MIL-DTL-26633E
3.4.1.3 Tube rolling. When tested In accordance with 4.8.2.3, the PTFE inner tube shall meet the
gap dimensions for rolling requirements in accordance with SAE-AS2078 for size 04. The PTFE inner
tube shall not leak, split, burst, or show any evidence of failure.
3.4.1.4 Tube proof pressure. The tube without any reinforcing wires shall not leak, burst, or show
any evidence of permanent deformation when tested in accordance with 4.8.2.4.
3.4.2 Hose and hose assembly.
3.4.3 Proof. When tested In accordance with 4.8.4, the hose assembly shall show no indication of
leakage, distortion, or other defects.
3.4.4 Leakage. When tested In accordance with 4.8.5, the hose assembly shall show no indication
of pressure loss. The minimum room temperature burst pressure shall be 16,000 psig (827.37 bar).
3.4.5 Stress degradation. The air leakage rate, when tested in accordance with 4.8.6, from the hose
and two end fittings when held at 3000 psig (206.84 bar) after the stress degradation test shall not exceed
2.0cm3/in/min.
3.4.6 Elongation and contraction. When tested In accordance with 4.8.7, the hose assembly shall
withstand 3,000 psig (206.84 bar) without a change in its free length greater than ±2 percent.
3.4.7 Burst. Four hose assemblies shall be burst tested, 2 at room temperature (see 3.4.7.1) and 2
at high temperature (see 3.4.7.2).
3.4.7.1 Room temperature burst pressure test. When tested in accordance with 4.8.8, the hose
assembly shall withstand 16,000 psig (1103.16 bar) minimum without bursting.
3.4.7.2 High temperature burst pressure test. When tested in accordance with 4.8.8, the hose
assembly shall withstand 12,000 psig (413.69 bar) minimum without bursting.
3.4.8 Impulse. When tested in accordance with 4.8.9, using a minimum bend radius of 3.250 inch
(82.55 mm), the hose assembly shall show no indication of cracking, splitting, distortion, or leakage.
3.4.9 Tensile strength. The hose assembly when tested in accordance with 4.8.10 shall withstand a
tensile pull of 1,000 pounds (453.59 kg).
3.4.10 Overtightening torque. The end fittings, specified in 3.3.2.3, when tested in accordance with
4.8.11 shall withstand an overtightening torque of 315 pound-inches (35.59 N m).
3.5 Identification of the product. For hose lengths under 4 feet (1.22 m) each hose assembly shall be
identified by a permanently attached snug-fitting aluminum or stainless steel band around the hose near
the end fitting. Hose assemblies 4 feet (1.22 m) and greater in length, a band shall be attached near
each end fitting of the assembly. The metal band shall be marked in raised, etched, or stamped lettering
shall contain the following information appropriately identified:
a. Unique serial number.
b. Date of hose assembly manufacture expressed in month and year.
c. The rated working pressure in PSI, followed by the word "OXYGEN".
d. Hose assembly manufacturer's commercial and government entity (CAGE).
e. Hose manufacturer's CAGE if different from hose assembly manufacturer.
f. Specification PIN (see 1.2).
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