Steve, the fdc is connected to the system up stream of the fire pump. There is usually a check valve between the fire pump and the distribution side of the system. Once the FD connects to the system we usually pressurize the system at a higher pressure than the fire pump. This would close the check valve and the fire pump would be running at "Churn" (no water flowing). If the fire pump is not set up to shut off if running at churn then possible damage could occur. It is important to know your buildings and systems in your response area.
john Novak TR2FD ... How does water get to the 1,000' level from sea level? Certainly, with gravity, it would take tremendous amount of pressure to pump water to that level. My thought is there would have to be reservoirs at graduated levels to pump water from one reservoir to another. for example, each floor of the World Trade Center was about 1 acre. The demand on water would be such there must have been several direct pumps to satisfy restroom, restaurant and sprinkler needs. I would also like to "think" if you pumped water to the 10th floor reservoir then the 20th floor etc. the weight of the 20th floor could use gravity to service the lower floors. As the holding tanks become depleted they would be refilled not unlike a toilet holding tank. The Roof of the WTC would hold a reservoir with water flowing down under pressure. Sea water is about 1 ton per cubic yard.
This is excellent if you are studying the IBC and want to have an understanding of these systems.
Excellent video! I am currently studying for my c16 this is exactly what I was looking for.
Awesome me too find anything else helpful ?
Very good explanations!
Why do you suggest shutting down the fire pump once the FDC has been supplied? Is this your department’s SOP?
Steve, the fdc is connected to the system up stream of the fire pump. There is usually a check valve between the fire pump and the distribution side of the system. Once the FD connects to the system we usually pressurize the system at a higher pressure than the fire pump. This would close the check valve and the fire pump would be running at "Churn" (no water flowing). If the fire pump is not set up to shut off if running at churn then possible damage could occur. It is important to know your buildings and systems in your response area.
john Novak TR2FD ... How does water get to the 1,000' level from sea level? Certainly, with gravity, it would take tremendous amount of pressure to pump water to that level. My thought is there would have to be reservoirs at graduated levels to pump water from one reservoir to another. for example, each floor of the World Trade Center was about 1 acre. The demand on water would be such there must have been several direct pumps to satisfy restroom, restaurant and sprinkler needs.
I would also like to "think" if you pumped water to the 10th floor reservoir then the 20th floor etc. the weight of the 20th floor could use gravity to service the lower floors. As the holding tanks become depleted they would be refilled not unlike a toilet holding tank. The Roof of the WTC would hold a reservoir with water flowing down under pressure. Sea water is about 1 ton per cubic yard.
Who didn't like the video smh always 1 hater