ZZ-H-617C
3.4 Performance characteristics.
3.4.1 Burst pressure. The hose shall withstand a hydrostatic pressure of 250 pounds per square inch (psi)
without leaking, bursting, or showing any other signs of failure when tested as specified in 4.4.2.
3.4.2 Vacuum resistance. The outside diameter of the hose shall not decrease by more than 30 percent and the inner tube shall not collapse or separate from the reinforcement when tested as specified in 4.4.3.
3.4.3 Flexibility. The outer cover and reinforcement shall not break, split, or loosen when tested as specified in 4.4.4.
3.4.4 Low temperature flexibility. The hose shall not break or crack when tested as specified in 4.4.5.
3.4.5 Tensile strength. The tensile strength of the hose shall be not less than the values specified in table III when tested as specified in 4.4.6. No part of the hose shall break at less than these specified values.
TABLE III. Tensile strength.
Hose Inside Diameter, inch |
Load, pounds |
.156 |
60 |
.219 |
80 |
3.4.6 Accelerated aging. The hose shall retain not less than 75 percent of its original breaking strength when tested as specified in 4.4.7. After aging, the hose shall meet the requirements specified in 3.4.2,
3.4.3, 3.4.4, and 3.4.5.
3.4.7 Ozone resistance. The hose surfaces shall show no signs of cracking when tested as specified in
4.4.8.
3.5 Marking. Unless otherwise specified (see 6.2), the hose shall be legibly marked on the outer cover at intervals of not more than 36 inches with the following information:
a. Specification number.
b. Manufacturer's name or trademark.
c. Nominal hose size (inside diameter). d. Capital letters "OZ".
e. Date of manufacture (quarter of year and year).
For hose less than 36 inches in length, the marking shall be approximately centered. If the marking cannot be made legible on short lengths, the trademark and the nominal hose size may be placed diametrically opposite the remainder of the marking.
3.6 Age. The age of bulk hose that is covered by this specification and furnished for use by the
Government shall not exceed the limits specified in AS1933.
3.7 Workmanship. The hose shall be manufactured to be uniform in quality and free from imperfections such as cuts, breaks, blisters, pitting, and exposed reinforcement. The surface of the hose shall be smooth and clean of loose foreign matter.
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