water in the tank out. I got 2 x 3000 gph pumps to this should not take a lot of time to dump the water. I was thinking of controlling the cable which operated the pickup via an actuator which is controlled by a switch on the dash. (much more tidy and easy)
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Old 19-02-2013, 02:47 PM   #9
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Yeah i spose if you already have that set up, it makes sence, i havnt got any pumps yet!

Im sure you will find something that would do the job, theres loads of stuff on fleebay ect, just wonder if theres a waterproof one. other than that, have a cheeky look at car door lock actuators, they dont half give a push and would be fairly cheap!

Good luck
Will
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