What is Pipe Network Simulation? Engineer's Guide
Pipe network simulation is the process of mathematically modelling fluid flow through a system of interconnected pipes, fittings, valves, and other components. The goal is to predict pressures, flow rates, and velocities throughout the network under specified operating conditions.
Why Simulate?
Real piping systems can be complex — branching networks, parallel paths, pumps, control valves, and elevation changes all interact to determine the flow distribution. Manual calculations become impractical beyond simple series/parallel arrangements. Simulation solves the full system of equations simultaneously, giving accurate results even for complex topologies.
Common reasons engineers use pipe network simulation:
- System design — size pipes, select pumps, and specify control valves before construction
- Troubleshooting — diagnose pressure drops, flow imbalances, or capacity issues in existing systems
- What-if analysis — evaluate the impact of adding branches, changing pipe sizes, or modifying operating conditions
- Code compliance — verify that pressures, velocities, and flow rates meet design standards
How It Works
At its core, pipe network simulation applies two fundamental principles at every node and pipe in the network:
- Conservation of mass — flow into each junction must equal flow out (continuity)
- Conservation of energy — pressure changes around any loop must sum to zero, accounting for friction losses, elevation changes, and pump/valve effects
These principles produce a system of nonlinear equations that are solved iteratively
using numerical methods. SimuPipe uses the Hardy Cross-derived approach with scipy.optimize.root for incompressible flow, and an isothermal P-squared
formulation for compressible (gas) flow.
Who Uses It?
- Mechanical engineers designing HVAC and process piping
- Civil engineers working on water distribution networks
- Chemical and process engineers sizing plant piping
- Fire protection engineers verifying sprinkler system hydraulics
- Oil and gas engineers modelling pipeline and gathering systems
SimuPipe's Approach
Traditional pipe network software is desktop-based, expensive, and often has a steep learning curve. SimuPipe brings hydraulic simulation to the browser with a visual drag-and-drop editor, real-time validation, and both incompressible and compressible solvers — making it accessible to engineers who need answers without the overhead of legacy tools. You can get started with our free engineering tools including the Friction Loss Calculator, Reynolds Number Calculator, and Valve Sizing Calculator.