feat: use defined constant values (#825)

* refact: use defined constant values for atmospheric pressure * refact: use defined constant value for R style / docfix --------- Co-authored-by: Even Solbraa <[email protected]>
equinor · Nov 13, 2023 · 94f14e4 · 94f14e4
1 parent 0c9f2bc
commit 94f14e4
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Showing 95 changed files with 873 additions and 769 deletions.
diff --git a/src/main/java/neqsim/PVTsimulation/simulation/ConstantMassExpansion.java b/src/main/java/neqsim/PVTsimulation/simulation/ConstantMassExpansion.java
@@ -7,6 +7,7 @@
 import neqsim.statistics.parameterFitting.SampleSet;
 import neqsim.statistics.parameterFitting.SampleValue;
 import neqsim.statistics.parameterFitting.nonLinearParameterFitting.LevenbergMarquardt;
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.system.SystemInterface;
 import neqsim.thermo.system.SystemSrkEos;
 
@@ -152,7 +153,8 @@ public void runCalc() {
       gasVolume[i] = getThermoSystem().getPhase(0).getNumberOfMolesInPhase()
           * getThermoSystem().getPhase(0).getMolarMass() / density[i]; // getThermoSystem().getPhase(0).getVolume();
       gasStandardVolume[i] = getThermoSystem().getPhase(0).getVolume()
-          * getThermoSystem().getPhase(0).getPressure() / 1.01325
+          * getThermoSystem().getPhase(0).getPressure()
+          / ThermodynamicConstantsInterface.referencePressure
           / getThermoSystem().getPhase(0).getZ() * 288.15 / getThermoSystem().getTemperature();
       Bg[i] = gasVolume[i] * 1e5 / gasStandardVolume[i];
       Zgas[i] = getThermoSystem().getPhase(0).getZ();

diff --git a/src/main/java/neqsim/PVTsimulation/simulation/DifferentialLiberation.java b/src/main/java/neqsim/PVTsimulation/simulation/DifferentialLiberation.java
@@ -2,6 +2,7 @@
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.system.SystemInterface;
 import neqsim.thermo.system.SystemSrkEos;
 
@@ -125,7 +126,8 @@ public void runCalc() {
           }
         }
         gasStandardVolume[i] = getThermoSystem().getPhase(0).getVolume()
-            * getThermoSystem().getPhase(0).getPressure() / 1.01325
+            * getThermoSystem().getPhase(0).getPressure()
+            / ThermodynamicConstantsInterface.referencePressure
             / getThermoSystem().getPhase(0).getZ() * 288.15 / getThermoSystem().getTemperature();
         totalGasStandardVolume += getGasStandardVolume()[i];
         // if (totalVolume[i] > saturationVolume) {
@@ -168,7 +170,7 @@ public void runCalc() {
         }
       }
     }
-    getThermoSystem().setPressure(1.01325);
+    getThermoSystem().setPressure(ThermodynamicConstantsInterface.referencePressure);
     getThermoSystem().setTemperature(288.15);
     try {
       thermoOps.TPflash();

diff --git a/src/main/java/neqsim/PVTsimulation/simulation/GOR.java b/src/main/java/neqsim/PVTsimulation/simulation/GOR.java
@@ -1,5 +1,6 @@
 package neqsim.PVTsimulation.simulation;
 
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.phase.PhaseType;
 import neqsim.thermo.system.SystemInterface;
 import neqsim.thermo.system.SystemSrkEos;
@@ -70,14 +71,15 @@ public void runCalc() {
       }
       if (getThermoSystem().getNumberOfPhases() > 1
           && getThermoSystem().getPhase(0).getType() == PhaseType.GAS) {
-        getThermoSystem().getPhase(0).setPressure(1.01325);
+        getThermoSystem().getPhase(0)
+            .setPressure(ThermodynamicConstantsInterface.referencePressure);
         getThermoSystem().getPhase(0).setTemperature(288.15);
         getThermoSystem().init(1);
         Sm3gas[i] = getThermoSystem().getPhase(0).getVolume();
         // setThermoSystem(getThermoSystem().phaseToSystem(1));
       }
     }
-    getThermoSystem().setPressure(1.01325);
+    getThermoSystem().setPressure(ThermodynamicConstantsInterface.referencePressure);
     getThermoSystem().setTemperature(288.15);
     thermoOps.TPflash();
     oilVolumeStdCond = getThermoSystem().getPhase("oil").getVolume();
@@ -130,7 +132,8 @@ public static void main(String[] args) {
 
     GOR sepSim = new GOR(tempSystem);
     double[] temps = {313.15, 313.15, 313.15, 313.15, 313.15, 313.15, 313.15};
-    double[] pres = {500, 400, 200, 100, 50.0, 5.0, 1.01325};
+    double[] pres =
+        {500, 400, 200, 100, 50.0, 5.0, ThermodynamicConstantsInterface.referencePressure};
     sepSim.setTemperaturesAndPressures(temps, pres);
     sepSim.runCalc();
   }

diff --git a/src/main/java/neqsim/PVTsimulation/simulation/SeparatorTest.java b/src/main/java/neqsim/PVTsimulation/simulation/SeparatorTest.java
@@ -2,6 +2,7 @@
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.phase.PhaseType;
 import neqsim.thermo.system.SystemInterface;
 import neqsim.thermo.system.SystemSrkEos;
@@ -70,14 +71,15 @@ public void runCalc() {
       }
       if (getThermoSystem().getNumberOfPhases() > 1
           && getThermoSystem().getPhase(0).getType() == PhaseType.GAS) {
-        getThermoSystem().getPhase(0).setPressure(1.01325);
+        getThermoSystem().getPhase(0)
+            .setPressure(ThermodynamicConstantsInterface.referencePressure);
         getThermoSystem().getPhase(0).setTemperature(288.15);
         getThermoSystem().init(1);
         Sm3gas[i] = getThermoSystem().getPhase(0).getVolume();
         setThermoSystem(getThermoSystem().phaseToSystem(1));
       }
     }
-    getThermoSystem().setPressure(1.01325);
+    getThermoSystem().setPressure(ThermodynamicConstantsInterface.referencePressure);
     getThermoSystem().setTemperature(288.15);
     thermoOps.TPflash();
     oilVolumeStdCond = getThermoSystem().getPhase("oil").getVolume();
@@ -130,7 +132,8 @@ public static void main(String[] args) {
 
     SeparatorTest sepSim = new SeparatorTest(tempSystem);
     double[] temps = {313.15, 313.15, 313.15, 313.15, 313.15, 313.15, 313.15};
-    double[] pres = {500, 400, 200, 100, 50.0, 5.0, 1.01325};
+    double[] pres =
+        {500, 400, 200, 100, 50.0, 5.0, ThermodynamicConstantsInterface.referencePressure};
     sepSim.setSeparatorConditions(temps, pres);
     sepSim.runCalc();
   }

diff --git a/src/main/java/neqsim/PVTsimulation/simulation/SlimTubeSim.java b/src/main/java/neqsim/PVTsimulation/simulation/SlimTubeSim.java
@@ -2,6 +2,7 @@
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.system.SystemInterface;
 import neqsim.thermo.system.SystemSrkEos;
 import neqsim.thermodynamicOperations.ThermodynamicOperations;
@@ -38,7 +39,7 @@ public SlimTubeSim(SystemInterface tempSystem, SystemInterface injectionGas) {
   public void run() {
     slimTubeNodeSystem = new SystemInterface[numberOfSlimTubeNodes + 1];
 
-    getThermoSystem().setPressure(1.01325);
+    getThermoSystem().setPressure(ThermodynamicConstantsInterface.referencePressure);
     getThermoSystem().setTemperature(288.15);
     thermoOps.TPflash();
 
@@ -162,7 +163,8 @@ public void run() {
        * slimTubeNodeSystem[numberOfSlimTubeNodes].getNumberOfMoles());
        */
       slimTubeNodeSystem[numberOfSlimTubeNodes].setTemperature(288.15);
-      slimTubeNodeSystem[numberOfSlimTubeNodes].setPressure(1.01325);
+      slimTubeNodeSystem[numberOfSlimTubeNodes]
+          .setPressure(ThermodynamicConstantsInterface.referencePressure);
       slimOps1.TPflash();
 
       /*
@@ -183,7 +185,8 @@ public void run() {
     }
 
     slimTubeNodeSystem[numberOfSlimTubeNodes].setTemperature(288.15);
-    slimTubeNodeSystem[numberOfSlimTubeNodes].setPressure(1.01325);
+    slimTubeNodeSystem[numberOfSlimTubeNodes]
+        .setPressure(ThermodynamicConstantsInterface.referencePressure);
     slimOps1.TPflash();
 
     /*

diff --git a/src/main/java/neqsim/chemicalReactions/chemicalEquilibriaum/ChemEq.java b/src/main/java/neqsim/chemicalReactions/chemicalEquilibriaum/ChemEq.java
@@ -1,6 +1,7 @@
 package neqsim.chemicalReactions.chemicalEquilibriaum;
 
 import Jama.Matrix;
+import neqsim.thermo.ThermodynamicConstantsInterface;
 
 /**
  * <p>
@@ -14,7 +15,7 @@ public class ChemEq implements java.io.Serializable {
   private static final long serialVersionUID = 1000;
   int NSPEC = 10;
   int NELE = 3;
-  double R = 8.3143;
+  double R = ThermodynamicConstantsInterface.R;
   double G_min = 0;
   double T = 3500;
   double P = 51;

diff --git a/src/main/java/neqsim/chemicalReactions/chemicalEquilibriaum/ChemicalEquilibrium.java b/src/main/java/neqsim/chemicalReactions/chemicalEquilibriaum/ChemicalEquilibrium.java
@@ -3,6 +3,7 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import Jama.Matrix;
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.component.ComponentInterface;
 import neqsim.thermo.system.SystemInterface;
 
@@ -24,7 +25,7 @@ public class ChemicalEquilibrium implements java.io.Serializable {
   double d_n_t = 0;
   int NSPEC = 2;
   int NELE = 2;
-  double R = 8.314;
+  double R = ThermodynamicConstantsInterface.R;
   Matrix x_solve;
   double y_solve;
   double n_t = 0.0;

diff --git a/...Boundary/fluidBoundarySystem/fluidBoundaryNonReactive/FluidBoundarySystemNonReactive.java b/...Boundary/fluidBoundarySystem/fluidBoundaryNonReactive/FluidBoundarySystemNonReactive.java
@@ -6,6 +6,7 @@
 import neqsim.fluidMechanics.flowNode.fluidBoundary.heatMassTransferCalc.finiteVolumeBoundary.fluidBoundarySystem.FluidBoundarySystem;
 import neqsim.fluidMechanics.flowNode.twoPhaseNode.twoPhasePipeFlowNode.StratifiedFlowNode;
 import neqsim.fluidMechanics.geometryDefinitions.pipe.PipeData;
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.system.SystemFurstElectrolyteEos;
 import neqsim.thermo.system.SystemInterface;
 
@@ -58,7 +59,7 @@ public void createSystem() {
    * @param args an array of {@link java.lang.String} objects
    */
   public static void main(String[] args) {
-    SystemInterface testSystem = new SystemFurstElectrolyteEos(275.3, 1.01325);
+    SystemInterface testSystem = new SystemFurstElectrolyteEos(275.3, ThermodynamicConstantsInterface.referencePressure);
     PipeData pipe1 = new PipeData(10.0, 0.025);
 
     testSystem.addComponent("methane", 0.061152181, 0);

diff --git a/...Boundary/fluidBoundarySystem/fluidBoundarySystemReactive/FluidBoundarySystemReactive.java b/...Boundary/fluidBoundarySystem/fluidBoundarySystemReactive/FluidBoundarySystemReactive.java
@@ -12,6 +12,7 @@
 import neqsim.fluidMechanics.flowNode.fluidBoundary.heatMassTransferCalc.finiteVolumeBoundary.fluidBoundarySystem.FluidBoundarySystem;
 import neqsim.fluidMechanics.flowNode.twoPhaseNode.twoPhasePipeFlowNode.StratifiedFlowNode;
 import neqsim.fluidMechanics.geometryDefinitions.pipe.PipeData;
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.system.SystemFurstElectrolyteEos;
 import neqsim.thermo.system.SystemInterface;
 
@@ -65,7 +66,8 @@ public void createSystem() {
    * @param args an array of {@link java.lang.String} objects
    */
   public static void main(String[] args) {
-    SystemInterface testSystem = new SystemFurstElectrolyteEos(275.3, 1.01325);
+    SystemInterface testSystem =
+        new SystemFurstElectrolyteEos(275.3, ThermodynamicConstantsInterface.referencePressure);
     PipeData pipe1 = new PipeData(10.0, 0.025);
 
     testSystem.addComponent("methane", 0.061152181, 0);

diff --git a/...ain/java/neqsim/fluidMechanics/flowNode/multiPhaseNode/waxNode/WaxDepositionFlowNode.java b/...ain/java/neqsim/fluidMechanics/flowNode/multiPhaseNode/waxNode/WaxDepositionFlowNode.java
@@ -121,7 +121,8 @@ public FlowNodeInterface getNextNode() {
   @SuppressWarnings("unused")
   public static void main(String[] args) {
     SystemInterface testSystem = new SystemSrkEos(273.15 + 40.0, 10.0);
-    // SystemInterface testSystem = new SystemSrkCPAstatoil(275.3, 1.01325);
+    // SystemInterface testSystem = new SystemSrkCPAstatoil(275.3,
+    // ThermodynamicConstantsInterface.referencePressure);
     ThermodynamicOperations testOps = new ThermodynamicOperations(testSystem);
     PipeData pipe1 = new PipeData(0.203, 0.00025);
 

diff --git a/...ava/neqsim/fluidMechanics/flowNode/twoPhaseNode/twoPhasePipeFlowNode/DropletFlowNode.java b/...ava/neqsim/fluidMechanics/flowNode/twoPhaseNode/twoPhasePipeFlowNode/DropletFlowNode.java
@@ -152,7 +152,8 @@ public FlowNodeInterface getNextNode() {
   @SuppressWarnings("unused")
   public static void mainOld(String[] args) {
     SystemInterface testSystem = new SystemSrkCPAstatoil(273.15 + 11.0, 60.0);
-    // SystemInterface testSystem = new SystemSrkCPAstatoil(275.3, 1.01325);
+    // SystemInterface testSystem = new SystemSrkCPAstatoil(275.3,
+    // ThermodynamicConstantsInterface.referencePressure);
     ThermodynamicOperations testOps = new ThermodynamicOperations(testSystem);
     PipeData pipe1 = new PipeData(0.203, 0.00025);
 

diff --git a/...uidMechanics/flowNode/twoPhaseNode/twoPhaseReactorFlowNode/TwoPhaseTrayTowerFlowNode.java b/...uidMechanics/flowNode/twoPhaseNode/twoPhaseReactorFlowNode/TwoPhaseTrayTowerFlowNode.java
@@ -5,6 +5,7 @@
 import neqsim.fluidMechanics.flowNode.twoPhaseNode.TwoPhaseFlowNode;
 import neqsim.fluidMechanics.geometryDefinitions.GeometryDefinitionInterface;
 import neqsim.fluidMechanics.geometryDefinitions.pipe.PipeData;
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.system.SystemFurstElectrolyteEos;
 import neqsim.thermo.system.SystemInterface;
 import neqsim.thermodynamicOperations.ThermodynamicOperations;
@@ -129,15 +130,16 @@ public FlowNodeInterface getNextNode() {
   public static void main(String[] args) {
     /*
      * System.out.println("Starter....."); SystemSrkEos testSystem = new SystemSrkEos(275.3,
-     * 1.01325); ThermodynamicOperations testOps = new ThermodynamicOperations(testSystem); PipeData
-     * pipe1 = new PipeData(10.0, 0.025);
+     * ThermodynamicConstantsInterface.referencePressure); ThermodynamicOperations testOps = new
+     * ThermodynamicOperations(testSystem); PipeData pipe1 = new PipeData(10.0, 0.025);
      * 
      * testSystem.addComponent("methane", 0.011152181, 0); testSystem.addComponent("ethane",
      * 0.00011152181, 0); testSystem.addComponent("water", 0.00462204876, 1);
      * testSystem.addComponent("methane", 0.061152181, 0); testSystem.addComponent("water",
      * 0.00862204876, 1);
      */
-    SystemInterface testSystem = new SystemFurstElectrolyteEos(275.3, 1.01325);
+    SystemInterface testSystem =
+        new SystemFurstElectrolyteEos(275.3, ThermodynamicConstantsInterface.referencePressure);
     ThermodynamicOperations testOps = new ThermodynamicOperations(testSystem);
     PipeData pipe1 = new PipeData(10.0, 0.025);
 

diff --git a/.../neqsim/fluidMechanics/flowNode/twoPhaseNode/twoPhaseStirredCellNode/StirredCellNode.java b/.../neqsim/fluidMechanics/flowNode/twoPhaseNode/twoPhaseStirredCellNode/StirredCellNode.java
@@ -226,7 +226,8 @@ public void setDt(double dt) {
    */
   @SuppressWarnings("unused")
   public static void main(String[] args) {
-    // SystemInterface testSystem = new SystemFurstElectrolyteEos(275.3, 1.01325);
+    // SystemInterface testSystem = new SystemFurstElectrolyteEos(275.3,
+    // ThermodynamicConstantsInterface.referencePressure);
     // SystemInterface testSystem = new SystemSrkEos(313.3, 70.01325);
     SystemInterface testSystem = new SystemSrkCPAstatoil(313.3, 70.01325);
     ThermodynamicOperations testOps = new ThermodynamicOperations(testSystem);

diff --git a/src/main/java/neqsim/fluidMechanics/flowSystem/twoPhaseFlowSystem/shipSystem/LNGship.java b/src/main/java/neqsim/fluidMechanics/flowSystem/twoPhaseFlowSystem/shipSystem/LNGship.java
@@ -8,6 +8,7 @@
 import neqsim.standards.gasQuality.Standard_ISO6578;
 import neqsim.standards.gasQuality.Standard_ISO6976;
 import neqsim.standards.gasQuality.Standard_ISO6976_2016;
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.system.SystemInterface;
 import neqsim.thermodynamicOperations.ThermodynamicOperations;
 
@@ -407,7 +408,8 @@ public static void main(String[] args) {
     // thermo.system.SystemInterface testSystem = new
     // thermo.system.SystemGERG2004Eos(273.15 - 161.4, 1.0);
     neqsim.thermo.system.SystemInterface testSystem =
-        new neqsim.thermo.system.SystemSrkEos(273.15 - 161.4, 1.013);
+        new neqsim.thermo.system.SystemSrkEos(273.15 - 161.4,
+            ThermodynamicConstantsInterface.referencePressure);
     /*
      * testSystem.addComponent("nitrogen", 0.0136); testSystem.addComponent("methane", 0.9186);
      * testSystem.addComponent("ethane", 0.0526); testSystem.addComponent("propane", 0.0115);

diff --git a/...opertyMethods/commonPhasePhysicalProperties/conductivity/PFCTConductivityMethodMod86.java b/...opertyMethods/commonPhasePhysicalProperties/conductivity/PFCTConductivityMethodMod86.java
@@ -1,5 +1,6 @@
 package neqsim.physicalProperties.physicalPropertyMethods.commonPhasePhysicalProperties.conductivity;
 
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.system.SystemInterface;
 import neqsim.thermo.system.SystemSrkEos;
 
@@ -15,7 +16,8 @@ public class PFCTConductivityMethodMod86 extends Conductivity {
   private static final long serialVersionUID = 1000;
 
   /** Constant <code>referenceSystem</code>. */
-  public static SystemInterface referenceSystem = new SystemSrkEos(273.0, 1.01325);
+  public static SystemInterface referenceSystem =
+      new SystemSrkEos(273.0, ThermodynamicConstantsInterface.referencePressure);
   double[] GVcoef = {-2.147621e5, 2.190461e5, -8.618097e4, 1.496099e4, -4.730660e2, -2.331178e2,
       3.778439e1, -2.320481, 5.311764e-2};
   double condRefA = -0.25276292;
@@ -167,7 +169,8 @@ public double calcConductivity() {
       T0 = 273.15;
     }
 
-    double nstarRef = getRefComponentViscosity(T0, 1.01325);
+    double nstarRef =
+        getRefComponentViscosity(T0, ThermodynamicConstantsInterface.referencePressure);
     double CpID = referenceSystem.getLowestGibbsEnergyPhase().getComponent(0).getCp0(T0);
     double Ffunc = 1.0 + 0.053432 * redDens - 0.030182 * redDens * redDens
         - 0.029725 * redDens * redDens * redDens;
@@ -261,7 +264,8 @@ public double getRefComponentViscosity(double temp, double pres) {
         4.2903609488e-2, 1.4529023444e2, 6.1276818706e3};
     // double viscRefK[] = {-9.74602, 18.0834, -4126.66, 44.6055, 0.9676544, 81.8134, 15649.9};
 
-    double molDens = 101325.0 / 8.315 / phase.getPhase().getTemperature() / 1.0e3;
+    double molDens = ThermodynamicConstantsInterface.atm / ThermodynamicConstantsInterface.R
+        / phase.getPhase().getTemperature() / 1.0e3;
     double critMolDens = 10.15;
     double redMolDens = (molDens - critMolDens) / critMolDens;
     double viscRefO = GVcoef[0] * Math.pow(temp, -1.0) + GVcoef[1] * Math.pow(temp, -2.0 / 3.0)
@@ -319,7 +323,8 @@ public double calcMixLPViscosity() {
      * 1.304e-4 * (Math.pow(Mwtemp / Mmtemp, 2.303) - Math.pow(Mmtemp, 2.303))) * 1e3;
      * //phase.getPhase().getMolarMass();
      */
-    double redDens = 101325 / 8.315 / phase.getPhase().getTemperature() / 1.0e3 / 10.15;
+    double redDens = 101325 / ThermodynamicConstantsInterface.R / phase.getPhase().getTemperature()
+        / 1.0e3 / 10.15;
     double alfa0 = 0.0;
     double alfaMix = 0.0;
     double[] alphai = new double[phase.getPhase().getNumberOfComponents()];
@@ -339,8 +344,8 @@ public double calcMixLPViscosity() {
 
     double T0 = phase.getPhase().getTemperature()
         * referenceSystem.getPhase(0).getComponent(0).getTC() / TCmix * alfaMix / alfa0;
-    double P0 =
-        1.01325 * referenceSystem.getPhase(0).getComponent(0).getPC() / PCmix * alfaMix / alfa0;
+    double P0 = ThermodynamicConstantsInterface.referencePressure
+        * referenceSystem.getPhase(0).getComponent(0).getPC() / PCmix * alfaMix / alfa0;
 
     double refVisosity = getRefComponentViscosity(T0, P0);
     double viscosity = refVisosity * Math.pow(TCmix / Tc0, -1.0 / 6.0)

diff --git a/.../physicalPropertyMethods/commonPhasePhysicalProperties/viscosity/PFCTViscosityMethod.java b/.../physicalPropertyMethods/commonPhasePhysicalProperties/viscosity/PFCTViscosityMethod.java
@@ -6,6 +6,7 @@
 
 package neqsim.physicalProperties.physicalPropertyMethods.commonPhasePhysicalProperties.viscosity;
 
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.system.SystemInterface;
 import neqsim.thermo.system.SystemSrkEos;
 
@@ -21,7 +22,8 @@ public class PFCTViscosityMethod extends Viscosity {
   private static final long serialVersionUID = 1000;
 
   int phaseTypeNumb = 1;
-  SystemInterface referenceSystem = new SystemSrkEos(273.0, 1.01325);
+  SystemInterface referenceSystem =
+      new SystemSrkEos(273.0, ThermodynamicConstantsInterface.referencePressure);
   double[] GVcoef = {-2.090975e5, 2.647269e5, -1.472818e5, 4.716740e4, -9.491872e3, 1.219979e3,
       -9.627993e1, 4.274152, -8.141531e-2};
   double visRefA = 1.696985927;

diff --git a/...lPropertyMethods/commonPhasePhysicalProperties/viscosity/PFCTViscosityMethodHeavyOil.java b/...lPropertyMethods/commonPhasePhysicalProperties/viscosity/PFCTViscosityMethodHeavyOil.java
@@ -1,5 +1,6 @@
 package neqsim.physicalProperties.physicalPropertyMethods.commonPhasePhysicalProperties.viscosity;
 
+import neqsim.thermo.ThermodynamicConstantsInterface;
 import neqsim.thermo.system.SystemInterface;
 import neqsim.thermo.system.SystemSrkEos;
 
@@ -14,8 +15,10 @@
 public class PFCTViscosityMethodHeavyOil extends Viscosity {
   private static final long serialVersionUID = 1000;
 
-  // SystemInterface referenceSystem = new SystemBWRSEos(273.15, 1.01325);
-  SystemInterface referenceSystem = new SystemSrkEos(273.0, 1.01325);
+  // SystemInterface referenceSystem = new SystemBWRSEos(273.15,
+  // ThermodynamicConstantsInterface.referencePressure);
+  SystemInterface referenceSystem =
+      new SystemSrkEos(273.0, ThermodynamicConstantsInterface.referencePressure);
   int phaseTypeNumb = 1;
   double[] GVcoef = {-2.090975e5, 2.647269e5, -1.472818e5, 4.716740e4, -9.491872e3, 1.219979e3,
       -9.627993e1, 4.274152, -8.141531e-2};