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904.6.6 Halon systems.
Lawfully existing halon systems shall be maintained in accordance with FC 901.6.1, 904.5 and 904.6.6.1 through 904.6.6.3. All other halon systems shall be removed in accordance with FC 904.1.4.2.
904.6.6.1 Containers.
The extinguishing agent quantity and pressure of containers shall be checked at least on a semiannual basis. Where a container shows a loss in original weight of more than 5 percent or a loss in original pressure (adjusted for temperature) of more than 10 percent, the container shall be refilled or replaced. The weight and pressure of the container shall be recorded on a tag attached to the container.
904.6.6.2 System hoses.
System hoses shall be examined at 12-month intervals for damage. Damaged hoses shall be replaced or tested. At 5-year intervals, all hoses shall be tested.
904.6.6.2.1 Test procedure.
For Halon 1301 systems, hoses shall be tested at not less than 1,500 psi (10 343 kPa) for 600 psi (4137 kPa) charging pressure systems and not less than 900 psi (6206 kPa) for 360 psi (2482 kPa) charging pressure systems. For Halon 1211 hand-hose line systems, hoses shall be tested at 2,500 psi (17 238 kPa) for high-pressure systems and 900 psi (6206 kPa) for low-pressure systems.
904.6.6.3 System components.
System components, such as switches, door and window releases, interconnected valves, damper releases and supplementary alarms, shall be manually operated at 12-month intervals to ensure such components are in proper operating condition.
904.6.7 Water mist systems.
Water mist systems shall be maintained in accordance with FC 901.6.1, 904.5 and NFPA 750, as modified by FC Appendix B.
904.6.8 Wet chemical systems.
Wet chemical systems shall be maintained in accordance with FC 901.6.1, 904.5 and 904.6.8.1 through 904.6.8.3.

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