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Old 26-01-2016, 11:05   #1
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Beneteau Oceanis 40 Holding Tank Question

Hi there,

I recently replaced the waste pipe from the holding tank to the hull fitting, (a really shitty job). While doing so I noticed there were three pipes at the top of the tank. One goes directly up to the deck, the other to the WC and the 3rd... I have no idea what it is for.

The 4th pipe is the one I replaced which is on the bottom of the tank.

Does anyone know what the extra inlet pipe is for? I have the 2 cabin version with only 1 head.
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Old 26-01-2016, 11:10   #2
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Re: Beneteau Oceanis 40 Holding Tank Question

vent, maybe?
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Old 26-01-2016, 12:37   #3
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Re: Beneteau Oceanis 40 Holding Tank Question

I don't think it is a vent. It is the same size as the WC waste pipe and seems to head down behind the tank.

Beneteau Oceanis 40 - 2008
Netherlands
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Old 26-01-2016, 13:06   #4
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Re: Beneteau Oceanis 40 Holding Tank Question

There must be a vent hose to the tank or you could not flush the head. Some folks increase the hose size to eliminate odour from bacteria. Just a thought,good luck
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Old 26-01-2016, 13:54   #5
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Re: Beneteau Oceanis 40 Holding Tank Question

Normally on Beneteau, toilet to y valve. Y valve to overboard through hull Y valve to top of holding tank. Top of holding tank to deck pumpout fitting. Bottom of holding tank to macerator pump to through hull overboard discharge.

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Old 27-01-2016, 08:57   #6
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Re: Beneteau Oceanis 40 Holding Tank Question

Is it a Vacu Flush? that could be the pipe going to the vac pump
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Old 27-01-2016, 09:11   #7
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Re: Beneteau Oceanis 40 Holding Tank Question

On my Jeanneau, instead of a y-valve, there is a second dip tube outlet from the tank to a diaphram pump for overboard discharge (now plugged). You may even have something which looks like a second bilge pump, but isnt.
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Old 27-01-2016, 09:12   #8
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Re: Beneteau Oceanis 40 Holding Tank Question

Potential for grey water intake?



Quote:
Originally Posted by AFKASAP View Post
Hi there,

I recently replaced the waste pipe from the holding tank to the hull fitting, (a really shitty job). While doing so I noticed there were three pipes at the top of the tank. One goes directly up to the deck, the other to the WC and the 3rd... I have no idea what it is for.

The 4th pipe is the one I replaced which is on the bottom of the tank.

Does anyone know what the extra inlet pipe is for? I have the 2 cabin version with only 1 head.
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Old 27-01-2016, 10:26   #9
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Re: Beneteau Oceanis 40 Holding Tank Question

if its 1 1/2 hose think it is for overboard discharge, can you trace the line and see where it goes. possible macerator pump to thru hull
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Old 27-01-2016, 10:28   #10
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Re: Beneteau Oceanis 40 Holding Tank Question

Quote:
Originally Posted by Vasco View Post
Normally on Beneteau, toilet to y valve. Y valve to overboard through hull Y valve to top of holding tank. Top of holding tank to deck pumpout fitting. Bottom of holding tank to macerator pump to through hull overboard discharge.

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I second this response. What year is the beneteau
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Old 27-01-2016, 11:11   #11
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Re: Beneteau Oceanis 40 Holding Tank Question

2008

Beneteau Oceanis 40 - 2008
Netherlands
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Old 27-01-2016, 11:14   #12
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Re: Beneteau Oceanis 40 Holding Tank Question

Quote:
Originally Posted by Getweh View Post
Is it a Vacu Flush? that could be the pipe going to the vac pump
Manual hand pump

Beneteau Oceanis 40 - 2008
Netherlands
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Old 27-01-2016, 16:33   #13
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Re: Beneteau Oceanis 40 Holding Tank Question

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Originally Posted by antoha View Post
vent, maybe?
+1

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Old 27-01-2016, 16:50   #14
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Re: Beneteau Oceanis 40 Holding Tank Question

The hose3 coming from the bottom of the tank goes directly to a throughull for overboard discharge ... standard feature on Beneteaus.
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Old 27-01-2016, 16:58   #15
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Re: Beneteau Oceanis 40 Holding Tank Question

It is the vent. The vent runs down to almost the waterline there will be a thru hull on the side. The tank is gravity discharge overboard the hose you replaced. The head pumps into the top of the tank. The deck fitting you already know.
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