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Re: air pump
Posted By: George Vidas In Response To: air pump (John Dragun)
Date: Friday, 5 September 2014, at 1:17 a.m.
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.
> Hi all.
> I have been using a circa 1940's roots pump
> for my air and she sounds like she is going
> to die any minute.> I picked up a 2504DVJ pump and have it
> running off a 3/4 horse motor, purrs softly.
> But I am not getting enough air out of it.
> Has anyone used a pump like this before?
> What size pulley are the best. The motor is
> turning at 1725 rpm with a 3" pulley on
> the motor and a 6" on the pump. Not
> even enough airflow to get the cannon fire
> all alone on it. Any ideas or suggestions?
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