Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 11-06-2012, 20:28   #1
Registered User
 
seamaster's Avatar

Join Date: Aug 2011
Location: Vancouver, BC
Boat: Cheoy Lee Seamaster 47'
Posts: 28
Images: 3
Prefilter for Watermaker

what is a good oil separator filter and what is good air separator filter for a water-maker? (these go on the top of the 20 micron and 5 micron pre-filters) for some reason google did not help me on that one
any links are appreciated.
__________________

__________________
seamaster is offline   Reply With Quote
Old 12-06-2012, 06:26   #2
Sponsoring Vendor
 
Tellie's Avatar

Community Sponsor

Join Date: Oct 2007
Location: Hollywood, Fl.
Boat: FP Athena 38' Poerava
Posts: 3,046
Re: Prefilter for Watermaker

Quote:
Originally Posted by seamaster View Post
what is a good oil separator filter and what is good air separator filter for a water-maker? (these go on the top of the 20 micron and 5 micron pre-filters) for some reason google did not help me on that one
any links are appreciated.

Check out Village Marine. They have an oil water separator that works well on small units that doesn't use an actual filter.
Tellie is offline   Reply With Quote
Old 12-06-2012, 07:27   #3
Registered User
 
Jentine's Avatar

Join Date: May 2004
Location: Cruising on the hook
Boat: Beneteau 393, "Blackthorn"
Posts: 744
Images: 5
Re: Prefilter for Watermaker

The simple solution is to never make water where the incoming water is not pristine. Never in harbors or anywhere oil spills would occur or where you think a spill may occur..
__________________
Jim

We are what we repeatedly do.
Excellence, therefore, is not an act but a habit."
--Aristotle
Jentine is offline   Reply With Quote
Old 12-06-2012, 08:23   #4
Registered User

Join Date: Dec 2009
Posts: 617
Re: Prefilter for Watermaker

Is it even necessary? Being that the intake is about 3' below the surface...
__________________
AllezCat is offline   Reply With Quote
Old 12-06-2012, 11:19   #5
Registered User
 
seamaster's Avatar

Join Date: Aug 2011
Location: Vancouver, BC
Boat: Cheoy Lee Seamaster 47'
Posts: 28
Images: 3
Re: Prefilter for Watermaker

My intake will be 10-15 inches below surface but I will still prefer to have a oil separator as i have 2 membranes and it will be expensive to replace them.
My concern is that the water intake is not too far from the propeller wash area, therefore it might get some air in. that will destroy the membrains and possibly the HP pump.

Another question that I forgot to post in my original posting was to define if there is need for a scooper or just regular through-hull?
__________________
seamaster is offline   Reply With Quote
Old 12-06-2012, 19:53   #6
Sponsoring Vendor
 
Tellie's Avatar

Community Sponsor

Join Date: Oct 2007
Location: Hollywood, Fl.
Boat: FP Athena 38' Poerava
Posts: 3,046
Re: Prefilter for Watermaker

Quote:
Originally Posted by seamaster View Post
My intake will be 10-15 inches below surface but I will still prefer to have a oil separator as i have 2 membranes and it will be expensive to replace them.
My concern is that the water intake is not too far from the propeller wash area, therefore it might get some air in. that will destroy the membrains and possibly the HP pump.

Another question that I forgot to post in my original posting was to define if there is need for a scooper or just regular through-hull?

It's true, you shouldn't make water where you think there might be oil present in the water. But it's actually fairly rare that membranes suffer from oil damage. A lot more membranes are replaced from lack of care and understanding of how to take care of ones watermaker than they are from oil damage. In fact the vast majority of small boat watermakers don't have any oil filtration protection at all. It's a bit of over kill, but if it makes you feel more comfortable I still like VMs little separator. If works on a vortex principal, uses no power or cartridge, and is quite effective. Most watermakers can handle the small amount of air that gets into the tru hulls from normal operation. If you are in a power boat going 10+ knots then I would recommend not running your watermaker as you can introduce more air into the system. A forward facing scoop on your thru hull is a important feature especially on smaller watermakers. A straight thru hull has a tendency to create a small vacuum as your boat moves through the water. Similar to the effect you get when you blow across the top of a straw. Many smaller watermakers are sensitive to a negative vacuum on the intake side and production can be affected on many of them.
Tellie is offline   Reply With Quote
Old 12-06-2012, 21:00   #7
Registered User
 
callmecrazy's Avatar

Join Date: Jun 2010
Boat: Tartan 30
Posts: 1,548
Images: 1
Re: Prefilter for Watermaker

Shouldn't oil help keep the membrane in working order?
__________________
My Blog
callmecrazy is offline   Reply With Quote
Old 12-06-2012, 23:19   #8
Registered User
 
xymotic's Avatar

Join Date: Dec 2007
Posts: 1,076
Re: Prefilter for Watermaker

You may also need to take some tank water to backflush the filters/membranes, and it may be difficult/impossible to not have clorine in that water (which will kill the membrane) so a charcoal prefilter is fairly important.
__________________
xymotic is offline   Reply With Quote
Old 13-06-2012, 04:29   #9
Sponsoring Vendor
 
Tellie's Avatar

Community Sponsor

Join Date: Oct 2007
Location: Hollywood, Fl.
Boat: FP Athena 38' Poerava
Posts: 3,046
Re: Prefilter for Watermaker

Just a step backwards. What make and model of watermaker do you have seamaster?
Tellie is offline   Reply With Quote
Old 13-06-2012, 23:41   #10
Registered User
 
seamaster's Avatar

Join Date: Aug 2011
Location: Vancouver, BC
Boat: Cheoy Lee Seamaster 47'
Posts: 28
Images: 3
Re: Prefilter for Watermaker

I have 300gal/day AC motor SK water-maker.
I tried to find the VM little separator the you recommended, but i had no success with VM website. can you please send link to that product?
__________________
seamaster is offline   Reply With Quote
Old 22-06-2012, 07:27   #11
Registered User
 
seamaster's Avatar

Join Date: Aug 2011
Location: Vancouver, BC
Boat: Cheoy Lee Seamaster 47'
Posts: 28
Images: 3
Re: Prefilter for Watermaker

Tellie,
Did you see my post for the make and model of the watermaker?
__________________
seamaster is offline   Reply With Quote
Old 22-06-2012, 09:53   #12
Sponsoring Vendor
 
Tellie's Avatar

Community Sponsor

Join Date: Oct 2007
Location: Hollywood, Fl.
Boat: FP Athena 38' Poerava
Posts: 3,046
Re: Prefilter for Watermaker

Quote:
Originally Posted by seamaster View Post
Tellie,
Did you see my post for the make and model of the watermaker?

Sorry, it's the slow season for us here in the south when most everyone else heads north because of insurance and hurricane season. For me it's the beginning of my sailing season and I've been a bit busy getting my boat ready for a few long trips to the Islands. I'm not at work right now but there's an E-bay pic of the RAC 33-0750 Oil/Air separator for $122 now. Just enter the part number above on E-bay and you'll see it
For what you're looking to do this should be fine. Most people just don't need these type of filters on small boat watermakers. The nice thing about the VM unit is that it is maintenance free.
Tellie is offline   Reply With Quote
Old 24-06-2012, 22:22   #13
Registered User
 
svstrider's Avatar

Join Date: Apr 2003
Location: back on Gold Coast after sailing north to Thailand then east to Pacific via Irian Jaya, PNG & Solomons
Boat: Tennant 47ft Catamaran
Posts: 310
Re: Prefilter for Watermaker

Quote:
Originally Posted by xymotic View Post
You may also need to take some tank water to backflush the filters/membranes, and it may be difficult/impossible to not have clorine in that water (which will kill the membrane) so a charcoal prefilter is fairly important.
Second the use of a charcoal filter for any back washing through your pump & membrane. It is important that you change this filter every 6 months even if it does not do much work as I ruined a membrane that had only been used for 20 hrs by pickling through a 12 month old charcoal filter.
__________________

__________________
Paul & Kaspar de Wonda Dog
S/V "Pelican V"
"Trust not a living soul and step warily around the dead"
svstrider is offline   Reply With Quote
Reply

Tags
watermaker

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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:43.


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.