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Steam condensate return pump
I maintain a steam boiler at our local Catholic school. My charity work. I have been having problems with leaking pumps for the last 3-years on the Hoffman condensate return tank. I am also going down there and the pump is always running but not pumping. I have replaced the check valve and installed a bleeder valve which as soon as I open it the pump takes off and starts pumping return water back to boiler. The return is connected to Hartford loop at boiler. I am getting sick of changing leaking pumps. I ended up buying a spare so I always had one to replace the leakier why I have the other repaired. Any suggestion why the pump is air locking and burning up the seals