초록 ▼

A gas charged fluid flow line of a dry pipe sprinkler system is continuously monitored to detect rate of loss of pressure (dp/dt). The rate of pressure loss is used to detect whether there is an open sprinkler head in a sprinkler grid of the system. Detection of an open sprinkler head and opening of

A gas charged fluid flow line of a dry pipe sprinkler system is continuously monitored to detect rate of loss of pressure (dp/dt). The rate of pressure loss is used to detect whether there is an open sprinkler head in a sprinkler grid of the system. Detection of an open sprinkler head and opening of a dry valve may occur in a matter of a few seconds, allowing for a quick response to a fire condition and accurate discrimination of a pressurized gas leak condition. The system may operate at charge pressures in the range of about 7 psig to about 15 psig.

대표청구항 ▼

[ We claim:] [1.] A method of operating a dry pipe sprinkler system, the method comprising monitoring the charged fluid flow line by:(a) sensing pressure in a gas charged fluid flow line of the system and generating a signal representing instantaneous gas pressure in the fluid flow line;(b) calculat

[ We claim:] [1.] A method of operating a dry pipe sprinkler system, the method comprising monitoring the charged fluid flow line by:(a) sensing pressure in a gas charged fluid flow line of the system and generating a signal representing instantaneous gas pressure in the fluid flow line;(b) calculating a rate of change of the instantaneous gas pressure;(c) comparing the rate of change to a predetermined negative rate of change value; and(d) outputting an open sprinkler head signal if the rate of change is more negative than the predetermined negative value, thereby detecting sprinkler openings in the system.