Weld Neck Flange is a flange that transfers pressure or stress to the flange, which goes to the tube through the strong neck area. There is no need to worry about cracks in the weld joints. It can occur with weld and slip-on flanges. This special design makes this type of flange expensive and is often used in applications where high pressure is an important factor.

This type of flange is used for large pipes and assembling or installing use butt weld method. It is possible to check the integrity of the weld by a radiographic method.

This high neck flange is available in both raised face and flat-faced versions. Fu Thai Pipe’s high neck flange is available in various sizes. Manufactured from a wide range of material grades and properties. It also has a robust construction to withstand high or fluctuating temperatures and pressures that meet all your purposes of use.
 
Ratings of weld neck flanges
American type: CLASS 150, CLASS 300, CLASS 400, CLASS 600, CLASS 900 และ CLASS 1500
European type: PN 6, PN 10, PN 16, PN 25, PN 40, PN 63 และ PN 100
 
Type of flange surface
Flat Face (FF), Raised face (RF), Tongue (T), Groove (G), Female (F), Male (M), Ring Joint (RJ)

​Material of weld neck flange
Carbon Steel: A105
Stainless Steel: A182 304-304H-304L-316-316L

Standard of the weld neck flange
GB/T9112-2000,GB/T9115.1-2000, GB/T9115.2-2000, GB/T9115.3-2000, GB/T9115.4-2000, GB/T9124-2000, GB/T13402-1992
SH/T3406-1996
GD2000 GD87-1101
JB/T74-1994, JB/T75-1994, JB/T82.1-1994, JB/T82.2-1994, JB/T82.3-1994, JB/T82.4-1994
HG/T20592-2009, HG/T20614-2009, HG/T20615-2009, HG/T20623-2009, HG/T20635-2009
ASME B16.5-2009, ASME B16.47-2006
API605-1988
MSS SP 44-2006
CSA Z245.12-05-2005
EN1092-1-2007, EN1759-1-2004
DIN2630, DIN2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638
BS1560-3.1-1989, BS4504-3.1-1989
AFNOR NF E29-200-1-2007
ISO7005-1-1992
AS2129-2000
JIS B2220-2004