Fange, also known as flange flange or flange. The flange is the part of the shaft and the shaft that is connected to each other for the connection between the ends of the pipe. It is also used for the flange on the inlet and outlet of the device for the connection between two devices, such as the flange of the reducer. The types of flanges are rich and varied. As a professional flange manufacturer, we will introduce the common flange types and their characteristics in 5 minutes.
 

1. Plate type flat welding flange

Advantages: Easy to take, simple to manufacture, low cost and widely used.

Disadvantages: Poor rigidity, so it should not be used in chemical process piping systems with high and extreme hazard requirements for supply, demand, flammability, explosive and high vacuum.

 

2, with neck flat welding flange with neck flat welding flange is a national standard flange standard system, is one of the national standard flange (also known as GB flange), is one of the commonly used flanges on equipment or pipelines . Advantages: It is convenient to install on site, and the process of welding seams can be omitted.

 Disadvantages: The neck with flat neck welding flange has a low neck height, which improves the rigidity and load carrying capacity of the flange. Compared with the butt welding flange, the welding work is large, the welding rod consumption is high, and the high temperature and high pressure and repeated bending and temperature fluctuation cannot be withstood.

 

3, with neck butt welding flange advantages: connection is not easy to deform, sealing effect is good, widely used, suitable for pipes with high temperature or pressure fluctuations or high temperature, high pressure and low temperature pipes, also used to transport expensive media, flammable Explosive medium, toxic gas on the pipeline. Disadvantages: The neck-to-welded flange is bulky, heavy, expensive, and difficult to install and position, making it easier to bump during transportation.

 

4, the overall flange The integral flange is a type of flange connection. It is also a type of neck welded steel pipe flange. Materials are carbon steel, stainless steel, alloy steel, etc. Among the various domestic standards, the IF is used to represent the overall flange. It is mostly used in pipes with higher pressure, and the production process is generally casting. In the flange type, an "IF" is used to indicate the type of the integral flange. Generally, it is a facet (RF). If it is used in flammable, explosive, high and extremely hazardous conditions, it can be used to seal the convex and concave surface (MFM) and the groove surface (TG) except the RF surface. The form of the face.

5. Socket weld flange The socket weld flange is a flange that is bolted at one end to the other end of the steel pipe. Applications: Boiler and pressure vessels, petroleum, chemical, shipbuilding, pharmaceutical, metallurgy, machinery, food and other industries. Commonly used in pipelines with PN≤10.0MPa and DN≤40.

6. Threaded flanges Threaded flanges are formed by machining the inner bore of the flange into a pipe thread and connecting it with a threaded pipe. It is a non-welded flange. Advantages: Compared with the welded flange or the butt weld flange, the threaded flange has the characteristics of convenient installation and maintenance, and can be used on some pipelines where welding is not allowed. Alloy steel flanges have sufficient strength, but are not easy to weld, or the welding performance is not good, and the threaded flange can also be selected. Disadvantages: It is recommended not to use threaded flanges to avoid leakage when the temperature of the pipe changes sharply or the temperature is higher than 260 °C and lower than -45 °C.

7, the welding ring loose flange

 The loose flange of the welding ring is a movable flange. It is usually matched with the water supply and drainage fittings. When the factory leaves the factory, there is a flange at each end of the expansion joint, which is directly connected with the pipeline and equipment in the project. Function: The purpose of loosening the flange of the butt ring is generally to save material. The structure is divided into two parts. One end of the pipe is connected to the pipe and the other is made into a butt weld ring. The flanges are made of low-grade materials, and the tubes are made of the same material as the pipes to save material.

 Advantages: Cost saving, when the pipe material is special and expensive, the flange of the same material is costly. It is inconvenient to weld or inconvenient to process or requires high strength, such as plastic pipes, glass pipes and the like. It is convenient for construction. For example, when the flange bolt hole is connected, it is not easy to find or prevent the flange bolt hole of the equipment to be changed in the future.

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

 

8, flat welding ring loose flange

The flat welding ring loose flange is a movable flange that is directly bolted to the pipes and equipment in the project. The purpose of using a flat welding ring to loosen the flange is generally to save data. The structure is divided into two parts. One part of the tube is connected to the pipe, one end is made into a flange, and the flange part is placed on the flange.

 Advantages: Convenient for welding or convenient for processing or high strength, such as plastic tubes, glass tubes and the like. It is convenient for construction. For example, when the flange bolt hole is connected, it is convenient to correct or prevent the flange bolt hole of the equipment to be changed in the future. When the price is high, the cost is saved. When the material of the pipe is special, the flange of the same material is costly.

 Disadvantages: Accepting low pressure. The strength of the weld ring is low (especially when the thickness is less than 3 mm).

9. Flange cover Also known as blind plate flange and blind plate, it is a flange without holes in the middle for sealing pipe plugs. The function is the same as that of the welded head and the threaded cap, except that the blind flange and the threaded cap can be removed at any time, but the welded joint is not.

10. Lining Flange Cover The lining flange cover is a blind flange that is welded to the side of the medium and is made of stainless steel. The lining flange cover is used as a blind plate on pipes with corrosive media. The difference from the ordinary flange cover is that the anti-corrosion lining is added to the interface with the medium.

How about, after reading this article, do you have a clear understanding of the various similarities of the flange? Our company as a professional flange manufacturer with many years of experience welcomes your consultation and purchase.