Seawater desalination

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rainbow
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Re: Seawater desalination

Post by rainbow » Wed Aug 23, 2017 8:47 am

JimC wrote:
mistermack wrote:
laklak wrote:I want a reverse osmosis water maker for the boat, but they're pretty expensive. Around $4,000 for a 20 gph setup. The best ones drive the pump directly from the diesel engine rather than using an electric pump, you need pressures in the range of 800 psi for ocean water.
How the hell do you use 20 gallons per hour on a boat?
You might only have it on for 2 hours, and use it to replenish your freshwater tank.
Silly because as I said, the membranes work better at constant pressure. Use the electric pump and keep it going all the time.
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Re: Seawater desalination

Post by mistermack » Wed Aug 23, 2017 9:11 am

laklak wrote:Flushing toilets, showers, fresh water for flushing the dinghy outboard, cooking, washing clothes (soon, I'm putting in a combo washer/dryer next summer) - same stuff you use water for on land. The water tank is 140 gallons, we can get a week out of that when not at a dock if we're careful and ration it. 20 gph is about the smallest water maker produced, there are smaller "survival" units for life rafts but they're manually operated and aren't designed for long term use. A couple of hours a day and we'd have all the water we need and wouldn't have to come back into port for weeks on end. Well, as long as we pump the shit overboard, and you're supposed to be 9 miles out to do that. Never mind one manatee shits more in an afternoon than I do in a week.
It's all luxury use of water really. You can flush the toilet with a bucket of seawater, (or use the bucket), clothes could pile up till you dock, you could row the dinghy and showering doesn't really come into it, if you're only away for a couple of weeks.

But why the fuck you would want to be at sea for more than an hour has me mystified.
An hour in my Kayak and I've had my fill.

When I was twenty, I travelled to Quebec from Liverpool on a cruise liner. I was going mental after a day.
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Re: Seawater desalination

Post by laklak » Wed Aug 23, 2017 1:58 pm

It's true that I'm all about luxury. I'm a princess.
Yeah well that's just, like, your opinion, man.

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Re: Seawater desalination

Post by Forty Two » Wed Aug 23, 2017 2:32 pm

...and your personal pronoun is "Your heineyness."
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Re: Seawater desalination

Post by mistermack » Wed Aug 23, 2017 2:59 pm

laklak wrote:It's true that I'm all about luxury. I'm a princess.
You must be running drugs. The chance of a big payoff is the only thing that would keep me at sea for days.
While there is a market for shit, there will be assholes to supply it.

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Re: Seawater desalination

Post by JimC » Wed Aug 23, 2017 8:56 pm

mistermack wrote:
laklak wrote:It's true that I'm all about luxury. I'm a princess.
You must be running drugs. The chance of a big payoff is the only thing that would keep me at sea for days.
He's clever, though. He carries them in his bloodstream...
Nurse, where the fuck's my cardigan?
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Re: Seawater desalination

Post by laklak » Thu Aug 24, 2017 1:16 am

Guns to Columbia, cocaine to Miami. It's a win-win.

Actually, I'm thinking toilet paper to Venezuela might be a real money tree. Toilet paper down, underage hookers back up.
Yeah well that's just, like, your opinion, man.

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Re: Seawater desalination

Post by mistermack » Thu Aug 24, 2017 2:05 pm

Is it safe to drink the water out of your tank, or do you need to boil it?
I get my drinking water from a spring, I fill up 35 gallons at a time, and it lasts for months and months. But I always boil it before drinking.

On the subject of water, a friend of mine nearly died from legionnaires disease. It was never identified where he got it from, there was no outbreak at the time in Gloucester.

He was telling me later that he and a friend were pressure washing vehicles, not directly off the mains water, and I think that's how he got it. ( I can't remember exactly what setup he was using, but I thought at the time, there may have been stale water in the pipe) You only need to breathe in a few bacteria to catch it, so I'd be a bit nervous of showering in non mains water.
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Re: Seawater desalination

Post by laklak » Thu Aug 24, 2017 2:30 pm

No, we don't drink the water from the tank, which would be another advantage of a water maker. Save me lugging gallons of drinking water on board. We do chlorinate it, though, so showering shouldn't be an issue.

But then again I rarely drink water. Fish fuck in it.
Yeah well that's just, like, your opinion, man.

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Re: Seawater desalination

Post by mistermack » Thu Aug 24, 2017 3:34 pm

laklak wrote: But then again I rarely drink water. Fish fuck in it.
Oh yes you do. :prof:

Of course, it may be mixed with something else.
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Re: Seawater desalination

Post by JimC » Thu Aug 24, 2017 8:53 pm

We have water tanks, which we use for the garden and for flushing the toilet, which is more than half our overall water use. We don't use it for drinking.
Nurse, where the fuck's my cardigan?
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Re: Seawater desalination

Post by mistermack » Sat Aug 26, 2017 2:50 am

There are actually very few things that you can drink that won't kill you, that don't contain water as the main ingredient.
Alcohol is one of the few. Pure alcohol won't kill you, (unless you drink too much) but it would burn like fuck.

I think there are just one or two totally inert substances that you could drink and survive, that would pass straight through.
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Re: Seawater desalination

Post by laklak » Sat Aug 26, 2017 3:43 am

That is exactly what I tell MRs. Lak when she says "It's only 8 am, and you're drinking a beer?".
Yeah well that's just, like, your opinion, man.

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Re: Seawater desalination

Post by Tyrannical » Sat Aug 26, 2017 10:48 am

Desalination is pointless outside of cities, because you'll never be able to desalinate cheaply enough to grow food too. These water poor overpopulated regions are just setting themselves up for a massive future famine.
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Re: Seawater desalination

Post by rainbow » Sat Aug 26, 2017 11:01 am

Drivel.
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