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Old 27-01-2014, 14:05   #1
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Black Tank design - need advice please

I am designing a black tank and want to make sure I haven't forgotten anything before I hand the design over to the manufacturer and wonder if the forum can add any ideas or suggestions.

I will have an black water inlet, an outlet for an air vent, an outlet for a pump-out, and outlet for a drain through-hull, and an auxiliary outlet to feed another tank. I will add one or two inspection hatches.

The tank is about 100 litres, will receive from a Blake Lavac manual toilet, and will be made of plastic (for tanks).

Does it make any difference where the pump-out outlet is situated? Presumably it should be positioned at the bottom of the tank to aid evacuation of the tank?

I have never pumped out a tank before...so what do you do...do you close off all inlets and outlets and just leave the vent open before you pump-out...or??

Thanks for your help everybody.
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Old 27-01-2014, 17:21   #2
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Re: Black Tank design - need advice please

Some notes:
Make sure the Vent is positioned so that fumes do not get drawn back inside.
same outlet for discharge via pump and Y valve to thru hull OR pump out.

Make sure black water thru hull can easily be accessed for shut off and maintenance.
Why do you want an auxiliary tank?


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Old 27-01-2014, 18:13   #3
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Re: Black Tank design - need advice please

Make it gravity drain if you can mount it above the WL. Line up the deck pumpout with the hole for the drain so you can clean it out with a stick if needed.
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Old 28-01-2014, 14:04   #4
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Re: Black Tank design - need advice please

thanks for the advice.

i am mounting the black and grey water tanks above deck and taking the discharge back into the boat via through-deck mountings and they will then gravity feed through seacocks just below the waterline.

i will probably go with two vents to increase air flow, and use one of them as a pump-out.

my black tank is only about 100 litres, which is why i may add the auxiliary tank into the design.
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