MIL-DTL-13719G
3.4.3 Length of bulk hose.
3.4.3.1 B designator of bulk hose lengths. Bulk hose shall be furnished in lengths greater than 20
feet (6.10 m). However, up to 10% of the order may be furnished in random lengths between 10 and 20
feet (3.05 to 6.10 m). No more than 10% of the order shall be furnished in random lengths between 3 and
10 feet (0.91 to 3.05 m).
3.4.3.2 S designator for specific bulk hose lengths. When the order is for a specific length in feet, a
tolerance of ±1% of the required length shall be used.
3.5 Performance. The hose shall meet the following performance requirements. When necessary
for testing, the hose shall be assembled with end fittings that have permanently attached brake hose end
fittings which are attached by deformation of the fitting about the hose by crimping or swaging.
3.5.1 Constriction (hose assemblies only). After assembly, the bore of the hose assemblies shall be
tested in 4.5.3. An unconstricted bore shall allow the full length of the plug gage to drop into the hose
assembly bore of its own weight in less than 5 seconds.
3.5.2 Proof pressure. Hose and hose assemblies, when tested in 4.5.4, shall show no evidence of
leakage when subjected to an internal pressure of 1,500 pounds per square inch (psi) (10.3 megapascal
(MPa) minimum for air or 3,000 psi (20.7 Mpa) minimum for liquid.
3.5.3 Expansion resistance. Hose, when tested in 4.5.5, shall not expand more than the values
shown in table III.
TABLE III. Maximum hose expansion. 1/
1,000 psi (6.9 Mpa)
1,500 psi (10.3 Mpa)
Hose
Reg. expansion Low expansion
Reg. expansion
Low expansion
ID
hose type I
hose type II
hose type I
hose type II
inch (mm)
3
3
3
3
3
3
3
3
cm /ft (cm /m)
cm /ft (cm /m)
cm /ft (cm /m)
cm /ft (cm /m)
.125 (3.18)
.66 (2.17)
.33 (1.08)
.79 (2.59)
.42 (1.38)
.188 (4.78)
.86 (2.82)
.55 (1.80)
1.02 (3.35)
.72 (2.36)
.250 (6.35)
1.04 (3.41)
.82 (2.70)
1.30 (4.27)
1.17 (3.85)
1/ Metric equivalents are given for information only.
3.5.4 Bursting strength. Hose assemblies, when tested in 4.5.6, shall withstand, without leaking or
bursting, an internal hydrostatic pressure for a 2-minute hold period and any pressure up to and including
the burst pressures, as specified in table IV.
TABLE IV. Hold and burst pressures. 1/
Hydrostatic pressure
Hose nominal ID
2-minute hold
Minimum burst
inch (mm)
psi (Mpa)
psi (Mpa)
.125 (3.18)
4,000 (27.6)
7,000 (48.2)
.188 (4.78)
3,000 (20.7)
5000 (34.5)
.250 (6.35)
3,000 (20.7)
4,500 (31.0)
1/ Metric equivalents are given for information only.
3.5.5 Fatigue life (whip). Hose assemblies, when tested in 4.5.7, shall have a minimum life of 35
hours.
5
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