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Author Topic: Holding Tank Vent Question  (Read 210 times)

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Geoffreykwright

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Holding Tank Vent Question
« on: May 03, 2019, 06:06:20 AM »

Hi - I've got a question about the holding tank vent.  I've not re-routed the vent on my 34 Mk II (hull 1494, Y2K).  Still runs up thru a port-side stanchion.  I've seen vent air-filters which are available - presumably these would attach to the hose between the tank and the stanchion.  Has anyone had any experience with these?  Occasionally we get a whiff of the holding tank in the cockpit depending on the wind direction.   (We do our best to pump out regularly and we do use a tank conditioner).  Thanks in advance.
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Sundowner III
Catalina 34 Mk II Hull 1494 (Built 2000)
Toronto, CANADA

britinusa

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Re: Holding Tank Vent Question
« Reply #1 on: May 03, 2019, 06:43:19 AM »

Mk 1 here.

We had the sniff issues too!

I replaced the stanchion, and the hoses from the tank to the vent, including adding an elbow joint to avoid the kink that we had just below the stanchion connection.

We use Odorlos and pump out very often.

That has cured the swift sniff issue.

As it happens, trying to eliminate all sniff issues in the cabin, so, I'm about to replace the hoses from the head to the tank and tank to Macerator - macerator to waste pumpout fitting.

Paul
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Paul & Peggy
1987 C34 Tall Rig Fin Keel - Hull # 463

See you out on the water

Engine:M25XP

Roc

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Re: Holding Tank Vent Question
« Reply #2 on: May 03, 2019, 01:46:11 PM »

Peggie Hall does not advise using vent filters because they actually stop the free flow of oxygen into the tank, which makes the anaerobic bacteria thrive (that's what causes tank smell, you want aerobic bacteria, which needs air flow).  I kept my original stanchion vent, but per her advice, added a larger vent.  I cut a hole into the tank access cover and routed the vent line forward, through the side storage area, into the locker in the v-berth port side and out the hull below the sheer stripe.  You have to remove the port side cabinetry by removing the screws on the outer frame.  The whole modular unit will come out, frame and all.  She advised to make the run more of a 45 angle rather than straight up, for better air flow.  She suggested keeping the original vent for better cross ventilation.  I put a dose of odorloss at the end of being on the boat for the weekend, or extended weekend.  No "boat" smell.
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Roc - "Sea Life" 2000 MKII #1477.  Rock Hall, MD

Dave Spencer

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Re: Holding Tank Vent Question
« Reply #3 on: May 03, 2019, 07:06:42 PM »

What Roc said.   :thumb:
I got the same advice from a phone call I had with Peggie Hall several years ago.  Here's my project:
http://c34.org/bbs/index.php/topic,6861.msg45889.html#msg45889
Roc's looks better since he has a shallower slope on his forward vent hose.



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Dave Spencer
C34 #1279  "Good Idea"
Mk 1.5, Std Rig, Wing Keel, M35A Engine
Boat - Lion's Head, Ontario
People - London, Ontario

Geoffreykwright

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Re: Holding Tank Vent Question
« Reply #4 on: May 04, 2019, 06:03:29 AM »

Thanks to you all for your sound advice!
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Sundowner III
Catalina 34 Mk II Hull 1494 (Built 2000)
Toronto, CANADA

rmbrown

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Re: Holding Tank Vent Question
« Reply #5 on: May 06, 2019, 02:32:32 PM »

Roc, what messes with my head is that you have vertical clearance above your tank to run that vent without a dip.  Mine runs across the top of the tank but has to dip a bit to get under that fiberglass lip, making a water trap of sorts.
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Mike Brown
1993 C34 Tall Rig Wing Keel Mk 1.5
CTYP1251L293
Just Limin'
Universal M-35AC

Noah

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Re: Holding Tank Vent Question
« Reply #6 on: May 06, 2019, 02:41:31 PM »

I may be wrong but I think the MK11 might have l a smaller holding tank than the MK1?
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1990 hull #1014, San Diego, CA,  Fin Keel,
Standard Rig

Mick Laver

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Re: Holding Tank Vent Question
« Reply #7 on: May 06, 2019, 09:44:35 PM »

Not hard to imagine. I measured mine at 13 gallons to the very tippy top.
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Mick and Sherrie Laver
CINNAMON
1999 C34 Mk II #1432
San Diego, CA

rmbrown

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Re: Holding Tank Vent Question
« Reply #8 on: May 07, 2019, 03:23:47 AM »

Or the same tank... mine's B-179 from Ronco... but the locker is a little deeper.  I hadn't considered that!
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Mike Brown
1993 C34 Tall Rig Wing Keel Mk 1.5
CTYP1251L293
Just Limin'
Universal M-35AC
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