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� OPRA Small ID Noted as the PW or Pipe Wall Style: � � � All OPRA element of the OPRA PW gasket is positioned as close as possible to the flange ID. The ID of OPRA PW gaskets range from 1/8" larger than the nominal pipe size (NPS �" � NPS 3) to �" larger than the nominal pipe size (NPS 4 � NPS 8) to 3/8" larger then the nominal pipe size (NPS 10 � NPS 24). 1) The width of the sealing area ranges from �" wide for NPS � - NPS 3, 5/8" wide for NPS 4 � NPS 8 and �" wide for NPS 10 � NPS 24. � 2) Instead of having a standard bolt hole pattern, OPRA PW gaskets have a slot for each bolt. The OD of the slot aligns the gasket correctly on the flange. Replacing the standard bolt hole with a slot is another means of reducing the gasket contact area. � 3) OPRA PW gaskets are our standard design for standard pipe flanges � OPRA Large ID Noted as the BC or Bolt Circle Style: � 1) The sealing area of the OPRA BC gasket is positioned as close as possible to the inside edge of the bolt holes. � 2) The width of the sealing area is �" for all OPRA BC gasket sizes. � 3) OPRA BC gaskets are a design option that can be used with non-standard gaskets � specifically large diameter vessel gaskets. Selection: � � 1) OPRA PW design is the standard for pipe flanges; however, the OPRA BC pipe flange gaskets are available if necessary. � 2) OPRA gaskets can be custom designed for any non-standard piping or vessel flange. Information required for design is: Vessel Flange ID, OD, and BCD. Number of bolts, diameter of bolt, assembly torque recommended and flange profile (smooth, grooved, serrated, etc).
Goodyear Rubber Products
