MIL-PRF-370J
3.3.7 Requirements of hose assemblies.
3.3.7.1 Proof pressure. Hose assemblies shall not leak nor have deleterious imperfections
when subjected to the appropriate proof pressure, with respect to hose size, as specified in
table IV (for hose assemblies constructed with type A, B or D hose) or table V (for hose
assemblies constructed with type C hose). There shall be no slippage or pullout of the fittings
from the hose. For Type A, B, and D hose, the length of the hose shall not change more than
±7% when subjected to proof pressure. For type C hose, the length of hose shall not change
more than ±2% when subjected to proof pressure. Type A and C hose shall not twist more than
one-half turn (180°) in 25 ft when subjected to proof pressure.
TABLE IV. Pressure requirements for type A, B and D hose.
Hose Nominal
Proof pressure,
Burst pressure,
Working pressure,
I.D. (in)
minimum (psig)
minimum (psig)
maximum (psig) 1/
0.50
250
500
125
0.75
250
500
125
1.00
250
500
125
1.25
250
500
125
1.50
250
500
125
2.00
225
400
100
2.50
225
375
94
3.00
150
300
75
4.00
150
300
75
6.00
150
300
75
1/ Recommended.
TABLE V. Pressure requirements for type C hose.
Hose Nominal
Proof pressure,
Burst pressure,
Working pressure,
I.D. (in)
minimum (psig)
minimum (psig)
maximum (psig) 1/
2.00
400
600
150
3.00
400
600
150
4.00
400
600
150
6.00
400
600
150
1/ Recommended.
3.3.7.2 Burst pressure. The hoses shall have a minimum burst pressure as specified in
table IV (for hose assemblies constructed with type A, B or D hose) or table V (for hose
assemblies constructed with type C hose). For hose assemblies constructed with type C hoses,
the hoses shall not fail radially.
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