MIL-HDBK 1028/6A
Table 3
Example of Design Method Starting Air System
RECOMMENDED UNIT CAPACITY
Step
Description
1.
Number and type of aircraft:
36 F-14 aircraft
2.
Aircraft requirements:
Starting air = 85 lb/min 45 psig 2 engines
*Electrical = 20.0 kVA, 400 Hz
3.
Aircraft to be served simultaneously:
36 aircraft
= 12 aircraft
3.0 diversity factor
4.
Number and location
of services to be provided:
Starting air = 12
on flight line
Electrical = 4 in
hangar
Electrical = 8 on
flight line
5.
System capacity:
Starting air storage capacity:
12 aircraft x 85 lb/min x 1 min x 2 engs = 2040 lb
2040 lb x 13.33 scf/lb = 27,192 scf (total)
2300 cf x 115-65 psig = 7823 scf (pipeline)
14.7 psi
27,192-7823 scf x 14.7 psi = 970 scf (receiver)
240-65 psig
Starting air compressor capacity:
27,192 scf
= 230 scfm
120 min
Electrical:
12 aircraft x 20 kVA/aircraft = 240 kVA
6.
Equipment unit size:
Starting air: (receiver capacity)
970 scf = 245 scf
4
Starting air: (compressor capacity)
230 scfm = 57 scfm
4
7.
Select 4 compressors at 55 scfm 250 psig each and 4
nominal 250 scf storage tanks.
*Includes Spare Capacity - see Table 1.
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