pur watermaker installation/engine intake - 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? 
  #1  
Old 05-05-2008
rrgane's Avatar
Lost
 
Join Date: Mar 2007
Location: Everett
Posts: 69
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
rrgane is on a distinguished road
pur watermaker installation/engine intake

i have been reading through the Katadyn manual looking for a likely place to install my watermaker, and it occurred to me that installing a 'T' off the water intake for the engine would be ideal right after the the strainer. the one concern i have is the manual warns not to install like this if there is negative pressure (i am going to assume that is big science talk for vacuum) at the 'T'.

i know that the engine cooling system is sucking water in, and creating 'negative pressure' but i do not know if it would be appreciable, and if it is, would installing a check valve solve it?

running the watermaker when the engine is not running wouldn't be a problem, but that seems pointless as that is when you would want to run it the most, grabbing electricity from the motor.

am i trying too hard to make it easy, and should i just bite the bullet and install an additional thru-hull?

thoughts?
__________________
SV Ivy
Islander 29
Universal M3-20B
Port Of Everett

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
  #2  
Old 05-05-2008
artbyjody's Avatar
Senior Member
 
Join Date: Jan 2008
Location: Bellingham, PNW
Posts: 3,146
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
artbyjody is just really nice artbyjody is just really nice artbyjody is just really nice artbyjody is just really nice
I wouldn't install it off the sea intake for the engine - however, if you have a head on board - you probably have a water intake somewhere near. And that would make more sense to tap off a T anywhere down the line. Also another area would be the galley if it has a sea valve as well (some do as its used for the wash cycle - and fresh for the rinse)...
__________________
-- Jody

S/V "
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
" -
1983, Barberis Show 38! or
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



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
  #3  
Old 05-05-2008
Zanshin's Avatar
Senior Member
 
Join Date: Aug 2006
Location: Germany
Posts: 2,208
Thanks: 0
Thanked 15 Times in 15 Posts
Rep Power: 9
Zanshin is on a distinguished road
I might use another through-hull water source than the engine-intake one, but for a somewhat different reason - since watermakers are sensitive to oil I would choose one as far away as possible from the engine in order to lessen the likelihood of ruining the element.
__________________

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

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
  #4  
Old 05-05-2008
Freesail99's Avatar
Senior Member
 
Join Date: Feb 2006
Location: New Jersey
Posts: 4,507
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Freesail99 will become famous soon enough
Send a message via Yahoo to Freesail99
I wil put another seacock in just for the watermaker. Nether place sounds like a good place to draw water, I would want to drink.
__________________
S/V Scheherazade
-----------------------
I had a dream, I was sailing, I was happy, I was even smiling. Then I looked down and saw that I was on a multi-hull and woke up suddenly in a cold sweat.
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
  #5  
Old 05-05-2008
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
The best place to draw water for an RO watermaker would be a sink or A/C water intake. I wouldn't use the engine one for two reasons. First, oil contamination of the membrane will basically destroy it. Second, compromising the cooling water on the engine is generally a bad idea.

The head intake has the possibility of contaminating the filter with fecal matter... not too good an idea and a good way to destroy the RO membrane again.

If you don't want to install a separate through hull for it, setting up a raw water manifold might be a good option, if you've got another raw water through hull that you could put the manifold on.

One of my friends has an RO watermaker and the intake hose is rigged to the anchor washdown pump raw water intake, which is forward of both the head and engine, and reduces the chances of contamination from boat-related sources of possible pollution, at least while underway and to some degree while at anchor.
__________________
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.
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 05-05-2008
Senior Member
 
Join Date: Apr 2008
Posts: 476
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
negrini is on a distinguished road
Send a message via AIM to negrini Send a message via Yahoo to negrini Send a message via Skype™ to negrini
Well, oil contamination is not a real problem, as ....

many boats does have a siphon killer, isolating any possible returning water, so it would be a double measure against the possibility. What really deny you using engine intake, is the strong negative pressure created by your engine raw water pump. Regardless the engine, this is always a big negative pressure on your "T". In case you make it, your entire running hoses, clamps, attachments, and all your gear at the watermaker, should have strong dimensions to stand such pressure. Your installation would have to be such a type of engine cooling system, rather a simple transparent and easy for inspection system. Even installing a check-valve, just imagine the amount of power to break it in, your poor pour would have to do. Sounds to me like those guys diving at 10 mts, thinking they could suck down air from a simple hose. Give up, and find another hole .....
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 05-06-2008
beej67's Avatar
Senior Member
 
Join Date: Apr 2008
Posts: 257
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
beej67 is on a distinguished road
Is there a reason he couldn't T it into the intake hose for his head instead? Maybe with a Y valve?
__________________
beej67, Checkered Past, 1980 32' Pearson 323, Panama City FL

Last edited by beej67; 05-06-2008 at 11:13 AM.
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
head water intake smell JHodor Gear & Maintenance 2 10-04-2006 11:41 AM
Watermaker on Sailboat J-42 Cruising & Liveaboard Forum 5 01-25-2002 08:56 PM


All times are GMT -4. The time now is 02:24 AM.

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.