A stainless steel butt weld flange refers to a flange with a neck that is butt welded to the pipe. It is a kind of disc-shaped part used in pairs, and the most common type of flange in piping work that is mainly used for the connection of pipelines. When installing, the two flanges are sealed and then tightened with screws. The flanges with different pressures are of different thicknesses and used with different screws.
The heat resistant property of the stainless steel flange is indicated as follows.
- High impact resistance — The impact strength of stainless steel flanges is significantly improved compared with other kinds.
- The storage time of stainless steel flanges is relatively long. — They are UV resistant, radiation-proof, anti-fade, and can be stored for more than 50 years.
- stainless steel flanges have good corrosion resistance. — Apart from a small amount of hydrogenation agent, they can withstand a variety of chemical media corrosion. The flanges have a particularly good strong acid, alkali, corrosion resistance.
- Under normal working conditions, the inner wall temperature of the pipeline is 300 C, the ambient air temperature is 20 C, and the surface heat transfer coefficient of the flange is h=10W/(K).
The stainless steel flange joint should maintain on the same axis, and the center deviation of the screw hole should not exceed 5% of the hole diameter. The coupling screws of the stainless steel flange should be of the same specification, with the same installation direction, and the screws should be evenly distributed when tightening. A diagonal washer with unequal thickness cannot be used to remedy the unfairness of the stainless steel flange, neither can the double washers. When large-diameter gaskets are required to be spliced, they should not be flat welded but they can be slanted or processed by other methods. In order to facilitate the installation and uninstallation of stainless steel flanges and fastening screws, the shortest distance between the stainless steel flange and the wall surface should not be less than 200 mm. The screws should be tightened crosswise and in turn.
Some unscrupulous manufacturers will reduce the thickness and outer diameter of the flange to save materials. They also use offcut steel to process the flanges, which are sure to be with unqualified chemical composition and mechanical properties and cannot guarantee the performance or even be unable to connect to pipes properly. Poor steel materials will also cause leakage. Therefore, when buying flanges, it is better to pick stainless steel flanges from legitimate suppliers.
When you get the purchase order for stainless steel flange products, you will have a long time to tangle about how to buy stainless steel flange for good value. How to effectively control the cost of stainless steel flange is our duty, but also need to be constantly discussed and cracked. Starting from the following two aspects:
1. Search from the professional manufacturer of stainless steel flange. We need purchasers to do it by themselves, and we should fight for profits without losing anything. Specifically, the following points should be done well:
Strictly control the various indicators of stainless steel flange.
Check the chemical composition, mechanical properties and other requirements of stainless steel flange material, check the authenticity of the original material sheet. Check whether the thickness of stainless steel flange is within the standard wall thickness range.
2. Choose not less than 3 stainless steel flange manufacturers of different brands to make real comparison and analysis, and choose products of high quality and low price.
3. The price of stainless steel flange should be inquired about including tax and not including tax. The proportion of difference between the two should be calculated and the VAT invoice should be obtained.
4. Frequent on-site inspection, effective control of stainless steel flange production quality process, to ensure that 100% flange is not faulty, such as the occurrence of substandard products and timely communication with the French manufacturers, eliminate waste products.
5. According to the manual of stainless steel flange manufacturing, quality management controls the whole process of production, realizes product traceability and ensures quality.
Source: China Stainless Steel Flanges Manufacturer – Yaang Pipe Industry (www.steeljrv.com)
(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)
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