How much pressure is lost to friction as 1,200 gpm (4542 L/min) travels through 200...

The pressure loss due to friction for 1,200 gpm traveling through 200 ft of 5 in. schedule 40 steel pipe with a C-factor of 120 is approximately 21 psi (1.45 bar). This calculation takes into account the flow rate, pipe length, diameter, and roughness factor.

References: Friction loss calculations in fire protection engineering are based on formulas such as the Hazen-Williams equation, which takes into account the flow rate, pipe material (C-factor), diameter, and length.