Index: Ringtoets/Piping/src/Ringtoets.Piping.InputParameterCalculation/InputParameterCalculationService.cs
===================================================================
diff -u -r10779bb6a6db2d00f4627b2bc190e7e35e1fee3e -r0adc6562a9cedb81859034ef5d62e9b11db4d9c7
--- Ringtoets/Piping/src/Ringtoets.Piping.InputParameterCalculation/InputParameterCalculationService.cs	(.../InputParameterCalculationService.cs)	(revision 10779bb6a6db2d00f4627b2bc190e7e35e1fee3e)
+++ Ringtoets/Piping/src/Ringtoets.Piping.InputParameterCalculation/InputParameterCalculationService.cs	(.../InputParameterCalculationService.cs)	(revision 0adc6562a9cedb81859034ef5d62e9b11db4d9c7)
@@ -27,16 +27,14 @@
 
 namespace Ringtoets.Piping.InputParameterCalculation
 {
+    /// <summary>
+    /// This class can be used to calculate input parameters for a piping calculation based on other input parameters.
+    /// </summary>
     public static class InputParameterCalculationService
     {
         /// <summary>
-        /// The <see cref="IPipingSubCalculatorFactory"/> to use for creating piping sub calculators.
+        /// Calculates the thickness of the coverage layer based on the values of partial piping input.
         /// </summary>
-        public static IPipingSubCalculatorFactory SubCalculatorFactory = new PipingSubCalculatorFactory();
-
-        /// <summary>
-        /// Calculates the thickness of the coverage layer based on the values of the <see cref="Ringtoets.Piping.Data.PipingInput"/>.
-        /// </summary>
         /// <param name="waterVolumetricWeight">The volumetric weight of water.</param>
         /// <param name="phreaticLevelExit">The design value of the phreatic level at the exit point.</param>
         /// <param name="exitPointL">The l-coordinate of the exit point.</param>
@@ -73,7 +71,7 @@
                     surfaceLine,
                     soilProfile
                     );
-                return new PipingCalculator(calculatorInput, SubCalculatorFactory).CalculateThicknessCoverageLayer();
+                return new PipingCalculator(calculatorInput, PipingSubCalculatorFactory.Instance).CalculateThicknessCoverageLayer();
             }
             catch (PipingCalculatorException)
             {
@@ -82,7 +80,7 @@
         }
 
         /// <summary>
-        /// Calculates the piezometric head at the exit point based on the values of the <see cref="Ringtoets.Piping.Data.PipingInput"/>.
+        /// Calculates the piezometric head at the exit point based on the values of partial piping input.
         /// </summary>
         /// <param name="assessmentLevel">The assessment level.</param>
         /// <param name="dampingFactorExit">The design value of the damping factor at exit point.</param>
@@ -116,7 +114,7 @@
                 null,
                 null
                 );
-            return new PipingCalculator(calculatorInput, SubCalculatorFactory).CalculatePiezometricHeadAtExit();
+            return new PipingCalculator(calculatorInput, PipingSubCalculatorFactory.Instance).CalculatePiezometricHeadAtExit();
         }
     }
 }
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