Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanism.cs
===================================================================
diff -u -r333b8e9f8ae448c1a2be0eb6899d5b0ec99dde95 -rc5c520903649e40b5a48611051705c07c95672e9
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanism.cs	(.../PipingFailureMechanism.cs)	(revision 333b8e9f8ae448c1a2be0eb6899d5b0ec99dde95)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanism.cs	(.../PipingFailureMechanism.cs)	(revision c5c520903649e40b5a48611051705c07c95672e9)
@@ -54,14 +54,6 @@
             sectionResults = new ObservableList<PipingFailureMechanismSectionResult>();
         }
 
-        public override IEnumerable<ICalculation> Calculations
-        {
-            get
-            {
-                return CalculationsGroup.GetCalculations();
-            }
-        }
-
         /// <summary>
         /// Gets the available surface lines within the scope of the piping failure mechanism.
         /// </summary>
@@ -85,6 +77,14 @@
 
         public CalculationGroup CalculationsGroup { get; }
 
+        public override IEnumerable<ICalculation> Calculations
+        {
+            get
+            {
+                return CalculationsGroup.GetCalculations();
+            }
+        }
+
         public IObservableEnumerable<PipingFailureMechanismSectionResult> SectionResults
         {
             get
@@ -93,15 +93,14 @@
             }
         }
 
-        public override void AddSection(FailureMechanismSection section)
+        protected override void AddSectionResult(FailureMechanismSection section)
         {
-            base.AddSection(section);
+            base.AddSectionResult(section);
             sectionResults.Add(new PipingFailureMechanismSectionResult(section));
         }
 
-        public override void ClearAllSections()
+        protected override void ClearSectionResults()
         {
-            base.ClearAllSections();
             sectionResults.Clear();
         }
     }