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Author Topic: Thai upward siphon replication  (Read 417 times)

Offline Cherryman

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Thai upward siphon replication
« on: June 19, 2017, 09:10:59 PM »
Hi all. so i tried to replicate a Thai bush gadget, they use to elevate water only with gravity,speed and (negative ) pressure.


Thai pump in action: https://www.youtube.com/watch?v=I1bhPySQG9M


My first attempted failed, my barrel imploded. : (
Thats bad, but also promising, it takes a lot of force to implode a barrel.  I Had unfortunately to refill it standing to undo the dents.


Anyone knows the best way to strengthen the barrel?  I do not have a lit, only the two caps as openings.






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Thai upward siphon replication
« on: June 19, 2017, 09:10:59 PM »

Offline Low-Q

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Re: Thai upward siphon replication
« Reply #1 on: June 20, 2017, 03:47:05 PM »
Actually, it takes little effort to implode a barrel. The slightest vacuum will cause several kg pressure difference between inside and outside.
As an example, a small diesel pump was attached to a 50m^3 round diesel tank, made of steel. The tank imploded without the pump working harder. The cause was that the tank was not vented properly to let air go in as the diesel went out.
The surface of a barrel is approx 1.5m^2. That is 15 000 kg of pressure if you suck all the air out. A pressure of 0.99 bar, 0.01 bar below atmospheric pressure is 150 kg difference in total force acting on the walls of the barrel.
You need massive reinforcements to keep the barrel round even at very little vacuum.


Vidar


Offline Cherryman

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Re: Thai upward siphon replication
« Reply #2 on: June 20, 2017, 09:43:38 PM »
Actually, it takes little effort to implode a barrel. The slightest vacuum will cause several kg pressure difference between inside and outside.
As an example, a small diesel pump was attached to a 50m^3 round diesel tank, made of steel. The tank imploded without the pump working harder. The cause was that the tank was not vented properly to let air go in as the diesel went out.
The surface of a barrel is approx 1.5m^2. That is 15 000 kg of pressure if you suck all the air out. A pressure of 0.99 bar, 0.01 bar below atmospheric pressure is 150 kg difference in total force acting on the walls of the barrel.
You need massive reinforcements to keep the barrel round even at very little vacuum.


Vidar


Tnx Vidar, I will take that on board.

 

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