Pass | Hydrosystem

PASS/HYDROSYSTEM combines sophisticated calculation capabilities with ease-of-use to deliver fluid flow and heat transfer simulation and sizing of any piping network in any design stage by “regular” engineers and designers. Process and piping engineers of more than 600 companies use the software now every day.

Pipelines analysed include:

• Process piping systems at plants, storage facilities, pumping, and compressor stations;
• Plant utility piping systems such as steam, water, compressed air, inert gases, fuel, refrigerants, and others;
• Piping in mechanical industries such as aerospace, ship building, boiler, turbines, and more;
• Oil and gas upstream and midstream pipelines;
• Outdoor piping networks including district heating, water, and gas distribution;
• Other piping networks.

Extensive analysis capabilities, along with integration with popular CAD tools and within the PASS suite, makes PASS/HYDROSYSTEM an ideal component for any piping system design workflow.

To analyse a piping system for hydraulic and thermal effects it is necessary to simulate its behaviour on three scale levels: pipe cross section, pipe/branch run, and the whole piping network – and then link and solve these models together.

At the cross-sectional scale it is necessary to define the type of fluid flow (laminar, turbulent, choked, or subsonic, flow pattern for multiphase flow – stratified, annular, intermitted, etc.), and the specifics of heat exchange between fluid and environment through pipe wall and thermal insulation. This knowledge is then used when calculating integral parameters of the flow and heat exchange (pressure gradient, heat losses per length, etc.) and following up how all fluid parameters change along the pipe/branch and all over the network. This would be impossible without access to most reliable thermodynamic data provided by software.

PASS/HYDROSYSTEM provides a calculation engine for all necessary fluid properties and phase equilibrium on the base of fluid composition, for a wide spectrum of fluids and applications.

For more advanced fluid properties and phase equilibrium calculations the program can use the Simulis Thermodynamics library by ProSim S.A.. This library covers Oil and Gas, Chemical, Biochemical, and other industries and provides a wide range of modern methods of physical properties, gas-liquid, and liquid-liquid phase equilibrium calculation for mixtures of more than 3000 compounds and oil fractions.

PASS/HYDROSYSTEM can work with a large spectrum of pipeline types on different stages of design and offers unique multi-variant graphical representations of the model. The program can switch between different modes and level of detail (PFD/P&ID – like unscaled scheme with regulated level of detailing, 2D scaled distributed networks on background map, and single line or solid 3D scaled, or unscaled representation for process piping) depending on what is suitable for a specific design phase and pipeline type.

PASS/HYDROSYSTEM delivers a unique feature for customers who need to select pumps for their piping systems. The seamless integration with famous Spaix software (by our partner VSX – VOGEL SOFTWARE GmbH, Germany) allows forwarding of all necessary data (duty point data, fluid properties, restriction on NPSH) to Spaix with the push of a button. The user then selects the optimal pump (with all optimization features – impeller trimming, changing the rotation speed, changing blade angle of propeller pumps etc.) and forwards all of the selected pump’s performance curves back to PASS/HYDROSYSTEM for final calculation. The lite (Quick & Easy) version of Spaix is available free of charge along with PASS/HYDROSYSTEM.