MIL-PRF-2939G
3.8 Reliability.
Reliability shall meet the specified values (see 6.2 and appendix C).
3.9 Workmanship. The cooling coils shall be free from defects that affect
appearance and operation.
3.10 Human engineering. The cooling coils
shall be arranged so as to achieve
safe, reliable, and effective performance
by the operator and maintenance
personnel and to optimize personnel skill
requirements. ASTM F-1166 may be
utilized as a guideline in applying human
engineering design criteria for the
cooling coils.
3.11 Maintainability. The cooling coils shall be constructed so that (see
6.2):
a.
The leading edges of the cooling elements can stand wire brushing for
cleaning without bending.
b.
Without bending of the cooling element or other damage to the cooling
coil, the coil can be cleaned by a pressure driven washer at
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pressures up to 1000 lb/in at a flow rate of 2.2 gallons per minute
using an environmentally safe cleaning mixture.
c.
The condensate system can be cleaned without disassembly of the
cooling coil.
d.
The cooling coil is drainable to prevent freezing when subject to air
below 32°F. The water shall drain to the cooling coil condensate
system.
e.
The cooling coil is capable of being vented of air. Any water coming
from the vent shall be collected by the cooling coil condensate
system.
3.12 General shipboard design conditions. General shipboard design
characteristics shall be as follows:
Entering dry bulb (DB) temperatures of 75°F minimum to 105°F maximum.
a.
Entering wet bulb (WB) temperatures of 59°F minimum to 102°F maximum.
b.
Entering chilled water temperature of 45°F.
c.
d.
Chilled water flow rate of 3.6 gallons per minute per ton of
refrigeration.
e.
Replenishment air introduced to duct type cooling coil is sea air at
40°F to 105°F dry bulb.
f.
The cooling coil shall perform, and condensate shall drain, without
degradation, when the coil is subjected to a permanent tilt of 15
degrees in any direction.
3.12.1
Shock. Unless otherwise specified in 6.2, cooling coils shall meet
the shock requirements of MIL-S-901 grade A, class I equipment.
3.12.2
Vibration. Cooling coils shall meet the environmental vibration
requirements of MIL-STD-167-1.
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