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Pipe & Vessel Transients

10 tools for pipe and vessel transients: blowdown, line packing, flashing and relief flow, filling and draining, pressurisation and water hammer.

Relief / Blowdown / DepressurisationPipe / Vessel Transients — dynamic rigid-vessel depressurisation for ideal gas or superheated steam through an orifice, Kv/Cv valve or lumped-loss pipe, with wall heat transfer and target-pressure event detection. Optional steam mode continues the vessel inventory through the saturation dome as a homogeneous-equilibrium water/steam mixture.Prototype · Stages: Basic engineering, Detailed engineering · Benchmark reportEN UA DE NL FR ES PL
Gas-Line Packing / DepackingPipe / Vessel Transients — lumped isothermal gas-line inventory under supply-orifice inflow and specified withdrawal, showing linepack pressure and mass versus time.Benchmark tested · 456/456 · Stages: Basic engineering, Detailed engineering · Benchmark reportEN UA DE NL FR ES PL
H₂ / CO₂ Pipeline RepurposingEvidence-led screening for repurposing an existing pipeline to H₂ blends, hydrogen, gaseous CO₂ or dense-phase CO₂.Benchmark tested · 324/324 · Stages: Concept, Detailed engineering, Operation & maintenance · Benchmark reportEN UA DE NL FR ES PL
Steam Pipe Pressure LossPipe / Vessel Transients — compressible Darcy pressure-loss screen for superheated steam with friction, local losses, Reynolds number and outlet Mach number.Benchmark tested · 475/475 · Stages: Basic engineering, Detailed engineering · Benchmark reportEN UA DE NL FR ES PL
Flashing Through Valve / OrificePipe / Vessel Transients — water flashing through a valve/orifice using a homogeneous-equilibrium screening model, including equilibrium quality and critical-flow cap.Prototype · Stages: Basic engineering, Detailed engineering · Benchmark reportEN UA DE NL FR ES PL
Relief Valve Sizing — PreliminaryPipe / Vessel Transients — physics-based preliminary relief area for ideal gas or incompressible liquid, with automatic gas choking check and equivalent throat diameter.Benchmark tested · 347/347 · Stages: Basic engineering, Detailed engineering · Benchmark reportEN UA DE NL FR ES PL
Two-Phase Critical FlowPipe / Vessel Transients — water HEM critical-flow scan along an isentropic equilibrium path, reporting critical mass flux, throat pressure, quality and density.Prototype · Stages: Basic engineering, Detailed engineering · Benchmark reportEN UA DE NL FR ES PL
Pipe Filling / DrainingPipe / Vessel Transients — inertial liquid filling/draining model coupling tank level and pipe velocity with Darcy/local losses, showing startup and level transient.Benchmark tested · 253/253 · Stages: Detailed engineering, Commissioning · Benchmark reportEN UA DE NL FR ES PL
Tank PressurisationPipe / Vessel Transients — adiabatic rigid-tank pressurisation from a fixed gas supply through an orifice, with choking transition, pressure, temperature and admitted mass versus time.Benchmark tested · 234/234 · Stages: Basic engineering, Detailed engineering · Benchmark reportEN UA DE NL FR ES PL
Water Hammer Transient SandboxSimulate pressure waves in a reservoir–pump–pipe–valve system during valve closure, pump trip and check-valve action; view x–t pressure, HGL and extrema.Benchmark tested · 40/40 · Stages: Basic engineering, Detailed engineering · Benchmark reportEN UA DE NL FR ES PL

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