How we increase the pressure of a air compressor

In summary, using a compressor with an inlet pressure of 25 psi would require a special screw machine, as the suction pressure is above atmospheric.
  • #1
ahsuu
2
0
my question is that..

is there any way to increase the pressure from 25 psi to 125 psi...is the volume is 5.2m3/min...
 
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  • #2
It depends entirely on the compressor. Can the compressor physically survive an output pressure of 125 psi?
 
  • #3
Also the reservois, if one is used, and the lines. Make sure that you stay well below the burst pressure.
May I ask why you want to do this, rather than just replace the compressor with a higher-rated unit? About the only 35psi compressor that I've seen was a really cheesy little thing that plugs into the lighter socket in a car for emergency tire inflation. I've never even seen one that was only 25 psi.
 
  • #4
It really depends. If the demand is high enough the compressor may keep up with the volumetric requirement, but not at a high enough pressure. If this is the case, then one needs to either increase the backpressure on the system or reduce the demand.
 
  • #5
Hi ahsuu,
I think what you're saying is you have a 25 psi source of air in a process that you'd like to increase to 125 psi at a flow of 5.2 m3/min. Assuming compressor displacement is 5.2 m3/min (500 SCFM), that becomes a 60 to 75 hp machine. That's not a particularly large machine, but depending on who you talk to, it's fairly substantial. (Note, you should always put down normal or standard conditions, or better yet just use mass flow rate. Actual displacement is always more confusing and will inevitably get you in trouble when specifying a machine.)

Screw machines would be the best solution for this size of air compressor. It's a bit large for a recip and a bit small for a centrifugal, though I suspect that with the overlap, you could find both recips and centrifugals capable of doing this duty. Regardless, I'd suggest a screw machine.

Unfortunately, you're asking for a special, because the suction pressure is above atmospheric. That isn't to say you shouldn't pursue that option, but at least consider alternative ways of doing this. Contact the screw machine manufacturers to discuss 25 psi inlet but then consider just regulating the air down to atmospheric, or better yet just using atmospheric air, then compressing to 125 psig. The reason to do this is that, although you'll loose some efficiency because you have to now increase pressure from 0 to 125 psig, you can get a screw machine off-the-shelf, something mass produced. It will be a lot cheaper on capital cost. Something capable of an inlet pressure of 25 psi is an odd-ball, and may have to be specially made or a standard machine would need to be modified.

Note you're roughly doubling the power required by using atmospheric inlet pressure for any given mass flow rate.

Here's a short list of different manufacturers you might check out.

Corken (recips)
Ingersol Rand (all kinds)
Burton Corblin (recips)
Any screw compressor manufacturer (I-R, Atlas Copco, Keiser, etc...)

Also, if you're in the US or Canada, I'd suggest using ThomasNet for searches on manufacturers like this. Try them here:
http://www.thomasnet.com/
 

1. How does an air compressor work?

An air compressor works by using a motor to power a piston or impeller, which compresses air and stores it in a tank. When the tank is filled, the compressed air is released through a hose or nozzle at a higher pressure than the surrounding air.

2. What factors affect the pressure of an air compressor?

The pressure of an air compressor is affected by the size and power of the motor, the size and design of the compressor's components, and the amount of air being compressed. Additionally, factors like temperature and altitude can also affect the pressure of an air compressor.

3. How can we increase the pressure of an air compressor?

To increase the pressure of an air compressor, you can adjust the motor speed or size, adjust the size or design of the compressor's components, or limit the amount of air being compressed. You can also use a multi-stage compressor, which compresses the air in multiple stages to achieve higher pressures.

4. Is there a limit to how much pressure an air compressor can produce?

Yes, there is a limit to how much pressure an air compressor can produce. This limit is determined by the design and materials of the compressor, as well as the safety measures in place to prevent over-pressurization. Exceeding this limit can cause damage to the compressor and potential safety hazards.

5. Are there any safety precautions to consider when increasing the pressure of an air compressor?

Yes, there are several safety precautions to consider when increasing the pressure of an air compressor. It is important to follow the manufacturer's guidelines and recommendations for pressure limits. Additionally, regular maintenance and inspections should be performed to ensure the compressor is functioning properly and safely. Proper training and protective gear should also be used when operating an air compressor.

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