FUI International

Global Industrial Manufacturing Group · Flange Systems

Product Overview

We supply industrial flanges and related forgings for piping, valves, pumps and equipment. Products are manufactured to international standards with traceable material and NDT. Standard identification on flanges and packing (e.g. Class 150-8, DN 25) supports correct selection and delivery.

Main Flange Types

TypeCodeDescription
Threaded FlangeTHThreaded bore for screw connection; no welding.
Plate FlangePlateFlat ring with centre bore and bolt holes.
Slip-On FlangeSOSlips over pipe; fillet weld both sides. Common for lower pressure.
Welding Neck FlangeWNTapered hub butt-welded to pipe; best for high pressure and critical service.
Long Weld Neck FlangeLWNExtended neck for vessel nozzles and special layouts.
Blind FlangeBLSolid disc to close pipe end; same bolt circle as matching flanges.
Socket Welding FlangeSWPipe inserted into socket and fillet welded; compact.
Special FlangeSpecialNon-standard dimensions or geometry to order.

Specification Summary

ItemRange
Size (inch)½" – 80"
Size (DN)DN15 – DN2000
Pressure classASME Class 150 – 2500
PN ratingEN PN6 – PN400
Face typesRF / RTJ (as applicable)
StandardsASME B16.5, B16.47, EN 1092-1, DIN, JIS
MaterialsA105, LF2, F11/F22, 304/316 and equivalents — see full spec for grades

Wind power flanges, flange packing (gaskets), and ring forgings for custom machining are also available. For material grades and full model list, refer to the Flange Spec page on our website.