Make sure that you have sufficient air vents topside to allow the displaced air to escape with minimal (preferably 0) back pressure in the tank.
If you can provide vacuum assisted air evacuation, you are effectively adding head pressure to the fill hoses. You could also draw some vacuum in the tank using the engine to suck the tank down on it's back trip to be refilled.
Either method would be great to increase flow on gravity fed water (water tower)sources. A check valve would be required, and a method of opening the top vents once pressure == 0PSI/KPA
This would add some costs and operator complexity however.
If you use my idea, a trip Down Under to christen serial #1 with a case of Sheaf Stout and an OZ patent plaque with my name on it would be appreciated :D
The fill point is just an open hole the water falls through. The driver parks underneath and hits the remote R/C button to open the valve, and waits for the fill to stop. we can't trust the driver to do anything more complicated than that (ie anything that isn't driving, or button pressing.)
I am no engineer. :) But, when I first read about this, I thought of something involving an air tank at the top, and a refill point more toward the bottom. You would have to fill the reservoir under pressure (or else pressurize the air tanks after fill), but the extra air pressure from above would tend to force the water out faster.
I still like my 50 m tower idea containing exactly 200K litres and a trapdoor valve. Might be an issue with snapping the truck or popping the tires, and utterly impractical.
What about a hopper, 2 m square outlet, 10m square, 5m high.
Excellent! Then you wouldn't need the huge tanker, just a light truck with the sprays plumbed directly into the receiving point. Just beam the water directly from the tank supply.
For those who are metrically impaired the water tank is 18'8" wide, 24'4" long, 14'high. 454 cuft of water - 3400 gallons - 28,211 pounds. That's a fill rate of 340 gpm. (I THINK I got my numbers right)
Awww, don't you want to cut it down to one? If you build a tank over the truck and have a tank with about twice that volume of compressed air you can fire the water down into the tanker. Poor sod if he didn't line the fill hole up. The time can be spent the extra minutes to reload. Of course there should be flashing lights and a horn since without the truck you might kill stray pedestrians.
I think with that setup we'd have to rebuild the fill-point after each fill. 200 tonnes of water traveling at near-supersonic speeds would crater the truck.
It's extra if they want the truck redesigned. :-) It's fast but not supersonic and the load isn't all at once so it's much like loading rock and likely where they borrowed their time-to-fill number. Funny as it might sound the air over water method doesn't have the water hammer problem. It is noisy and requires regeneration time though.
Let's see if they would allow a 24" pipe (looks to be a 30" opening) it's under 7 ft/sec. A 16" pipe would be just over 15.3 ft/sec or about when the force on bends and the jet reaction start to be fun. I'm assuming a 2000 lb ton, 62.4 lbs/cu ft water, and about five minutes. That the whole thing has to start from rest would have to be added and the numbers recalculated but speeds under 40 ft/sec make this very possible. Head... not a problem, rather low actually, well within gravity feed. Head = Vel^2/2*g ignoring friction. I'd bet I could do it under 3 minutes without breaking the truck.
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beer?
now that would be nifty.
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Some TV show has got to want to do this.
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Okay, okay I know, I'll stop:D.
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If you can provide vacuum assisted air evacuation, you are effectively adding head pressure to the fill hoses. You could also draw some vacuum in the tank using the engine to suck the tank down on it's back trip to be refilled.
Either method would be great to increase flow on gravity fed water (water tower)sources. A check valve would be required, and a method of opening the top vents once pressure == 0PSI/KPA
This would add some costs and operator complexity however.
If you use my idea, a trip Down Under to christen serial #1 with a case of Sheaf Stout and an OZ patent plaque with my name on it would be appreciated :D
CYa!
Mako
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Stout is still on offer.
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Or increase the number of feed pipes. Not a whole lot of flexibility here I'm afraid...
Mmms, Sheaf is tied for the best stout on the planet IMHO, the other being Anchor Stout (out of San Francisco).
CYa!
Mako
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Now, that could be an utterly useless idea, too.
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What about a hopper, 2 m square outlet, 10m square, 5m high.
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That's a REALLY neat toy!
For those who are metrically impaired the water tank is 18'8" wide, 24'4" long, 14'high. 454 cuft of water - 3400 gallons - 28,211 pounds. That's a fill rate of 340 gpm. (I THINK I got my numbers right)
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If you build a tank over the truck and have a tank with about twice that volume of compressed air you can fire the water down into the tanker. Poor sod if he didn't line the fill hole up. The time can be spent the extra minutes to reload. Of course there should be flashing lights and a horn since without the truck you might kill stray pedestrians.
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Let's see if they would allow a 24" pipe (looks to be a 30" opening) it's under 7 ft/sec. A 16" pipe would be just over 15.3 ft/sec or about when the force on bends and the jet reaction start to be fun. I'm assuming a 2000 lb ton, 62.4 lbs/cu ft water, and about five minutes. That the whole thing has to start from rest would have to be added and the numbers recalculated but speeds under 40 ft/sec make this very possible. Head... not a problem, rather low actually, well within gravity feed. Head = Vel^2/2*g ignoring friction. I'd bet I could do it under 3 minutes without breaking the truck.
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