MIL-HDBK-1191
DCA System Demand. The system shall be sized using the
9.6.11.3
following criteria.
(a) Select a DTR Usage Factor:
DTR Usage Factor (DUF)
Number of DTR's
1- 3
1.0
4- 6
0.9
7 - 12
0.8
13 - 19
0.7
20 and up
0.6
(b) DTR Demand = No. of DTR's X 1.42 L/s X DUF
(c) Select a lab usage factor:
Lab Usage Factor (LUF)
Number of Technicians
1- 5
0.6
6 - 10
0.5
11 - 19
0.4
20 and up
0.3
(d) Lab Demand =
No.
of
Technicians
X
0.472
L/s
X
LUF
+
No.
of
sand/shell blasters
X
1.888
L/s
X
LUF
+
No.
of
air chisels
X
1.415
L/s
X
LUF
+
No.
of
denture presses
X
0.472
L/s
X
LUF
+
No.
of
microblasters
X
2.831
L/s
X
LUF
+
No.
of
high speed handpieces
X
1.415
L/s
X
LUF
(e) Sterilization demand =
No. of handpiece purge
stations X 0.472 L/s.
(f) Standard demand =
DTR demand + Lab demand + Sterilization demand.
(g) Select the optimum compressor grouping:
COMPRESSOR GROUPING
System Usage Factor (SUF)
Type_
Duplex
0.65
Triplex
0.33
Quadplex
0.25
(h) Compressor size = SUF X Standard demand
(i) The receiver shall be sized based on Table 9-6.
9-20
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