MIL-HDBK-1027/1B
(5) In accordance with requirements of NFPA 58,
LP gases are effectively odorized to positively indicate
presence of gas down to concentration in air of not over
one-fifth the lower explosive limit.
(6) The pressure exerted by propane gas in a
container is entirely dependent upon the temperature of the
contents. Excessive pressure may be relieved by discharging gas
from above the liquid thus reducing the temperature of the
liquid or by application of a cooling agent to the outside of
the container. In the interest of safety, it is preferable to
reduce the temperature of the liquid rather than permit the
escape of high pressure gas with resultant potential hazard.
b)
Propane data as listed in NFPA 58:
Total heating value after
vaporization:
25 140 kJ/L (liquid)
92 430 kJ/cu. m
50 000 kJ/kg
.271 cu. m of vapor per L of liquid at
15.56 degrees C
Vapor pressure in kPa at:
20 degrees C
895
40 degrees C
1482
55 degrees C
1980
Specific gravity of liquid at
15.56 degrees C:
0.504
Initial boiling point at 1.00 atmosphere,
degrees C:
-42
Flammability limit, percent of propane gas in air:
Lower
2.15
Upper
9.60
c) The design of the fuel system should be in
accordance with NFPA 54, National Fuel Gas Code and NFPA 58 and
NAVFAC Design Manual DM-22, Petroleum Fuel Facilities. NFPA 58
covers the LP gas system including the container, the vaporizer,
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