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Old 12-27-2013, 07:57 PM   #11
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Re: plumbing vent and hepvo

I have not had any smells from my black tank vent, and it drains out fast using the 3 inch slinky, the grey water is fast as well, never had a problem dumping the tanks,and best of all no holes in roof
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Old 12-28-2013, 11:04 AM   #12
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Re: plumbing vent and hepvo

I'm thinking the hepvo valves would work as well passing air to the tank as they do water so you'd only need a small vent at the tank. When you dump the tank the hepvos (presumably) would open up and provide basically a 1 1/4" one way vent.
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Old 12-28-2013, 02:39 PM   #13
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Re: plumbing vent and hepvo

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Originally Posted by roach711
I'm thinking the hepvo valves would work as well passing air to the tank as they do water so you'd only need a small vent at the tank. When you dump the tank the hepvos (presumably) would open up and provide basically a 1 1/4" one way vent.
Hepvo valves do not allow air to pass through. If they did, they would not work for what they were invented for. The vent needs air to pass freely both ways.


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Old 12-28-2013, 08:20 PM   #14
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Re: plumbing vent and hepvo

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Originally Posted by nat_ster
Hepvo valves do not allow air to pass through. If they did, they would not work for what they were invented for. The vent needs air to pass freely both ways.
Admittedly, I have no personal experience with the product, but the design suggests that it would have to pass some air toward the tank once the water drained through the valve.

Imagine a slug of water going down the drain pipe pushing air ahead of it into the tank and also pulling air behind it from the sink. The water column would draw air through the hepvo and the tank vent would vent the pressurized air going into the tank. Once the water column settles in the tank the hepvo would close keeping water and air from coming back into the sink.

The tank vent needs to pass air both ways because the tank will be both filled and drained. The sink drain requires that air flows only toward the tank. A cheater vent and, presumably, the hepvo valves pass air only toward the tank.

So, at least theoretically, I stand by my suggestion. The small tank vent would handle the small air volumes from showers and sinks draining but may be too small to efficiently dump a black tank through a 3" drain line. In that case there would be a negative pressure in the entire drain system which (may) open the hepvo valve and provide additional tank venting.
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Old 12-28-2013, 09:47 PM   #15
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Re: plumbing vent and hepvo

roach711
I hear what your saying about the small vent on the black tank, I have a 1/2 pex vent on my 30 gals black tank, and it dumps just fine , no problems at all
its all good
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Old 12-28-2013, 10:17 PM   #16
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Re: plumbing vent and hepvo

Thanx GB. We can argue theory and "what should work" all day long, but nothing beats the guy who comes along and says "I did it this way and it worked just fine."
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Old 12-28-2013, 11:33 PM   #17
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Re: plumbing vent and hepvo

Quote:
Originally Posted by roach711
Quote:
Originally Posted by nat_ster
Hepvo valves do not allow air to pass through. If they did, they would not work for what they were invented for. The vent needs air to pass freely both ways.
Admittedly, I have no personal experience with the product, but the design suggests that it would have to pass some air toward the tank once the water drained through the valve.

Imagine a slug of water going down the drain pipe pushing air ahead of it into the tank and also pulling air behind it from the sink. The water column would draw air through the hepvo and the tank vent would vent the pressurized air going into the tank. Once the water column settles in the tank the hepvo would close keeping water and air from coming back into the sink.

The tank vent needs to pass air both ways because the tank will be both filled and drained. The sink drain requires that air flows only toward the tank. A cheater vent and, presumably, the hepvo valves pass air only toward the tank.

So, at least theoretically, I stand by my suggestion. The small tank vent would handle the small air volumes from showers and sinks draining but may be too small to efficiently dump a black tank through a 3" drain line. In that case there would be a negative pressure in the entire drain system which (may) open the hepvo valve and provide additional tank venting.
Well worded description of the system and your point.

If it ever douse start chugging at the waste dump, anyone could just open their toilet to release the suction. Might speed up the dump even if your not having problems.

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Old 12-29-2013, 08:16 AM   #18
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Re: plumbing vent and hepvo

This is my next project...a porcelain throne, I am using a low water unit modified for even less water

Do I really need a 3 inch vent?

I don't read codes....or I wouldn't of guided the 2 prong plug into wall with my finger
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Old 12-29-2013, 12:06 PM   #19
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Re: plumbing vent and hepvo

Quote:
Originally Posted by nat_ster
If it ever douse start chugging at the waste dump, anyone could just open their toilet to release the suction. Might speed up the dump even if your not having problems.

Nat
Another good point. Just shows there's more than one way to skin a cat.

Bansil - GBStewart says his black tank has a 3" dump drain and a 1/2" PEX vent and drains without "glugging."

I believe the electrical code pretty much leaves the the plugging in of cords up to us to figure out (and, for the record, you aren't the only on who's figured out the wrong way to plug in).
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Old 12-29-2013, 02:19 PM   #20
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Re: plumbing vent and hepvo

Quote:
Originally Posted by bansil
This is my next project...a porcelain throne, I am using a low water unit modified for even less water

Do I really need a 3 inch vent?

I don't read codes....or I wouldn't of guided the 2 prong plug into wall with my finger
bansil

Because you will be using a regular residential toilet that need the massive volume change to induce the flushing, You may need a bigger vent line. To make this even more challenging, reducing the amount of flush water will make the flush less powerfull.

In the cabin I built last summer, I used a 1.5 inch waste vent pipe. It flushes well as long as you wait 30 seconds between flushes, so the big 3" drain line can clear the bubble. Your bus should do just as well, if not better. Your toilet will drop directly into your tank. The cabin has 8 feet of 3" drain pipe to pass through.

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