FIRE EXTINGUISHER SYSTEM - MAINTENANCE PRACTICES
Regular
maintenance of fire extinguisher systems typically includes such items as the
inspection and servicing of fire extinguisher bottles (containers), removal and
re-installation of cartridge and discharge valves, testing of discharge tubing
for leakage, and electrical wiring continuity tests. The following paragraphs
contain details of some of the most typical maintenance procedures, and are included
to provide an understanding of the operations involved.
Fire extinguisher system maintenance
procedures vary widely according to the design and construction of the
particular unit being serviced. The detailed procedures outlined by the
airframe or system manufacturer should always be followed when performing
maintenance.
Container Pressure Check
A pressure check of fire extinguisher
containers is made periodically to determine that the pressure is between the
minimum and maximum limits prescribed by the manufacturer. Changes of pressure
with ambient pressure must also fall within -prescribed limits. The graph
shown in figure 5.5 is typical of the
pressure/temperature curve graphs that provide maximum and minimum gage
readings. If the pressure does not fall within the graph limits, the
extinguisher container should be replaced.
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