Installation of Penetration Flanges in QUALITY CONTROL STEEL TANKS A penetration flange set consists of an outer flange and an inner flange or seal flange, a gasket, hex head cap screws and seal washers. Most sets are produced from schedule 80 PVC fittings unless otherwise specified for a particular project. Wall Mounted Flange Installation for Overflow or Inlet or Outlet 1. The outer flange is tapped to receive bolts inserted through the wall of the tank and also tapped to receive bolts from the inner flange or seal plate. 2. Locate the desired penetration location and mark the center of the hole. 3. Drill or cutout a hole through the tank wall that is large enough to allow the glue neck of the outer flange to pass through. 4. Place the outer flange neck into the hole from the outside of the tank and locate the bolt holes onto the tank wall. 5. Remove the outer flange and drill clearance holes for the wall mounting bolts. 6. Insert the outer flange neck into the hole in the tank wall from the inside of the tank. 7. Insert the wall mounting bolts from the outside of the tank wall through the tank wall and thread them into the tapped holes in the outer flange. This will keep the outer flange in place during liner installation. 8. Apply a bead of silicone sealant around the cutout at the glue neck of the outer flange on the outside of the tank wall to improve the appearance of the penetration. 9. After the preliner is installed inside the tank, cut the preliner back away from the face of the outer flange and tape the preliner to insure that is does not get between the flange face when the main liner is installed. 10. Install the main liner and check to be sure that it is hanging smoothly over the face of the outer flange. 11. Locate a tapped bolt hole in the outer flange through the main liner and cut out a hole in the liner to allow the bolt to pass through. Thread the bolt into the tapped hole a few turns only. 12. Smooth the liner across the face and locate another hole opposite of the first hole and repeat the procedure to install a second bolt. 13. Continue to locate and cut bolt holes in the liner and install bolts until all of the inner flange bolt holes have been cutout. 14. While bolts are still in place cut-out the center hole in the liner. 15. Remove the flange bolts. 16. Lift the liner away from the face of the outer flange and apply a bead of sealant to the outer flange face around each bolt hole and around the inner and outer perimeter of the flange face. 17. Lightly press the liner against the sealant and the outer flange face. 18. Apply another bead of sealant onto the liner. 19. Place the gasket onto the sealant. 20. Apply another bead of sealant onto the gasket. 21. Install sealing washers onto the flange bolts. 22. Place the inner flange against the gasket and liner and install the flange bolts. 23. Tighten bolts in a pattern working across the flange face until firm. Do not tighten to torque values that are normally used for flange connections. 24. Smooth and feather all sealant squeeze-out.
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