diff --git a/meshroom/core/node.py b/meshroom/core/node.py
index 969c7063..013d3753 100644
--- a/meshroom/core/node.py
+++ b/meshroom/core/node.py
@@ -551,6 +551,9 @@ class BaseNode(BaseObject):
     def alreadySubmittedChunks(self):
         return [ch for ch in self._chunks if ch.isAlreadySubmitted()]
 
+    def isExtern(self):
+        return self._chunks.at(0).isExtern()
+
     @Slot()
     def clearSubmittedChunks(self):
         """ Reset all submitted chunks to Status.NONE. This method should be used to clear inconsistent status
diff --git a/meshroom/core/taskManager.py b/meshroom/core/taskManager.py
index bfee84df..4e774470 100644
--- a/meshroom/core/taskManager.py
+++ b/meshroom/core/taskManager.py
@@ -155,7 +155,16 @@ class TaskManager(BaseObject):
         self._nodesExtern = []
         self._nodesToProcess = []
 
-
+    def update(self, graph):
+        """
+        Add all the nodes that are being rendered in a renderfarm to the taskmanager when new graph is loaded
+        :param graph:
+        :return:
+        """
+        for node in graph._nodes:
+            if node.isAlreadySubmitted() and node._chunks.size() > 0 and node.isExtern():
+                self._nodes.add(node)
+                self._nodesExtern.append(node)
 
     def submit(self, graph=None, submitter=None, toNodes=None):
         """