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 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.

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.

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What is the purpose of a fire department connection FDC 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 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 ).

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.

Which device activates the building fire alarm when water is flowing in a sprinkler system?

Vane or paddle type waterflow detectors and pressure type switches are used to detect the flow of water in a fire sprinkler system and to send an alarm signal. Valve supervisory switches are used to monitor the open or closed position of the valves that control the water supply in the fire sprinkler system.

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.

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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 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.

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.

Why is it dangerous to work below the hot gas layer without attempting to cool it?

Why is it dangerous to work below the hot gas layer without attempting to cool it? The hotter the gas layer is, the more toxic the fumes are. The smoke contains fuel, and it may ignite at any time.

What are the components of a standpipe system?

While each system can vary, a standpipe generally consists of an interconnected series of pipe, pumps, valves, alarms, drains, and fire department connections. Over the course of this article and the next, we’ll discuss each of these components in detail including maintenance and regulatory requirements.

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When attacking a vehicle fire crews should?

When attacking a vehicle fire, crews should: Approach at a 45-degree angle from the side of the vehicle. Which type of alternative vehicle fuel has a flame that is invisible during the day and should be allowed to burn itself out?

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