Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Application.Ringtoets.Storage.csproj
===================================================================
diff -u -r2a585c57b57dac62d39293e51dda15c7392305de -r70e6f175074b3d62532adfda735e6f719602f3b1
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Application.Ringtoets.Storage.csproj	(.../Application.Ringtoets.Storage.csproj)	(revision 2a585c57b57dac62d39293e51dda15c7392305de)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Application.Ringtoets.Storage.csproj	(.../Application.Ringtoets.Storage.csproj)	(revision 70e6f175074b3d62532adfda735e6f719602f3b1)
@@ -531,6 +531,7 @@
     <Compile Include="DbContext\FailureMechanismType.cs" />
     <Compile Include="Read\AssessmentSectionEntityReadExtensions.cs" />
     <Compile Include="Read\ProjectEntityReadExtensions.cs" />
+    <Compile Include="Serializers\TangentLinesXmlSerializer.cs" />
     <Compile Include="StorageSqliteCreator.cs" />
     <Compile Include="DbContext\PartialRingtoetsEntities.cs" />
     <Compile Include="Exceptions\EntityNotFoundException.cs" />
Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Serializers/DataCollectionSerializer.cs
===================================================================
diff -u -r2a585c57b57dac62d39293e51dda15c7392305de -r70e6f175074b3d62532adfda735e6f719602f3b1
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Serializers/DataCollectionSerializer.cs	(.../DataCollectionSerializer.cs)	(revision 2a585c57b57dac62d39293e51dda15c7392305de)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Serializers/DataCollectionSerializer.cs	(.../DataCollectionSerializer.cs)	(revision 70e6f175074b3d62532adfda735e6f719602f3b1)
@@ -29,10 +29,10 @@
 namespace Application.Ringtoets.Storage.Serializers
 {
     /// <summary>
-    /// Converter class that converts between a collection of <see cref="TSerializedData"/> and an XML representation of that data.
+    /// Converter class that converts between a collection of <see cref="TSerializedData"/> and 
+    /// an XML representation of that data.
     /// </summary>
     internal abstract class DataCollectionSerializer<TData, TSerializedData>
-        where TData : class
         where TSerializedData : class
     {
         private static readonly Type serializationRootType = typeof(TSerializedData[]);
Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Serializers/TangentLinesXmlSerializer.cs
===================================================================
diff -u
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Serializers/TangentLinesXmlSerializer.cs	(revision 0)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Serializers/TangentLinesXmlSerializer.cs	(revision 70e6f175074b3d62532adfda735e6f719602f3b1)
@@ -0,0 +1,64 @@
+// Copyright (C) Stichting Deltares 2017. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Application.Ringtoets.Storage.Serializers
+{
+    /// <summary>
+    /// Converter class that converts between tangent lines and an XML representation of that data.
+    /// </summary>
+    internal class TangentLinesXmlSerializer : DataCollectionSerializer<double, TangentLinesXmlSerializer.SerializableTangentLine>
+    {
+        protected override SerializableTangentLine[] ToSerializableData(IEnumerable<double> elements)
+        {
+            return elements.Select(e => new SerializableTangentLine(e)).ToArray();
+        }
+
+        protected override double[] FromSerializableData(IEnumerable<SerializableTangentLine> serializedElements)
+        {
+            return serializedElements.Select(se => se.ToTangentLine()).ToArray();
+        }
+
+        [Serializable]
+        internal class SerializableTangentLine
+        {
+            private readonly double tangentLine;
+
+            /// <summary>
+            /// Creates a new instance of <see cref="SerializableTangentLine"/>.
+            /// </summary>
+            /// <param name="tangentLine">The <see cref="double"/> to base the 
+            /// <see cref="SerializableTangentLine"/> on.</param>
+            public SerializableTangentLine(double tangentLine)
+            {
+                this.tangentLine = tangentLine;
+            }
+
+            public double ToTangentLine()
+            {
+                return tangentLine;
+            }
+        }
+    }
+}
\ No newline at end of file
Index: Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Application.Ringtoets.Storage.Test.csproj
===================================================================
diff -u -r2a585c57b57dac62d39293e51dda15c7392305de -r70e6f175074b3d62532adfda735e6f719602f3b1
--- Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Application.Ringtoets.Storage.Test.csproj	(.../Application.Ringtoets.Storage.Test.csproj)	(revision 2a585c57b57dac62d39293e51dda15c7392305de)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Application.Ringtoets.Storage.Test.csproj	(.../Application.Ringtoets.Storage.Test.csproj)	(revision 70e6f175074b3d62532adfda735e6f719602f3b1)
@@ -274,6 +274,7 @@
     <Compile Include="IntegrationTests\StorageSqLiteIntegrationTest.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="BackedUpFileWriterTest.cs" />
+    <Compile Include="Serializers\TangentLinesXmlSerializerTest.cs" />
     <Compile Include="SqLiteEntityConnectionStringBuilderTest.cs" />
     <Compile Include="StorageSqliteCreatorTest.cs" />
     <Compile Include="StorageSqLiteTest.cs" />
Index: Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Serializers/TangentLinesXmlSerializerTest.cs
===================================================================
diff -u
--- Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Serializers/TangentLinesXmlSerializerTest.cs	(revision 0)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Serializers/TangentLinesXmlSerializerTest.cs	(revision 70e6f175074b3d62532adfda735e6f719602f3b1)
@@ -0,0 +1,61 @@
+// Copyright (C) Stichting Deltares 2017. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using Application.Ringtoets.Storage.Serializers;
+using NUnit.Framework;
+
+namespace Application.Ringtoets.Storage.Test.Serializers
+{
+    [TestFixture]
+    public class TangentLinesXmlSerializerTest
+    {
+        [Test]
+        public void Constructor_ExpectedValues()
+        {
+            // Call
+            var serializer = new TangentLinesXmlSerializer();
+
+            // Assert
+            Assert.IsInstanceOf<DataCollectionSerializer<double, TangentLinesXmlSerializer.SerializableTangentLine>>(serializer);
+        }
+
+        [Test]
+        public void GivenArrayOfTangentLines_WhenConvertingRoundTrip_ThenEqualTangentLines()
+        {
+            // Given
+            var random = new Random(31);
+            var original = new[]
+            {
+                double.NaN,
+                random.NextDouble()
+            };
+            var serializer = new TangentLinesXmlSerializer();
+
+            // When
+            string xml = serializer.ToXml(original);
+            double[] roundtripResult = serializer.FromXml(xml);
+
+            // Then
+            CollectionAssert.AreEqual(original, roundtripResult);
+        }
+    }
+}
\ No newline at end of file