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Chapter 3 — System Design Page 3 -1 REV. 3 CHAPTER 111 SYSTEM DESIGN General Choosing the Proper Type of System PYRO -CHEM Industrial Open Face Paint Spray Booth Fire It is necessary for the system designer to consider the Suppression System has been designed and tested for use physical characteristics and layout of the hazard area to in open face paint spray booth applications. The guidelines ensure proper protection. The hazard area must meet the listed in this chapter deal with the limitations and parame- criteria for a particular system for that system to be effec- ters of various system configurations. It is the responsibility tive. The hazard area must be protected in accordance with of the Certified installer to ensure that the proper system NFPA 17 for proper protection. The following guidelines are design is being utilized, and that the system meets the limi- used to determine the proper system for a hazard: tations and parameters listed in this chapter. Before attempting to design any system, it is necessary to attend a Local Application — Overhead — This system is used for Factory Certification Training Class and become Certified to applying agent to an area from above the area. The maxi - install PYRO -CHEM Industrial Open Face Paint Spray mum nozzle height for overhead protection is 10.5 feet for Booth Fire Suppression Systems. ABC coverage. Total Flooding — This system is used to fill a volume with Choosing the Proper Agent agent to protect any hazard within that volume. Total flood - It is necessary for the system designer to consider the com- ing systems require that an enclosure be present around bustible material found in the hazard area to ensure proper the hazard area to allow the system to build up the proper protection. The agent used in the system must be approved concentration of agent within the hazard area. for the hazard class of the combustible material. The follow- ing are the hazard classes: The PYRO -CHEM Model N -SCR screening nozzle has been tested and approved by Underwriters Laboratories for "A" Class — Ordinary solid carbonaceous combustibles. unclosable openings. The nozzle will protect an area eight These include wood, paper, cloth, fiberglass, and plastics (8) feet wide at a height of twelve (12) feet. "B" Class — Flammable liquids and gases. These include • There is no limitation as to the percentage of unclosable paints, solvents, gasoline, oils, and hydraulic fluids. • opening. "C" Class — Electrical appliances. These include comput- The ventilation system must be shut down before or simul- ers, power generators, and power transformers. taneously with the discharge of the system. "D" Class — Combustible metals such as sodium, potassi- um, magnesium, titanium, and zirconium. The PYRO -CHEM Total Flooding Industrial Open Face Paint Booth Fire Suppression System a. Cylinders: is not intended to protect Class D hazards. The Models PCI- 15ABC, PCI- 25sABC, PCI- 35ABC, PCI- 50sABC, and PCI -70ABC cylinders can be used for The following guidelines should be used for determining the open face paint spray booth applications. proper agent: b. Nozzles: ABC (monoammonium phosphate- based) — for use with Four nozzles are available for use in protecting open face all "A," "B," and "C" Class hazards. paint spray booths: As per NFPA 17, pre- engineered dry chemical systems are Nozzle Application not approved for deep- seated or burrowing fires (such as ordinary combustibles where the agent cannot reach the N -SCR Screening the opening point of combustion), or on chemicals that contain their own N -OTF Work Area (Overhead Position) oxygen supply (such as cellulose nitrate). Do not mix differ- N -PLU Plenum Area (Overhead Position) ent types of agents, or agents from different manufacturers. N -DCT Duct Chemical reactions may occur when incompatible chemicals are mixed. Keep in mind that the agent must be accept- C. Temperature Range: able to the Authority Having Jurisdiction. The operating temperature range for open face booth appli- cations is 32 °F. to 120 °F. (0 °C. to 48 °C.). ULEX 3437 CEx732 September 1, 2006