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Tool Talk Discussion Forum

A Hydraulic question:

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Dick

12-17-2003 23:34:31




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Is there a rule of thumb as to how large of tank is needed for a hydraulic application?
Example: A hyd. pump that pumps 15 gals. to run a hydraulic motor. Would you need a tank that would hold 5 gals. 20 gals. or what?

Thanks,
Dick




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Joe (Wa)

12-18-2003 10:57:24




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 Re: A Hydraulic question: in reply to Dick , 12-17-2003 23:34:31  
Dick, click on link and scroll down to Hydraulic reservoirs. Joe



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Heat Houser

12-18-2003 09:17:20




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 Re: A Hydraulic question: in reply to Dick , 12-17-2003 23:34:31  
Typically, you will want about 45 sec of dwell time minimum in the hydraulic tank to allow the oil to deaireate.(let the air bubbles out) 15 X .75 = 11.25 gallons of oil in the tank. The size of the tank will have to be bigger to allow for thermal expansion etc. Tank outlet (suction port) design is important to eliminate a vortex from forming and sucking air into the pump. Sufficient oil height above the suction will eliminate the vortex. Returning oil should enter below the tank's oil level to prevent air from being entrained. If the oil is allowed to simply fall back into the top of the tank it will carry air with it and your pump will fail due to the air bubbles imploding (collapsing) when they hit the pressure side of the pump. Imploding bubbles will chip out small bits of metal and over time, erode the surfaces.

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Paul Janke

12-18-2003 05:29:20




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 Re: A Hydraulic question: in reply to Dick , 12-17-2003 23:34:31  
On stationary equipment, they used to say two gallons for each GPM pumped. The two biggest things are to have enough capacity to fill all the cylinders which will be extended at the same time, and to have a system which will not overheat. I had about a five gallon reservoir on about a 25 GPM system, but I didn't have a lot of heat producing stuff and I had a cooler. A loader lowering a load puts the potential energy of the load in the air into the oil in the form of heat while lowering.

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Richard Fazio

12-18-2003 05:24:56




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 Re: A Hydraulic question: in reply to Dick , 12-17-2003 23:34:31  
You kind of answered your own question. When you say the pump, pumps 15 gallons, I think what you meant was 15 gallons per minute. A 15 GPM pump should have a tank of at least 15 gallons. This is what I've read. This is for normal hydraulics, cylinders and the like. With a hydraulic motor you may need more. Others with more knowledge will chime in.



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