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NOTE: This is an unformatted excerpt from our online fire protection training library.

Supervisory Initiating Devices

Introduction

Supervisory Initiating Devices

At 3:30 p.m., the remote annunciator in the maintenance shop began to sound. Investigating the signal, a maintenance technician saw that a signal was received from the dry-pipe sprinkler system in the warehouse. He went to the warehouse, and found that at some point in the recent past, the air compressor for the dry-pipe sprinkler system had been turned off. A very small amount of air leakage from the dry-pipe sprinkler system caused the air pressure to drop 10 psi below the normal pressure maintained in the system. If the pressure continued to drop, the valve would eventually trip, flooding the system with water. Fortunately, the maintenance technician restored power to the air compressor before the dry-pipe sprinkler system tripped.

The pressure switch that actuated when the air pressure in the dry-pipe sprinkler system dropped is a supervisory initiating device.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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