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Re: air pump

Posted By: John Dragun
Date: Friday, 5 September 2014, at 1:33 a.m.

In Response To: Re: air pump (George Vidas)


I am running propane.......so I guess I will need a smaller pulley on the pump side....
thanks for that chart!

> Spec PDF for that blower:
> http://pumps.rapidservice.com/Asset/dvjwhispair_spec_s5582aqq.pdf
> If you're running natural gas, you need 10
> parts air to 1 part gas for neutral
> combustion. Natural gas is 1000 BTU per
> cubic foot, so to get 1000 BTU/hour, you
> need 10 cubic feet of air per hour.

> A set of neon torches running full bore is
> about 150,000 BTU/hour (figures vary; so
> does usage; this is an estimate.)

> 150,000 BTU = 150 cubic feet of gas,
> neutrally combusted = 1,500 cubic feet of
> air per hour = 25 cubic feet per minute.

> According to the above PDF, your blower will
> produce ~47 CFM at 2400 RPM. It looks like
> you're spinning it at around 800 RPM. Here's
> a pulley calc:
> http://www.blocklayer.com/pulley-belteng.aspx
> If the shaft diameters are the same, it
> looks like oyu could just swap the motor
> pulley for the blower pulley and hit ~3k
> RPM, which is less than the maximum for your
> blower.

> If you're running propane, neutral
> combustion is closer to 24 air : 1 gas.


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