Sunday, December 28, 2008

Air Compressor Sizing

Air Compressor Sizing

3 Simple Ways on How to Select an Air Compressor

Two basic scenarios present to decide!
1. New Plant, and 2. Old Plant [to upgrade or downgrade]


1. New Plant
Step 1, Group all equipment in loading or usage categories.
If equipment is in use most or all the time into one group = 1. (100% loading)
Example: Production machinery, SMT, Conveyor etc


Another group or groups may be .6 [60% loading ], .3 [30% loading] in a day or working shift.

Step 2, Add up total usage and multiply with the usage factor, to arrive at the capacity usage.
Step 3, add about 10% to 15% of losses, due to leakage and other losses.

After listing all the air operated devices and equipments to be supplied by the air compressor, decide using charts, the pressure range and volume of air required by each and every devices and equipments.

These air compressor or compressors must maintain a minimum pressure at least equal the highest of these pressure ranges.

----- For Example:

If the highest pressure range required by any one device in a given group is 90 psi - 110 psi, a compressor or compressor must be able to supply the required volume, then the cut-in at not less than 90 psi and cut=out at 110 psi should be considered.

Exceptional:
Speed Controlled Air Compressor are used!

Then You have a rough idea of your plant compressed air requirement!

2. Existing Plant
2a. [Compressor always loading, that is cannot reach the required rated pressure]

Formula used:
P1V1 = P2V2




2b. [Compressor can off-load]

Formula used:
Air Consumption required = Vl/(u+l)





2c. Using Instruments
Energy Balance System

1 comment:

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