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Author Topic: broomwade compressor  (Read 1414 times)

hopeitfloats

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broomwade compressor
« on: May 03, 2013, 07:56:23 AM »

hi guys. could someone  please tell me the cu ft capacity of an old  twin cylinder broomwade compressor able to produce 150psi.  2'' bore and 2'' stroke running at 750rpm and to really push my luck approximate hp required to drive.
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catengineman

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Re: broomwade compressor
« Reply #1 on: May 03, 2013, 01:41:35 PM »

is there a plate on the side of the compressor to denote build type ?
running is not such a big problem but it will be the start up where you will need the humph
has it got an unloader valve, has it got a differential pressure switch.
I take it your thinking on electric power and not an engine to drive it.


the 2" bore & stroke would probably need around 5 HP run but would need either soft start or a larger HP to guard against starting up loading.
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hopeitfloats

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Re: broomwade compressor
« Reply #2 on: May 03, 2013, 01:50:46 PM »

hi. the only details on it were what i put in the description. looks to be a fairly old model. cast iron. looking to power with electric but not sure if it would have enough capacity to run a 40 amp plasma cutter.
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catengineman

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Re: broomwade compressor
« Reply #3 on: May 03, 2013, 07:07:49 PM »

Do you have a receiver for the air?


Running at 750 rpm you would probably only make 1.5 or 2 CFM (this is a best guess)
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NickelBelter

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Re: broomwade compressor
« Reply #4 on: May 14, 2013, 01:03:04 AM »

Assuming it's single-stage:


Each cylinder has a volume of 3.14x 1(squared) x 2 inches = 6.28 cubic inches


There are two cylinders so it is delivering twice that volume  = 12.56 cubic inches per stroke


At 750RPM that's 750 strokes/minute or 9420 cubic inches per minute, which converts to about 5.45 CFM



Hope I've done that correctly, it's been a while since thermodynamics.  Couldn't figure out power needed, got 645W which seems awfully low. 


EDIT:  Just read that an average single-stage compressor delivers 3CFM per HP at 100psi, so to deliver 5 CFM at 150 PSI would take at least two and a half or three horsepower
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I'm interested in tiny versions of regular size things.
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