MIL-PRF-62028D
3.2.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered,
or environmentally preferable materials should be used to the maximum extent possible provided
that the material meets or exceeds the operational and maintenance requirements, and promotes
economically advantageous life cycle costs.
3.3 Operating requirements. Each hose shall provide the following functional,
operational, and performance requirements as specified in 3.3.1 through 3.3.5.
3.3.1 Leakage. The hose shall not leak air at a rate of more than 0.02 cubic feet per
minute (ft3/min), per inch (in.) of inside diameter (ID), per foot (ft) of length, at the applicable
maximum positive working pressure specified in table I.
TABLE I. Working pressure requirements.
Working pressure,
pounds per square inch gage (psig)
Hose ID, in.
Type I
Type II
Minimum
Maximum
(min.)
(max.)
Negative
Positive
Negative
Positive
0.50
3.00
-5.0
5.0
-5.0
16.0
3.01
4.00
-2.0
4.0
-2.0
12.0
4.01
5.00
-1.0
3.0
-1.0
10.0
5.01
6.00
-0.5
2.5
-0.5
8.0
3.3.2 Proof and burst pressures. The hose shall withstand the applicable proof and burst
pressures specified in table II without rupturing.
TABLE II. Proof and burst pressure requirements.
Hose ID, in.
Proof pressure, psig
Burst pressure, psig
Min.
Max.
Type I
Type II
Type I
Type II
0.50
3.00
10.0
32.0
20.0
64.0
3.01
4.00
8.0
24.0
16.0
48.0
4.01
5.00
6.0
20.0
12.0
40.0
5.01
6.00
5.0
16.0
10.0
32.0
3.3.3 Vacuum resistance. While curved to a radius equal to five times the outside
diameter (OD) of the hose, the hose shall withstand a vacuum of 10 in. of mercury without the
OD being reduced more than 5 percent (%), or without the ID collapsing or separating from the
balance of the hose structure.
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