Flanges

Pipe flanges that are made to standards called out by ASME B16.5 or ASME B16.47 are typically made from forged materials and have machined surfaces.  B16.5 refers to nominal pipe sizes (NPS) from ½” to 24″.  B16.47 covers NPSs from 26″ to 60″.  Each specification further delineates flanges into pressure classes: 150, 300, 400, 600, 900, 1500 and 2500 for B16.5, and B16.47 delineates its flanges into pressure classes 75, 150, 300, 400, 600, 900.

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Description

FlangesThere are many different flanges standard to be found worldwide.  To allow easy functionality and interchangeability, these are designed to have standardized 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 interchangeable as most local standards have been aligned to ISO standards, however some local standards still differ (e.g. an ANSI/ASME flange will not mate against an ISO flange).

 

Flanges Pressure Class

 

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”.

 

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Pipe Fittings

Piping

Additional information

Weight1 lbs
Dimensions8 × 8 × 8 in
Size

1/2", 1", 1.5", 2", 3", 4", 6", 8", 12"

Connection Type

NPT Threaded, Socket, Slip-On

Materials of Construction

Carbon Steel, 304SS, 316SS

Specifications

UNKNOWN

Drawings

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Downloads

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