hf=f⋅LD⋅V22gh sub f equals f center dot the fraction with numerator cap L and denominator cap D end-fraction center dot the fraction with numerator cap V squared and denominator 2 g end-fraction : Head loss due to friction. : Darcy friction factor. : Length, diameter, velocity, and gravity.
A pipe flow calculator is an essential hydraulic tool used to determine the relationships between flow rate, pressure drop, pipe diameter, and velocity. By inputting known parameters, engineers and technicians can ensure that systems like HVAC, plumbing, and fire protection operate within safe and efficient limits. Core Calculation Methods pipeflow calculator
| Input Group | Example Entry | | ----------------- | ------------------------------------ | | Fluid | Water @ 20°C | | Pipe material | Carbon steel, schedule 40, 4″ | | Flow rate | 200 GPM | | Length | 500 ft | | Elevation change | +25 ft (pump at inlet, outlet higher) | | Fittings | 6 × 90° LR elbow, 2 × gate valve | | Output | Value | | Pressure drop | 18.7 psi | | Velocity | 5.1 ft/s (OK) | | Pump head required| 48.2 ft | | Power (75% eff.) | 2.8 HP | hf=f⋅LD⋅V22gh sub f equals f center dot the