Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 14-01-2021, 10:58   #1
Registered User

Join Date: Feb 2008
Posts: 178
Dessalator D60 DC only producing 20L or less, and bubbles in capacity flow meter

I just got my boat with a D60 watermaker.

For anyone who has this unit, is it normal for the occasional air-bubble to pass through the production meter?

I'm only seeing 20L of water production, and it drops off below that on occasion. I know I should expect 60L but in earlier tests i thought I was seeing at least 40.

I did just change the 5 micron filter (with a generic one) and as I said I believe was getting better production rate before that. I thought I had a good seal but was wondering if other owners have experienced similar and have any trouble shooting tips on low production.
sgtPluck is offline   Reply With Quote
Old 14-01-2021, 18:27   #2
Registered User
 
fxykty's Avatar

Join Date: Apr 2016
Location: Auckland
Boat: Outremer 55L
Posts: 2,140
Re: Dessalator D60 DC only producing 20L or less, and bubbles in capacity flow meter

We have the same water maker, now 17 years old. Our previous owner disconnected the control panel and we only use it for on/off switch and pressure adjustment. The flow meter is also disconnected.

You may have an air leak in the measurement hose - check your hp hose connections and all hoses.

How clean are your membranes? We recently pulled both membranes and gave them a good rinse and soft scrub.

Measure your output via the waste hose: time filling a container for one minute and work out your output. Or, as we do, monitor your tank gauge for how quickly it fills. With original membranes, 20 degree C water, clean pre-filter and good battery voltage we’re getting 55-60 litres per hour.
fxykty is offline   Reply With Quote
Old 14-01-2021, 18:31   #3
Registered User

Join Date: Dec 2020
Posts: 227
Re: Dessalator D60 DC only producing 20L or less, and bubbles in capacity flow meter

Quote:
Originally Posted by fxykty View Post

How clean are your membranes? We recently pulled both membranes and gave them a good rinse and soft scrub.
FYI: This is a worthless exercise. The membranes are actually spiral wound, and all the active surface is internal and can not be seen or cleaned by “rinsing and wiping”. All you are doing is cleaning the external shell of the membrane housing!
BillKny is offline   Reply With Quote
Old 14-01-2021, 18:44   #4
Registered User
 
fxykty's Avatar

Join Date: Apr 2016
Location: Auckland
Boat: Outremer 55L
Posts: 2,140
Re: Dessalator D60 DC only producing 20L or less, and bubbles in capacity flow meter

Quote:
Originally Posted by BillKny View Post
FYI: This is a worthless exercise. The membranes are actually spiral wound, and all the active surface is internal and can not be seen or cleaned by “rinsing and wiping”. All you are doing is cleaning the external shell of the membrane housing!

We flushed them through both ends, so got their insides too. But the outside of the membranes (not the housing, doh) should be clean too - if they sit for a while they can get gunked up.
fxykty is offline   Reply With Quote
Old 14-01-2021, 19:48   #5
Registered User

Join Date: Mar 2014
Location: Oz
Posts: 1,028
Re: Dessalator D60 DC only producing 20L or less, and bubbles in capacity flow meter

Sea water inlet may be clogged/ restricted, barnacles/plastic bag etc, (we found a small dead eel in our generator inlet once). The air bubble may be an indication of a tiny leak in the high pressure hose connector at the back of the display panel, usually accompanied by salt or corrosion build up. The 5 micron filter may not be suitable type or has swallowed a pile of mud/sand eg if running the WM when pulling up the anchor, or small seaweed, check your engine water filters too if this has happened.
Bean Counter is offline   Reply With Quote
Old 15-01-2021, 14:28   #6
Registered User
 
cajucito's Avatar

Join Date: Oct 2012
Location: Tipperary & Dublin Ireland
Boat: Beneteau 44cc
Posts: 86
Re: Dessalator D60 DC only producing 20L or less, and bubbles in capacity flow meter

the first problem I had with my dessalator was when it was over 10 years old. The service center called me back about 15 minutes after I called them and spent almost an hour on the phone at their cost until issues were resolved. They provided the best service I have ever got from any boat equipment supplier... ever ... so call them you will be pleasantly surprised by how helpful they are.
cajucito is offline   Reply With Quote
Old 15-01-2021, 14:31   #7
Registered User

Join Date: Jan 2013
Location: Vava'u - Tonga
Boat: Le Guen Hemidy, Croix-du-Sud, 56'
Posts: 97
Re: Dessalator D60 DC only producing 20L or less, and bubbles in capacity flow meter

It's normal to have some bubbles passing trough flow meter wenn you start the watermaker. Wenn not working, some gas is produced by the dead micro-organisme decomposition.
If you still have bubble, for sure you have an air leak. In my case it was the big O-Ring on top of the raw water filter, it looks fine but didn't do it's job no more. At the same time check all connections and check free flow to the filter. If clogged or reduced system will begin to suck air through a weak point.
Good luck.
CdS2 Roland is offline   Reply With Quote
Old 15-01-2021, 16:10   #8
kcj
Registered User

Join Date: May 2012
Boat: Lagoon 470, ex corsair f31
Posts: 178
Re: Dessalator D60 DC only producing 20L or less, and bubbles in capacity flow meter

Have a now modified d60...

What is the ppm of the output? If not lt300 membranes may be suspect...

Is pump getting up to full pressure? Eg 800psi...or green zone on gauge... if not pump seals and or valves may need a rebuild...

More importantly what is the water flow into pump and out of membranes ? This can be measured with no back pressure on membranes...with less than ideal voltage and amps the dc motor won't spin fast enough to provide necessary rpm to pump
...pump spins slower, provides lower gpm, therefore lower output

Ymmv
Good luck
Cheers
kcj is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Dessalator d60 alarm light Swift Drift Plumbing Systems and Fixtures 8 19-11-2018 16:13
Dessalator D60 Watermaker Cruisin Cat Plumbing Systems and Fixtures 15 13-10-2016 15:01
How Long Should the WaterMaker Run Before it Cuts Out - Dessalator D60 monte Plumbing Systems and Fixtures 17 19-06-2013 02:50
Dessalator D60 Question.. monte Plumbing Systems and Fixtures 4 08-07-2012 07:19
convert a 20l outboard fuel tank to inboard ewanfish Engines and Propulsion Systems 0 04-07-2011 05:52

Advertise Here


All times are GMT -7. The time now is 04:21.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.