MIL-PRF-62259B
3.2.1 Recycled, recovered, or environment preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided the
material meets or exceeds all specified requirements and promotes economically advantageous life
cycle costs.
3.3 Operating requirements.
3.3.1 Heat transfer capacity. The heat transfer capacity, based on the unobstructed area
of the core, shall not be less than shown on figure 1.
3.3.2 Air flow resistance. The maximum static air flow resistance shall not be more than
that shown on figure 1.
16000
7.0
6.5
14500
6.0
5.5
13000
5.0
BTU/MIN/100 DEG F CHANGE
4.5
11500
4.0
AIR RESISTANCE
10000
3.5
3.0
2.5
8500
2.0
1.5
7000
1.0
.5
5000
0
500
1000
1500
2000
2500
AIR FLOW \ LBS \ MIN (FACE VELOCITY) (AIR CORRECTED TO 0.075 LBS / CU. FT.)
FIGURE 1. Btu rating of radiator.
3.3.3 Coolant flow resistance. The maximum coolant flow resistance at 94 gallons per
minute (gal/min) (5.9 liters per second (L/s)) coolant flow rate shall not be more than 3.0 pounds
per square inch (psi) (20.7 kilopascal (kPa)).
3.3.4 Pressure cycle. Radiators shall withstand a minimum of 10 000 air pressure cycles
at 6 cycles per minute without rupturing or leaking.
3.3.5 Pressure capacity. Radiators shall withstand an internal pressure of 18 pounds per
square in gauge (psig) (124.1 kPa) for a period of not less than 0.5 minute (or approved alternate
3
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