6 replies to this topic

[Ramkumar]

I need to select compressors and air dryers for the following requirements:

1. 1000 nm3/hr at 9 bar
2. 7000 nm3/hr at 12 bar
3. 3250 nm3/hr at 15 bar

What will be the best combination of compressors for the above presssures? Can I opt three compressors for three different pressures or can I go for two compressors - one at 12 bar and reduce pressure to 9 bar and one at 15 bar?

What will be the best combination of compressor and dryer?

Regards,
D. Ramkumar

[Art Montemayor]

Ramkumar:

What you furnish is totally insufficient information. An engineer cannot respond to the questions you ask without knowing (at the very least):

1. The type, identification, and full description of the process they will be feeding and its sensitivities with regards to contamination, flow variation, pulsations, and turn-downs in capacity;
2. The type of air compressor – dynamic or prositive displacement – and its driver;
3. The type of operation of the process – batch or 24 hours/day – 7 days/week.

Even without knowing anything about your process or the application, I would not follow the train of thought you seem to be seeking: using one, 11,250 nm³/hr compressor at 15 bar(g) discharge and distributing the lower pressure supplies from each stage. I have never seen this done, but that doesn’t mean it can’t be done – if the economic incentives are sufficient. I would not seek anyone’s opinion or recommendation on this idea without consulting directly with compressor manufacturers. Anyone else’s opinion is a waste of time, in my opinion.

[JoeWong]

3 pressure level with demand on each level can generate many combinations...

In addition to the list by Mr. Montemayor :

4) are the indicated flow continuous, intermittent or peak ?
5) if they are continuous flowrate, what are the peak flow and how long is the demand of peak flow ?
6) what's the strategy on the buffer volume ? Large buffer to cater for intermittent peak or small buffer with large compressor ?
7) Dedicated buffer for each level ?
8) what sparing philosophy should be followed ?

Answers to these questions may lead you to some good combination......

[JoeWong]

The nature of your question is not same as the original post. Suggest you to open a post...

Thanks for your warning. I made a new thread. FYI, it is a commercial practice, so I put it under Chemical Professional.

[jerrymai007]

Hi, I have a 88 cubic feet receiving tank and 386 cubic feet vessel, what is the capacity (scfm) of an air compressor do I need to buy for the best suitable for these volumes.

Pressurization to these two volume is 10psi/min.
And final pressure is 150 psi.
Thanks,

[breizh]

Should help you

http://www.engineeri...vers-d_846.html

Breizh