Engineering & Design Data - Spears Mfg Co Inc

7 Water VelocitiesVelocities for water in feet per second at different GPM's and pipe inside diameters can be calculated as follows:Where: V = velocity in feet per secondG = gallons per minuteA = inside cross sectional area in square inchesCAUTION: Flow velocities in excess of feet per second are not recommended for closed-end systems. Contact Spears Technical Services for additional & Design data FLOW VELOCITY & FRICTION LOSSF riction Loss Through FittingsFriction loss through fittings is expressed in equivalent feet of the same pipe size and schedule for the system flow rate. Schedule 40 head loss per 100' values are usually used for other wall thicknesses and standard iron pipe size Friction Loss for PVC and CPVC Fittings in Equivalent Feet of Straight Run PipeNote: Values 10"-24": Approximate values from Valves for Select Spears Valves and StrainersPressure Drop In Valves & StrainersPressure drop calculations can be made for valves and strainers for different fl uids, fl ow rates, and sizes using the CV values and the following equation:Where:P = Pressure drop in PSI; feet of water = PSI.

8 Engineering & Design Data Head Loss Characteristics of Water Flow Through Rigid Plastic Pipe – Nomograph The nomograph provides approximate values for water fl ow, head loss and water velocity for a wide range of

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