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What Are the Main Kind of Flanges?

Jun. 09, 2020

We generally think about two main households of flanges, the conventional flanges, and the unique ones.


" A flange is a created or cast ring of steel created to attach mechanically areas of pipe or join pipeline to a pressure vessel, pump, shutoff, or any other tool."

Normally flanges are bonded or threaded as well as 2 flanges are signed up with to every various other by bolting together them with gaskets to supply a seal. It supplies very easy access to the piping system in case of cleaning, adjustment, and also assessments.

You can read about the basics of steel flange in our article. Processing Method of Stainless Steel Flange.


The basic types of flanges are:

- Slip-on

- Blind

- Lap-Joint

- Outlet Weld

- Threaded

- Weld-Neck

- Orifice


The flange is slipped over the pipe and also is worked out by welding at both top and base sides of the flange. They are utilized to provide enough toughness to the connection as well as stop leakage. This flange is preferred over weld neck flanges as much less precision is required when cutting pipe to size, the expense to create is reduced but there is nearly the very same result.

Blind Flanges


This is a flange without a birthed. Likewise called a blanking flange, it is used to fix or secure an end of a piping structure or turned off a piping system or vessel opening. Evaluation of vessels or piping systems is much easier and also it is easier to access it. A blind flange can be provided with or without center depending on the demands.


This is once again comparable to a slip-on flange, yet it has a radius at the crossway of the birthed and also the flange face to suit a lap stub end. The face on the stub end creates the gasket face on the flange. This sort of flange is made use of in applications where a section of piping systems require to be taken down quickly and also conveniently for evaluation or substitute.

Socket Weld Flanges


This is similar to a slip-on flange in a rundown, however, the birthed is counter-bored to approve the pipeline. The size of the continuing to be birthed is the same as the inside diameter of the pipeline. The flange is affixed to the pipe by a fillet weld around the hub of the flange. An optional period weld might be applied in high-stress applications. It's the greatest usage remains in high-pressure systems such as hydraulic as well as steam lines.


This is similar to a slip-on flange in a rundown, yet the birthed is threaded, hence allowing assembly without welding. This obviously limits its application to relatively low-stress piping systems. The flange may be bonded around the joint after assembly, however, this is ruled out a satisfying approach of raising its applications.


As ist name, this is a flange connected by welding neck of the flange to a pipe. It is expensive due to its lengthy neck, but more suitable for high-stress applications since the neck offers crucial reinforcement to the flange. The birthed of the flange matches the birthed of the pipe, lowering turbulence and also disintegration.



The unique sorts of flanges are:

- Groove Flanges/ Tongue Flanges

- Lengthy Neck

- Orifice

- Spectacle


A groove flange is constantly paired with a tongue flange.

The tongue flange has the face with a raised ring (i.e. the tongue). One flange has actually a machined elevated ring (likewise called the tongue) as well as the other one has actually machined groove depression (additionally called the groove). Those two flanges should match perfectly with each other.

Tongue-and-groove strugglings with are standard in both huge and also little types. They are generally used for pump covers and shutoff bonnets.

Tongue-and-groove joints have the advantage of being self-aligning and act as a tank for the adhesive. Major machining operations are not essential especially thanks to the headscarf joint keeping the axis of filling in line.

Long Weldneck Flange


Owing to our rich commercial experience, we are providing a comprehensive series of Long Weld Neck Flanges. T These flanges are one-of-a-kind because of their basic connectivity with other pipes. Moreover, our items are extensively utilized in refining sectors for connecting functions. Our respected customers can avail of these qualitative series of flanges from us at industry-leading costs.


The feature of an orifice flange is to offer access to a line for metering of gases or fluids. An orifice plate is clamped between a set of flanges when mounted in a line and the whole assembly is refer to as an orifice flange union. Jack-screws within the setting up-promote the removal of the orifice plate. The orifice plate, the metering tool, contains a slim plate with a concentric, square side, circular opening in the center. 2 pressure tap-holes are drilled in each flange to gauge pressure distinction via the orifice.


This is a stress keeping plate with one strong end as well as one open end connected with the internet or tie-bar. In typical operation, the open end creates the seal in between 2 flanges and allows the typical circulation of fluid through the pipework. If the solid end is turned into the position it properly blanks of the pipeline and halts the circulation.


The ASME B16.5 and also B16.47 define different kinds of flange confronting as complies with:

- Increased Face

- Apartment Face


The Elevated Face (RF) type is one of the most employed flange faces, as well as is very easy to identify. It is referred to as an increased face since the gasket surface areas are raised above the bolting circle face.

  Flat  Flanges


The Apartment Face (FF) flange has a gasket surface in the same aircraft as the bolting circle face. Applications making use of level face flanges are often those in which the mating flange or flanged fitting is made from a casting.

Flat face flanges are never ever to be bolted to an elevated face flange. ASME B31.1 states that when attaching flat face cast iron flanges to carbon steel flanges, the elevated face on the carbon steel flange should be gotten rid of and that a complete face gasket is required. This is to maintain the thin, brittle cast iron flange from being sprung right into the gap caused by the increased face of the carbon steel flange.

General flange encounters such as the Ring-Type Joint (RTJ), Male-and-Female (M&F) and Tongue-and-Groove (T&G) can not be bolted together since the get in touch with surface areas do not match and there is no gasket that has one kind on one side and an additional type on the other side.