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

The Version The List of Changes
  1. Parameter selection feature has been introduced that allows maintaining specified flow parameters at any pipeline location:
  2. Waterhammer module has been upgraded:
    1. It is now possible to consider cavitation during waterhammer analysis (in beta-mode)
    2. Dampers (waterhammer arrestors) now may be simulated
    3. Customizable reports are added with waterhammer calculation results and charts
    4. A list has been added to view elements with changed state, boundary conditions in nodes and dampers characteristics
    5. Hydraulic friction at waterhammer is now calculated more precisely.
  3. Topological pipeline analysis has been added that allows viewing both unconnected and computationally independent pipeline parts.
  4. Algorithm of heat and hydraulic analysis of long gas/steam pipelines with big pressure loss has been optimized to achieve better convergence.
  5. Joule-Tomson effect for gas is now considered more precisely that has refined heat and hydraulic analysis of long steam pipelines and also improved its convergence.
  6. A number of improvements of hydrate calculation via PVTSim have been made:
    1. Equation of state used in phase equilibria calculations via PVTSim can now be selected by user,
    2. Database of components and reference constants has been upgraded to that of the latest PVTSim version;
  7. Program warning and error messages during analysis have been optimized, including:
    1. Messages of aggregate state changing and wrong aggregate state during heat and hydraulic analysis of pipelines with single-phase fluids;
    2. Messages at calculating pipelines with pumps having invalid pump head curve definition;
  8. A bug in heat analysis of gas pipelines containing control valves has been fixed.
  9. Analysis of two-phase flows in pipelines with big hydrostatic pressure differences and low pressure has been refined.
  10. Liquid flow with negligibly small velocities are now calculated more precisely.
  11. “Recalc on Graphics” command now more accurately calculates projections of closing loop pipes.
  12. Input data report has been modified:
    1. Thermal insulation is now displayed more correctly;
    2. Fluid data display is now optimized.
  13. A number of heat and hydraulic pipeline analysis bugs have been fixed, including that of pipelines:
    1. having closed branches,
    2. having branches with upstream flows.
  14. A bug on removing pump NPSHR curve points has been fixed.
  15. “Insert node” command has been optimized to refine the location of new node for very long pipes.
  16. A rare bug on calculating phase equilibria of fluid containing one oil fraction has been fixed.
  17. A bug has been fixed that deals with considering roughness at hydraulic analysis of two-phase flow by TUFFP Unified model.
  18. Some other minor bugs and typos have been fixed.
  1. Two-phase flow calculation using “Unified model” by TUFFP (Tulsa University Fluid Flow Project) has been significantly improved:
    1. automatic selection of closure relations for “Unified model” has been implemented – it’s based on newest data of TUFFP experimental database which allows to improve the convergence of calculation results to the experimental data;
    2. new option of closure relations manual selection for “Unified model” has been implemented (for more precise adjustment of two-phase flow calculation methods);
    3. latest version of TUFFP ”Unified model” has been plugged to Hydrosystem (including newest experimental database).
  2. Integration with Hydrate Open Structure of PVTSim thermodynamic package (by Calsep) has been developed – it allows to call PVTSim for hydrates calculation in pipeline straight from Hydrosystem.
  3. Hydrosystem interface with “START” software has been improved:
    1. the checking of pipeline structure at ctp-files import has been added – it allowed to prevent the import of incorrect pipelines containing the connections of 4 or more pipes in one single node;
    2. the bug of incorrect displaying of the pipelines with zero-length pipes (imported from START) has been fixed.
  4. The range of the viscosities at which automatic pump head curve correction is turned on (for liquids with high viscosities) has been revised.
  5. Slight improvements in calculation diagnostics for pipelines with control valves has been made:
    1. incorrect message at negative pressure drop on control valve has been excluded;
    2. nodes inflow/outflow displaying in calculation results window has been fixed.
  6. Gas pipelines heat calculation algorithm has been significantly optimized for extended pipelines with very high pressure drop values.
  7. The algorithm of calculation for pipelines with “dangling” circuits (connected with the rest of the pipeline with only one branch) has been improved.
  8. Flow pattern map drawing for two-phase flow has been improved.
  9. Some minor bugs have been fixed.

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