A flange is an external or internal ridge, or rim (lip), for strength, as the flange of an iron beam such as an I-beam or a T-beam; or for attachment to another object, as the flange on the end of a pipe, steam cylinder, etc., or on the lens mount of a camera; or for a flange of a rail car or tram wheel. Thus flanged wheels are wheels with a flange on one side to keep the wheels from running off the rails.

Surface Treatment: Anti-rust Oil, Transparent/ Yellow/Black Anti-rust Paint, Zinc, Hot dipped Galvanized.

There are many different flange standards to be found worldwide. To allow easy functionality and inter-changeability, these are designed to have standardised dimensions. Common world standards include ASA/ANSI/ASME (USA), PN/DIN (European), BS10 (British/Australian), and JIS/KS (Japanese/Korean).

In most cases these are not interchangeable (e.g. an ANSI/ASME flange will not mate against a JIS flange). Further, many of the flanges in each standard are divided into "pressure classes", allowing flanges to be capable of taking different pressure ratings. Again these are not generally interchangeable (e.g. an ANSI/ASME 150 will not mate with an ANSI/ASME 300).

These pressure classes also have differing pressure and temperature ratings for different materials. Unique pressure classes for piping can also be developed for a process plant or power generating station; these may be specific to the corporation, engineering procurement and construction (EPC) contractor, or the process plant owner. The ANSI/ASME pressure classes for Flat-Face flanges are 125# and 250#. The classes for Ring-Joint, Tongue & Groove, and Raised-Face flanges are 150#, 300#, (400#-unusual), 600#, 900#, 1500#, and 2500#.

The flange faces are also made to standardized dimensions and are typically "flat face", "raised face", "tongue and groove", or "ring joint" styles, although other obscure styles are possible.

Flange designs are available as "weld neck", "slip-on", "lap joint", "socket weld", " threaded", and also "blind".

Weld Neck Flange (WN), Long Welding Neck Flange (LWN), Lap Joint Flange (LJ), Blind Flange / Blank Flange (BL), Slip On Flange (SO), Thread Flange (THR), Socket Weld Flange (SW), Reducing Flange, Orifice Flange, Anchor Flange, Spectacle Blind Flange (Figue 8), Spacer Ring/Spade Flange etc.

Flange Standards:

ANSI/ASME Standard: ANSI B16.5, ANSI B16.47 Series A & B, MSS-SP-44, API 605, API6A in class 150 to 2500; AWWA C207 flanges in Class B, Class D, Class E, Class F, Ring, Blind & Hub;

European DIN, UNI, EN 1092-1, BS 4504, ISO, NS, NFE29203 flanges in Pressure PN6 to PN100;

Japanese JIS B2220 & Korean KS B1503 flanges in pressure 5K to 40K;

Russian GOST 12820-80, GOST 12821-80, GOST 12815-80 in pressure PN0.6MPa to PN10MPa;South African SABS 1123 / SANS 1123 in Class 600kPa to 4000kPa.

Flange Materials:

Carbon Steel:  ASTM A105/A105N              A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2              A694 F42, F46, F48, F50, F52, F56, F60, F65, F70             A516.60, 65, 70 (Spectacle Blind Flange, Spacer Ring/Spade Flange)             Steel RST37.2, C22.8Stainless Steel: ASTM A182 F304/304L, F316/316L, F316H, F316TI, F310, F321;

Alloy Steel: ASTM A182 F1, F5, F9, F11, F22, F91

Duplex & Super Duplext Steel: ASTM A182 F51/UNS S31803, A182 F53/UNS S32750

ASTM A182 F55 / UNS S3260

Flange Face Type: Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)Flange Norminal Diameter Range: 1/2"-96", DN15-DN2000 Normail Pressure Range: 150#-2500# (PN6-PN40)

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