Amerex 05604 - Manual (Page 4)

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COMPLETE MAINTENANCE – SIX YEAR TEARDOWN
[NFPA-10] Every six years, stored pressure extinguishers that require a 12 year hydrostatic test
shall be emptied and subjected to the applicable maintenance procedures. When the applicable
maintenance procedures are performed during periodic recharging or hydrostatic testing, the
six year requirement shall begin from that date.
WARNING:
a. Before attempting to delvalve the extinguisher for Maintenance, Hydrotest or Recharging
be sure that it is completely depressurized. Halon 1211 generates a vapor pressure of
22 psi @70°F. NEVER VENT TO THE ATMOSPHERE. Recover agent and vapor
according to the instructions below.
b. Never have any part of your body over the extinguisher while removing the valve
assembly.
c. Halon 1211 should not be mixed with even the slightest amount of moisture. Prolonged
exposure of a devalved cylinder to ambient air should be avoided to prevent moisture
contamination and cylinder rusting.
1. Complete items 1 through 9 in Maintenance/Service Procedure above.
2. Attach the appropriate recharge adapter to the extinguisher operating valve. Empty the
extinguisher of all pressure and Halon 1211 using a Getz HR-1 (or UL approved equal) Halon
Recharge/Recovery system and a bulk Halon supply cylinder with sufficient empty capacity to
accept the contents of the extinguisher.
NOTE: Every effort should be made to halt unnecessary escape of Halon 1211 to
the atmosphere to prevent detrimental environmental effect. High efficiency
Halon 1211 Recharge/Recovery (Vacuum Pump Type) Systems (UL Standard 2006)
are commercially available. The Getz HR-1 (UL approved) unit assures a minimum
of 99% recovery efficiency. It allows a means of checking for and removing
moisture or contamination during the recovery process.
3. When the extinguisher is empty of all agent and pressure, remove valve assembly and
disassemble by removing downtube, spring and valve stem assembly. Discard valve stem
assembly and collar o-ring.
NOTE: Keep cylinder opening covered while devalued to minimize interior
corrosion.
4. Thoroughly clean all parts of the disassembled valve with a soft bristle brush or soft cloth. Blow
the valve out with dry nitrogen.
5. Install a new Amerex valve stem assembly after lightly lubricating the valve stem o-ring with Visilox
711 (do not lubricate the valve stem seal). Reassemble the spring and downtube. Carefully install
a new collar o-ring which has been lightly lubricated with Visilox 711. Set the valve assembly
aside.
6. Inspect the cylinder interior following CGA Visual Inspection Standard C-6 and current NFPA 10
guidelines. If a hydrotest has been performed or any moisture is evident, the cylinder should be
immediately warm air dried.
7. Clean the o-ring seating groove in the cylinder neck. If any rust is evident, remove by using a fine
emery cloth (200 grit). Clean the surface and lubricate the entire sealing area with a thin film of
Visilox 711. Install the valve assembly in extinguisher cylinder. Hand tighten firmly.
8. Use the Getz HR-1 system to purge the residual air from the extinguisher cylinder.
9. Stand the extinguisher upright on a scale of sufficient size and capacity. Tare weight extinguisher
or record empty weight.
10. Follow all recharging instructions on Getz HR-1 or other UL Approved Recharge/Recovery system.