Calculations
Recommendations
Circular weirHazen-Williams equation head lossFair-Whipple-Hsiao equationUniversal x Hazen-Williams relationshipDynamic viscosity of atmospheric airPressure drop in Leopold blocksDarcy-Weisbach formula for head loss in water
Calculate head
Calculate diameter
Calculate length
Calculate roughness
Calculate flow
Input data
Flow
Temperature
Diameter
Length
Equivalent roughness
Roughness multiplier
Output data
Head loss
Description
Calculate the head loss in water flowing through pipes using the Darcy-Weisbach formula and the Churchill correlation for determining the friction factor.
There are 5 calculation possibilities:
- Calculate head loss
- Calculate diameter
- Calculate pipe length
- Calculate equivalent roughness
- Calculate flow rate
Input and Output Parameters
Input Data
| Parameter | Standard Units | Description |
|---|---|---|
| Flow | m³/s | Water volumetric flow rate |
| Temperature | °C | Water temperature |
| Diameter | m | Internal pipe diameter |
| Length | m | Pipe length |
| Equivalent roughness | mm | Pipe surface roughness |
| Roughness multiplier | - | Adjustment factor for roughness |
Output Data
| Parameter | Standard Units | Description |
|---|---|---|
| Head loss | m | Total head loss |
| Diameter | mm | Calculated internal pipe diameter |
| Length | m | Required pipe length |
| Equivalent roughness | mm | Calculated surface roughness |
| Flow | m³/s | Calculated water flow rate |
References
- CHURCHILL, Stuart W. (1977). Friction-factor equation spans all fluid-flow regimes. Chemical engineering, Nov.