MIL-DTL-26499E
4.7 Test methods.
4.7.1 Dimension inspection (see 3.4.1). A corrugated hose sample shall meet the requirements of
3.4.1. The dimension inspection shall be conducted after the hose has been cut to length, but prior to the
soldering of the end connection to the corrugated hose.
4.7.2 Examination of product. The hose assembly shall be inspected to determine compliance with the
requirements specified herein with respect to workmanship (see 3.8), materials (see 3.3), marking (see
3.7) and cleaning (see 3.6.1). The hose overall length shall be checked against figure 1 as applicable to
the nominal length specified (see 6.2).
4.7.3 Proof pressure test (3.5.1). Each hose assembly shall be subjected proof pressure testing and
meet the requirements of 3.5.1. The following details shall apply:
a. Hydrostatic pressure of 4,800 psig (330.945 bar) for a minimum of 3 and a maximum of 10
minutes.
b. Clean water shall be used as the pressurizing fluid.
c. Evidence of leakage from any part of the hose assembly shall be cause for rejection.
d. Except for hose assemblies selected for the sampling tests or qualification test, satisfactory hose
assemblies shall be cleaned, dried, and plugged in accordance with 3.6 after completion of the
proof pressure test.
4.7.4 Low temperature test (see 3.5.2). The hose assembly when exposed to low temperature
extremes shall meet the requirements of 3.5.2. The following details shall apply:
a. Hose assembly shall be brought to a stabilized temperature of -65°F (-53.89°C).
b. While at -65°F (-53.89°C), the hose assembly shall be grasped by the end connections and bent
180° around a 4-inch (101.60 mm) mandrel, after which the hose assembly shall be inspected for
cracks or breaks in any component or junction.
4.7.5 Vibration (see 3.5.3). The hose assembly shall be subjected to a vibration and meet the
requirements of 3.5.3. The following details shall apply:
a. Hose assembly shall be subjected to a vibration of 3,600 cycles per minute (cpm) while
pressurized to 4,800 psig (330.95 bar).
b. One end of the assembly shall be connected to a fixed object and the other end shall be
connected to a moving object having a double amplitude of vibration of at least .125 inch (3.18
mm).
c. The end connected to the moving object shall be so mounted that the central axis of the hose end
is parallel to the direction of vibration.
d. The hose shall be bent 180° during the entire test and shall be vibrated for at least 4 hours. Any
sign of leakage or cracking shall be cause for rejection.
4.7.6 Pressure impulse test (see 3.5.4). The hose assembly shall be subjected to a pressure and shall
meet the requirements of 3.5.4. The following details shall apply:
a. Impulse cycle from 0 to 2,400 to 0 psig (165.47 bar) at the rate of approximately 1 cycle per
second for 15,000 cycles.
b. The hose assembly shall be bent 180° during the entire test.
c. Any sign of leakage or cracking shall be cause for rejection.
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