MIL-HDBK 1028/6A
Table 2
Summary of Design Method for Quantities and Ratings, Central
Facilities Equipment Selection, Starting Air System
BASIS OF DETERMINATION FOR RECOMMENDED UNIT
CAPACITY
AND NUMBER OF EQUIPMENT UNITS:
Step
Description
1.
Number and type of aircraft:
2.
Aircraft service requirements:
Starting air = lb/min psig (per engine)
Electrical = kVA, Hz
3.
Aircraft to be served simultaneously:
Total number of aircraft = aircraft to be served
Diversity factor
4.
Number and location of services to be provided:
Starting air = number, flight line
Electrical = number, hangar
Electrical = number, flight line
5.
System capacity:
Starting air storage capacity:
Number aircraft x lb/min x min x (no. engines)** = lb
Storage vol., std. cu. ft. (scf) = lb x specific volume
Pipeline equiv. vol.=pipe vol. x allowable pressure drop
atmospheric pressure
Receiver capacity=(stor.vol.-pipe equiv.)x atmos. press.
allowable pressure drop
Starting air compressor capacity:
Storage, volume, scf
= scfm
Recovery time, minutes
Electrical capacity:
Number aircraft x kVA/aircraft = kVA
6.
Equipment unit size:
Total system capacity (Item 5) = unit capacity
*Number of units
7.
Select manufacturer's standard size that meets or exceeds
unit capacity calculated
* Recommended number of units is 4 (selected for 25 percent of total
system capacity).
** Refer to Table 1.
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