Which of the following describes a dry-pipe sprinkler system?
a. Air or nitrogen under pressure replaces water in sprinkler above valve, air escapes first when sprinkler activates
b. All sprinklers open all the time, no water in piping before activation
c. Contains water under pressure at all times, when initiated will immediately discharge water spray and activate alarm
d. Dry system that employs deluge-type valve, fire detection devices, and closed sprinklers
Answer: a. Air or nitrogen under pressure replaces water in sprinkler above valve, air escapes first when sprinkler activates
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