The spray chamber system utilizes numerous features to address the hazardous
conditions which can be present when alcohol is utilized. These features are
incorporated into a safety control panel and include the following:
1. Gaseous nitrogen supply to provide a non-flammable vapor space inside the
alcohol supply tank (approximately 2 psi) with overpressurization protection to
prevent vapor pressures exceeding 10 psi.
2. The alcohol plumbing system is equipped with redundant valves to provide
system isolation and emergency shutdown capabilities. Check valves are installed
to prevent backflow or siphoning. Flow indicator sensors are also included to
provide remote monitoring of leaks and/or pressure losses. Relief valves are
also used to prevent overpressurization.
3. Electrical continuity from the alcohol storage tank to the chamber spray
nozzle is maintained to mitigate static electricity/streaming hazards asso-
ciated with flowing flammable materials. The spray chamber is also grounded to
facility ground and the chamber window has a conductive coating for static
4. All electrical components inside the spray booth chamber are NFPA Class 1
Division 1 for hazardous environments.
5. Fire suppression for both the alcohol storage tank site (sensor controlled
standard water sprinkler heads) and alcohol spray booth (IR/UV sensor controlled
CO2 system) is included.
6. The spray booth is explosion vented.