MIL-DTL-29210E
3.5 Strength.
3.5.1 Proof pressure. The hose assembly, complete with metal liner and couplings, shall withstand a
proof pressure of 1250 psig (8.6 MPa (gauge)) without leakage or other indication of weakness when
tested in accordance with 4.7.1.2.
3.5.2 Burst resistance. The hose, without liner, shall not burst at a pressure less than 2500 psig
(17 MPa (gauge)) when tested in accordance with 4.7.2.5.
3.6 Ozone resistance. The rubber cover shall show no visible cracking under 7X magnification after
testing in accordance with 4.7.2.3.
3.7 Steam resistance. When tested as specified in 4.7.2.4, there shall be no delamination of body
components, cracks through the cover exposing reinforcement, or weakness of the fittings. The hose
shall reveal no flaws, such as blistering, cracking, flaking, or popcorning of the tube or cover when tested
as specified in 4.7.2.4.
3.8 Identification marking. Each length of hose shall be marked in a color that contrasts with the
color of the hose cover. Marking shall be non-removable except by mechanical means. The marking
shall consist of the manufacturer's name or trademark, the quarter and year of manufacture,
MIL-DTL-29210, "250 psig (1724 kpa (gauge)), and the word "STEAM". Letters shall be not less than
0.25-inch (6 mm) high.
3.8.1 Marking tag. A marking tag shall be wired near each end fitting (two tags per length of hose),
advising users of all safety precautions to be followed in the use of the hose. The following shall be
included on the tag:
a. Hose clamps shall be checked for proper application and shall be re-tightened, as necessary,
prior to being placed into service. Be sure that clamps are interlocked over the collar on the
nipple and that each clamp half interlocks with the other.
b. Hose clamps shall be tightened after the first several hours of steaming of the hose and
periodically thereafter.
c. The importance of taking up evenly on all bolts to prevent cocking of the hose clamps shall be
emphasized.
d. Torque requirements for clamp hardware.
e. Other operational and maintenance suggestions considered necessary by the hose and end
fitting manufacturers.
3.9 Age. Hose assemblies shall meet the age limitation requirements specified in SAE-AS1933.
3.10 Workmanship. Workmanship inspection shall consist of verification that the materials, finishes,
and construction, specified in table VI, are used in fabricating and manufacturing of the hose and hose
assemblies described in this specification.
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