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Discussion Forum

Do you know the formula?

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ironhead

01-04-2001 08:15:41




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Hi, I have a compressor that was put together from several others by an oldtimer thats no longer with us. The pump is a curtis 2 stage, 4 1/2" & 2 5/16 bore with a 16.5"pulley The moter runs at 1770 rpm, has a 6.25" dia. pulley. How fast is the pump turning? The factory plate on the pump says to run at least 400 rpm. but says nothing about an upper limit. Could I increase the speed of pump without doing harm? It pumps up to about 240 lbs but takes a long time to get there. Thanks for any help.... j

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BlueLight

01-05-2001 14:11:39




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 Re: Do you know the formula? in reply to ironhead, 01-04-2001 08:15:41  
Good Ole' Massey Harris Manual circa 1951
and I quote for what it's worth:

"To determine the size of driven pulley
, to obtain a required speed of a driven shaft:

Multiply diameter of driving pulley by
number of revolutions per minute and divide by
desired speed of driven shaft in rev per minute"



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ironhead: Thanks

01-05-2001 05:42:55




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 Re: Do you know the formula? in reply to ironhead, 01-04-2001 08:15:41  
Thanks for the replies. Nope, not a typo, it does go to 240, but when metered out through a regulater it lasts much longer before the pump kicks on again, and the volume stays up for my air tools without having to stop and wait for it to catch up. I guess I am just impatient for it to fill the first time in the day. The tank is 150 gal (aprox) from a locomotive and has 3/8" thick walls, I'm not worried about launching it. ;^) thanks again...j

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Jim K

01-04-2001 16:16:45




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 Re: Do you know the formula? in reply to ironhead, 01-04-2001 08:15:41  
Iron head is the 240lbs a typo or are you trying to launch your air tank to the moon.
Jim K



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Greg S

01-04-2001 09:08:04




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 Re: Do you know the formula? in reply to ironhead, 01-04-2001 08:15:41  
16.5"/6.25" = 2.64 1770 rpm/2.64 = 670rpm pump speed



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T_Bone

01-04-2001 09:55:22




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 Re: Re: Do you know the formula? in reply to Greg S, 01-04-2001 09:08:04  
Hi ironhead, and at that rpm I would take a amp measurement to be sure it's with-in the maxmium amps of the motor found on the motor ID plate. You don't want to over load the motor.

T_Bone



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Old Sparky

01-08-2001 18:23:47




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 Re: Re: Re: Do you know the formula? in reply to T_Bone, 01-04-2001 09:55:22  
T Bone is right. Check the amperage draw. I suggest that the maximum pressure be kept to 175 PSI max. Too much heat at higher pressures, plus more chance of blowing something up. If you go for 175PSI, check the amperage at about 165 PSI. If nameplate max amps occurs there, the brief overload will not hurt and you will get maximum efficiency at most pressures. Motor load goes up as pressure rises.

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ironhead

01-09-2001 07:43:04




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 Re: Re: Re: Re: Do you know the formula? in reply to Old Sparky, 01-08-2001 18:23:47  
thanks Old Sparky, I'll do that as soon as I get my multimeter fixed. The fellow that used to own this ran it this way for years without any trouble that I know of and I always figured he knew what he was doing, but I want it to last me for a lot of years too.



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