Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 07-12-2015, 21:41   #16
Senior Cruiser

Cruisers Forum Supporter

Join Date: May 2012
Location: Hailing Minny, MN
Boat: Vancouver 27
Posts: 751
Images: 1
Re: Question about short RO membrane

The space thing was a real concern for me, too. I'm operating within pretty tight constraints on a 27'. That said, the 44" spectra CHE membrane that I managed to squeeze in there was one of the best things I've done, and I consider it one of the best uses of space on the boat. Having excellent quality water from a proven and highly efficient WM that only runs a few hours every couple days is, IMO, simply fing awesome. If you can somehow find a way to fit a larger one I doubt you will be disappointed.

I had to cut out and re-build a bulkhead under the settee to get it to fit. But looking back on it now, it was a small price to pay.
__________________

__________________
laika is offline   Reply With Quote
Old 07-12-2015, 21:44   #17
Registered User
 
funjohnson's Avatar

Join Date: Mar 2010
Location: Currently Indiantown FL
Boat: 37' aluminum pilothouse "Elements"
Posts: 1,846
Re: Question about short RO membrane

Do you have room high under a side deck in the lazarette? Typically an unused space and seems like it would make a nice area for a membrane houising.

Matt
__________________

__________________
MJSailing.com - Written Blog
Youtube MJ sailing - Vlog
funjohnson is offline   Reply With Quote
Old 07-12-2015, 22:22   #18
Marine Service Provider
 
SV THIRD DAY's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: La Paz, Mexico
Boat: 1978 Hudson Force 50 Ketch
Posts: 3,653
Re: Question about short RO membrane

Quote:
Originally Posted by zboss View Post
I was under the impression that maintenance normally meant pickling the membrane, swapping out the pre filters, flushing the membrane with RO water, and cleaning the filter basket.
You pretty much summed up all the maintenance I'm aware of....

The only maintenance on the pressure Vessels and end caps I know of is to lubricate the o-rings when you change the RO membranes every 5-7 yrs. Fittings need no maintenance and once per year or every 500hrs (I like once per yr) you change the oil in the Hp pump crank case.
__________________
SV THIRD DAY is offline   Reply With Quote
Old 08-12-2015, 05:46   #19
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,573
Images: 240
Re: Question about short RO membrane

Quote:
Originally Posted by Madehn View Post
Rich your answers and expertise freely given are much appreciated!!!!!
INDEED!
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 08-12-2015, 10:02   #20
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,342
Re: Question about short RO membrane

Quote:
Originally Posted by zboss View Post
Yeah, learning that we could put the membrane unit in the engine room made a big difference. We would have had no way to mount a 40" membrane anywhere in our cabin except of forward locker and that would have taken up too much critical storage space.

Errrr. what do you mean "due to maintenance of all the connecting fittings and end caps"? What kind of maintenance do those components require? I was under the impression that maintenance normally meant pickling the membrane, swapping out the pre filters, flushing the membrane with RO water, and cleaning the filter basket.
It was an inherited unit on a boat I bought. There was corrosion on the aluminum end caps and some of the fittings. I tried to disassemble and the end caps were stuck/corroded in place. I was surprised how cheap a new membrane and tube was. I could have probably fixed it up but decided to just go to the one long membrane as the 3 short ones hadn't been used in a long time anyway. It was a 120V unit but I changed it to engine drive.... and got the weight of the gen set and big 1.5 hp motor out of the catamaran.
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 08-12-2015, 15:08   #21
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Re: Question about short RO membrane

Quote:
Originally Posted by funjohnson View Post
Do you have room high under a side deck in the lazarette? Typically an unused space and seems like it would make a nice area for a membrane houising.

Matt
This is very good advice - and something a lot of us always forget. When I was installing our membranes, I was thinking about all the things that needed to be moved to make space in the area I wanted to mount in, and how we would lose that space. I was just sitting there thinking when I happened to look UP and realize that nothing ever goes in that top 6" of overhead - even when the locker is "full"!

Mark
__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 08-12-2015, 15:45   #22
Registered User
 
zboss's Avatar

Join Date: Sep 2011
Location: On a boat
Boat: Cabo Rico 38
Posts: 3,426
Re: Question about short RO membrane

Quote:
Originally Posted by colemj View Post
This is very good advice - and something a lot of us always forget. When I was installing our membranes, I was thinking about all the things that needed to be moved to make space in the area I wanted to mount in, and how we would lose that space. I was just sitting there thinking when I happened to look UP and realize that nothing ever goes in that top 6" of overhead - even when the locker is "full"!

Mark
Yes, that was the original plan until I heard that the membranes should not be mounted in the engine area. However, since we have been told that this should not be "that much" of a problem this is now the plan again.
__________________
zboss is offline   Reply With Quote
Old 11-12-2015, 10:50   #23
Registered User

Join Date: Jan 2006
Location: Rhode Island
Boat: Tayana FD-12
Posts: 612
Images: 6
Re: Question about short RO membrane

Quote:
Originally Posted by zboss View Post
Guys,

I am pricing out the cost of making my own watermaker because I do not have the space necessary to install a 44" or dual 21" elements without significant modification to our boat.

I found these 14" elements and I was thinking of ganging 2 or 4 of them together but since I am just learning about desal I have a few questions:

1) Would just a single 14" element produce drinkable water?

2) I found a diagram of a home built system that had two elements together but I could not determine from the diagram if the elements get hooked in parallel or in series. Which is better? Pro's and Con's?

3) Suppose I wanted to gang together more than 4 elements? Maybe 8? How do I determine the size HP high pressure pump I need?

I also found these for the housing:

2.5" x 14" Fiberglass/FRP Seawater Pressure Vessel F2514-14141000C WaterAnywhere

Are these vessels appropriate for the intended use?

Also, I found these membranes that appear to only need much lower pressure, which means you could use a much lower pressure pump I suppose... why don't people use these membranes?

2.5"- 14" Extra Low Energy RO Membrane, 190 GPD - M-T2514AXLE WaterAnywhere

Thanks...

- z
If you are going through the trouble of pressurizing salt water to 800 PSI, you should find a way to put at least one 40" membrane. Unless you are using a clark pump, you are going to be wasting a lot of energy. I found plenty of space under lazarette to put two 40" Pressure vessels, and C&C38 is more of a racer than a cruiser.
__________________

__________________
phorvati is offline   Reply With Quote
Reply

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Watermaker Membrane Question F51 Liveaboard's Forum 2 08-09-2015 14:06
Spectra Model 380c Membrane Question Kenomac Construction, Maintenance & Refit 5 24-06-2014 10:51
Filmtec SW-2540 RO Membrane Question akio.kanemoto Plumbing Systems and Fixtures 13 02-01-2012 14:19
Watermaker Membrane Question Meck Plumbing Systems and Fixtures 6 02-08-2011 08:06
membrane question phorvati Provisioning: Food & Drink 1 14-08-2006 20:48



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:06.


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.