Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 14-04-2016, 11:20   #16
Registered User

Join Date: Jun 2005
Posts: 253
Re: Watermaker output low??

Considering that your TDS is still good, you an either use it as is, or buy a new membrane. Sodium Met does not last forever and in fact, I'd bet money that that was some stinky (rotten egg) water when you flushed it out after 2 years sitting without changing the pickling solution. Membrane manufacturers ALL recommended changing pickling solutions every three months on membranes. Just check out Dow's FilmTec website.
__________________

__________________
Jsta_Rebel is offline   Reply With Quote
Old 14-04-2016, 11:25   #17
Registered User
 
Training Wheels's Avatar

Join Date: Aug 2014
Location: Left coast.
Posts: 671
Re: Watermaker output low??

Just bought a Spectra 200T. It will be over year before we actually cut our docklines. What's the best way to preserve the new membrane? Leave it as is, new in the box, or hook it up and pickle it?


Sent from my iPad using Cruisers Sailing Forum
__________________

__________________
Training Wheels is offline   Reply With Quote
Old 14-04-2016, 11:35   #18
Registered User
 
nknowland's Avatar

Join Date: Mar 2010
Location: Currently in Brunswick, GA
Boat: Bayfield 40
Posts: 159
Re: Watermaker output low??

Quote:
Originally Posted by Jsta_Rebel View Post
Considering that your TDS is still good, you an either use it as is, or buy a new membrane. Sodium Met does not last forever and in fact, I'd bet money that that was some stinky (rotten egg) water when you flushed it out after 2 years sitting without changing the pickling solution. Membrane manufacturers ALL recommended changing pickling solutions every three months on membranes. Just check out Dow's FilmTec website.
Thank you for that confirmation. TDS is calibrated and working fine so I will replace membrane before heading out next season. So many posts say that people jump on the membrane when it's actually something else. One blog said they pickled their membrane for 6 years! Bah.... Easy enough repair to make. Thanks again for taking the time to reply.
__________________
nknowland is offline   Reply With Quote
Old 14-04-2016, 12:30   #19
Registered User

Join Date: Jun 2005
Posts: 253
Re: Watermaker output low??

Quote:
Originally Posted by Training Wheels View Post
Just bought a Spectra 200T. It will be over year before we actually cut our docklines. What's the best way to preserve the new membrane? Leave it as is, new in the box, or hook it up and pickle it?


Sent from my iPad using Cruisers Sailing Forum
Leave it in the box as new.
__________________
Jsta_Rebel is offline   Reply With Quote
Old 14-04-2016, 12:32   #20
Registered User

Join Date: Jun 2005
Posts: 253
Re: Watermaker output low??

Quote:
Originally Posted by nknowland View Post
Thank you for that confirmation. TDS is calibrated and working fine so I will replace membrane before heading out next season. So many posts say that people jump on the membrane when it's actually something else. One blog said they pickled their membrane for 6 years! Bah.... Easy enough repair to make. Thanks again for taking the time to reply.
No problem. Glad to help. Now if I could just get these two 120 GPM SWRO Trains on Anguilla back up and running , I'd be a happy man..
__________________
Jsta_Rebel is offline   Reply With Quote
Old 31-01-2017, 06:37   #21
Registered User

Join Date: Jun 2007
Location: Caribbean Islands
Boat: 48' Alu Cat
Posts: 118
Re: Watermaker output low??

I have just replaced the membrane on my Little Wonder ( Village Marine ) 200 GPD with a AMI M-S2538A Membrane. My TDS is 1670, came down from 2200 after running for 4 hours. PSI 780, water temp. 74 F output 8 Gal.
Everything appears to be normal, except to very high TDS.
I replaced twice all seals, still no difference.
I wrote to AMI, but still waiting for a reply.
Can anybody help?
__________________
Seman is offline   Reply With Quote
Old 31-01-2017, 09:36   #22
Registered User

Join Date: May 2014
Location: Caribbean
Boat: IT40 Motorsailer. 40'
Posts: 225
Re: Watermaker output low??

Quote:
Originally Posted by Seman View Post
I have just replaced the membrane on my Little Wonder ( Village Marine ) 200 GPD with a AMI M-S2538A Membrane. My TDS is 1670, came down from 2200 after running for 4 hours. PSI 780, water temp. 74 F output 8 Gal.
Everything appears to be normal, except to very high TDS.
I replaced twice all seals, still no difference.
I wrote to AMI, but still waiting for a reply.
Can anybody help?

When you say' "ALL SEALS", does this include the "O"rings inside of the end caps that seal up the membrane inside of the housing?? If your flows are all ok, I'd bet you have an end cap "O" ring pinched or rolled. Make sure and lubricate the "O" rings before assembling. Use Glycerin if possible which is available at any pharmacy. If all is ok "O" ring wise, I'd have to say that Applied Membranes who makes these membranes shipped you a lemon which can happen..

Below are this membrane's specs.

Specifications for M-S2538A

AMI Model Number
M-S2538A

Size (Approximate):
2.5" Dia. x 38"L
Flow Rate:
550 gpd (2.18 m/d)
Applied Pressure:
800 psig (55 bar)
Stabilized Salt Rejection:
99.6%
Minimize Salt Rejection:
99.4%
Single Element Recovery:
8%
Exterior:
Hard Shell Fiberglass
Membrane Type:

Polyamide Thin-Film
Composite

Permeate flow and salt rejection based on 32,000 ppm NaCl feed stream, pressure and recovery listed above. Element Permeate flow may vary +/- 20%


Operating Limits for M-S2538A

Maximum Operating Temperature:
113F (45C)
Maximum Operating Pressure:
1,000 psig (69 bar)
Maximum Pressure Drop:
15 psig (1 bar)
Maximum Feed Flow Rate:
6 gpm (1.4m/h)
pH Range, Continuous Operation:
2-11
pH Range, Short-Term Cleaning:
1-13
Maximum Feed Silt Density Index:
SDI 5
Free Chlorine Tolerance:
0
__________________
JstaRebel is offline   Reply With Quote
Old 31-01-2017, 09:52   #23
Registered User

Join Date: Jun 2007
Location: Caribbean Islands
Boat: 48' Alu Cat
Posts: 118
Re: Watermaker output low??

Thank you, for your reply and all the info, Rebel.
Yes, I did replace the 2 internal seals inside each of the end caps, last time with oversized o rings. Had a hard time fitting the membrane, but still no difference.
Unfortunately we are in the Caribbean. Just spend over $400 on this membrane!
I'm just out of ideas.
Cheers
__________________
Seman is offline   Reply With Quote
Old 31-01-2017, 12:47   #24
Registered User

Join Date: May 2014
Location: Caribbean
Boat: IT40 Motorsailer. 40'
Posts: 225
Re: Watermaker output low??

Oversized "O" rings may be your problem.. I sent you a PM asking for your location to see if I can get you a little help on this..
__________________
JstaRebel is offline   Reply With Quote
Old 31-01-2017, 13:48   #25
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jul 2005
Boat: Outbound 44
Posts: 4,561
Re: Watermaker output low??

Quote:
Originally Posted by Seman View Post
Thank you, for your reply and all the info, Rebel.
Yes, I did replace the 2 internal seals inside each of the end caps, last time with oversized o rings. Had a hard time fitting the membrane, but still no difference.
Unfortunately we are in the Caribbean. Just spend over $400 on this membrane!
I'm just out of ideas.
Cheers
Did you use a VM/Parker membrane or a standard one? I did the same thing a few years back. Went through 2 new membranes from CruiseRO on their advice. Turns out the VM membranes are low-flow membranes for the LW. The symptom I had was consistently high TDS. I replaced with a VM/Parker membrane and the TDS instantly came down to a good level, like 250.
__________________
Paul L
http://svjeorgia.blogspot.com
Paul L is offline   Reply With Quote
Old 31-01-2017, 16:52   #26
Sponsoring Vendor
 
Tellie's Avatar

Community Sponsor

Join Date: Oct 2007
Location: Hollywood, Fl.
Boat: FP Athena 38' Poerava
Posts: 3,045
Re: Watermaker output low??

Quote:
Originally Posted by Paul L View Post
Did you use a VM/Parker membrane or a standard one? I did the same thing a few years back. Went through 2 new membranes from CruiseRO on their advice. Turns out the VM membranes are low-flow membranes for the LW. The symptom I had was consistently high TDS. I replaced with a VM/Parker membrane and the TDS instantly came down to a good level, like 250.
Tellie is offline   Reply With Quote
Old 31-01-2017, 17:19   #27
Registered User

Join Date: Jun 2007
Location: Caribbean Islands
Boat: 48' Alu Cat
Posts: 118
Re: Watermaker output low??

Thanks Tellie,
but TDS 2000 from the AMI membrane instead of 200 for the Parker membrane?
The AMI suppose to be compatible? Can that be?
__________________
Seman is offline   Reply With Quote
Old 01-02-2017, 00:09   #28
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: Watermaker output low??

AMI rolls and glues their membranes by hand, Dow has a gazillion dollar automated membrane production facility where everything is done by precision machine. I've been to AMI and seen the membrane production and it's a damn miracle any of their membranes have consistency and reliability after the mess I saw in Vista Ca. We tested their 40" membranes as an alternative to the Dow SW30-2540 and cut the test short and ran away fast. You get what you pay for with a discount membrane.

So it could easily just be a bum membrane.
__________________
Rich Boren Goodbye Morro Bay...Hello La Paz, Mexico and the owner of:
Cruise RO Water High Output Water
Technautic CoolBlue Refrigeration
SV THIRD DAY is offline   Reply With Quote
Old 01-02-2017, 01:18   #29
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jul 2005
Boat: Outbound 44
Posts: 4,561
Re: Watermaker output low??

Quote:
Originally Posted by Seman View Post
Thanks Tellie,
but TDS 2000 from the AMI membrane instead of 200 for the Parker membrane?
The AMI suppose to be compatible? Can that be?
The Parker is a low flow membrane for the LW. As I mentioned above I had the same issue with the membranes sold by CruisrRO.
__________________
Paul L is offline   Reply With Quote
Old 02-02-2017, 06:42   #30
Registered User

Join Date: Jun 2007
Location: Caribbean Islands
Boat: 48' Alu Cat
Posts: 118
Re: Watermaker output low??

I have checked the HP pump output.
No load 0.57 US GPM, under load combined brine & perm. about 0.25 GPM.
Is this normal?
__________________

__________________
Seman 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 09:09.


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.