You may already read my blog about how to size air compressor and instrument air capacity. Please check this link if you have not read the article. I hope you find it useful.

As a continuation of the post, I want to share you how to size capacity of compressed air receiver.

Compressed air receiver is used as buffer and storage medium between the compressor and air consumers.

A common formula used to size compressed air receiver is as followed:

**V = (t/60) x C x p _{a}/(p_{1}-p_{2})**

Where:

V = volume of receiver tank (m^{3})

t = time for the receiver to go from upper to lower pressure limit (minute)

C = air consumption (m^{3}/h)

p_{a} = atmospheric pressure (1.01 bara)

p_{1} = maximum tank pressure (bara)

p_{2} = minimum tank pressure (bara)

**Example Sizing of Compressed Air Receiver**

For an air compressor system with air consumption 100 Nm^{3}/h, with actual supply pressure 8 barg (8.84 atma) and actual supply temperature 30^{o}C (303.15 K), maximum tank pressure 9 barg (10.01 bara), minimum tank pressure 7 barg (8.01 bara) and 15 minutes time for the receiver to go from upper to lower pressure – the volume of the receiver tank can be calculated by following step.

**Step 1: Calculate air consumption (C) at actual condition**

Air consumption at actual condition can be simply calculated by using the following formula:

P_{1} x V_{1}/ T_{1} = P_{2} x V_{2}/T_{2}

Where:

P_{1} = Pressure at standard condition (1 atma)

T_{1 }= Temperature at standard condition (273 K)

V_{1} = Air consumption at standard condition (Nm^{3}/h)

P_{2} = Pressure at actual condition (atma)

T_{2} = Temperature at actual condition (K)

V_{2} = Air consumption at actual condition (m^{3}/h)

Equation above is modified into:

V_{2} = P_{1} x (V_{1}/ T_{1}) x (T_{2}/P_{2})

V_{2} = 1 x (100/273) x (303.15/8.84)

V_{2} = __12.56 m ^{3}/h__

So, air consumption at actual condition is 12.56 m^{3}/h.

**Step 2: Calculate air receiver capacity**

Use this formula to estimate air receiver capacity:

**V = (t/60) x C x p _{a}/(p_{1}-p_{2})**

V = (15/60) x 12.56 x 1.01/(10.01-8.01)

V = 1.58 m^{3}

So, estimated air receiver capacity is 1.58 m^{3}.

I hope you find this post useful.

Tired of calculationg by yourself? Click this link to download spreadsheet of preliminary sizing of air receiver capacity.