Analyze hydraulic effects when liquid is injected or stripped at a pipeline midpoint. Determine mixed fluid properties, velocity changes, and upstream/downstream pressure profiles.
Understand injection and stripping point hydraulics, fluid mixing, and pressure profile analysis
This calculator analyzes hydraulic effects when liquid is injected or stripped at a pipeline midpoint. It determines mixed fluid properties, velocity changes, and upstream/downstream pressure profiles using Darcy-Weisbach friction loss.
Mixed specific gravity is calculated by volume-weighted average: SG_mix = (Q₁×SG₁ + Q₂×SG₂)/(Q₁ + Q₂). The calculator also computes the resulting downstream velocity and Reynolds number changes.
Injection adds fluid at a midpoint, increasing downstream flow rate and potentially changing fluid properties. Stripping removes fluid, decreasing downstream flow. Both operations affect pressure profiles, velocities, and friction losses upstream and downstream.
Injection or stripping creates a hydraulic discontinuity where flow rate, velocity, and fluid properties change. Treating the pipeline as a single section produces incorrect pressure drop and velocity calculations downstream of the connection point.
Erosional velocity is the maximum allowable velocity before pipe wall damage occurs, calculated per API RP 14E as Ve = C/√ρ. At injection points, increased downstream flow can push velocity above erosional limits, requiring larger downstream pipe diameter.