What are fire department connections 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.

What is dry standpipe?

Dry standpipe Dry standpipes are not filled with water until needed in fire fighting. Fire fighters often bring hoses in with them and attach them to standpipe outlets located along the pipe throughout the structure. This type of standpipe may also be installed horizontally on bridges.

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.

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.

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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.

What does FDC mean?


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


What is the most common standpipe system?

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

What is a Class 3 standpipe?

Class III – A Class III standpipe system shall provide 1 1/2 inch hose stations to supply water for use by trained person- nel and a 2 1/2 inch hose connection to supply a larger volume of water for use by fire departments and those trained in heavy fire streams.

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 a sexless coupling?

The sexless coupling comprises an internally threaded collar portion disposed about an axis and having a first end section and a second end section, the first end section being adapted to receive an externally threaded neck of a fire hydrant outlet.

What pressure do you pump a sprinkler system?

Setting the fire department pumper engine pressure 50 psi below the building system pressure will allow the building pump to stay running and do the job as long as it can. A pressure drop in the system of more than 50 psi is a good indication of a substantial amount of water flowing.

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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 type of heat detector must be replaced after activation?

1. Nonrestorable fixed-temperature, spot- type heat detectors are required to be replaced after 15 years from initial installation [see NFPA 72(10), Table 14.4.

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 is a FDC check valve?

The most common component associated with a check valve is the FDC (Fire Department Connection). The fire department uses this as a means to help provide water to the sprinkler system in case of a fire.

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