Page: 73
FM-200® OPERATION, DESIGN, & SERVICE MANUAL
Revision F
Document # DOC102
Issued: February 1, 2009
Revised: 11-Nov-2011
40YE
Section 6 System Inspection and Maintenance
6.2.1 Semi-Annual Maintenance
In addition to the monthly inspection steps, at least semiannually the agent quantity and pressure shall be
checked.
6.2.1.1 Pressure Check
Check the pressure indicated by the gauge and the temperature of the cylinder and compare with the Table
6.2.1.1 in Appendix B. If the gauge pressure is below the pressure shown in the “90% Pressure” column
for the temperature of the cylinder, the cylinder must be removed from service, agent recovered, all leaks
identied and repaired, and the cylinder relled.
6.2.1.2 Liquid Level Indicator
e liquid level indicator may be used in the Mv and Lv Series Systems to approximate the ll weight of a
cylinder without having to disconnect the cylinder.
e ambient temperature of the cylinder must rst be measured before obtaining a measure with the liquid
level indicator. Make certain the cylinder is stored at this temperature for at least 24 hours to ensure an
accurate reading.
Remove the protective cap on the liquid level indicator and slowly pull the tape until the magnet engages.
Record the measurement on the tape to the nearest eighth of an inch. Consult the graphs located in
Appendix B of this manual and use this measurement along with the ambient temperature to determine
the approximate weight of the cylinder contents. If the weight determined from this graph shows a 5% or
greater loss from the ll weight stamped on the cylinder label, the cylinder must be weighed to conrm
these readings. See Section 6.2.1.2 for instructions on weighing.
[Note: e weight values indicated on the graphs located in Appendix B may show ll weights less than or
greater than the Listed/Approved lls weights (capacities) shown in Table 2.1.1 "Cylinder Capacities" on
page 6 of this manual. Do not exceed or underll the cylinder capacities noted in Table 2.1.1.]
Once measurement is recorded, replace the tape in the liquid level indicator. First pull the tape until the
magnet disengages and then slide it back into the cylinder. Make certain the cap is replaced.
6.2.1.3 Cylinder Weighing
e cylinder shall be weighed on a calibrated scale and the weight compared to the weight stamped on the
cylinder label. When weighing the cylinder the anti-recoil safety plug or device must be installed in the
discharge outlet and the electric or pneumatic valve actuator must be removed from the cylinder valve and
the shipping cap installed on the top of the valve.
e maximum weight loss allowed is 5% of the ll weight (agent weight).
Example: A 130 lb (59.0 kg) cylinder lled with 76 lb (34.5 kg) of agent with a total weight stamped on the
cylinder label of 163 lb (73.94 kg) can have a maximum loss of 3.8 lb (1.73 kg) or 5% of 76 (5% of 34.5).
If the agent weight is below 72.2 lb (32.77 kg) or the total cylinder weight is below 159.2 lb (72.21 kg)
(163 – 3.8) (73.94 – 1.73) the cylinder must be removed from service, agent recovered, all leaks identied
& repaired, and the cylinder relled.
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