The LWN or Long Weld(ing) Neck Flange is available through 24" sizes meeting the ASME B16.5 standard (all pressure classes). FVC can also meet the specifications of ASME B16.47, Series A & Series B. FVC maintains a large inventory of SA105 and some inventory of SA350-LF2, SA182-F11, and SA182-F22. Modified versions of the LWN can also be furnished as a "custom" product.
The LWN is FVC's basic standard flanged connection. This seamless product offers a nominal bore as well as a heavy wall thickness making it ideal for highly corrosive applications.