What is a fire department connection used for?

The Fire Department Connection, also commonly known as the siamese connection, is an important component found on most sprinkler and standpipe systems. When a fire sprinkler system activates, the FDC provides a means for firefighters to connect hose lines to supplement the fire sprinkler system’s domestic water supply.

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.

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.

Are standpipes required?

In addition, standpipes are required in high-rise buildings and some stage areas in assembly occupancies. Some occupancies also mandate the presence of standpipes, such as detention and correctional occupancies, airport terminals and piers, at certain thresholds.

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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.

What is an FDC sign?

Fire Department Connection ( FDC ) signs allow for fire department personnel to easily determine the location of a building’s water supply port in event of a fire. Glow-in-the-dark signs ensure the fire department can easily find connections during an emergency or blackout.

Which is the most common type of FDC connection?

One of the most common FDCs, known as a Siamese or two-way connection, has two 2 1/2-inch female swivel connections. NFPA requires that all fire department connections use 2 1/2″ National Hose (NH) threaded female couplings unless the authority having jurisdiction designates another specific connection type.

What type of sprinkler system is not required to have a fire department connection?

A fire department connection ( FDC ) is required for most NFPA 13 and 13R automatic sprinkler systems and standpipe systems. They are not required for automatic sprinkler systems protecting one- and two-family dwellings and townhomes.

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.

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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.

How do Siamese connections work?

Inspired by the Y-shaped Siamese twins, a Siamese connection is a Y shaped fire department connection with two female inlets through which firefighters can attach two hoses and refill standpipes or sprinkler systems with water. The siamese connection is alternatively called FDC ( Fire Department Connection ).

What 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.

What are the five types of standpipe systems?

Types of standpipes in combination systems

  • Automatic dry standpipe system.
  • Automatic wet standpipe system.
  • Combined system.
  • Manual dry standpipe system.
  • Manual wet standpipe system.
  • Semiautomatic dry standpipe system.
  • Wet standpipe system.

What is the most common standpipe system?

A “Class I” standpipe is the most common type of fire protection standpipe system today.

What psi do you pump a standpipe?

Therefore, the minimum hose valve outlet pressure at 250 GPM total standpipe flow is 100 psi, and the minimum hose valve outlet pressure at the maximum standpipe flow is 100 psi.

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