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Technical Articles

High-pressure Wellhead Device Valve Body End Threaded Flanges

  • Posted: 02/20/2024 01:02:49
  • Hits: 1

In the high-pressure oil and gas wellhead devices produced by some manufacturers in China, the end face of the valve body adopts a structural design with a threaded flange and an octagonal steel gasket seal. Since the connecting flange is not in contact with the medium, the valve body is easy to forge...


Threaded Flanges at the End of Valve Bodies of High-pressure Oil & Gas Wellhead Devices

  • Posted: 11/15/2023 01:11:00
  • Hits: 20

Abstract: The structure of the threaded flange at the end of the valve body of the high-pressure oil and gas wellhead device is introduced. The strength calculation method of this type of threaded flange and its common specifications and dimensions are given. The threaded flange is safe and reliable...


Why Do Stainless Steel Flanges Crack?

  • Posted: 10/19/2023 02:10:39
  • Hits: 30

Stainless steel flanges will crack during use, so what are the reasons for cracks in stainless steel flanges? Let’s analyze them together.   Physical and chemical analysis First, the chemical composition of the cracked flange was analyzed. The analysis results showed that the chemical composition...


Analysis of Leakages of Steam Flange Sealing

  • Posted: 06/15/2023 11:06:57
  • Hits: 109

Therefore, the leakage of sealing of the steam flange is the research object, and the concept of flange seal, the form of leakage and the analysis of the reasons for the leakage of steam flange seal are expounded. According to the analysis results, a solution to steam flange leakage is proposed combined...


Leakages of Steam Flange Sealing

  • Posted: 05/22/2023 07:05:34
  • Hits: 63

In the ironmaking process, steam is mainly used to replace the gas inside the blast furnace body, gravity dust collector and hot blast stove, so that maintenance personnel can inspect and repair the equipment. At the same time, steam is also used for heat preservation of some equipment in the ironmaking...


Results of Stainless Steel 304 Flanges in Propylene

  • Posted: 05/10/2023 07:05:37
  • Hits: 8

3. Results Stainless steel has good corrosion resistance, especially intergranular corrosion resistance, so it is an ideal material for chemical equipment such as acid-resistant containers, pipes and heat exchangers. The raw material of the failed flange is severely sensitized, and carbides are precipitated...


Analyzing Failure of Stainless Steel 304 Flanges in Propylene

  • Posted: 04/26/2023 03:04:18
  • Hits: 10

Summary In order to find out the cause of the leakage of stainless steel flanges in the pressure pipes of a polypropylene plant in a petrochemical plant, the cracked and failed stainless steel flanges were detected and analyzed.   The stainless steel flanges in the pressure pipeline of the polypropylene...


The Forging Process of Stainless Steel Flanges

  • Posted: 02/22/2023 12:02:40
  • Hits: 43

In the production of 38,000t product tankers, all connected pipes and reducing joints require high strength and corrosion resistance, and are all made from stainless steel (1Cr18Ni9Ti). Many connecting flanges must be forged and processed before use. Compared with ordinary carbon steel, stainless steel...


Analysis of the Cause and Recommendations for Welding

  • Posted: 01/16/2023 05:01:20
  • Hits: 5

1. The analysis of the failure According to the above analysis results, it can be known that the main reasons for the failure of the slip-on flange are as follows: (1) GB T 700-2006 standard stipulates that w(C) should be less than and equal to 0. 22% in Q235, and w (C) in this material is 0. 96%. In...