MIL-DTL-8790F
3.4 Hazardous substances. The use of hazardous substances, toxic chemicals, or Ozone Depleting
Chemicals (ODCs) shall be avoided, whenever feasible.
3.5 Design and construction. The hose assembly shall be constructed with qualified hose (see
3.5.1) and end fittings (see 3.5.2) to meet the requirements specified herein and in the applicable
specification sheet.
3.5.1 Hose. The hose shall be as specified in MIL-DTL-8788.
3.5.2 Fittings. The fittings shall be as specified in MIL-DTL-8789.
3.5.3 Loosening or changing end fitting position. After the end fittings have been installed on the
hose, there shall be no loosening or changing of an end fitting position on the hose.
3.5.4 Length. Hose assembly tolerances shall be made only with the lengths specified in MS28759,
MS28762, MS28920, MS28921, and MS28924.
3.5.5 Orientation angle of bent tube couplings. The displacement angle shall be as specified in the
applicable specification sheet.
3.6 Examination of Product. The hose assembly shall conform to the materials (see 3.3),
examined as specified in 4.9.1.
3.7 Performance. Hose assemblies shall satisfy the following performance requirements.
3.7.1 Bulge resistance. The ball gage, used to determine the inner tube diameter at the bulge, shall
fall freely through the hose assembly under its own weight through the section of the end-fitting insert in
the hose, when tested as specified in 4.9.2.
3.7.2 Proof pressure. The hose assembly shall not leak or fail during or at the completion of the test,
when tested as specified in 4.9.3, with the applicable proof pressure specified in table I. There shall be
no visual evidence of damage or permanent deformation.
3.7.3 Leakage. The hose assembly shall not show any evidence of leakage during or at the
completion of the test, when tested as specified in 4.9.4.
3.7.4 Burst pressure. There shall be no leakage in the hose assembly, when tested as specified in
4.9.5, below and including the minimum burst pressure specified in table I. The hose shall not burst or
develop a permanent blister. The fittings shall not loosen or disconnect from the hose.
3.7.5 Impulse. The hose assembly shall not show any evidence of leakage, burst, or fitting loosening
or fitting blow off, when tested as specified in 4.9.6.
3.7.6 Low temperature flexibility. The hose assembly shall not leak and fail at the completion of the
test, when tested as specified in 4.9.7. There shall be no visual evidence of damage or permanent
deformation.
3.7.7 Over-tightening torque. The fittings shall not show any evidence of material failure,
deformation of the assembly or difficulty in turning the swivel nut on the nipple by hand, when tested as
specified in 4.9.8.
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