Nozzles slip-on vs RFWN
Nozzles slip-on vs RFWN
(OP)
While designing tanks we always specify raised face welded neck (RFWN) type. However, one of the manufacturers suggested using slip on type, as they are less expensive. The mechanical stresses the nozzles are subject to are not considerable. In any event, the welding for the slip-on type should have more mechanical resistance anyway.
Would it be better to change to slip-on instead or RFWN?
Would it be better to change to slip-on instead or RFWN?





RE: Nozzles slip-on vs RFWN
RE: Nozzles slip-on vs RFWN
Regards,
Mike
RE: Nozzles slip-on vs RFWN
RE: Nozzles slip-on vs RFWN
You can get weld neck and slip on flanges in both flat face and raised face- the face style isn't dictated by the weld style (although availability may vary). You can get slip-on flanges in both plate style and hub-type- see API-650 or AWWA C207.
RE: Nozzles slip-on vs RFWN
Secondly If the pipe system is made up from flanged straights and flanged bends / tees then the bends & tees must be Weld necks , partly cos the items then remain conforming to standard dimensions and also, because often physically, you cannot put a s/o flange onto a tee or a bend.
Cheers DW