Holding tank vent.. - SailNet Community
 
LinkBack Thread Tools
post #1 of 10 Old 06-17-2007 Thread Starter
Senior Member
 
Join Date: Jun 2006
Posts: 398
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 10
 
Holding tank vent..

Looking for a holding tank vent through-hull or through-deck piece.

I have searched and the only thing out there is fuel tank vents and they seem to have very small openings. Will that be ok?

When the holding tank sucking machine starts up, won't the vent be the only place that the air can come into the system? Creating a strong vacuum?

What part did others use?

Thanks... (sleepy),
Roy
groundhog is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 10 Old 06-17-2007
Wandering Aimlessly
 
PBzeer's Avatar
 
Join Date: Nov 2002
Location: Cruising
Posts: 21,092
Thanks: 0
Thanked 94 Times in 91 Posts
Rep Power: 15
     
Best I can tell you is that my fuel vent and holding tank and water tank vents all look the same.

Currently at 34 44 23 N 76 40 45 W

John
Ontario 32 - Aria

Free, is the heart, that lives not, in fear.
Full, is the spirit, that thinks not, of falling.
True, is the soul, that hesitates not, to give.
Alive, is the one, that believes, in love.
JCP


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
- Website & Blog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
PBzeer is offline  
Quote Quick Reply Share with Facebook
post #3 of 10 Old 06-17-2007
Member
 
Join Date: Feb 2006
Location: So Pasadena, Fl.
Posts: 86
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
 
I have searched and the only thing out there is fuel tank vents and they seem to have very small openings. Will that be ok?

That will work. Just make sure its kept clean and open.

David
dsmylie is offline  
Quote Quick Reply Share with Facebook
post #4 of 10 Old 06-17-2007
Member
 
Join Date: Mar 2007
Location: RI
Posts: 33
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
I would suggest following the line from the tank. If you don't have a vent line creating suction is the least of your worries. You will have a geiser when you open the cap due to pressure build up. I was talking to a dock guy and he said a power boat had his vent plugged with wax. When he took the cap off to pump out the contents shot up in the air almost 10 feet.

Ollie
ollie820 is offline  
Quote Quick Reply Share with Facebook
post #5 of 10 Old 06-17-2007
Senior Moment
 
SailorMitch's Avatar
 
Join Date: Nov 2005
Location: MD
Posts: 1,931
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
 
I just replaced my holding tank and lines and am wrestling with the same issue. The vent on my tank is 5/8 inch hose that goes up to one of those little silver vents on the topsides just below the hull/deck joint. No way that allows the air to flow correctly in a 5/8 inch hose. What I plan to do is replace that vent fitting with a regular thru-hull so that the maximum amount of air can move freely in and out.

SailorMitch
Sailing winged keels since 1989.
1.20.09 Bush's last day the end of an error !! Hopefully we still have a constitution and economy left by then.


"Compassion and tolerance are not a sign of weakness, but a sign of strength." The Dalai Lama


good planets are hard to find-- a song by steve forbert


I have but one lamp by which my feet are guided, and that is the lamp of experience. I know no way of judging the future but by the past.-- Patrick Henry.
SailorMitch is offline  
Quote Quick Reply Share with Facebook
post #6 of 10 Old 06-17-2007
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
The holding tank is usually connected to the head and can draw air through the pump and water out of the bowl of the head on most boats. The vent is necessary to keep the holding tank from building up pressure, but isn't the only source of "air" into the holding tank when pumping it out.

In fact, I generally fill the head bowl with water just before I pumpout, and you can hear often hear the bowl being drained, and will know that the entire tank has been evacuated when the head bowl is empty. The water in the bowl also helps "rinse" the lines and the holding tank, which can help prevent odor problems from beginning.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #7 of 10 Old 06-18-2007
Quit calling me a member
 
Join Date: Oct 2006
Location: Connecticut
Posts: 111
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
Actually, one article I read (I think here on Sailnet) recommend two vent lines - the size is less important than the fact that you will get some flow with two opposite facing vents (i.e. one facing fwd, one facing aft) so that the breakdown of waste in the tank is aerobic vs nonaerobic (not stinky vs. stinky, respectively.) I have a single vent to a small deck fitting on my tank now, presumably similar to what's described above, but when I put the tank back in (after rebuilding my head this year and replacing the Groco with a Lavac) I will add a second vent line.
morganmike is offline  
Quote Quick Reply Share with Facebook
post #8 of 10 Old 06-18-2007
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
MorganMike-

It really depends on the size of the holding tank. Larger holding tanks will often require two vents, but a smaller one may be just fine with one.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #9 of 10 Old 06-18-2007
'87 Pearson 27'
 
jackytdunaway's Avatar
 
Join Date: Sep 2006
Location: Charlotte, NC
Posts: 513
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 9
 
i made it a point yesterday to have water in the toilet to see if it would empty and it wouldn't. Are some different or is there a problem with mine?
jackytdunaway is offline  
Quote Quick Reply Share with Facebook
post #10 of 10 Old 06-18-2007
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
Jacky-

It would help if you said what kind of marine head you have. Also, did you leave the pump lever in the flush dry position.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Holding tank or Fuel for Jeanneau Myblueheaven Gear & Maintenance 10 05-05-2009 01:37 PM
Holding tank location stoutwench Gear & Maintenance 17 04-11-2007 02:40 PM
Custom Holding Tank Mithril Gear & Maintenance 6 03-15-2007 03:48 PM
Holding Tank Questions John_colpitts Gear & Maintenance 14 08-31-2006 06:42 PM
Holding Tanks Tom Wood Gear and Maintenance Articles 0 06-10-1999 08:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome