SLB is pleased to announce the availability of Symmetry 2025.2 process software platform. This platform offers a unique opportunity to model your process workflows in one environment, integrating pipelines, networks, and facilities models, while ensuring consistent thermodynamics and fluid characterization across the full system.
version 2025.2 (June 2025 - Symmetry Update Release)
Nomenclature
+ addition
o changes
x bug fix
(x.y.z) update version/build in which a feature was first available (Major.Minor.Build)
this format is used for features that were released in between major releases
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Thermodynamics
+ Added a new setting for the Thermodynamic Model: "Apply Correction to CO2 Thermal Properties". This setting applies a correction based on the Span-Wagner method to the calculated CO2 thermal properties when using the APR NG 2.0 Thermal method in the APR for Natural Gas 2 Thermodynamic Model.
+ Added an internal flag to label the Ideal Gas Enthalpy basis from the Amines 2 Thermodynamic Model as being calculated with the reference of the ideal gas heat of formation at 25 C. This allows setting the Enthalpy offset used for reactive energy balances to zero in this model.
o Improved fugacity coefficient calculations for mixed amines systems when using the Amines 2 Thermodynamic model. The improved calculations allow for a better and faster convergence of flash computations.
o Vapor phase enthalpy calculations in the Amines 2 thermodynamic model are based on the Advanced Peng-Robinson thermodynamic model.
x Fixed calculation of fugacity coefficients in SRK based property packages when the alpha function is evaluated at high temperature.
x Fixed fugacity coefficient calculations in the Amines 2 thermodynamic model when ions not participating in reactions are added to the component list.
x Fixed Status message when modifying equilibrium constant parameters for a reaction in the Reaction window from the Amines 2 property package.
x Fixed the use of "," for decimal points based on locale settings when defining chemical reactions in the Amines 2 thermodynamic model.
x Fixed vapor phase thermal conductivity calculation for the VMG(Yaws) model when Water is part of the component list but it has zero amount in the fluid. Previous calculation was considering a water pressure correction when water was in the component list but in zero amount.
x Improved phase identification for single phase fluids in REFPROP-based property packages.
x Improved the convergence of 2-phase flashes where the vapor fraction remains steady after several iterations once the residual error has been bracketed. These type of flashes could be found in water wash sections of absorption towers where a small amount of amines is present in the corresponding trays.
x Improved viscosity parameters for PGMEA (Propylene glycolmonomethyl ether acetate).
x Updated Ideal Gas Heat Capacity parameters for ALUMINUM OXIDE in the Symmetry database, new values are available in the 2025.2 Database Version and are estimated from the method used for gasification compounds.
Flaresim
x Fixed error when switching between shield types in Flaresim.
Pipe Workspace
x Fixed an issue in the Pipe Workspace where integrated Pipe-Process cases were not solving in downstream of valve as a source.
Network Solver
x Fixed an issue in the Pipe Workspace where switching the producing wells to high pressure resulted in solver error.
Dynamics
o Improved convergence of dynamics flash when there are trace amounts of hydrocarbons in water.
x Fix to prevent a crash in certain cases when being imported from a json file. The issues were present in the background dynamics objects creation.
x Fixed a bug in fluid synchronization that resulted in incorrect sizing of Dynamics Tower Section when initialized from Steady-State.
x Fixed an issue where initializing a depressuring system would fail to set a variable if a unit operation had the same name as the variable.
x Fixed issue preventing Multi-Sided Heat Exchangers from being configured properly in the dynamics engine.
x Fixed spurious increase in holdup mass when Iterate Between PFS and Comp is turned on.
x Fixed the status of the "Is Choked" checkbox in Valves that indicated choked flow even when "Choke Calculation" was set to "No Choke".
x Fixed wall temperature not updating in dynamic multi-sided exchanger causing energy balance discrepancies.
Extensions and Links
+ OLGA Link - Added variables to OLGA Link to track the status of the OLGA Server.
+ OLGA Link - Added warning message for mismatched property packages between OLGA link and connected streams.
+ OLGA Link - Added warning message when the expected and actual number of OLGA components does not match.
o OLGA Link - Updated the default maximum number of cores to use in Olga when running the OLGA link to 16. Added the option for configuring this setting in the OLGA Link's Configuration tab.
x OLGA Link - Disable Add and Delete connections buttons for upstream, downstream and signal connections when the OLGA Link unit operation is connected to the server or when the integrator is running.
x OLGA Link - Fixed a rare hang when using the Symmetry-OLGA link due to sequencing of variable connections and OLGA time-stepping.
x OLGA Link - Fixed Integrator Time synchronization issue between the internal OLGA Link time and the Symmetry flowsheet time when connecting to the OLGA server.
x OLGA Link - Fixed OLGA link composition mapping when a mix of hydrocarbons, water, and hydrate inhibitors are present in the component list, both when using Multiflash and SFE in OLGA.
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