MIL-PRF-62411/1A(AT)
Internal leakage. The pressure applied to the hot air passages shall be 62 psig. The pressure loss
in the first 20 seconds shall not exceed 25 psig (172 kPa) (see 4.6.4.2).
Proof pressure. The heat exchanger shall withstand a proof pressure of 70 psig (483 kPa))
(see 4.6.5).
Burst pressure. The heat exchanger shall withstand a burst pressure of 117 psig (807 kPa) at
360 degrees Fahrenheit (°F) (182 degrees Celsius (°C)) (see 4.6.6).
Heat transfer. Heat transfer performance shall be not less than that shown in figure 1 (see 4.6.7).
Air pressure loss. The pressure loss shall not exceed that shown in figure 2 (see 4.6.8).
Leakage.
External leakage. A pneumatic pressure of 62 to 64 psig (427 to 441 kPa) shall be applied to the
hot air passages.
Internal leakage. A pneumatic pressure of 62 to 64 psig shall be applied to the hot air passages.
Proof pressure. The test pressure shall be 70 to 73 psig (483 to 503 kPa).
Burst pressure. The oven temperature shall be 360°F (182°C). The test pressure shall be 117 to
121 psig (807 to 834 kPa).
Heat transfer. To determine conformance to 3.5.4, the heat exchanger shall operate at each
combination of the steady state conditions specified in table VI. The measured hot air outlet
temperature shall be equal to or greater than that specified in table VI (see figures 1 and 2).
2
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