converting raw water head to fresh water - Page 2 - SailNet Community
Reply
 
LinkBack Thread Tools
post #11 of 18 Old 06-24-2010
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
         
Using the head sink drain line allows the sink to act as a vacuum break and eliminates any risk of cross-contamination.
Quote:
Originally Posted by RichH View Post
You should consider to follow standard 'sanitary' piping rules and regs. so that the fresh water system isnt 'retrograde contaminated' from the toilet/head !!!!

... and this isnt easy to do on a boat. Check valves, y valves, etc. CAN NOT do the job of protecting a fresh water system from retrograde contamination.
To do this job properly you have to 'cobble' a system that functions similarly to a household toilet .... the water system delivers to ***separate Tank*** and the separate tank delivers to the toilet ****through an 'air gap'****. The separate tank has a valve on the INLET of the fresh water to the separate tank and that valve ***IS ABOVE THE LEVEL OF THE WATER in the separate tank***. Thats the NSF and 'sanitary' regs.' for all 'toilets' in the USA where the 'supply water' is connected to POTABLE water. This PREVENTS harmful bacteria from entering 'retrograde' into the potable water supply ... bacteria moving against the normal flow of water.

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
Sponsored Links
Advertisement
 
post #12 of 18 Old 06-24-2010
Paul J - C27 Owner
 
Join Date: Jan 2009
Location: Minnesota
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
simple solution

On my C27, the sink drain and head raw water intake use the same through hull. I leave the through hull valve closed. To flush the head, fill the sink 1/2full with clean tank water, then switch head to wet bowl and pump. This drains the sink into the intake line of the head. No replumbing necessary and give you option of using raw water if you prefer by simply opening the seacock on the through hull.
PaulRJordan is offline  
Quote Quick Reply Share with Facebook
post #13 of 18 Old 06-24-2010
Iroquois MkII
 
Join Date: Feb 2007
Location: Massachusetts
Posts: 241
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
I keep it a lot simpler than this, I just have a 1 gallon jug of spring water on the floor in the head. When I need to flush, just pour some in the bowl.
LookingForCruiser is offline  
Quote Quick Reply Share with Facebook
post #14 of 18 Old 06-25-2010
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 problem with that is that it will put extra wear on the head pump's seals, since the intake side is constantly working without any lubrication. The pumps on the heads are not designed to work that way. It is a really bad idea, at least in the long term, to use a head that way. Also, 1 gallon won't last for more than a few flushes, if you're flushing with enough water to clear the lines of any waste. If you're not clearing the lines of waste, then, you're asking for a nasty hose permeation/clogging problem to set in.

Quote:
Originally Posted by LookingForCruiser View Post
I keep it a lot simpler than this, I just have a 1 gallon jug of spring water on the floor in the head. When I need to flush, just pour some in the bowl.

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 #15 of 18 Old 06-01-2011
Senior Member
 
turbulicity's Avatar
 
Join Date: Jan 2011
Location: Redwood City
Posts: 179
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
 
Hope I can revive this thread a little. I am living aboard and I currently flush with raw water. It smells although the head is used frequently.

I don't like the idea of T'ing from sink discharge thru-hull since that means I either have to pump everything from sink to the holding tank or constantly have to reach in and turn the thru hull on and off.

I was thinking of T-ing the head inlet from the sink drain hose but at a position just above the waterline. After all, from waterline up to the sink, the hose is filled with fresh water all the time. So, I can wet-pump the head a couple of times without closing the sink discharge thru-hull and it would pull in the fresh water standing in the hose. If more is needed, run the faucet a little and pump more.

Does this sound reasonable? Am I missing something?

1978 Gulfstar 50'
Clark Sailing Dinghy 10'
turbulicity is offline  
Quote Quick Reply Share with Facebook
post #16 of 18 Old 06-01-2011
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,501
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
If the T is in the drain above the waterline you will pump air.

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #17 of 18 Old 06-01-2011
Senior Member
 
Stu Jackson's Avatar
 
Join Date: Jul 2001
Posts: 886
Thanks: 0
Thanked 14 Times in 13 Posts
Rep Power: 15
 
Holding Tank Failure & Fresh Water to Head from the Sink in the Head FLIX

Two pages, with discussion about dos and don'ts.

Stu Jackson, C34, 1986, M25 engine, Rocna 10 (22#)
Stu Jackson is offline  
Quote Quick Reply Share with Facebook
post #18 of 18 Old 06-02-2011
Senior Member
 
turbulicity's Avatar
 
Join Date: Jan 2011
Location: Redwood City
Posts: 179
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
 
Quote:
Originally Posted by mitiempo View Post
If the T is in the drain above the waterline you will pump air.
Sorry, didn't make this clear enough. My sink (as most do, I suspect) drains rather slowly. So I can T from just above the waterline on the sink drain hose. Run the faucet and start pumping the head. Would be nice to have a valve there at the T-joint so that I can go back to raw water flushing on long trips.

1978 Gulfstar 50'
Clark Sailing Dinghy 10'
turbulicity 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
Engine Overheating-Restricted raw water rk6johnson Gear & Maintenance 1 10-30-2009 11:54 AM
Water, Precious Water Michael Carr Cruising Articles 0 09-02-2004 08:00 PM
Water, Water Everywhere Tania Aebi Cruising Articles 0 06-14-2004 08:00 PM
Updating Your Head Sue & Larry Gear and Maintenance Articles 0 12-25-2002 07:00 PM
Head Maintenance Blues Tom Wood Her Sailnet Articles 0 11-21-1999 07:00 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