Vent Line greater than 45 degrees

[friendlobster]

I'm allowing for two large vent lines on a new tank (replacing bladder). The problem is that there's no way to route the vent hose without a steep slope greater than 45 degrees and the end of the run being almost vertical (90 degrees). The length is also about 5 feet which may be too long. Does this mean cross ventilation isn't going to happen.

Only one vent currently and if there's no advantage I don't want to run the second.

I searched but didn't find the answer. However, I am brand new to this forum and perhaps I just need a pointer to an existing answer.
thanks

 

[Peggie Hall HeadMistress]

No way? I'll bet there is...

The problem is that there's no way to route the vent hose without a steep slope greater than 45 degrees and the end of the run being almost vertical (90 degrees).

If that's only due to the location of the current vent thru-hull, the solution is simple: install a new thru-hull.

A 5' long vent line is pushing it, but it's still barely within the limit for a 1" diameter vent line.

Where in the boat is the tank going? Where's the head located? Where's the current vent thru-hull?

 

[friendlobster]

The tank is going in the port side V-berth. The Head is located aft of the v-berth on the other side of the bulkhead between them. The vent line runs from under the v-berth at a low angle through the bulkhead and then straight up on the other side to a thru-hull just below the rub rail. That vent is 24 to 30" higher than the top of the holding tank (I'll have to measure to be sure).

To get a 24" to 30" rise at 45 degrees would take 34" to 43" inches laterally. I might be able to move the thru-hull about 33" aft and perhaps I can gain some by bring the vent hose closer to the underside of the v-berth. I'll have to go measure carefully. But thanks for the nudge.

The new 2nd vent line I was thinking of running to the bow area. But I can't do that at 45 without going up the side of the v-berth in plain sight and interfering with the occupant space. Now perhaps that is what to do and I have to "suck up and deal". But I was trying to keep the vent line "behind the scenes" by coming up in the anchor bow locker.

 

[Peggie Hall HeadMistress]

Your plan for the 2nd vent is the best one...

If we can do it right, you should only need one and it shouldn't have to be in plain sight...and I THINK the key to that is the location of the vent fitting on the tank. If you'd like to brainstorm this, shoot me an email.