diff --git a/ApplicationCode/FileInterface/RifReaderEclipseSummary.cpp b/ApplicationCode/FileInterface/RifReaderEclipseSummary.cpp
index 393dc47139..a2c7307aac 100644
--- a/ApplicationCode/FileInterface/RifReaderEclipseSummary.cpp
+++ b/ApplicationCode/FileInterface/RifReaderEclipseSummary.cpp
@@ -638,30 +638,6 @@ RiaEclipseUnitTools::UnitSystem RifReaderEclipseSummary::unitSystem() const
     return m_unitSystem;
 }
 
-//--------------------------------------------------------------------------------------------------
-///
-//--------------------------------------------------------------------------------------------------
-void RifReaderEclipseSummary::markForCachePurge( const RifEclipseSummaryAddress& address )
-{
-    m_valuesCache->markAddressForPurge( address );
-}
-
-#if 0
-//--------------------------------------------------------------------------------------------------
-/// 
-//--------------------------------------------------------------------------------------------------
-void RifReaderEclipseSummary::populateVectorFromStringList(stringlist_type* stringList, std::vector<std::string>* strings)
-{
-    assert(stringList && strings);
-
-    for (int i = 0; i < stringlist_get_size(stringList); i++)
-    {
-        strings->push_back(stringlist_iget(stringList, i));
-    }
-}
-
-#endif
-
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
@@ -688,7 +664,6 @@ void RifReaderEclipseSummary::ValuesCache::insertValues( const RifEclipseSummary
                                                          const std::vector<double>&      values )
 {
     m_cachedValues[address] = values;
-    m_purgeList.erase( address );
 }
 
 //--------------------------------------------------------------------------------------------------
@@ -702,23 +677,3 @@ const std::vector<double>& RifReaderEclipseSummary::ValuesCache::getValues( cons
     }
     return EMPTY_VECTOR;
 }
-
-//--------------------------------------------------------------------------------------------------
-///
-//--------------------------------------------------------------------------------------------------
-void RifReaderEclipseSummary::ValuesCache::markAddressForPurge( const RifEclipseSummaryAddress& address )
-{
-    m_purgeList.insert( address );
-}
-
-//--------------------------------------------------------------------------------------------------
-///
-//--------------------------------------------------------------------------------------------------
-void RifReaderEclipseSummary::ValuesCache::purgeData()
-{
-    for ( const auto& purgeAddr : m_purgeList )
-    {
-        m_cachedValues.erase( purgeAddr );
-    }
-    m_purgeList.clear();
-}
diff --git a/ApplicationCode/FileInterface/RifReaderEclipseSummary.h b/ApplicationCode/FileInterface/RifReaderEclipseSummary.h
index 63b0c0979f..e101ef4377 100644
--- a/ApplicationCode/FileInterface/RifReaderEclipseSummary.h
+++ b/ApplicationCode/FileInterface/RifReaderEclipseSummary.h
@@ -78,8 +78,6 @@ public:
     RiaEclipseUnitTools::UnitSystem unitSystem() const override;
     QStringList                     warnings() const { return m_warnings; }
 
-    void markForCachePurge( const RifEclipseSummaryAddress& address ) override;
-
     static std::string       differenceIdentifier() { return "_DIFF"; }
     static const std::string historyIdentifier() { return "H"; }
 
@@ -119,13 +117,9 @@ private:
 
         void insertValues( const RifEclipseSummaryAddress& address, const std::vector<double>& values );
         const std::vector<double>& getValues( const RifEclipseSummaryAddress& address ) const;
-        void                       markAddressForPurge( const RifEclipseSummaryAddress& address );
 
     private:
-        void purgeData();
-
         std::map<const RifEclipseSummaryAddress, std::vector<double>> m_cachedValues;
-        std::set<RifEclipseSummaryAddress>                            m_purgeList;
     };
 
     std::unique_ptr<ValuesCache> m_valuesCache;
diff --git a/ApplicationCode/FileInterface/RifSummaryReaderInterface.h b/ApplicationCode/FileInterface/RifSummaryReaderInterface.h
index 09fa1e0336..84a6ce5d53 100644
--- a/ApplicationCode/FileInterface/RifSummaryReaderInterface.h
+++ b/ApplicationCode/FileInterface/RifSummaryReaderInterface.h
@@ -51,8 +51,6 @@ public:
     virtual std::string                     unitName( const RifEclipseSummaryAddress& resultAddress ) const = 0;
     virtual RiaEclipseUnitTools::UnitSystem unitSystem() const                                              = 0;
 
-    virtual void markForCachePurge( const RifEclipseSummaryAddress& address ) {}
-
 protected:
     std::set<RifEclipseSummaryAddress> m_allResultAddresses; // Result and error addresses
     std::set<RifEclipseSummaryAddress> m_allErrorAddresses; // Error addresses
diff --git a/ApplicationCode/ProjectDataModel/Summary/RimEnsembleCurveSet.cpp b/ApplicationCode/ProjectDataModel/Summary/RimEnsembleCurveSet.cpp
index f231e66e78..b4542a73da 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimEnsembleCurveSet.cpp
+++ b/ApplicationCode/ProjectDataModel/Summary/RimEnsembleCurveSet.cpp
@@ -383,7 +383,6 @@ void RimEnsembleCurveSet::deleteCurve( RimSummaryCurve* curve )
     if ( curve )
     {
         m_curves.removeChildObject( curve );
-        curve->markCachedDataForPurge();
         delete curve;
     }
 }
@@ -1808,17 +1807,6 @@ void RimEnsembleCurveSet::showCurves( bool show )
     m_showCurves = show;
 }
 
-//--------------------------------------------------------------------------------------------------
-///
-//--------------------------------------------------------------------------------------------------
-void RimEnsembleCurveSet::markCachedDataForPurge()
-{
-    for ( const auto& curve : m_curves )
-    {
-        curve->markCachedDataForPurge();
-    }
-}
-
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationCode/ProjectDataModel/Summary/RimEnsembleCurveSet.h b/ApplicationCode/ProjectDataModel/Summary/RimEnsembleCurveSet.h
index ed633a8488..cb0d3c333b 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimEnsembleCurveSet.h
+++ b/ApplicationCode/ProjectDataModel/Summary/RimEnsembleCurveSet.h
@@ -126,8 +126,6 @@ public:
     RimEnsembleCurveSet* clone() const;
     void                 showCurves( bool show );
 
-    void markCachedDataForPurge();
-
     void                           updateAllTextInPlot();
     std::vector<EnsembleParameter> variationSortedEnsembleParameters() const;
 
diff --git a/ApplicationCode/ProjectDataModel/Summary/RimEnsembleCurveSetCollection.cpp b/ApplicationCode/ProjectDataModel/Summary/RimEnsembleCurveSetCollection.cpp
index 9dee9d641b..a996a3ddf9 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimEnsembleCurveSetCollection.cpp
+++ b/ApplicationCode/ProjectDataModel/Summary/RimEnsembleCurveSetCollection.cpp
@@ -193,7 +193,6 @@ void RimEnsembleCurveSetCollection::deleteCurveSets( const std::vector<RimEnsemb
     for ( const auto curveSet : curveSets )
     {
         m_curveSets.removeChildObject( curveSet );
-        curveSet->markCachedDataForPurge();
         delete curveSet;
     }
 }
diff --git a/ApplicationCode/ProjectDataModel/Summary/RimSummaryCurve.cpp b/ApplicationCode/ProjectDataModel/Summary/RimSummaryCurve.cpp
index 760ad1c31f..e7d99114cc 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimSummaryCurve.cpp
+++ b/ApplicationCode/ProjectDataModel/Summary/RimSummaryCurve.cpp
@@ -971,15 +971,6 @@ void RimSummaryCurve::setCurveAppearanceFromCaseType()
     }
 }
 
-//--------------------------------------------------------------------------------------------------
-///
-//--------------------------------------------------------------------------------------------------
-void RimSummaryCurve::markCachedDataForPurge()
-{
-    auto reader = valuesSummaryReaderY();
-    if ( reader ) reader->markForCachePurge( m_yValuesSummaryAddress->address() );
-}
-
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationCode/ProjectDataModel/Summary/RimSummaryCurve.h b/ApplicationCode/ProjectDataModel/Summary/RimSummaryCurve.h
index 2f44d84211..808a9334b9 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimSummaryCurve.h
+++ b/ApplicationCode/ProjectDataModel/Summary/RimSummaryCurve.h
@@ -91,8 +91,6 @@ public:
     QString curveExportDescription( const RifEclipseSummaryAddress& address = RifEclipseSummaryAddress() ) const override;
     void    setCurveAppearanceFromCaseType();
 
-    void markCachedDataForPurge();
-
     void setAsTopZWithinCategory( bool enable );
     void setZIndexFromCurveInfo();
 
diff --git a/ApplicationCode/ProjectDataModel/Summary/RimSummaryCurveCollection.cpp b/ApplicationCode/ProjectDataModel/Summary/RimSummaryCurveCollection.cpp
index 80ac95d7e5..af17f5a603 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimSummaryCurveCollection.cpp
+++ b/ApplicationCode/ProjectDataModel/Summary/RimSummaryCurveCollection.cpp
@@ -206,7 +206,6 @@ void RimSummaryCurveCollection::deleteCurve( RimSummaryCurve* curve )
     removeCurve( curve );
     if ( curve )
     {
-        curve->markCachedDataForPurge();
         delete curve;
     }
 }