Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 18-08-2011, 19:14   #1
Registered User

Join Date: Jun 2008
Location: www.peterpowell.ca
Posts: 128
Need Help with High-Pressure Line for Watermaker

Hi folks:
Need advice on what type of hose to use from the high pressure (engine-driven) pump to the membrane housing. That is, carrying the sea water, under about 800psi, to the membrane.
I have burst two hoses already in the past 2 years, due to vibration/chafing on metal bulkhead caused by the pulsing set up with the high pressure pump. I think I've corrected the chafe issue.
When I arrived here in the Philippines I had some new hoses and fittings made up but they are for hydraulic fluid. I've read elsewhere in this forum that hydraulic hoses are not well-suited for this purpose (taste?) but I have this to add: I replaced a short section of hose (1 foot) running from the sea water strainer intake to the first-in-line filter housing with a chunk of hydraulic hose that I picked up in Chile. After about 6 months first filter (20 mic?) was filthy black and the 2nd ( 5mic) filter looked ok. The only reason I can think of for this black crap is that the short section of hydraulic hose is shedding particles (a sea water problem?). This worries me and I will change that 1 foot section and it further worries me that my new hydraulic hose (not yet installed) from high pressure pump to membrane would be worse disaster, fouling the membranes in short order.
So, back to original question: what is accepted standard for hose from high pressure pump to membrane (and from membrane to control panel)?
I looked at the Parker hose site but the choices are almost limitless and I am not an engineer.
Thanks for any help.
Pete
__________________

__________________
rigormortis is offline   Reply With Quote
Old 18-08-2011, 21:56   #2
Sponsoring Vendor
 
Tellie's Avatar

Community Sponsor

Join Date: Oct 2007
Location: Hollywood, Fl.
Boat: FP Athena 38' Poerava
Posts: 3,046
Re: Need Help with High-Pressure Line for Watermaker

Parker is a good source for hoses that are potable quality and should easily handle the pressures generated by a (ugh) engine driven high pressure pump. That's an easy fix. But Are you saying you did not change out your pre-filters for six months?
Tellie is offline   Reply With Quote
Old 19-08-2011, 00:14   #3
Registered User

Join Date: Jun 2008
Location: www.peterpowell.ca
Posts: 128
Re: Need Help with High-Pressure Line for Watermaker

Hi Tellie:
Thanks for the reply. I did go to the Parker site but it is confusing in that there are so many types of hose available.
Yes, I did not change my paper filters between Chile and A. Samoa (7 months) but they looked ok when I did. When I changed again in Philippines (6 months) the first filter was black. Second one looked normal to the eye. The only thing I can attribute the black stuff to is the chunk of hydraulic hose (1') I had placed upstream of the filters.
I am singlehanding and make water once per week, at best. The boat is new to me (3 years) and the watermaker came with the boat (no instructions, however). I am expecting grief from you for not changing my prefilters more often. Be gentle.
Pete
__________________
rigormortis is offline   Reply With Quote
Old 19-08-2011, 01:34   #4
Registered User
 
Nauticatarcher's Avatar

Join Date: Jun 2007
Location: Mooloolaba, Qld
Boat: Islander Freeport 36
Posts: 396
Re: Need Help with High-Pressure Line for Watermaker

Aircraft grade hydraulic hose is what I used, but also Know of people who have used normal hydraulic hose with no problems, certainly a lot cheaper and you can always carry some extra and use field fittings on ends and you can change yourself if you need to. Black filter was probably just because you didnt change it, use washable pleated filters and you will get a lot longer out of them
__________________
Nauticatarcher is offline   Reply With Quote
Old 19-08-2011, 07:30   #5
Sponsoring Vendor
 
Tellie's Avatar

Community Sponsor

Join Date: Oct 2007
Location: Hollywood, Fl.
Boat: FP Athena 38' Poerava
Posts: 3,046
Smile Re: Need Help with High-Pressure Line for Watermaker

Quote:
Originally Posted by rigormortis View Post
Hi Tellie:
Thanks for the reply. I did go to the Parker site but it is confusing in that there are so many types of hose available.
Yes, I did not change my paper filters between Chile and A. Samoa (7 months) but they looked ok when I did. When I changed again in Philippines (6 months) the first filter was black. Second one looked normal to the eye. The only thing I can attribute the black stuff to is the chunk of hydraulic hose (1') I had placed upstream of the filters.
I am singlehanding and make water once per week, at best. The boat is new to me (3 years) and the watermaker came with the boat (no instructions, however). I am expecting grief from you for not changing my prefilters more often. Be gentle.
Pete

Grief? Why I'm the nicest old bastard here!
Yeah, you definatly left the pre-filters in too long. But I understand not having the manual for your unit and learning the system by trial and error. You're not the first. A black pre-filter is almost always biological growth. The first one in line will usually turn black first. By the time it is totally black it is shot. So throw it away and start with new filters. In warmer climates biological growth happens quickly. If you are only using your watermaker once a week I'd suggest you check your pre-filters at least every two weeks and give them a gentle cleaning. That fact that you have an engine mounted high pressure pump could mean several things. The first is that the chances are good that when you fresh water flush your unit the pre-filters do not get flushed with fresh water, which means they will get fouled a lot faster, especially if salt water sits still in the housings for a week. Also I'm concerned that if you haven't changed out your pre-filters in six months have you changed out your charcoal filter?
The hose is another matter. Just give Parker a call and tell them you need high pressure hose that is suitable for drinking water around the 2000psi range. You'll of course need the measurements of the fittings attached to the pump and membrane vessel. If you are experiancing chafe and vibration problems it sounds like your 12' hose is too short. I'd suggest a longer hose coiled one wrap. This should give you the clearance from the bulk head and not stress the hose or fittings.
Tellie is offline   Reply With Quote
Old 19-08-2011, 20:00   #6
Registered User

Join Date: Jun 2008
Location: www.peterpowell.ca
Posts: 128
Re: Need Help with High-Pressure Line for Watermaker

Tellie:
Thanks for the info. Maybe the black in filter #1 was only biological and not hydraulic hose problem. That is encouraging.
You also mention charcoal filter. I don't have one, pretty sure. You talking about a filter in the system just ahead of the taps, to help with drinking water?
Am hauled out now in the Philippines so I may install one.
Thanks,
Pete
__________________
rigormortis is offline   Reply With Quote
Old 19-08-2011, 22:49   #7
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: Need Help with High-Pressure Line for Watermaker

An Aussie having the same problem in this threads> Watermaker High Pressure Hose Length ?

Check it out!
__________________

__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Capilano Hydraulic Helm - Ball-and-Spring Pressure Release System plottie Engines and Propulsion Systems 9 02-05-2015 06:11
Send Over-Pressure Shore Water Over the Side with Pressure Valve ? sdowney717 Plumbing Systems and Fixtures 4 15-08-2011 19:36
Replacing Copper Fuel Line, and Other Issues kazenza Engines and Propulsion Systems 9 17-07-2011 11:41
Head Odors Sailagain Plumbing Systems and Fixtures 19 15-07-2011 11:06
Racor Fuel Filter Pressure Ajfowlie Engines and Propulsion Systems 13 15-07-2011 08:48



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 21:27.


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.