scope:

This standard applies to systems for protection of ducting, conveyors or chutes used in pneumatic materials handling systems and most often used in the woodworking and textile industries. Other installation types may also be applicable. Spark radiation detectors are mounted to view in the duct to sense ignition sources. These detectors send signals to a control device, which in turn actuates a valve for a predetermined extinguishing cycle. The valve supplies one or more water-spray nozzles mounted downstream of the detectors; the water discharge is timed to ensure suppression of the ignition source and the material shortly before and after the particle. Because such a system is intended only for protection from a specific hazard, it should not be considered a substitute for general fire protection, including appropriate sprinkler protection.

These are complicated systems which require careful installation. Many factors, including particle velocity, the radiation characteristics of heated particles, and the ignition energy requirements of the material in dust form affect the ability of this system to protect the property. The manufacturer's instructions should be followed carefully. Access for service must be provided near the detectors and near the water spray nozzles and a regular program of maintenance and testing should be established.

Spark Extinguishing Systems are typically considered as a special hazards protection or process protections and would not in itself cause a building evacuation. They may connect to the existing Protected Premises Fire Alarm System for additional evacuation capability although this is not common.

This standard provides the operating basis for the complete Spark Extinguishing System, including the alarm initiating (spark detectors), alarm signaling processing (control unit) as well as the water-spray or extinguishing sets for use in ordinary dry locations. It does not by itself cover the use in damp, wet or hazardous (classified) locations (other standards apply). This equipment covered by this standard, may be combined with additional standards for use in other areas.

This standard considers applications involving the detection and extinguishing of small wood, fiber and metal combustibles with spark sensing detectors during the transport of particulate solid materials through pneumatic conveyor ducts within a 8 in. to 118 in. (0.2 to 3.0m) diameter or mechanical conveyors with velocities ranging from 200 to 10,000fpm (1-50mps).

Operation outside of theses parameters is possible with additional testing and would be indicated in the product listing for the particular system.

Purpose

This standard states testing and certification requirements for Spark Detection and Extinguishing Systems.

Testing and certification criteria may include, but are not limited to, performance requirements, marking requirements, examination of manufacturing facility(ies), audit of quality assurance procedures, and a surveillance program.