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Associate

Join Date: Nov 2011
Posts: 48

Multiple Compressor Recommended Pressure Setting for Min Offload Time

11/21/2011 5:29 AM

Hi,

I was going through the log sheets of the compressors at my plant and i observed that 2 of the three compressors we have (rated at 45KW, 6m3/min) have a loaded hours/total running hours ratio of 0.5. Considering this duty cycle of 0.5 and current power tariff considerable amount has been wasted. I studied the topic a bit and found out that if the pressure setting of the compressors is to be changed to a sort of cascaded arrangement then power can be saved. Currently all three compressors load at a pressure of 7 bar and unload at 7.5 bar. I the pressure setting is changed as follows;

compressor 1 unload-load----> 7.6-7.0

compressor 2 7.3-6.8

compressor 3 7.2-6.7

We have 2 IR MM37GD (rotary screw oil injected 45Kw, 6m3/min) and a renner (rotary screw oil injected 37KW,5.5m3/min) compressor. The plant air demand fluctuates widely.

Please can anybody explain the reasoning behind this in terms of power savings and implications in terms of air supply and that what could be the most optimum settings. I have never worked with compressors before kindly be as explanatory as possible.

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Guru

Join Date: Aug 2010
Posts: 687
Good Answers: 21
#1

Re: Multiple Compressor Recommended pressure setting for min offload time

11/21/2011 7:19 AM

Before I or most anyone would answer this question a lot more details would need to be put forth. Has your organization completed a compressed air survey on usages in your facility? If not, I would start there. You need to fully understand the losses and uses of this commodity before making any changes. There are many compressor suppliers that will help you with this type of investigation. It will open your eyes to the real cost of air an help determine the savings that can be obtained.

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
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#2

Re: Multiple Compressor Recommended pressure setting for min offload time

11/21/2011 7:37 AM

The best energy savings are achieved by fixing leaks in the delivery system.

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Associate

Join Date: Nov 2011
Posts: 34
Good Answers: 2
#3

Re: Multiple Compressor Recommended Pressure Setting for Min Offload Time

11/21/2011 11:06 PM

Hi,

I have done some path breaking work in designing the compressed air system in our Polyester plant which uses Compressed air for various applications. We analysed the consumption points and found that There are two main types of consumers, 1. Low pressure with constant demand and 2. High pressure with Highly fluctuating demand. So we introduced the concept of booster compressors in our plant and could save on a large amount of energy. This practice is now followed in all similar plants in india.

We definitely can work out a solution. Request to please send us the details regarding the consumers of compressed air..qty and pressure required at each point.

Thanks and best wishes

K K Gupta

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Associate

Join Date: Nov 2011
Posts: 48
#4
In reply to #3

Re: Multiple Compressor Recommended Pressure Setting for Min Offload Time

11/21/2011 11:14 PM

Thank you all for your feedback. I am arranging an activity to calculate the air demand and leakage at our plant. Once done I will get back with the figures.

Kind regards

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Guru

Join Date: Aug 2007
Location: London England.
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#5

Re: Multiple Compressor Recommended Pressure Setting for Min Offload Time

11/22/2011 4:44 AM

Shut one down.

Bazzer.

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