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Hydraulic Calcs Question
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Posted by: pulinmyharout

01/29/2004, 16:49:54

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Does anybody know how to calculate how much psi a hydraulic pump will put out when driven by a 30 hp engine running at 3600 rpm?






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Re: Hydraulic Calcs
Re: Hydraulic Calcs -- pulinmyharout Post Reply Top of thread Forum
Posted by: maytag

02/03/2004, 21:38:08

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formula for hp=psi*gpm/1714*pump efficiency-you may not know what type pump you have-most gear pumps are 80-85% eff.-piston pumps will be 90-95 % eff.

although most cylinder calculations will be in terms of force you can use this formula here for cylinder hp by taking bore,stroke and rod size and cylce time all into consideration-hope this helps maytag







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Re: Hydraulic Calcs
Re: Hydraulic Calcs -- pulinmyharout Post Reply Top of thread Forum
Posted by: hnic

01/29/2004, 17:11:59

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A hyd. pump does not create pressure, only flow. The pressure is the resistance to flow and can vary from zero to rating on the pump. The only reason they give pressure ratings on pumps is that is the amount of pressure before pump breaks. You can get hand pumps that will provide 10000 psi. but it has very little flow.






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Re: Hydraulic Calcs Smile
Re: Re: Hydraulic Calcs -- hnic Post Reply Top of thread Forum
Posted by: pulinmyharout

01/29/2004, 19:11:15

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Thanx for the reply. I understand that pumps only convert mechanical power to fluid power. Let me re-phrase the question. How do you convert HP to psi? (we're trying to design a backhoe arm as an accessory to a farm tractor via 3-point hitch and  PTO)






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Re: Hydraulic Calcs
Re: Re: Hydraulic Calcs -- pulinmyharout Post Reply Top of thread Forum
Posted by: RandyKimball
Barney
01/29/2004, 19:33:00

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However a given pump with a given HP motor is rated at what psi that motor can deliver with that pump without stalling. These figures can be found in most hydraulic supply company catalogs in the back in relation to their products. .... example a smaller displacement pump will deliver more psi than a larger pump given the same motor. Also the gpm's are charted for you in the same place.
-randy-



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