Search found 239 matches

by groper
Wed Jan 20, 2016 8:34 am
Forum: Plumbing
Topic: Desalinator [moved from MV Catapult build]
Replies: 56
Views: 53408

Re: MV catapult

The pump and motor is probably the same as cruiseRO uses - its an american brand called "general pump" I got this from an image used on their website of the water flow circuit diagram of their system... it may only have been used for illustration purposes so may not be accurate - but it do...
by groper
Tue Jan 19, 2016 8:43 am
Forum: Plumbing
Topic: Desalinator [moved from MV Catapult build]
Replies: 56
Views: 53408

Re: MV catapult

Wow - These "h20 on the go" are the cheapest ready made watermakers ive seen...

Their larger model http://h2oonthego.com.au/60-100-LPH-Watermaker has about the same spec as the one we are building - so i guess we can expect 60L/ hour from ours..?

Good find chris, thanks mate :)
by groper
Sun Jan 17, 2016 10:38 pm
Forum: Plumbing
Topic: Desalinator [moved from MV Catapult build]
Replies: 56
Views: 53408

Re: MV catapult

No plans mate - we are designing the system and building them ourselves... All the parts are available in australia - however we have chosen to source some of the more expensive bits from the USA as saves quite a bit of money compared to local prices... The system consists of a saltwater lift pump -...
by groper
Sun Jan 17, 2016 11:25 am
Forum: Plumbing
Topic: Desalinator [moved from MV Catapult build]
Replies: 56
Views: 53408

Re: MV catapult

Good to hear mate, i was reading a paper by hydronautics and they showed the improvements to membrane technology over the years, the current membranes are significantly better than those of only 10 years ago... which membrane are you running now?
by groper
Sun Jan 17, 2016 8:39 am
Forum: Plumbing
Topic: Desalinator [moved from MV Catapult build]
Replies: 56
Views: 53408

Re: MV catapult

Thanks alan, As you can see from those specs, the max flow that pump will pass is between 0.25-0.48 gallons per minute - its very small. This is where they are saving energy, by moving a very small amount of seawater... The problem is, this flow rate is below the minimum recommended flow of 0.7 GPM ...
by groper
Sun Jan 17, 2016 12:03 am
Forum: Plumbing
Topic: Desalinator [moved from MV Catapult build]
Replies: 56
Views: 53408

Re: MV catapult

Ok ive got this sorted now - weve changed to smaller displacement CAT pumps - 2SF15SEEL - and gone to a higher speed 4 pole 750w motor. The rated load of this pump at 1460rpm is only ~500W and the available motor has an improved efficiency at this reduced load of around 83%. after converting the loa...
by groper
Fri Jan 15, 2016 5:25 pm
Forum: Plumbing
Topic: Desalinator [moved from MV Catapult build]
Replies: 56
Views: 53408

Re: MV catapult

I dont think its a s simple as that Alan... the permeate flow rates given by DOW on their membrane is onlt a data point at a specific test condition ie water temp, pressure, total flow rate, recovery rate = 8% etc... its not an indication of what you always get. Looking at the specs of the efficient...
by groper
Fri Jan 15, 2016 12:45 pm
Forum: Plumbing
Topic: Desalinator [moved from MV Catapult build]
Replies: 56
Views: 53408

Re: MV catapult

Hi Alan, The projected output is only a calculation based on the manufacturers fairly rudimentary formulas for output and horsepower etc... until its up and running we dont really know what it will produce or how much power it will consume - likely the power consumption will be less as i believe the...
by groper
Fri Jan 15, 2016 4:50 am
Forum: Plumbing
Topic: Desalinator [moved from MV Catapult build]
Replies: 56
Views: 53408

Desalinator [moved from MV Catapult build]

Ok time to talk about desalinators. Me and Dave (aka finally) are building our own. We have started acquiring all the parts and i will begin putting it together once it all arrives. I have a jabsco deckwash pump for washing down the cockpit, so i am going to feed the high pressure pump from it via 2...
by groper
Wed Jan 13, 2016 8:03 pm
Forum: Multi-hull Builds
Topic: MV catapult
Replies: 137
Views: 117010

Re: MV catapult

Hi kjay, The only equipment I run on 240VAC is the domestic fridge, domestic chest freezer, watermaker, scuba dive compressor, and general power outlets for whatever I want to plug in. These are all fed from either shore power when at the marina, or a 3kw inverter fed from the solar + engine alts ch...