Plumbing sink drain to head intake - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #11  
Old 03-07-2009
CLucas's Avatar
Senior Member
 
Join Date: Feb 2007
Location: Glen Head, NY
Posts: 420
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 8
CLucas is on a distinguished road
Send a message via AIM to CLucas
Quote:
Originally Posted by JohnRPollard View Post
This topic comes up occasionally, and at first it seems like such an obvious solution that everyone begins to wonder why all builders don't set-up their systems like this at the factory. But they don't typically do it this way, probably for a variety of reasons.

One issue is that sink drain seacocks/thru-hulls are usually much larger than the head/engine intake sea-cocks. So there could be a concern about constricting the flow, especially if any debris goes down the drain. If that drain/intake gets clogged by sink debris, it could take the toilet partially out of commission.

Also, drain thru-hulls usually are not as far below the waterline as intake thru-hulls. If your head intake thru-hull is a foot or two below the waterline, you could easily end-up with a lot of "standing water" in your sink drain. This may lead to as much or more stink than you are trying to cure by giving the head a fresh water rinse.

One more concerning is healing. If your head intake/sink drain is closer to the centerline of the boat, and the sink is outboard, the sink can easily end-up below the waterline, or even below the intake/drain when the boat is healed. So if you open the thru-hull to flush the toilet, you had better have a way to prevent the water from gravity draining up, into, and out of the sink.

So think it through a bit before taking the plunge. We've had good results with simply adding water to the head (we have the same shower arrangement as Christyleigh, but a cup of water from the sink works almost as well).
Good thoughts to consider, John. In my situation, my head intake is closer to center line than the sink drain seacock. The head intake is also underneath the vberth -- while access is not difficult, it is not convenient (need to move a vberth cushion and raise a panel. My plan is to not even open the head seacock (unless fresh water stores are low), so the chance of any backflow is unlikely or impossible. Fair warning regarding sink debris, but the head sink is used pretty much only for hand/face washing.

Unless I'm missing something, I think the concerns you raise are more applicable to those who use the same thru-hull for sink drain and head intake.
__________________
s/v Grey Goose
1977 Pearson 30 #995
~~~~~~_/) ~~~~~~
Reply With Quote Quick reply to this message Share with Facebook
  #12  
Old 03-08-2009
JohnRPollard's Avatar
Moderator
 
Join Date: Mar 2007
Location: Chesapeake
Posts: 5,680
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 10
JohnRPollard is a jewel in the rough JohnRPollard is a jewel in the rough JohnRPollard is a jewel in the rough
Quote:
Originally Posted by CLucas View Post
Good thoughts to consider, John. In my situation, my head intake is closer to center line than the sink drain seacock. The head intake is also underneath the vberth -- while access is not difficult, it is not convenient (need to move a vberth cushion and raise a panel. My plan is to not even open the head seacock (unless fresh water stores are low), so the chance of any backflow is unlikely or impossible. Fair warning regarding sink debris, but the head sink is used pretty much only for hand/face washing.

Unless I'm missing something, I think the concerns you raise are more applicable to those who use the same thru-hull for sink drain and head intake.
Okay, let me see if I've got this straight now:

Your goal is to have a freshwater flush for the head. You will get the fresh water for flushing the toilet from the head sink. You plan to "T" off the sink drain, and run a line to the toilet pump intake. You will run the faucets in the sink whenever you need water for flushing the toilet.

You will no longer be using the salt/lake-water intake for the toilet. That seacock is not easily accessible and will remain closed pretty much all the time.

Therefore, you will not be using the head intake seacock as the sink drain. Instead, you will continue to use the sink drain for its intended purpose.


Okay, now that I've walked myself through it, I see your plan better. Something in your initial post led me to think you'd be doing it a bit differently.

The remaining question is about the need for the diverter valve at the "T". Without it, you will have to close the sink drain seacock and first fill the drain line with water before it will divert at the "T". So, depending on how long that drain line is -- you might want the diverter valve. Personally, I'd install it.

You may still have issues when the boat is heeled with being able to operate the sink faucets when you need flush water. Gravity may conspire against you.

Again, this is where the set-up that Christyleigh and we have is in many respects simpler and more fail-safe. What we do is we grab the combination shower/faucet head (which is on a 6-8 foot retractable hose) and simply spray the fresh water in the toilet bowl directly. (With the added benefit that Christyleigh pointed out of a pressure wash!)
__________________

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

Pacific Seacraft Crealock 31 #62

NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT
Reply With Quote Quick reply to this message Share with Facebook
  #13  
Old 03-08-2009
Valiente's Avatar
Senior Member
 
Join Date: Jun 2006
Location: Toronto
Posts: 5,491
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
Valiente has a spectacular aura about Valiente has a spectacular aura about
Quote:
Originally Posted by CLucas View Post
Unless I'm missing something, I think the concerns you raise are more applicable to those who use the same thru-hull for sink drain and head intake.
Perhaps I should emphasize that the head intake/sink drain combo thruhull seacock is normally CLOSED at all times...except when the head is being pumped or the sink is being drained directly out.

In fact, all thru-hulls except the seawater engine intake and the two cockpit drains are closed at all times...except when a sink needs draining.

My goal in life is to reduce open holes in boats and to reroute all vent lines to the top of the cabin, insofar as this is practical. The common way of doing things makes me nuts.
__________________
Can't sleep? Read my countdown to voyaging blog @
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message 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:

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

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Parts for sink drain overholtzer S2 1 09-07-2007 05:07 PM
head water intake smell JHodor Gear & Maintenance 2 10-04-2006 11:41 AM
Updating Your Head Sue & Larry Gear and Maintenance Articles 0 12-25-2002 08:00 PM
Head Maintenance Blues Tom Wood Gear and Maintenance Articles 0 11-21-1999 08:00 PM
Head Maintenance Blues Tom Wood Her Sailnet Articles 0 11-21-1999 08:00 PM


All times are GMT -4. The time now is 08:08 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.