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 a siamese connection and why is it used?
A siamese connection or splitter in fire protection engineering is a pipe fitting that allows two or more fire hoses to be connected to a single standpipe riser at the same general location. It is so-called due to the visual similarity to siamese twins.
What is a fire department connection Clapper?
Clappers guide water through fire department connections
On an FDC with two or more inlets, clappers allow firefighters to add or remove hoses as needed. If the flow of water to one hose stops (or a hose bursts) a clapper will close to prevent backflow.
How do Siamese connections 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 fire department valve?
What is a Fire Hose Valve? A hose or hydrant valve is used to control the flow of water at the scene of a fire or in an industrial setting. Different applications call for different fire hose valves, including deluge and dry riser valve types.
What is the purpose of a standpipe?
Standpipe systems are a series of pipes which connect a water supply to hose connections, basically an extension of the fire hydrant system. They are designed to provide a pre-piped water system for building occupants or the fire department.
What is the purpose of a post indicator valve?
Installed in the main water line serving a building, the Post Indicator Valve (PIV) is a valve used to control the water supply to the fire sprinkler system. Most commonly a raised post, the PIV is found in the yard near the building or mounted on the outside of the building.
What is the purpose of a fire department connection quizlet?
What is the purpose of a Fire dept connection(FDC)? Allows FIre dept to pump supplemental water into a standpipr system or sprinkler system.
How does an FDC connection work?
The Fire Department Connection (FDC), also know as the Siamese Connection, is an important component found on most sprinkler and standpipe systems. When a sprinkler system activates, the fire department connects hose lines from a pumper truck to the fire department connection.
Where should the fire department connection be located in relation to the sprinkler control valve?
According to NFPA 13, the FDC should be installed on the fire sprinkler system’s side of its water supply check valve. When responding to a fire, firefighters hook the female end of their hose to a pumper truck and connect the male end of the hose to one of the FDC’s female swivel connections.
What is a wet standpipe?
A “wet” standpipe is filled with water and is pressurized at all times. In contrast to dry standpipes, which can be used only by firefighters, wet standpipes can be used by building occupants. Wet standpipes generally already come with hoses so that building occupants may fight fires quickly.
What is the difference between a wye and a Siamese?
What is the difference between a Wye and a Siamese? A wye is an appliance that flows from one line into two. A siamese is an appliance that flows 2 or more lines into one.
What is the most common type of valve used in the fire service?
The outside stem and yoke valve is the most common type of indicating valve. The valve operates by raising and lowering a gate that cuts off the water flowing through the valve casing. The gate connects to a large brass threaded stem with a circular threaded handle that connects to the yoke.
What is FDC in construction?
FDC stands for Fire Department Connection.