A flange (FLG) is a bolted connection where two pieces of pipe, equipment, fittings or valves can be connected together. They come in different styles, pressure ratings and sizes to meet the design requirements. The two most commonly used flange standards are ANSI/ASME B16.5 and BS 1560. The third is API Spec 6A which is for flanges used on wellhead and Christmas tree equipment.
There are different types of flanges available for use. Depending on the service the line is being used for will dictate the flange material to be used. Referencing the proper specification will provide this information. This is why it is always important to have up to date P&ID’s to help with the identification.
Flanges of different standards are not normally joined together. But if need be, seek engineering advise to ensure that the flanges are compatible.
There are six basic types of flanges:
Blind Flange (BF) – Lap Joint Flange (LJF) – Slip-on Flange (SOF) – Socket Weld Flange (SWF) – Threaded Flange (THDF) – Weld Neck Flange (WNF)
All these flanges come normally with a raised flange face (unless otherwise specified flat flange face) except the lap joint flange which has a flat flange face.
There are also a number of special flanges:
- Orifice Flanges: Orifice Slip-on Flange – Orifice Socket Flange – Orifice Threaded Flange – Orifice Weld Neck Flange
- Standard Connections: Long Weld Neck Flange – Heavy Barrel Flange – Full Barrel Flange
- Ring Type Joint Flanges: RTJ Blind Flange – RTJ Slip-On Flange – RTJ Threaded Flange – RTJ Weld Neck Flange
- Expander Flange
- Reducing Flange
- Studding Outlet: Flat Bottom Mount – Shell/Head Mount – Tangential Mount
- Weldoflange / Nipoflange
- Orifice Plate (part for orifice flange)
- Spectacle Blind (part for flange)
ITOK TEJARAT ARMAN is a reputable source for all your industrial needs for flanges in different size and material.
- ANSI Standards:
ANSI B16.5, ANSI B16.47 A, ANSI B16.47 B. - ASTM Standards:
ASTM A105, ASTM A350LF2, ASTM A182 F11, ASTM A182 F304/F304L, ASTM F316/F316L. - BSI Standards:
BS3293, BS4504, BS10, BS970, BS4360, BS 1503-224 GR.410, BS 1503-304S11, BS1501-161 GR.B C BS1633.
