What is the pump discharge pressure for a pumper supplying an elevated master stream using a 5-inch line that is 200 ft long?

Answer: B — 151 psi

To determine the pump discharge pressure for supplying an elevated master stream using a 5-inch line that is 200 feet long, it’s essential to consider the pressure loss due to friction in the hose, as well as the elevation gain if there is one. For a 5-inch diameter hose, the friction loss rate is approximately 0.08 psi per 100 feet of hose length at a flow rate of 1,000 gallons per minute (GPM). First, we calculate the friction loss for a 200-foot length. Using the formula for friction loss: - **Friction Loss = (Length in feet / 100) x (Friction loss per 100 feet)** For 200 feet: - Friction Loss = (200 / 100) x 0.08 psi = 1.6 psi Next, if the master stream is elevated, we need to add the elevation pressure. The standard pressure calculation for elevation is 0.5 psi per foot of elevation. If we assume a common elevation of around 100 feet, that would add 50 psi (100 ft x 0.5 psi/ft). Therefore, the total pressure required, combining both the friction loss and elevation gain, would