WELDING NECK, SLIP ON, BLIND, SCREWED, SOCKET WELD, LAP JOINT, REDUCING, ORIFICE FLANGES, LONG WELDING NECK.
DIMENSIONS: ANSI B16.5 Rating: 150 - 300 - 400 - 600 - 900 - 1500 - 2500 lbs.
OTHER STANDARDS: ASME B16.47 - BS 3293 - B16.36 – DIN – AWWA – UNI EN – API - ISO
OTHER PRODUCTS: Stub Ends, Spectacle Blinds, Ring Spacers, Single Blinds, Drip Rings.
MATERIALS: ASTM A105 – A350LF2 A182 Austenitic grades and ferrite grades, Nickel, Cupro Nickel, Nickel - Chromium Alloy.
A flange is a forged or cast ring of steel designed to connect sections of pipe or join pipe to a pressure Vessel, pump or any other integral flanges assembly.
Flanges are joined to each other by bolting and joined to the piping system by welding or threading.
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 styles, although other obscure styles are possible.
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