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Application for Pressure Blower or not?

Application for Pressure Blower or not?

Application for Pressure Blower or not?

(OP)
I need to over come 12 feet of water column and deliver 200 CFM (Texas ambient T&P conditions) to a fluidizing/backwash process for 3 minutes once every several days. Having trouble finding a pressure blower to deliver the 5 pisg without a relatively big motor. The 200 CFM for 3 minutes means all I need is 600 cubic feet or 4,500 gallons of 5 psig air. I could go with a 150 psig compressor and tank arrangement and I am thinking I could almost get there as long as I could get 200 CFM out of the tank.

- Would the compressor and say 200 gallon tank have a chance of working?

- Is this an application for a pressure blower and I need to keep looking?

- Are there options I'm overlooking?

A reasonable budget for this project would be less than two grand. Unfortunately the piping (and under-sized blow) is in place from someone else's attempt so the plumbing, cabling, etc are in place and the two grand just needs to cover the motor and blower/compressor. Any ideas would be appreciated!

Thanks,

TexasChE

RE: Application for Pressure Blower or not?

You are on the right track, but a bigger pressure vessel is needed. About 600 gallons. Ratio using absolute pressures, not gage.

Good luck,
Latexman

Technically, the glass is always full - 1/2 air and 1/2 water.

RE: Application for Pressure Blower or not?

How do you propose to throttle the 150 psig pressure down to 5 psig? The valve and controller to accomplish the pressure reduction will set you back hundreds of dollars.

You will be better served if you go with a standard 5 psig positive displacement blower.

If it was feasible to do what you are considering, then people would already be doing it that manner.

RE: Application for Pressure Blower or not?

(OP)
Hi Bimr, I switched over to absolute pressures like Latexman reminded me of and a standard shop compressor will deliver the necessary air. I assume regulators exist to drop to 5 psi but have not looked. I am just not finding 5 psi blowers on the market. Please let me know if I'm missing some that would be a solution and thanks for the response.

RE: Application for Pressure Blower or not?

Google "Roots Blower". They have them. There are probably others; blowers usually go up to about 20-25 psig from small to huge in size.

Good luck,
Latexman

Technically, the glass is always full - 1/2 air and 1/2 water.

RE: Application for Pressure Blower or not?

(OP)
Latexman and bimr,

This has been very helpful. The roots blowers look perfect for the application and the compressed air route looks like it has potential but not a desireable route.

Thanks Again,

TexasChE

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