ASTM A105 paddle blank and spacer ANSI B16.48/API 590
Flange TypeWN/welding neck flange;SO/slip on flange;PL /Plate flange;BL/Blind flange;Th/Threaded flange;SW/socket welding flange;LF/SE(lapped flange/stub end);LWN/long welding neck flange;Orifice flange;Reducing flange;API flange;I
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