diff --git a/ApplicationCode/Commands/SummaryPlotCommands/RicSummaryCurveCreatorDialog.cpp b/ApplicationCode/Commands/SummaryPlotCommands/RicSummaryCurveCreatorDialog.cpp
index ee4662102d..0f4b59a0ba 100644
--- a/ApplicationCode/Commands/SummaryPlotCommands/RicSummaryCurveCreatorDialog.cpp
+++ b/ApplicationCode/Commands/SummaryPlotCommands/RicSummaryCurveCreatorDialog.cpp
@@ -84,5 +84,4 @@ void RicSummaryCurveCreatorDialog::slotDialogFinished()
     {
         plotwindow->cleanUpTemporaryWidgets();
     }
-    RifReaderEclipseSummary::purgeCache();
 }
diff --git a/ApplicationCode/FileInterface/RifReaderEclipseSummary.cpp b/ApplicationCode/FileInterface/RifReaderEclipseSummary.cpp
index fec6599481..5b78dd74cf 100644
--- a/ApplicationCode/FileInterface/RifReaderEclipseSummary.cpp
+++ b/ApplicationCode/FileInterface/RifReaderEclipseSummary.cpp
@@ -570,14 +570,6 @@ void RifReaderEclipseSummary::markForCachePurge( const RifEclipseSummaryAddress&
     m_valuesCache->markAddressForPurge( address );
 }
 
-//--------------------------------------------------------------------------------------------------
-///
-//--------------------------------------------------------------------------------------------------
-void RifReaderEclipseSummary::purgeCache()
-{
-    ValuesCache::purge();
-}
-
 #if 0
 //--------------------------------------------------------------------------------------------------
 /// 
@@ -597,26 +589,17 @@ void RifReaderEclipseSummary::populateVectorFromStringList(stringlist_type* stri
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
-const std::vector<double>                       RifReaderEclipseSummary::ValuesCache::EMPTY_VECTOR;
-std::set<RifReaderEclipseSummary::ValuesCache*> RifReaderEclipseSummary::ValuesCache::m_instances;
+const std::vector<double> RifReaderEclipseSummary::ValuesCache::EMPTY_VECTOR;
 
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
-RifReaderEclipseSummary::ValuesCache::ValuesCache()
-{
-    // Register instance
-    m_instances.insert( this );
-}
+RifReaderEclipseSummary::ValuesCache::ValuesCache() {}
 
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
-RifReaderEclipseSummary::ValuesCache::~ValuesCache()
-{
-    // Deregister instance
-    m_instances.erase( this );
-}
+RifReaderEclipseSummary::ValuesCache::~ValuesCache() {}
 
 //--------------------------------------------------------------------------------------------------
 ///
@@ -648,15 +631,6 @@ void RifReaderEclipseSummary::ValuesCache::markAddressForPurge( const RifEclipse
     m_purgeList.insert( address );
 }
 
-//--------------------------------------------------------------------------------------------------
-///
-//--------------------------------------------------------------------------------------------------
-void RifReaderEclipseSummary::ValuesCache::purge()
-{
-    for ( auto instance : m_instances )
-        instance->purgeData();
-}
-
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationCode/FileInterface/RifReaderEclipseSummary.h b/ApplicationCode/FileInterface/RifReaderEclipseSummary.h
index 4e8abecdc0..412ac5d6d4 100644
--- a/ApplicationCode/FileInterface/RifReaderEclipseSummary.h
+++ b/ApplicationCode/FileInterface/RifReaderEclipseSummary.h
@@ -84,8 +84,7 @@ public:
         return m_warnings;
     }
 
-    void        markForCachePurge( const RifEclipseSummaryAddress& address ) override;
-    static void purgeCache();
+    void markForCachePurge( const RifEclipseSummaryAddress& address ) override;
 
 private:
     int                timeStepCount() const;
@@ -122,15 +121,12 @@ 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 );
-        static void                purge();
 
     private:
         void purgeData();
 
         std::map<const RifEclipseSummaryAddress, std::vector<double>> m_cachedValues;
         std::set<RifEclipseSummaryAddress>                            m_purgeList;
-
-        static std::set<ValuesCache*> m_instances;
     };
 
     std::unique_ptr<ValuesCache> m_valuesCache;