Insulation. Insulation shall be non-asbestos composition. Apply
insulation to conserve energy, provide comfort, and ensure safety. Thickness
of insulation is primarily an economic comparison for energy conservation.
This is done by comparing the value of heat lost through insulation to the
cost of additional thickness over the expected life of the insulation. In
areas where a reliable fuel supply is questionable, insulation may be
Boiler Casing. The exterior casing temperature of shop assembled
and field erected boilers shall not exceed 150 degrees F (83.3 degrees C)
under the following design conditions:
Boiler operating at maximum rated capacity,
Ambient temperature of 100 degrees F (37.8 degrees C),
Air velocity of 2 ft/sec (0.61 m).
The above casing temperature is a factor in the guaranteed plant
efficiency at various operating loads. Lower casing temperatures may be
required when justified economically.
Brick-set, firebox or other field insulated units shall be covered
with a metal finish to protect the insulation. Outside casing temperature
shall not exceed that specified for shop assembled and field erected units.
Additional insulation may be used if justified economically.
Hot Water Piping. Hot water piping, above 150 degrees F (65.6
degrees C), shall be insulated for safety and conservation of energy. Refer
to MIL-STD-101B, Color Code for Pipelines for Compressed Gas Cylinders, table
2 for piping color code of different temperature piping.
Steam and Hot Condensate Piping. This piping shall be insulated
for safety, area comfort, and conservation of energy. Additional insulation
may be used if justified economically.
Location. All piping inside the plant building shall be above
ground or in covered accessible trenches. This handbook does not cover
exterior distribution piping. Exterior distribution piping requirements for
utility steam, HTW, CHW, natural gas, and compressed air systems are provided
in MIL-HDBK-1003/8. Piping of no. 4 to no. 6 fuel oil and other liquids shall
be heat traced and insulated. No. 6 fuel oil lines shall be insulated to
maintain pumping temperatures.