MIL-DTL-26894D
3.4.1 Length change. The length of the hose shall not change more than 7 percent when
subjected to the applicable tests specified in 4.4.
3.4.2 Adhesion between tube and adjacent parts. When tested in accordance with 4.4.3,
the rate of separation between tube and plies, between plies, and between cover and plies
shall be not greater than 1 in/min when tested under a load of not less than 5 lb/in.
3.4.3 Abrasion resistance of the cover. When subjected to testing in accordance with
4.4.4, the volume of material abraded from the cover shall be not greater than 160 mm3.
3.4.4 Burst resistance. The hose shall not burst or develop a permanent blister when
tested in accordance with 4.4.5.
3.4.5 Low temperature flexibility. When tested in accordance with 4.4.6, the force
required to open the concave hose to approximately 90° angle shall be not greater than 125 lb.
3.4.6 Low temperature bend. Samples of both the tube and cover shall not crack tested
in accordance with 4.4.7.
3.4.7 Volume increase. When tested in accordance with 4.4.8, the volume increase of
the tube and cover shall be not greater than 30 and 60 percent, respectively.
3.4.8 Tensile strength. When tested in accordance with 4.4.9, the tensile strength of the
tube and cover shall be not less than 600 and 400 psi, respectively.
3.4.9 Ultimate elongation. When tested in accordance with 4.4.9, the ultimate elongation
of the tube and cover before immersion shall be not less than 200 percent. After immersion,
the ultimate elongation of the tube and cover shall be not less than 100 percent.
3.4.10 Pull resistance. When tested in accordance with 4.4.10, the distance between the
white marking and the adjacent coupling shall be not greater than 0.062 inch. The hose
assembly shall neither break nor shall its couplings disconnect from the hose.
3.4.11 Crush resistance. After being subjected to testing in accordance with 4.4.11, the
OD of the hose shall be not less than 95 percent of its original size.
3.4.12 Proof pressure. When tested in accordance with 4.4.12, the hose shall not crack,
leak or malfunction in any way.
3.4.13 Surge pressure cycling. The hose assembly shall not leak or burst during or at the
completion of 500 cycles of surge pressure when tested in accordance with 4.4.13.
3.5 Interchangeability. All hose bearing the same manufacturer's part number shall be
functionally and dimensionally interchangeable. MIL-DTL-31000 shall govern the designation
of manufacturer's part numbers and changes thereto.
3.6 Dimensions.
3.6.1 Diameter. The hose assembly shall have an inside diameter of 4 ±0.031 inch and
an outside diameter of 4.875 ±0.063 inch.
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