diff --git a/src/main/java/neqsim/processSimulation/measurementDevice/FlowInducedVibrationAnalyser.java b/src/main/java/neqsim/processSimulation/measurementDevice/FlowInducedVibrationAnalyser.java
index 7ec4c2da87..3c87028c0d 100644
--- a/src/main/java/neqsim/processSimulation/measurementDevice/FlowInducedVibrationAnalyser.java
+++ b/src/main/java/neqsim/processSimulation/measurementDevice/FlowInducedVibrationAnalyser.java
@@ -87,14 +87,14 @@ public double getMeasuredValue(String unit) {
       double externalDiamater = (pipe.getDiameter() + 2 * pipe.getThickness()) * 1000;// mm
       double alpha = 0.0;
       double betta = 0.0;
-      if (supportArrangement == "Stiff") {
+      if (supportArrangement.equals("Stiff")) {
         alpha = 446187 + 646 * externalDiamater
             + 9.17E-4 * externalDiamater * externalDiamater * externalDiamater;
         betta = 0.1 * Math.log(externalDiamater) - 1.3739;
-      } else if (supportArrangement == "Medium stiff") {
+      } else if (supportArrangement.equals("Medium stiff")) {
         alpha = 283921 + 370 * externalDiamater;
         betta = 0.1106 * Math.log(externalDiamater) - 1.501;
-      } else if (supportArrangement == "Medium") {
+      } else if (supportArrangement.equals("Medium")) {
         alpha = 150412 + 209 * externalDiamater;
         betta = 0.0815 * Math.log(externalDiamater) - 1.3269;
       } else {
@@ -105,7 +105,7 @@ public double getMeasuredValue(String unit) {
       double Fv = alpha * Math.pow(diameterOverThickness, betta);
       double LOF = mixDensity * mixVelocity * mixVelocity * FVF / Fv;
       return LOF;
-    } else if (method == "FRMS") {
+    } else if (method.equals("FRMS")) {
       if (GVF < 0.8) {
         return GVF;
       } else {
diff --git a/src/main/java/neqsim/processSimulation/measurementDevice/simpleFlowRegime/Pipe.java b/src/main/java/neqsim/processSimulation/measurementDevice/simpleFlowRegime/Pipe.java
index b797fb517b..f6e2abdcd0 100644
--- a/src/main/java/neqsim/processSimulation/measurementDevice/simpleFlowRegime/Pipe.java
+++ b/src/main/java/neqsim/processSimulation/measurementDevice/simpleFlowRegime/Pipe.java
@@ -157,9 +157,9 @@ public void setAngle(double angle) {
    * @return a double
    */
   public double getAngle(String unit) {
-    if (unit == "Degree") {
+    if (unit.equals("Degree")) {
       return this.angle;
-    } else if (unit == "Radian") {
+    } else if (unit.equals("Radian")) {
       return this.angle * pi / 180;
     }
     return this.angle;
diff --git a/src/main/java/neqsim/processSimulation/processEquipment/util/FlowRateAdjuster.java b/src/main/java/neqsim/processSimulation/processEquipment/util/FlowRateAdjuster.java
index d018a3fa5f..0a27953ed0 100644
--- a/src/main/java/neqsim/processSimulation/processEquipment/util/FlowRateAdjuster.java
+++ b/src/main/java/neqsim/processSimulation/processEquipment/util/FlowRateAdjuster.java
@@ -137,7 +137,7 @@ public void run(UUID id) {
     waterStream.setTemperature(temperature, "C");
     waterStream.setPressure(pressure, "bara");
 
-    if (unit == "Sm3/hr") {
+    if (unit.equals("Sm3/hr")) {
       gasStream.setFlowRate(desiredGasFlow, unit);
       oilStream.setFlowRate(desiredOilFlow * oilDensity, "kg/hr");
       waterStream.setFlowRate(desiredWaterFlow * waterDensity, "kg/hr");