Cruisers Forum
 


Join CruisersForum Today

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 25-11-2016, 16:05   #1
Registered User

Join Date: May 2011
Boat: 50' catamaran
Posts: 433
Watermaker - Cat pump output

I'm looking at building a new water maker and I am looking at the Cat 3CP1221 high pressure pump. The water maker will be be direct connected to a 2.9 HP single phase 220 volt 50/60hz electrical motor.

This pump is rated at 4.2 gallons per minute - but that will surely not be the output of fresh desalinated water. I know that the production of fresh water is also influenced by the intake water temperature. The electrical motor will also run about 20% faster on 60hz than on 50hz - thus producing more freshwater.

I have some questions;

1. To reduce a large number of membranes, I am keen on 8" x 40" membranes. But how many of these would I need?

2. Operating at 50 hz and 80 bar, can anybody give me a clue (more or less) how much fresh water we can expect this pump to produce?
Attached Files
File Type: pdf Cat Pump 3CP1221 - SS (2).pdf (469.3 KB, 40 views)
__________________

__________________
https://www.svrevelations.com
Revelations is offline   Reply With Quote
Old 25-11-2016, 17:05   #2
Registered User

Join Date: Mar 2014
Posts: 81
Watermaker - Cat pump output

Your pump is too small for 8 inch units and just adequate for a 4 inch membraine, you should get over 200 l/hour at 800psi, a 4 inch membraine can produce around 300l/ hour but don't think your pump output is enough for that.
4 inch membraines have a max of 69 bar but 60 ish bar is adequate. Your pump hp looks ok for the stated output.
You will need lots of generator to start a 2.9 hp single phase motor.
8 inch units can produce around 1200l/hour which is similar to your pump output so that isn't happening!

Regards ab




Sent from my iPad using Cruisers Sailing Forum
__________________

Abgreenbank is offline   Reply With Quote
Old 26-11-2016, 03:03   #3
Registered User

Join Date: May 2011
Boat: 50' catamaran
Posts: 433
Re: Watermaker - Cat pump output

Quote:
Originally Posted by Abgreenbank View Post
Your pump is too small for 8 inch units and just adequate for a .......................... that isn't happening! Regards ab
Thank you for your response - much appreciated!
It will probably be easier to buy a ready made unit, but it is far more satisfying to build our own unit.

We have a 13 KVA 220 volt 50hz single phase generator on board.
I'm looking to maximize our fresh water making capacity - but do not have all the answers.
__________________
https://www.svrevelations.com
Revelations is offline   Reply With Quote
Old 26-11-2016, 03:14   #4
Registered User

Join Date: Mar 2014
Posts: 81
Re: Watermaker - Cat pump output

its not difficult to make your own but look at:

Cruise RO Water & Power: Watermakers for Boats & Yachts

its difficult to make your own cheaper and Rich has ironed out most of the problems

regards

Ab
Abgreenbank is offline   Reply With Quote
Old 22-12-2016, 01:32   #5
Registered User
 
Oceanride007's Avatar

Join Date: Jun 2013
Location: Gladstone Qld.
Boat: Custom Perry Passport 41, steel
Posts: 455
Re: Watermaker - Cat pump output

If you intend running a 50Hz motor at 60Hz, yes you will pump more. But unless the name plate says you can (not likely), I'd expect it too start smoking sooner or later. Apoligies if I have mistaken your intent.
Oceanride007 is offline   Reply With Quote
Reply

Tags
water, watermaker

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
Watermaker output low?? stevensuf Plumbing Systems and Fixtures 38 21-11-2018 08:05
Watermaker output ratings Hoghead Plumbing Systems and Fixtures 0 25-10-2015 23:19
Want To Buy: High Output Watermaker SkyMaverick Classifieds Archive 6 07-06-2015 18:22
Watermaker output vs water temperature? twistedtree Plumbing Systems and Fixtures 7 30-07-2012 09:53
Watermaker Membrane - Change to Larger = Increased Output? quartersplash Plumbing Systems and Fixtures 41 23-03-2012 18:16

Advertise Here


All times are GMT -7. The time now is 02:01.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.