Flange is a part that connects between shaft and shaft, used for connection between pipe ends; it is also used for flange on equipment inlet and outlet, used for connection between two equipment, such as reducer flange. In fact, flanges are divided into standard and non-standard. The so-called standard flange refers to the flange produced in strict accordance with the national or industry standards during the production of the flange, while the non-standard flange is based on the actual situation and the customer. Non-standard flanges customized for specific requirements. Among them, the standard flange is the flange type that can be bought on the market.

We all know that if flanges are classified according to standards, there are different types. For example, according to chemical industry (HG) industry standards, there are integral flanges (IF), threaded flanges (Th), and plate flat welding flanges (PL). , Butt welding flange with neck (WN), flat welding flange with neck (SO), socket welding flange (SW), butt welding ring loose flange (PJ/SE), flat welding ring loose flange (PJ/RJ), lining flange cover (BL (S)), flange cover (BL); according to the petrochemical (SH) industry standard, there are threaded flange (PT), butt welding flange (WN), flat Welding flange (SO), socket welding flange (SW), loose flange (LJ), flange cover; according to the mechanical industry standards, there are integral flanges, butt welding flanges, plate flat welding flanges, Butt weld ring plate loose flange, flat weld ring plate loose flange, flanged ring plate loose flange, flange cover; according to national (GB) standards, there are integral flanges, threaded flanges, butt welds Flange, flat welded flange with neck, socket welded flange with neck, butt welded ring loose flange with neck, plate flat welded flange, butt welded ring plate loose flange, flat welded ring plate loose sleeve method Flange, flange ring plate loose flange, flange cover.

So, what is the difference between these different standard flanges? Is it just a difference in classification? In fact, it is not. In addition to the difference in classification, there are other differences. Specifically, it is:

1. Different considerations:

Flanges used in the machinery industry only consider strength and linking. After all, flanges only need to be used for connection and not for sealing, so only the flanges of the machinery part are enough; while the flanges used in the chemical industry (HG) industry should not only be considered The strength and linking function are more to consider the airtightness, corrosion resistance and temperature influence. After all, the flange belongs to the pressure vessel flange, which needs to seal the medium (hot water or corrosive liquid, gas) in the pressure vessel of.

2. The flange appearance is different:

For flat welding flanges, their outer diameter and thickness are slightly different, but the center distance and bolt holes are the same, and they can be mixed.

Well, the above is the answer to "What is the difference between flanges of different standards", mainly in terms of classification, consideration when using flanges, and flange appearance. I hope everyone can understand and distinguish, and choose the right flange. use.