NFPA 17A-1998 Standard for Wet Chemical Extinguishing Systems.
1-1* Scope. 1-1.1 The provisions of this standard apply to the design, installation, operation, testing, and maintenance of pre-engi- neered wet chemical fire extinguishing systems that discharge wet chemical from fixed nozzles and piping by means of expel- lant gas. Minimum requirements are specified for restaurant, commercial, and institutional hoods, plenums, ducts, and associated cooking appliances. 1-2 Purpose. This standard is prepared for the use and guid- ance of those charged with the purchasing, designing, install- ing, testing, inspecting, approving, listing, operating, or maintaining of pre-engineered wet chemical fire extinguish- ing systems in order that such equipment will function as intended throughout its life. Nothing in this standard is intended to prevent the use of new methods or devices, pro- vided sufficient technical data are submitted to the authority having jurisdiction to demonstrate that the new method or device is equivalent in quality, effectiveness, durability, and safety to that prescribed by this standard. 1-3* Qualifications. Only persons properly trained shall be considered competent to design, install, and service pre-engi- neered wet chemical systems. 1-4 Retroactivity Clause. The provisions of this document are considered necessary to provide a reasonable level of protec- tion from loss of life and property from fire. They reflect situ- ations and the state of the art at the time the standard was issued. Unless otherwise noted, it is not intended that the provi- sions of this document be applied to facilities, equipment, structures, or installations that were existing or approved for construction or installation prior to the effective date of this document. Exception: In those cases where it is determined by the authority hav- ing jurisdiction that the existing situation involves a distinct hazard to life or property, applicable portions of this standard shall apply to control the distinct hazard(s).
2-3.1.3* Discharge nozzles shall be permanently marked for identification. 2-3.1.4 All discharge nozzles shall be provided with caps or other suitable devices to prevent the entrance of grease vapors, moisture, or other foreign materials into the piping. The protection device shall blow off, open, or blow out upon agent discharge. 2-4 Operating Devices. 2-4.1 Operating devices shall be listed. 2-4.1.1 Operating devices shall be designed for the service they will encounter and shall not be rendered inoperative or susceptible to accidental operation. 2-4.1.2 Operating devices shall be designed to function properly through a minimum temperature range from 32°F to 120°F (0°C to 49°C) or marked to indicate their temperature limita- tions.
NFPA 17A pdf download.