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WN FLANGES

   

 

 

products

WELDING NECK FLANGES

Material Grade

Gr1      Gr2       Gr3       Gr4        GR5       Gr7       Gr9       Gr11

Certification   

ISO9001:2008        Alibaba.com Assessed Supplier

Standard

ANSI B16.5     ASTM B16.5      ASME B16.47       JIS B2220        DIN2627-2628      
AWWA      ASTM A182 AND ASME SA182

size

1/2"~ 60"NB NPS 1/2 - NPS 24 (DN 10 - 2000) 

Pressure Class

PN0.25~32Mpa

(DIN)   PN6       PN10       PN16       PN25       though       PN250

150#      250#     300#     400#      500#      600#      900#      1500#      2500#

Technique

Forged and CNC Machined

type

Weldnecks Slip-Ons Threaded Blind Socketweld and Lap-Joint

Flange surface

FF       RF       TG       RJ       MFM

 

WELDING NECK FLANGES are distinguished from other types by their long tapered hub and gentle transition of thickness in the region of the butt weld joining them to the pipe. The long tapered hub provides an important reinforcement of the flange proper from the standpoint of strength and resistance to dishing. The smooth transition from flange thickness to pipe wall thickness effected by the taper is extremely beneficial under conditions of repeated bending, caused by line expansion or other variable forces and produces an endurance strength of welding neck flanged assemblies equivalent to that of a butt welded joint between pipes, which, in practice, is the same as that of unwelded pipe. Thus this type of flange is preferred for every severe service condition, whether this results from high pressure or from sub-zero or elevated temperature, and whether loading conditions are substantially constant or fluctuate between wide limits.