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POST-DISCHARGE MAINTENANCE
General Information
Liquid Fire Suppressant, the Aqueous Potassium Carbonate (APC) base wet chemical used in the EWC
extinguishing system, is non-toxic. However, any food or cooking oils that have been contaminated with
wet chemical agent should be discarded. Refer to Safety Data Sheet (SDS).
After any system discharge, it is best to clean the area as soon as it is safe to do so. Prolonged exposure
of equipment to wet chemical can result in localized corrosion due to moisture in the air. Clean up should
be completed within 24 hours of any system discharge.
EWC cylinders need to be recharged or replaced every 12 years, and after any system discharge.
Appliance Cleanup
No unusual cleanup procedure is required. The reaction of the wet agent and the grease is one of
saponification, and it produces a foam that can be wiped off. After the appliances have completely cooled,
the residue from the discharge may be cleaned up using a wet cloth or sponge. Ensure that all fuel and
electric power to the area has been shut down. Wear rubber gloves and eye protection while cleaning. If
skin or eyes come in contact with the agent, flush thoroughly with water.
Cleaning Distribution System
The EWC extinguishing system must have all discharge piping and nozzles flushed out with water after
any discharge, as detailed in the following procedures.
Cleaning Nozzles
1. Remove all nozzles from the system.
2. Inspect each nozzle & filter and remove any debris. Remove nozzle caps.
3. Clean nozzle and strainer by flushing thoroughly with warm soapy water. Remove any foreign matter
that could impede flow.
4. Run water through the nozzle tip to ensure the orifice is not clogged.
5. Thoroughly dry nozzles with dry air or nitrogen and set aside.
WARNING!
Do not disturb the foam until the cooking appliances, plenum, and duct have cooled sufficiently.
Do not put water on hot grease as this will cause violent steaming and spattering.
WARNING!
APC wet agent is electrically conductive. To avoid electrical shock, de-energize all electric circuits
to appliances, outlets, and wiring by disconnecting or turning off the electric power at the main
fuse or circuit breaker box. Do not cleanup APC wet agent or touch electric appliances, outlets,
power cords, or other wiring with electric power on.
Summary of Contents for EWC
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