The flange is a kind of pipe connection, which has the characteristics of stable connection, convenient disassembly, good sealing performance, etc., and is widely used in various industrial fields. For different working environments and fluid media, flanges require different pressure ratings to maintain their normal operation. Generally speaking, the pressure rating of the flange can be divided according to its working pressure and working temperature and other factors, generally divided into three grades: low, medium and high. HEBEI CANGRUN PIPELINE EQUIPMENT CO., LTD. specializes in processing carbon steel flanges of various pressure levels, stainless steel flanges, flat welding flanges, butt welding flanges, etc., and has passed the pressure pipe fitting special equipment manufacturing license certification. The quality is guaranteed. Our The purpose is to provide customers with excellent pipe fitting solutions.
1. Low pressure flange
The low-pressure flange is suitable for occasions where the working pressure is lower than PN1.6MPa and the temperature is lower than 120°C. Generally speaking, its inner diameter is 15-600mm, and low-pressure flanges generally use flat flanges. The sealing surface of the low-pressure flange is generally FF flat seal or RF raised surface seal, which is relatively simple in the installation and maintenance process, and the cost is relatively low. Therefore, in some places where the requirements for sealing and safety are not high, and economic conditions do not allow In the case of high-pressure flanges, it is more common to use low-pressure flanges.
2. Medium pressure flange
The medium pressure flange is suitable for the occasions where the working pressure is PN1.6～PN6.4MPa and the temperature is between -20℃～200℃. Generally speaking, the inner diameter of the medium pressure flange is 15-2000mm, and flat welding flanges and butt welding flanges are mainly used. For some pipelines, containers and equipment with large flows, medium pressure flanges are required at their connections to ensure their safe operation.
3. High pressure flange
High-pressure flanges are suitable for occasions where the working pressure is greater than PN6.4MPa and the temperature is between -20°C and 350°C. Generally speaking, the inner diameter of the high-pressure flange is 200-2000mm, and the tongue-and-groove flange connection and socket welding are mainly used. This connection method is more complicated, but it has better safety and reliability under the condition of bearing high pressure difference and strong corrosive medium.
To sum up, the pressure rating of the flange is divided according to its working pressure and working temperature and other factors, and is generally divided into three grades: low, medium and high. Flanges of different grades have their special application occasions and requirements in industrial applications, so they should be selected according to specific conditions when used. At the same time, in the manufacture and design of the flange, it is necessary to strictly follow the standard specifications to ensure that the connection is firm and the seal is reliable, so as to ensure the safety and reliability of the work.
Author: Maria
Post time: Aug-08-2023