- What is the purpose of a water motor gong?
- How does a water motor gong work?
- When the water flows the alarm sounds What does it mean?
- Can water flow alarms be silenced?
- Is photo cell used in fire alarm?
- How do deluge valves work?
- What is the purpose of an outside stem and yoke valve?
- What is a fire riser used for?
- How big does a fire riser room need to be?
- What does a riser do?
- What occurs when a fire alarm is activated?
- How does a fire riser work?
What is the purpose of a water motor gong?
The water motor gong is a large, wall-mounted bell that uses a clapper attached to a paddle wheel to make it ring.
This month’s reader questions focus on sprinkler alarms..
How does a water motor gong work?
When a sprinkler operates, water flows through the check valve and pushes the clapper open. Water then enters into the alarm line and will activate an alarm pressure switch or a water motor gong, sending a signal that there is water flowing in the system. … It is used when there is variable pressure in the water supply.
When the water flows the alarm sounds What does it mean?
When the water flow alarm sounds, this indicates that: Water is flowing in the system. Automatic sprinklers enhance occupant safety because they: Discharge water directly on the fire while it is still small.
Can water flow alarms be silenced?
A. One exterior approved audible device located directly above the FDC or other approved location. B. The exterior audible device shall sound upon water flow switch activation only and shall not be silenced until the water flow switch has been reset.
Is photo cell used in fire alarm?
The photocell output is being used to initiate an alarm. In the Light obscuring smoke detector, smoke interferes with a light beam between a light source and photocell. … Carbon Monoxide fire detectors use the same type of sensor as those in the home but are more sensitive and respond more quickly.
How do deluge valves work?
A deluge fire protection system has unpressurized dry piping and open sprinkler heads. The system is directly connected to a water supply and when the system is activated, a deluge valve will release the water to all the open sprinkler heads. The valve is opened when activated by a heat or smoke detection system.
What is the purpose of an outside stem and yoke valve?
One type of valve commonly used to control water flow to fire sprinkler systems is known as an OS&Y gate valve. OS&Y means “outside stem and yoke” or “outside screw and yoke”. OS&Y gate valves operate by opening and closing via a gate, which lowers into or rises out of the valve.
What is a fire riser used for?
Fire riser is a component of the fire suppression system. It is a pipe connected to a pressurized water source which supplies water to the sprinkler system in the building. It is where the gauges, valves, and alarm devices are located.
How big does a fire riser room need to be?
So provide yourself 9 ft² for the fire riser and at least 3 ft of space in front of that valve. Or 18 ft² total. (Refer to Image 1 above). Maybe your building is constructed of wood and has an attic that requires fire sprinkler protection.
What does a riser do?
A riser, also known as a feeder, is a reservoir built into a metal casting mold to prevent cavities due to shrinkage. Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify.
What occurs when a fire alarm is activated?
When the fire alarm system is activated, the following will occur: A. The bells will sound alerting building occupants of emergency conditions. … Notification of the testing will be posted by the building engineer at each building entrance and in the elevators on the day of the fire alarm test to inform occupants.
How does a fire riser work?
As a fire sprinkler discharges, water flows out of the pipe, or branch line, it’s connected to. When that happens, water moves through the system riser to refill the branch line. These changes in flow and pressure are monitored at the riser by electronic devices called water flow switches.