MIL-HDBK-1027/1B
installed and maintained properly, the rotogauge will give you a
true reading.
z) The firefighting training facility will have a
24-hour propane detection system provided by the device
contractor. Refer to par. 2.6.a). The facility contractor is
required to interface with the detection system via the data
terminal cabinet (DTC) as follows:
(1) For 19F series trainers, provide an alarm
system to alarm by sound and flashing warning sign at the
quarterdeck or other 24-hour duty station. The warning sign
should state "DANGER - PROPANE ALERT."
(2) For 21C12 series and Seawolf trainers, refer
to par. 3.12 for requirements.
(3) In addition to propane alarms, the 24-hour
duty station should be equipped with remote shutoff capability
of propane from storage tanks and vaporizers.
2.2.3.2
Natural Gas. Natural gas is largely methane but
includes ethane, propane, and butane. It has two disadvantages
in regards to its use as a fuel for 19F series devices. First,
the device would have to be modified. Natural gas has less than
one-half of the Btu content of propane based on heating value of
93 MJ/cu. m of propane and 37 MJ/cu. m of natural gas.
Therefore, pipes, nozzles, and other components, would have to
be larger to accommodate the increased flow rate. The flame
characteristics so important to realism also would be different.
Additionally, natural gas is lighter than air, with air having
specific gravity equal to 1, natural gas has a specific gravity
between .58 and .70. Trainer architectural and safety aspects
would have to be redesigned for this lighter than air hazard.
Second, tests have not been run to determine the effect that
using natural gas would have on the training environment.
Therefore, natural gas cannot be used for the device training
fires. Natural gas, however, can be used as heating fuel.
2.2.3.3
Oil and Gasoline. Oil and gasoline are no longer
preferred as firefighting school fuels. These liquid
hydrocarbon fuels produce many kinds of air and water pollution
which can only be partially treated at great cost and may not be
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