Pressure Loss with Outlets
For estimating friction pressure losses or appropriate pipe sizes in pipelines with emitters (outlets) at regular intervals such as common in sprinkler or drip lines. Learn more about the units used on this page.
Friction Loss from Laterals or Manifolds with Outlets
This calculates pressure loss due to friction in a pipe with regular equally spaced outlets, such as a sprinkler lateral, drip line, or a manifold.
Minimum Pipe Diameter Size
This calculates the minimum pipe size for a pipe with equally spaced outlets such as a sprinkler lateral or manifold given a maximum allowable pressure loss.
The Equation
This calculator uses Christiansen's equation for a reduction coefficient F that is multiplied by the Hazen-Williams equation for pressure loss due to friction in a pipe with evenly spaced outlets. F is calculated as:
Where:
= Reduction Coefficient
= Number of outlets in the line
= Velocity or flow component of the headloss equation (1.852 in this case).
This is multiplied by the pressure loss (F X Ploss), where pressure loss is calculated by the Hazen-Williams formula:
