Why is a Siamese connection used?

Siamese connections are to be equipped with plugs or caps. This is to prevent dirt and other foreign objects from entering the piping, which would inhibit water flow or prevent the connection from being used during an emergency.

What is a fire department connection Clapper?

Clappers guide water through fire department connections Pressurized water moving through fire department connections can close built-in clappers. These clappers prevent water from exiting through open inlets. On an FDC with two or more inlets, clappers allow firefighters to add or remove hoses as needed.

How high can a fire department connection be off the ground?

Fire department connections ( FDC ) shall be located not less than 18 inches and no more than 48 inches above the level of the adjoining ground (NFPA 14 Section 6.4.

What does FDC on a building mean?

FDC stands for Fire Department Connection. This is a connection on the exterior of a commercial building where a responding fire department can attach a fire hose and pump water into the building’s stand pipe system supplementing the water pressure to the buidling’s sprinkler system.

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How does a Siamese valve work?

Siamese FDCs will contain either a single or double clapper to channel the flow of water coming into the system. If two hoses are connected, the equal pressure will cause the clapper in the middle of the body to let water flow in from each side. Double clappers provide greater control.

What is a post indicator valve?

What is a PIV? In short, post indicator valves (PIVs) are sturdy, above-ground access and operator valves used for automatic sprinkler systems and wet standpipe systems whose main water supply valves are located underground.

What psi do you pump a sprinkler system?

Water pressure is measured in pounds per square inch – also called psi. The average water pressure for most homes and businesses is between 30 psi and 50 psi; most sprinkler systems are designed to use pressures of around 30 psi.

What pressure do you pump a FDC at?

All pumpers will pump their capacity at 150 psi at the pump, so increase the throttle slowly until your discharge pressure is at 150 psi while being careful not to run away from your water supply. If your pumper is equipped with a multi stage pump, place the pump in the volume stage.

What pressure do you pump a standpipe at?

The minimum pressure while flowing the required standpipe flow (500 GPM from the hydraulically most remote standpipe and 250 GPM from each additional standpipe, up to a maximum of 1000 GPM for a fully sprinklered building) shall be 100 psi at any valve outlet while flowing 250 GPM through each valve.

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Is a PIV required?

Up until the 2010 Edition, NFPA 24 required a listed post indicator valve on every connection from a private fire service main to a building unless special criteria were met (NFPA 24 Section 6.3).

Where do I put the FDC sign?

Fire department connections should be marked by an approved sign mounted on the street front or on the side of the building. Such sign should have the ” FDC ” letters no less than 6 inches in height.

How far can an FDC be from a fire hydrant?

I. FDCs shall be no more than 150 feet from a public hydrant. The FDC may be located within 150 feet of a private hydrant if the FDC is connected to the fire sprinkler system by a dedicated pipe that connects on the system side (i.e., downstream) of the sprinkler system check valve.

What is FDC mean?

FDC

Acronym Definition
FDC Fire Direction Center
FDC Freedom from Debt Coalition (Philippines)
FDC Federal Detention Center
FDC Fault Detection and Classification

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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.

How does a standpipe work?

A standpipe is an open-ended, metal pipe that can be screwed into a basement floor drain to permit the flow of water back up as high as necessary, thereby delaying or preventing a basement flood.

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