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