Compresses Air Table

8/7/2019 Compresses Air Table

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High efficiency filters

Replaceable element, typical filtration to 0.01um, oil to 0.01 mg/m3

Activated carbon filtersDesigned for oil removal to


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Correct Pipe Sizing

Pressure drop across distribution system should be less than 0.2 bar

Consider low friction aluminium or plastic piping systems

Points to consider when dealing with piping:

Horizontal lengths of distribution piping should be

sloped slightly downwards, with provision for

moisture drainage.

When designing a compressed air system, it is often a

good practice to add 30% to the expected air flow (to

add for future potential system expansion), and then

select the pipe diameter having the lowest pressure

The maximum design velocity for main distribution pipework is 6m/s

Forshort branch lines the velocity can be up to 15m/s


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The size of an air receiver can be calculated as follows:

reciprocating compressors

the rule of thumb for sizing a primary air receiver, has been from 1 gallon per cfm to 3 gallons per cfm of

compressor capacity

Primary air receivers

As a rule of thumb, for load/unload operated lubricated screw

compressors, the receiver volume should be 5 to 10 US gallons

(20-40 liters) per trim compressor scfm output. Other factors

come into play when sizing, such as the type of air compressor

method of capacity control and compressor starting delays.

Secondary receivers


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with a significant pressure differential across the system. The

alternative is to use a secondary storage receiver with the inlet

restricted by an orifice or needle valve.

100 cfm x 1 minute = 100 cubic feet

Pressure (psi) range = 20

Storage receiver required = 100 cubic feet 110/20

psi= 550 gallons (US)

This receiver could be filled over 10 minutes at a rate

of 10 cfm which would reduce the previous system

pressure differential by a factor of 100.

Facilities having large fluctuations in air demand, or havinginsufficient air pressure (usually at the end of the line), should

evaluate the need for one or more air receivers strategically

located in the air distribution system.


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1 gallon for each ACFM (Actual Cubic Feet per Minute), or

4 gallons per compressor hp (horse power)


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Resistance of Pipe Fittings in Equivalent Lengths (in metres)Compressed Air System


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Question: A 23 metre pipe with an inner diameter of 80 mm shall lead a flow of 140 l/s. Thepipe is routed with 8 elbows that all have a bend diameter equal to the inner diameter. How

great will the pressure drop across the pipe be if the absolute initial pressure is 8 bar(a)?

8 x 1.3 + 23 = 33.4 meters


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Compresses Air Table

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