What is a dry valve accelerator?

into the sprinkler piping of a dry pipe system: a) Accelerator – A device intended to induce dry pipe system air into a chamber of a dry. pipe valve to reduce the trip time. b) Exhauster – A device intended to discharge dry pipe air directly to atmosphere.”

How does a dry pipe accelerator work?

The most common are accelerators, which quickly sense rapid air pressure drops and push pressurized air into the dry valve to upset its differential faster. Exhausters discharge large amounts of pressurized air directly into the atmosphere instead of waiting for it to escape through the sprinkler.

What is the maximum allowable time for water to be delivered to an open sprinkler in a dry pipe sprinkler system?

15 seconds
​Dry systems must discharge water in 15 seconds, regardless of system size (NFPA 13 2002 11.2.

What is a dry valve?

A dry pipe valve is utilized on fire sprinkler systems in which there is a potential for the sprinkler system to be exposed to freezing conditions. Located in a heated space, the dry pipe valve prevents water from entering the pipe until a fire causes one or more sprinklers to operate.

How do you trip a dry system?

Open a valve on the system to release the air or nitrogen. Watch the system air or nitrogen gauge and document the pressure at which the dry valve trips. Immediately close tightly the system control valve and fully open the main drain valve.

How do you test a dry pipe for sprinklers?

What is a sprinkler trip test?

Sprinkler Systems Trip Tests Then every third year, NFPA 25 calls for a “full trip” of each dry pipe valve, which entails the control valve being fully open and recording of the time it takes water to reach the inspectors test connection.

What is the major advantage of dry pipe system?

The biggest advantage to having Dry Pipe Fire Sprinkler Systems is that there is no stagnate water in the pipes. This means that this is the perfect system for colder climates because it cannot freeze and rupture a pipe.

What are the components of a dry pipe sprinkler system?

To operate properly, a dry pipe valve requires a complex arrangement of piping, valves and switches. These components are known as the dry pipe valve “trim”. The additional control equipment and air pressure supply components increase the system complexity.