Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 06-10-2014, 10:44   #1
Senior Cruiser
 
Randyonr3's Avatar

Cruisers Forum Supporter

Join Date: Nov 2007
Boat: Beneteau FIRST 42
Posts: 1,836
Plugging the Vent Tube

Been looking but cant seem to find what I'm looking for.. need assistance..
On the vent tube of the holding tank, looking for a type of a flapper valve that will allow vent without allowing solids to pass.. I have a filter above the tank to filter the nasty air comming out, but when the tank is full, it shoots up the vent tub and destories the filter..
and its uasally when the grand-kids come to visit.. not watching the tank level and it over-fills..............
any help finding a valve or a stop system for the tank.
__________________

__________________
Randyonr3 is offline   Reply With Quote
Old 06-10-2014, 10:53   #2
Registered User

Join Date: Dec 2011
Location: Boston Area
Boat: Beneteau 423
Posts: 223
Re: Plugging the Vent Tube

You should never fill your tank that far. And if you block it as you propose, the pressure might build up and cause the tank or something else in your system to rupture.
__________________

__________________
hlev00 is offline   Reply With Quote
Old 06-10-2014, 10:57   #3
Registered User

Join Date: Dec 2011
Location: Boston Area
Boat: Beneteau 423
Posts: 223
Re: Plugging the Vent Tube

P.S. Get all the grandkids to help replace the filter next time it happens. They'll be a lot more attentive to the tank monitor.
__________________
hlev00 is offline   Reply With Quote
Old 06-10-2014, 11:24   #4
Registered User
 
denverd0n's Avatar

Join Date: Jun 2008
Location: Tampa, FL
Posts: 3,949
Images: 6
Re: Plugging the Vent Tube

I have to agree that the solution is not some kind of valve as you propose. Perhaps a tank level monitoring system, that will sound an alarm when it gets about 3/4ths full?
__________________
denverd0n is offline   Reply With Quote
Old 06-10-2014, 11:41   #5
Registered User
 
Terra Nova's Avatar

Join Date: Apr 2007
Location: Marina del Rey, California
Boat: Freya 39 cutter- Terra Nova
Posts: 3,645
Re: Plugging the Vent Tube

Quote:
Originally Posted by hlev00 View Post
You should never fill your tank that far. And if you block it as you propose, the pressure might build up and cause the tank or something else in your system to rupture.
Quote:
Originally Posted by denverd0n View Post
I have to agree that the solution is not some kind of valve as you propose. Perhaps a tank level monitoring system, that will sound an alarm when it gets about 3/4ths full?
Hard to add anything to this. When you get tired of replacing filters you will become more attentive to emptying the tank on time.
__________________
1st rule of yachting: When a collision is unavoidable, aim for something cheap.
"whatever spare parts you bring, you'll never need"--goboatingnow
"Id rather drown than have computers take over my life."--d design
Terra Nova is offline   Reply With Quote
Old 06-10-2014, 11:46   #6
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 17,037
Re: Plugging the Vent Tube

There is a valve that is nothing more than a ping pong ball in a tube, when liquid floats the ball, it seals shut, it's very much like the valve in any wet or dry vac that shuts off air flow before the water gets pumped though the electric motor.
I know of the existence of these valves, but don't have a source, sorry
__________________
a64pilot is offline   Reply With Quote
Old 06-10-2014, 11:48   #7
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 4,332
Re: Plugging the Vent Tube

A. Don't fill the tank.

B. Don't even consider a flapper; if you keep pumping the tank will blow.

Instead, use an overflow with the liquid filled trap, like under a sink. As you can see, the vent rises from the tank and either Tees to the filter or can over flow through the loop. Gases do not go out the trap because it is filled with water, like a P-trap.

Basic plumbing such as you would find in any house (every house has multiple roof sewer vents).



I've had this system for over 3 years. I did replace the clear hose with white sanitation hose (the clear hose not only permeates, it also kinks.
__________________
Gear Testing--Engineering--Sailing

Writing full-time since 2014.
Bookstore:http://sail-delmarva.blogspot.com/20...ook-store.html
thinwater is offline   Reply With Quote
Old 06-10-2014, 18:12   #8
Senior Cruiser
 
Randyonr3's Avatar

Cruisers Forum Supporter

Join Date: Nov 2007
Boat: Beneteau FIRST 42
Posts: 1,836
Re: Plugging the Vent Tube

Quote:
Originally Posted by a64pilot View Post
There is a valve that is nothing more than a ping pong ball in a tube, when liquid floats the ball, it seals shut, it's very much like the valve in any wet or dry vac that shuts off air flow before the water gets pumped though the electric motor.
I know of the existence of these valves, but don't have a source, sorry

good answer, and thanks, using the ping-pong ball, I can make the unit with a couple pieces of PVC and reducers.... the complete piece would be no longer/ taller than a couple inches..
Thanks again,
__________________
Randyonr3 is offline   Reply With Quote
Old 06-10-2014, 19:34   #9
Registered User
 
Terra Nova's Avatar

Join Date: Apr 2007
Location: Marina del Rey, California
Boat: Freya 39 cutter- Terra Nova
Posts: 3,645
Re: Plugging the Vent Tube

That is not a good idea. The tank vent needs always to remain open.
__________________
1st rule of yachting: When a collision is unavoidable, aim for something cheap.
"whatever spare parts you bring, you'll never need"--goboatingnow
"Id rather drown than have computers take over my life."--d design
Terra Nova is offline   Reply With Quote
Old 06-10-2014, 19:40   #10
Registered User
 
Dsanduril's Avatar

Join Date: Aug 2011
Location: South Pacific
Boat: Outremer 50S
Posts: 1,451
Re: Plugging the Vent Tube

I'm with the rest of the team, you really don't want the chance to plug the vent. But, if you insist, and if you don't want to build your own, you're looking for an "air release valve":

Plastic Air Release Valves
__________________
Dsanduril is offline   Reply With Quote
Old 06-10-2014, 20:54   #11
Registered User
 
northoceanbeach's Avatar

Join Date: Mar 2008
Location: California
Boat: Cape Dory 28
Posts: 445
Re: Plugging the Vent Tube

It's considered bad form to use the head for anything other than liquid waste. This should solve your problem.
northoceanbeach is offline   Reply With Quote
Old 06-10-2014, 21:54   #12
Senior Cruiser
 
Randyonr3's Avatar

Cruisers Forum Supporter

Join Date: Nov 2007
Boat: Beneteau FIRST 42
Posts: 1,836
Re: Plugging the Vent Tube

Quote:
Originally Posted by Dsanduril View Post
I'm with the rest of the team, you really don't want the chance to plug the vent. But, if you insist, and if you don't want to build your own, you're looking for an "air release valve":

Plastic Air Release Valves
I knew someone would come up with the unit.........

Be it a good Idea or bad, its the choice I've made.. Been on the boat living aboard for 12 years now, been sailing for over 40, and on the very rare occasion will the tank be full enough that it would back up the vent tube.
I'm not that stupid people, I've rebuilt this boat from one end to the other and would go to say I've replaced every screw and pin on the boat.
Even if and I say If the vent was blocked off completly, the force would be directed through the Electro San and overboard throu the throu-hull.
at the present the vent is blocked off completely when the level reaches the filter, I'm just stopping the waste from getting to the filter..
And the system has been working fine for the last 10 years or so and does not need to be re-designed.. the piece is only there to protect the filter...

But thanks to all for trying to re-design my freggin boat for me.....
__________________
Randyonr3 is offline   Reply With Quote
Old 06-10-2014, 22:06   #13
Registered User
 
Dsanduril's Avatar

Join Date: Aug 2011
Location: South Pacific
Boat: Outremer 50S
Posts: 1,451
Re: Plugging the Vent Tube

We're not redesigning your boat, you are We're telling you to leave it alone

There are lots of different manufacturers of the valves out there, see if you can look at a cross-section (as the link posted has) and evaluate how hard it will be to clean out if the $h1t every gets up there. The simple floats are the easiest, avoid like a plague (in this service) and valves that have levers and linkages.
__________________

__________________
Dsanduril is offline   Reply With Quote
Reply

Tags
plug

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Replacing Nicro Solar Vent w/ Beckson Marine Passive Vent bahamarich Product or Service Reviews & Evaluations 2 24-09-2013 12:18
Vent Tube Size? BlackOak Plumbing Systems and Fixtures 12 05-05-2013 05:55
Drilling Hole In S/s Square Tube Weakening Tube? HueyHuey Construction, Maintenance & Refit 19 07-01-2013 17:30
Matching Different Size Hoses Up (Nicro Vent to Vent Hose) rebel heart Plumbing Systems and Fixtures 5 11-10-2010 11:18
November 3 - Plugging Right Along skipgundlach General Sailing Forum 0 03-11-2007 14:17



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:39.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.