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Inspection and Maintenance
System Package Lagging
The joints in the lagging panels, roof, doors, and base should be inspected for tightness. If the joints are
not tight, the loss of medium will be too great to be replenished. The concentration will not buildup inside
the compartments to the required value. The easiest way to make the inspection is to stand inside each
compartment on a bright, sunny day with the lights off. No light should be visible through the joints.
Particular attention should be paid to all doors. The joint between the generator compartment and the
back side of the exhaust plenum, plus the joint between the generator and the turbine base should be
checked in particular. In general, joints which are not tight should be fitted with new gaskets. Doors can
be tightened by adjusting the striker plates.
High Pressure System
The fire protection system should be visually inspected to see that it is in proper working order. The pres-
sure gauges on the pilot-operated cylinders should be checked to be sure the cylinders are at the proper
pressure. The pressure is dependent on the cylinder temperature. For carbon dioxide, at 50 F (10 C) the
pressure should be about 650 psig (44.8 bars); at 70 F (21 C) about 840 psig (57.9 bars); at 105 F (41 C)
about 1250 psig (86.2 bars ). For Halon 1301, at 50 F (10 C) the pressure should be about 530 psig (36.5
bars); at 70 F (21 C) about 600 psig (41.4 bars); at 105 F (41 C) about 750 psig (51.7 bars). Check the
dampers to ensure they are unobstructed and properly latched.
High Pressure Storage Cylinders
Disconnect the discharge heads from all cylinders and the solenoid pilot valve assemblies from the pilot
cylinder. Weigh each cylinder. If a cylinder shows more than 10 percent loss in net weight, it should be
refilled, or replaced.
The empty and full weights of all cylinders are permanently stamped on the cylinder valve bodies. Each
time the cylinders are weighed, the date and net weight should be recorded on the attached tag.
Fire Detectors
The temperature setting of the detector is stamped on its identification plate. It is not possible to accurate-
ly check the calibration of the detector. If it is suspected that a detector is out of calibration, it should
be replaced.
CAUTION
If the fire detectors are checked in place, without removal
from the system, the discharge heads must be removed
from the medium cylinders to disarm the high pressure
system. The isolation valve must be closed in the low pres-
sure control cabinet to disable the low pressure system.
Inspection and Maintenance Procedures
IMP–15
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