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"4. The seat in the flange must provide adequate clearances for the window during assembly at 75 degrees F (240C) to allow for expansion of the window at highest expected temperature during shipment, or outdoor storage of the vessel." Page 5 Dr. Jerry D. Stachiw PE, Fellow ASME STACHIW ASSOCIATES http://www.hydroports.com/documents/New_Orleans_Meeting-Feb_2004.pdf Regards, Szybowski |