DESIGN & ENGINEERING DATA

Transcription

1 DESIGN & ENGINEERING DATA Flow Friction loss through PVC pipe is normally obtained by using the Hazen-Williams equation shown below for water: f = 83 x ( 0 ) 2 x Q 2 Where: C di f = friction head loss in feet of water per 0 feet of pipe C = constant for inside pipe roughness (C = for ABS and PVC pipe) Q = flow in U.S. gallons per minute di = inside diameter of pipe in inches Water Velocities Water velocities in feet per second may be calculated as follows: V = 89 Q di 2 Where: V = velocity in feet per second Q = flow in U.S. gallons per minute di = inside diameter of pipe in inches Through Fittings The friction loss through fittings is considered to be equivalent to the loss through a certain number of linear feet of pipe of the same diameter as the fittings. To determine the loss through a piping system, add together the number of equivalent feet calculated for the fittings in the system. The chart below shows approximate friction losses, in equivalent feet, for a variety of Schedule & PVC and CPVC fittings of different sizes. Approximate For PVC and CPVC Fittings In Equivalent Of Straight Pipe Fitting Tee (Run) Tee (Branch) Elbow Elbow Male/Female Adapter The table on page 49 shows friction heads in feet and friction losses in psi for Schedule pipe. It also shows the gallons per minute (GPM) and velocities (in feet per second) for various pipe sizes.

2 FRICTION LOSS AND FLOW VELOCITY FOR SCHEDULE THERMOPLASTIC PIPE (Friction head and friction loss are per 0 feet of pipe.) NOTICE: Flow velocity should not exceed 5 feet per second. Velocities in excess of 5 feet per second may result in system failure and property damage. in. 2 in. 2 3 in in. 2 in

3 Plastics Technical Manual FRICTION LOSS AND FLOW VELOCITY FOR SCHEDULE THERMOPLASTIC PIPE (Friction head and friction loss are per 0 feet of pipe.) NOTICE: Flow velocity should not exceed 5 feet per second. Velocities in excess of 5 feet per second may result in system failure and property damage. in in. 2 3 in in. 2 in

4 2 3 in FRICTION LOSS AND FLOW VELOCITY FOR SDR 2 THERMOPLASTIC PIPE (Friction head and friction loss are per 0 feet of pipe.) NOTICE: Flow velocity should not exceed 5 feet per second. Velocities in excess of 5 feet per second may result in system failure and property damage. in. 2 in in. 2 in

5 Plastics Technical Manual 2 3 in FRICTION LOSS AND FLOW VELOCITY FOR SDR 26 THERMOPLASTIC PIPE (Friction head and friction loss are per 0 feet of pipe.) NOTICE: Flow velocity should not exceed 5 feet per second. Velocities in excess of 5 feet per second may result in system failure and property damage. in. 2 in in. 2 in

6 of Water 2 in FRICTION LOSS AND FLOW VELOCITY FOR SDR CTS CPVC THERMOPLASTIC PIPE (Friction head and friction loss are per 0 feet of pipe.) NOTICE: Flow velocity should not exceed 8 feet per second. Velocities in excess of 8 feet per second may result in system failure and property damage. of Water of Water of Water of Water of Water in