Index: Ringtoets/Integration/src/Ringtoets.Integration.Data/AssessmentSection.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -racd375042fb10c2774f972b9dfe8a2cf366de1f2
--- Ringtoets/Integration/src/Ringtoets.Integration.Data/AssessmentSection.cs	(.../AssessmentSection.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Data/AssessmentSection.cs	(.../AssessmentSection.cs)	(revision acd375042fb10c2774f972b9dfe8a2cf366de1f2)
@@ -566,7 +566,6 @@
             {
                 referenceLine = value;
                 double sectionLength = value?.Length ?? double.NaN;
-                Piping.PipingProbabilityAssessmentInput.SectionLength = sectionLength;
                 MacroStabilityInwards.MacroStabilityInwardsProbabilityAssessmentInput.SectionLength = sectionLength;
                 MacroStabilityOutwards.MacroStabilityOutwardsProbabilityAssessmentInput.SectionLength = sectionLength;
                 WaveImpactAsphaltCover.GeneralWaveImpactAsphaltCoverInput.SectionLength = sectionLength;
Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/DerivedPipingOutputFactory.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -racd375042fb10c2774f972b9dfe8a2cf366de1f2
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/DerivedPipingOutputFactory.cs	(.../DerivedPipingOutputFactory.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/DerivedPipingOutputFactory.cs	(.../DerivedPipingOutputFactory.cs)	(revision acd375042fb10c2774f972b9dfe8a2cf366de1f2)
@@ -79,7 +79,7 @@
 
             double requiredProbability = RequiredProbability(probabilityAssessmentInput.A,
                                                              probabilityAssessmentInput.B,
-                                                             probabilityAssessmentInput.SectionLength,
+                                                             assessmentSection.ReferenceLine.Length,
                                                              norm,
                                                              contribution);
             double requiredReliability = StatisticsConverter.ProbabilityToReliability(requiredProbability);
Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanismAssemblyFactory.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -racd375042fb10c2774f972b9dfe8a2cf366de1f2
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanismAssemblyFactory.cs	(.../PipingFailureMechanismAssemblyFactory.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanismAssemblyFactory.cs	(.../PipingFailureMechanismAssemblyFactory.cs)	(revision acd375042fb10c2774f972b9dfe8a2cf366de1f2)
@@ -395,7 +395,7 @@
                                                                              IAssessmentSection assessmentSection)
         {
             return AssemblyCategoriesInputFactory.CreateAssemblyCategoriesInput(failureMechanism.PipingProbabilityAssessmentInput.GetN(
-                                                                                    failureMechanism.PipingProbabilityAssessmentInput.SectionLength),
+                                                                                    assessmentSection.ReferenceLine.Length),
                                                                                 failureMechanism,
                                                                                 assessmentSection);
         }
Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingPlugin.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -racd375042fb10c2774f972b9dfe8a2cf366de1f2
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingPlugin.cs	(.../PipingPlugin.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingPlugin.cs	(.../PipingPlugin.cs)	(revision acd375042fb10c2774f972b9dfe8a2cf366de1f2)
@@ -693,7 +693,7 @@
             {
                 new FailureMechanismAssemblyCategoriesContext(failureMechanism,
                                                               assessmentSection,
-                                                              () => probabilityAssessmentInput.GetN(probabilityAssessmentInput.SectionLength)),
+                                                              () => probabilityAssessmentInput.GetN(assessmentSection.ReferenceLine.Length)),
                 new PipingScenariosContext(failureMechanism.CalculationsGroup, failureMechanism, assessmentSection),
                 new ProbabilityFailureMechanismSectionResultContext<PipingFailureMechanismSectionResult>(failureMechanism.SectionResults, failureMechanism, assessmentSection),
                 failureMechanism.OutputComments
Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/DerivedPipingOutputFactoryTest.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -racd375042fb10c2774f972b9dfe8a2cf366de1f2
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/DerivedPipingOutputFactoryTest.cs	(.../DerivedPipingOutputFactoryTest.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/DerivedPipingOutputFactoryTest.cs	(.../DerivedPipingOutputFactoryTest.cs)	(revision acd375042fb10c2774f972b9dfe8a2cf366de1f2)
@@ -87,10 +87,6 @@
             // Setup
             var failureMechanism = new PipingFailureMechanism
             {
-                PipingProbabilityAssessmentInput =
-                {
-                    SectionLength = 6000
-                },
                 Contribution = 100
             };
 
Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingFailureMechanismAssemblyFactoryTest.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -racd375042fb10c2774f972b9dfe8a2cf366de1f2
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingFailureMechanismAssemblyFactoryTest.cs	(.../PipingFailureMechanismAssemblyFactoryTest.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingFailureMechanismAssemblyFactoryTest.cs	(.../PipingFailureMechanismAssemblyFactoryTest.cs)	(revision acd375042fb10c2774f972b9dfe8a2cf366de1f2)
@@ -51,9 +51,7 @@
             Assert.AreEqual(assessmentSection.FailureMechanismContribution.SignalingNorm, assemblyCategoriesInput.SignalingNorm);
             Assert.AreEqual(assessmentSection.FailureMechanismContribution.LowerLimitNorm, assemblyCategoriesInput.LowerLimitNorm);
             Assert.AreEqual(failureMechanism.Contribution, assemblyCategoriesInput.FailureMechanismContribution);
-            Assert.AreEqual(failureMechanism.PipingProbabilityAssessmentInput.GetN(
-                                failureMechanism.PipingProbabilityAssessmentInput.SectionLength),
-                            assemblyCategoriesInput.N);
+            Assert.AreEqual(failureMechanism.PipingProbabilityAssessmentInput.GetN(assessmentSection.ReferenceLine.Length), assemblyCategoriesInput.N);
         }
 
         #region Simple Assembly
Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingProbabilityAssessmentInputTest.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -racd375042fb10c2774f972b9dfe8a2cf366de1f2
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingProbabilityAssessmentInputTest.cs	(.../PipingProbabilityAssessmentInputTest.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingProbabilityAssessmentInputTest.cs	(.../PipingProbabilityAssessmentInputTest.cs)	(revision acd375042fb10c2774f972b9dfe8a2cf366de1f2)
@@ -37,7 +37,6 @@
             Assert.IsInstanceOf<ProbabilityAssessmentInput>(pipingProbabilityAssessmentInput);
             Assert.AreEqual(0.4, pipingProbabilityAssessmentInput.A);
             Assert.AreEqual(300, pipingProbabilityAssessmentInput.B);
-            Assert.IsNaN(pipingProbabilityAssessmentInput.SectionLength);
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/TreeNodeInfos/PipingFailureMechanismContextTreeNodeInfoTest.cs
===================================================================
diff -u -r050f297b6b5c90409448e64b5383c017ce9e4ef5 -racd375042fb10c2774f972b9dfe8a2cf366de1f2
--- Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/TreeNodeInfos/PipingFailureMechanismContextTreeNodeInfoTest.cs	(.../PipingFailureMechanismContextTreeNodeInfoTest.cs)	(revision 050f297b6b5c90409448e64b5383c017ce9e4ef5)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/TreeNodeInfos/PipingFailureMechanismContextTreeNodeInfoTest.cs	(.../PipingFailureMechanismContextTreeNodeInfoTest.cs)	(revision acd375042fb10c2774f972b9dfe8a2cf366de1f2)
@@ -186,7 +186,7 @@
 
                 failureMechanismAssemblyCategoriesContext.GetFailureMechanismSectionAssemblyCategoriesFunc();
                 PipingProbabilityAssessmentInput probabilityAssessmentInput = pipingFailureMechanism.PipingProbabilityAssessmentInput;
-                Assert.AreEqual(probabilityAssessmentInput.GetN(probabilityAssessmentInput.SectionLength), calculator.AssemblyCategoriesInput.N);
+                Assert.AreEqual(probabilityAssessmentInput.GetN(assessmentSection.ReferenceLine.Length), calculator.AssemblyCategoriesInput.N);
             }
 
             var failureMechanismScenariosContext = (PipingScenariosContext) outputsFolder.Contents.ElementAt(1);