What is the friction loss for two standard CFEMS high-rise packs operating on the 5th floor, supplying from dual 3" lines of 100' each?

To determine the friction loss for the two standard CFEMS high-rise packs operating from dual 3-inch lines on the 5th floor, we need to consider the flow characteristics and the specifics of the hose used.

The friction loss in fire hose is primarily calculated using a specific formula that accounts for the diameter of the hose, the length of the hose, and the flow rate. For 3-inch diameter hose, the loss can vary based on flow and length. When you have two 3-inch lines each 100 feet long, the total length for calculating friction loss would be 200 feet because the two lines function together to supply water.

Typically, the friction loss for a single 3-inch hose is approximately 5 psi per 100 feet at a standard flow if you are using high-rise equipment for firefighting. Therefore, for 200 feet of 3-inch hose, the friction loss becomes:

• 5 psi (for the first 100 feet) + 5 psi (for the second 100 feet) = 10 psi for 200 feet.

However, we must factor in the additional elevation gain for the 5th floor and the influence of multiple lines contributing to additional friction losses. When weighed with the additional elevation,