On of way of determining the Free Air Delivery (FAD) of the compressor is by Pump Up
Method – also known as receiver filling method [7]. Although this is less accurate, it can be
adopted where the elaborate nozzle method is difficult to be deployed. The Free Air delivery
qFAD in m3/h is calculated as follows:
2
2 1 1
T
T
p t
V (p p )
q =
N