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Nominal Size Selection, Heat Loss & Hydraulic Calculation of Pipeline Systems

The Hydrosystem software performs heat loss & pressure drop calculations as well as nominal size selection for pipeline networks, transporting compressible or incompressible single-phase fluids (gases or liquids), as well as two-phase gas-liquid mixtures. It is widely used in power, oil refining, petrochemical, gas, oil, chemical and other industries. Different parameters of the process piping, main lines, heating and gas-distributing systems and other pipe networks can be calculated using the program. Hydrosystem allows to calculate above ground and underground piping systems of any complexity (including networks with loops). The analysis results can be used for pumps, compressors, control and safety valve selection to ensure the reliability and efficiency of the piping systems.

Entering Heating System Data
Viewing Calculation Results (pressure losses)

Entering Heating System Data

Viewing Calculation Results (pressure losses)

Hydrosystem performs various types of calculations:

  • Isothermal flow pressure drop calculation (assuming that the fluid temperature is constant),
  • Branch NS selection based on entered node pressures and branch flow rates,
  • Non-isothermal calculation (considering heat loss and temperature drop factors),
  • Transient flow calculation in pipelines (waterhammer calculation).

Isothermal flow pressure drop calculation and NS selection.

The software allows performing various tasks depending on the calculation type and data entered (node pressures, demands, fluid parameters, pipeline structure):

  • Inner branch diameter selection and isothermal pressure drop calculation on the basis of terminal node pressures and branch flow rates (NS selection),
  • Flow capacity calculation with given terminal node pressures,
  • Isothermal pressure drop calculation with given branch flow rates and/or node pressures,
  • A combination of the calculation types mentioned above.

Non-isothermal Analysis.

This module performs hydraulic, heat loss and temperature drop calculations. It considers environmental data, wall material, pipeline location (indoors, outdoors, underground, in an underground duct, in a tunnel), insulation and jacket material properties, as well as their changes along the pipeline.

Two-Phase Gas-Liquid Flow Analysis

The two-phase flow module performs pressure drop calculations with given branch flow rates and/or node pressures, as well as heat loss, temperature drop and flash calculations. The program analyses and defines two-phase flow patterns, void fraction, parameters of flow for each phase, automatically finds places of boiling and condensation and switches between single-phase and two-phase modeling. Hydrosystem utilizes a number of methodologies for different two-phase flow calculations, from which the user can flexibly select the most appropriate methods for any given task. This selection can be defined by the user via a special method selection XML rule file. The program also allows drawing and plotting two-phase flow pattern maps (in superficial velocity of liquid phase vs. gas phase, m/s coordinates).

Transient Flow Calculation

Hydrosystem performs transient process (e.g. water hammer) analysis for liquid flow based on the steady state flow calculation results of any type mentioned above. This process can be driven by both single and multiple events valve opening or closing and pump starting or shutting down. The program can calculate shock wave velocity and the main parameters of fluid flow (head, pressure, flow rate, fluid velocity) and their change with time taking into account the pressure losses in the pipeline. These parameters are calculated and displayed for all of the piping components and for all user defined points in the pipeline with given time step and calculation time range. The program also allows to display the values of selected parameters dynamically during the calculation on the pipeline graphic view and calculates both minimum and maximum pressures.

Pump Selection

The program also allows to use the Spaix 4 Quick&Easy application (by VSX VOGEL SOFTWARE GmbH) for pump selection. Hydrosystem automatically transfers operation points data (required head of pump, flowrate etc.) and necessary fluid properties to Spaix and launches the latter program for pump selection. After an optimal pump is selected (including appropriate duty point adjustment) in Spaix, the data on the corrected pump performance and NPSH curves for the selected pumps is automatically transferred back to Hydrosystem for a final hydraulic analysis. The compact pump selection program Spaix 4 Quick&Easy is delivered to all Hydrosystem users for free.

Graphic User Interface is simple and user-friendly. By default the graphic window displays the pipeline flowsheet in a way that minimizes intersections between different pipeline branches. The wide set of navigation tools and different levels of detailing help analyze the pipeline structure. Precise 3D graphic representation and graphic editor allow creating a copy of the real pipeline. One may also specify the raster background (for example, a city or factory map) before entering flowsheet data and move the nodes directly on the map. The software in this case automatically determines the pipe lengths according to the map scale. This mode is especially useful for utilities network calculations.

The calculated results include fluid velocity, friction and local pressure drops, fluid properties, NPSH and others. The accuracy of calculations is ensured by an automatic recount of fluid properties and flows at every pipeline component as well as by detailed component calculations in accordance with correlations by Idelchik, Miller and other sources, as well as modern two-phase flow methods. The results may be shown on the pipeline graph by introducing different colors for different values of a specific parameter. For example, one can easily determine a component with maximum pressure loss value.

The software package also includes the following modules:

  • STARS library allows calculating properties of individual fluid components, oil fractions and their mixtures in liquid and gas phases. The program database contains more than 1600 components. STARS can automatically compute phase equilibrium and check the validity of fluid phase entered.
  • GERG-2008 library allows calculating natural gas thermodynamic properties and phase equilibrium based on the popular GERG-2008 equation of state.
  • WaterSteamPro module allows more accurate calculations of water and steam fluid properties on the basis of IAPWS-IF97 equations.

For more advanced fluid properties and phase equilibrium calculations the program can use the Simulis Thermodynamics library by ProSim , which is delivered as a separate product.

The built-in Report Generator allows to preview and print the output documents, as well as to export them to various formats for further use. End users can customize the documents (for example, add a company logo) via the Designer tool.

Head profile diagram in MS Excel may be constructed in order to assist in water network calculations.

The program can import piping geometry and data from different Plant design systems via the PCF file format, from START software projects, from open-format XML files and from AVEVA PDMS (via open-format XML files). Graphic pipeline representation may be exported to DXF format.

The software has been used by hundreds of Russian and foreign companies for more than 30 years, which ensures its accuracy and robustness.

System Requirements: Any Intel-compatible computers under Windows XP/Vista/7/8.

Pipeline 3D Model in Hydrosystem

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