4
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.
NOTE: Some states have legislation which requires "Complete Maintenance" on an
annual basis. Please contact your local Amerex Distributor to see if these requirements
apply to you.
1.
Discharge chemical and pressure into a "closed" dry chemical recovery system (several are
commercially available). Make sure that the extinguisher is completely empty and depressurized.
NOTE:
A "closed recovery system" is designed to prevent loss of the chemical "fines".
Loss of the "fines" could result in reduced extinguisher efficiency.
2.
Clean extinguisher to remove dirt, grease or foreign material. Check to make sure that the
instruction nameplate is securely fastened and legible. Inspect the cylinder for corrosion, abrasion,
dents or weld damage. If any of these conditions are found and you doubt the integrity of the
cylinder, hydrostatically test to factory test pressure marked on the nameplate (label), using the
proof pressure method, in accordance with CGA C-1 and NFPA 10.
NOTE:
When cleaning, avoid use of solvents around the pressure gauge. They could
seriously damage the plastic gauge face.
3.
Inspect the extinguisher for damaged, missing or substitute parts. ONLY FACTORY
REPLAEMENT PARTS ARE APPROVED FOR USE ON AMEREX FIRE EXTINGUISHERS.
4.
Check the date of manufacture on the extinguisher label (nameplate). Cylinder must be
hydrostatically (proof pressure) tested every 12 years to the test pressure indicated on the
nameplate.
5.
Visually inspect the pressure gauge
– if bent, damaged or improper type or pressure – replace with
the proper Amerex pressure gauge (see Parts List).
6.
Check ring pin for freedom of movement. Replace if bent or if removal appears difficult.
7.
Inspect discharge lever for any dirt or corrosion which might impair freedom of movement. Inspect
carrying handle for proper installation. If lever, handle or rivets are damaged, replace with proper
Amerex parts.
8.
Remove nozzle or hose and horn assembly and visually inspect threads on nozzle or house
coupling, horn and hose for damage, and replace as necessary. Blow air through nozzle or hose
and horn to insure passage is clear of foreign material.
9.
Inspect the valve assembly for corrosion or damage to nozzle or hose thread connection. Replace
valve assembly or component parts as necessary.
WARNING:
Before attempting to disassemble the extinguisher be sure it is completely
depressurized.
10.
Remove and disassemble valve assembly by removing downtube, spring and valve stem
assembly. Remove collar o-ring from valve.
11.
Complete steps 3 through 14 of Recharge Procedure.
