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Author Topic: Types of Steel Flanges  (Read 1625 times)

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Types of Steel Flanges
« on: June 27, 2013, 04:23:33 PM »
Flange Types

A Flange is a method of connecting pipes, valves, pumps and other equipment to form a pipework system. It also provides easy access for cleaning, inspection or modification. Flanges are usually welded or screwed into such systems and then joined with bolts.

Weld Neck Flange
This flange is circumferentially welded into the system at its neck which means that the integrity of the butt welded area can be easily examined by radiography.

The bores of both pipe and flange match, which reduces turbulence and erosion inside the pipeline. The weld neck is therefore favoured in critical applications
This flange is slipped over the pipe and then fillet welded. Slip-on flanges are easy to use in fabricated applications.

Blind Flange
This flange is used to blank off pipelines, valves and pumps, it can also be used as an inspection cover. It is sometimes referred to as a blanking flange.
Socket Weld
This flange is counter bored to accept the pipe before being fillet welded. The bore of the pipe and flange are both the same therefore giving good flow characteristics.

Threaded Flange
This flange is referred to as either threaded or screwed. It is used to connect other threaded components in low pressure, non-critical applications. No welding is required.
Lap Joint Flange
These flanges are always used with either a stub end or taft which is butt welded to the pipe with the flange loose behind it. This means the stub end or taft always
makes the face.

The lap joint is favoured in low pressure applications because it is easily assembled and aligned. To reduce cost these flanges can be supplied  without a hub and/or in treated, coated carbon steel.

Ring Type Joint
This is a method of ensuring leak proof flange connection at high pressures. A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal.

This jointing method can be employed on Weld Neck, Slip-on and Blind Flanges.

More information including relevant pictures can be found here

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Types of Steel Flanges
« on: June 27, 2013, 04:23:33 PM »

Offline carbonlisa

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Re: Types of Steel Flanges
« Reply #1 on: October 08, 2013, 02:54:06 AM »
According to different reference standard, flanges can be divided into types.
1, according to the chemical industry standard score: integral flange (IF), threaded flange (Th), plate flat welding flange (PL), welding neck flange (WN), with a neck flat welding flange (SO) , socket welding flange (SW), welding neck collar loose flange (PJ / SE), flat welding ring loose flange (PJ / RJ), lining flange (BL (S)), flange cover (BL).
2, according to the petrochemical industry standard score: threaded flange (PT), welded flange (WN), flat welding flange (SO), socket welding flange (SW), loose flange (LJ), flange cover (not table note).
3, according to the machinery industry standard score: integral flange, welded flange, plate flat welding flange, welding neck collar loose flange plate, flat plate welding ring loose flange, loose flange plate flange ring, flange cover.
4, according to the national standard of: integral flange, threaded flange, welded flange, with neck flat welding flange, with neck socket welding flange, welding neck collar Loose hubbed flange, welded flange plate , loose plate flange butt, flat plate welding ring loose flange, plate flange ring loose flange, flange cover.


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