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The essence of flange basic knowledge-graphic analysis of flange types

  • Categories:News Center
  • Time of issue:2021-01-18 15:12
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(Summary description)Flange connection is to fix two pipes, pipe fittings or equipment on a flange plate respectively, then add a flange gasket between the two flange plates, and finally tighten the two flange plates with bolts. It is a detachable joint that is tightly integrated.

The essence of flange basic knowledge-graphic analysis of flange types

(Summary description)Flange connection is to fix two pipes, pipe fittings or equipment on a flange plate respectively, then add a flange gasket between the two flange plates, and finally tighten the two flange plates with bolts. It is a detachable joint that is tightly integrated.

  • Categories:News Center
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  • Origin:https://kknews.cc/news/yyxqmqn.html
  • Time of issue:2021-01-18 15:12
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Information

Flange connection is to fix two pipes, pipe fittings or equipment on a flange plate respectively, then add a flange gasket between the two flange plates, and finally tighten the two flange plates with bolts. It is a detachable joint that is tightly integrated.

Application: Flange joint is a kind of component that is widely used in engineering design and involves a very wide range. It is an indispensable part for piping design, pipe fittings and valves, and also an essential component in equipment and equipment parts (such as manholes, sight glass level gauges, etc.). In addition, other professions such as industrial furnace, thermal engineering, water supply and drainage, heating and ventilation, automatic control, etc., also often use flange joints. 
Classification: flat welding flange, neck flange, butt welding flange, ring connection flange, socket flange, and blind plate, etc.

Executive standard: GB series (national standard), JB series (mechanical department), HG series (Ministry of Chemical Industry), ASME B16.5 (American Standard), BS4504 (British Standard), DIN (German Standard), JIS (Japanese Standard) ).

International pipe flange standard system: There are two main international pipe flange standards, namely the European pipe flange system represented by German DIN (including the former Soviet Union) and the American pipe flange represented by American ANSI pipe flange system.

In addition, there are Japanese JIS pipe flanges, but they are generally only used in public works in petrochemical plants, and they have little international impact.

Flange type and sealing surface form
Flat welding flange

Flat welding flanges are suitable for the connection of steel pipes with a nominal pressure not exceeding 2.5MPa. The sealing surfaces of flat welding flanges can be made into three types: smooth, concave and convex and tongue and groove types. Smooth flat welding flanges are the most widely used. Multi-purpose In the case of relatively mild media conditions, such as low-pressure unpurified compressed air, low-pressure circulating water.

 
Plate flat welding flange


Plate flat welding flange (chemical standard HG20592, national standard GB/T9119, mechanical JB/T81).

Advantages: easy to obtain materials, simple to manufacture, low cost, and widely used

Disadvantages: The rigidity is poor, so it should not be used in the chemical process piping system and high and extremely hazardous occasions with supply and demand, flammable, explosive and high vacuum requirements.

The sealing surface types are flat and raised.

Flat welding flange with neck


The neck flat welding flange belongs to the national standard flange standard system. It is one of the manifestations of the national standard flange (also known as GB flange), and one of the commonly used flanges on equipment or pipelines. 
Advantages: site installation is more convenient, can omit the welding process

Disadvantages: The neck height of the flat-welded flange with neck is lower, which improves the rigidity and load-carrying capacity of the flange. Compared with the butt welding flange, the welding workload is large, the welding rod consumption is high, and it cannot withstand high temperature and pressure, repeated bending and temperature fluctuations.

Butt welding flange
Butt welding flanges are not easy to deform, have good sealing, and are widely used. They have corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition. The distance between the welding port and the joint surface is large, and the joint surface is protected from welding temperature deformation. The horn-shaped body structure is suitable for pipelines with large fluctuations in pressure or temperature or high temperature, high pressure and low temperature pipelines. It is generally used for the connection of pipelines and valves with a PN greater than 2.5MPa; it is also used for transporting expensive, flammable and explosive On the pipeline of the medium.


Butt welding flange with neck

 
The sealing surface forms of necked butt welding flanges are: raised surface (RF), concave surface (FM), convex surface (M), tenon surface (T), groove surface (G), full plane (FF).

Advantages: The connection is not easy to deform, the sealing effect is good, and it is widely used. It is suitable for pipelines with large fluctuations in temperature or pressure or high temperature, high pressure and low temperature pipelines. It is also used to transport expensive media, flammable and explosive media, and toxic gases. on

Disadvantages: The neck butt welding flange is bulky, heavy, expensive, and difficult to install and locate. Therefore, it is easier to bump during transportation.

Integral flange
The integral flange is a type of flange connection. It is also a kind of butt-welded steel pipe flange with neck. The materials are carbon steel, stainless steel, alloy steel, etc. In various domestic standards, IF is used to represent the integral flange.


Generally raised surface (RF), if in flammable, explosive, highly and extremely hazardous working conditions, you can choose convex and concave surfaces (MFM) and tongue and groove surface (TG) seals other than RF surface The form of noodles.

Socket welding flange
Socket welding flange is a flange whose one end is welded to a steel pipe and the other end is bolted.


Sealing surface form: raised surface (RF), concave-convex surface (MFM), tongue and groove surface (TG), ring connection surface (RJ)

Application scope: boiler pressure vessel, petroleum, chemical, shipbuilding, pharmaceutical, metallurgy, machinery, stamping elbow food and other industries. Commonly used in pipelines with PN≤10.0MPa and DN≤40.

Threaded flange

Threaded flange is a kind of non-welded flange by processing the inner hole of the flange into pipe thread and matching with threaded pipe to realize connection.

Threaded flange is a kind of non-welded flange by processing the inner hole of the flange into pipe thread and matching with threaded pipe to realize connection. Compared with the flat welding flange or the butt welding flange, the threaded flange has the characteristics of convenient installation and maintenance, and can be used on some pipelines that are not allowed to be welded on site. The alloy steel flange has enough strength, but it is not easy to weld, or the welding performance is not good, you can also choose the threaded flange. However, when the temperature of the pipeline changes sharply or the temperature is higher than 260℃ and lower than -45℃, it is recommended not to use threaded flanges to avoid leakage.

Advantages: Compared with flat welding flanges or butt welding flanges, threaded flanges have the characteristics of convenient installation and maintenance, and can be used on some pipelines where welding is not allowed on site. The alloy steel flange has enough strength, but it is not easy to weld, or the welding performance is not good, you can also choose the threaded flange.

Disadvantages: When the temperature of the pipeline changes sharply or the temperature is higher than 260℃ and lower than -45℃, it is recommended not to use threaded flanges to avoid leakage.

Butt welding ring loose flange

Butt weld ring loose flange is a movable flange piece, which is generally matched with water supply and drainage accessories. When the factory leaves the factory, there is a flange at each end of the expansion joint, which is directly connected to the pipeline and equipment in the project with bolts.

Function: The purpose of using butt weld ring loose flange is generally to save material. Its structure is divided into two parts. One end of the pipe is connected to the pipe, and the other end is made into a butt weld ring. The flange is made of low-grade materials, and the pipe part uses the same material as the pipe to save material.

Advantages: cost saving and easy construction.

Disadvantages: low pressure. Low strength at the weld ring (especially when the thickness is less than 3mm)

Flat welding ring loose flange
The flat welding ring loose flange is a movable flange piece, which is generally matched with the water supply and drainage fittings (the most common on the expansion joint). When the factory leaves the factory, there is a flange at each end of the expansion joint, which is directly connected to the engineering Pipes and equipment are connected by bolts. The purpose of using flat welding ring loose flanges is generally to save materials. Its structure is divided into two parts. One end of the pipe is connected to the pipe, the other is made of flanging, and the flange part is sleeved on the flanging. The flange is made of low-grade materials, and the pipe part uses the same material as the pipe to save material.


Flange cover
Flange cover is also called blind flange or blind plate. It is a flange without a hole in the middle, which is used to seal the pipe plug. The function is the same as the welding head and the threaded tube cap, except that the blind flange and the threaded tube cap can be removed at any time, while the welding head is not.


Flange cover sealing surface: flat surface (FF), raised surface (RF), concave and convex surface (MFM), tongue and groove surface (TG), ring connection surface (RJ)

Lining flange cover
The lining flange cover is a kind of blind flange, and the side close to the medium is welded with stainless steel as a whole. Lining flange covers are used as blind plates on pipelines with corrosive media. The difference with ordinary flange cover is that the contact surface with the medium is added with anti-corrosion lining.


American standard flat welding flange with neck
A flat welding flange with neck is connected to the pipe end. It is mainly a part that connects the pipe to the pipe. There are holes on the flat-welded flange with neck, bolts can be used to make the two flanges tightly connected, and the flanges are sealed with gaskets.

The connection of flat-welded flange with neck is composed of a pair of flanges, a gasket and several bolts and nuts.

The gasket is placed between the sealing surfaces of the two flanges. After tightening the nut, the specific pressure on the gasket surface reaches a certain value and deforms and fills up the unevenness of the sealing surface to make the connection tight and leak-proof. Flange connection is a detachable connection. According to the connected parts, it can be divided into container flange and pipe flange. The flat welding flange with neck is suitable for the connection of steel pipes whose nominal pressure does not exceed 2.5MPa.

The flat-neck welding flange is used for butt welding of flange and pipe. It has a reasonable structure, high strength and rigidity, can withstand high temperature and pressure, repeated bending and temperature fluctuations, and has reliable sealing. The flat-welded flange with neck with a nominal pressure of 0.25~2.5MPa adopts concave and convex sealing surface.


American standard butt welding flange
The American standard flange is a part that connects the pipe to the pipe and is connected to the pipe end. American standard butt welding flanges are made by forging and casting.

American standard butt welding flanges can be divided into necked American standard butt welded flanges and non-necked American standard butt welded flanges according to their neck conditions.

The American standard butt welding flange consists of two flange plates plus flange gaskets, which are fastened together with bolts to complete the connection. There are holes on the American standard flanges, and bolts make the two flanges tightly connected.

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