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Do stainless steel bolts must be used for stainless steel flanges?

There are often many owners who force the contractor to rectify on the ground that stainless steel flange using carbon steel or alloy steel bolts will cause corrosion, but it is difficult to explain the numerous grievances of the contractor. But is it really hard to explain? Actually, it’s easy to explain. 1. Article 5.8.7 of GB50316-2000(2008) code for design of industrial metal pipelines: under the condition of severe cycle, bolts or double-headed studs for flange connection shall be made of alloy steel. Note: Under the condition of severe cycle (refers to the occasion where the internal stress of pipeline […]

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Quick understanding of safety valve

Usually, the ordinary valve only plays the role of a switch, while the safety valve can also play the role of protecting equipment and preventing accidents in addition to the role of a switch, it is a very important safety attachment in special design. Today, yaang will take everyone to learn about safety valves. Classification and characteristics of safety valves Classified by overall structure and loading mechanism The safety valve can be divided into three types according to its overall structure and loading mechanism: hammer lever type, pulse type and spring type. The spring safety valve is commonly used. ①. […]

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How to calculate the thickness of blind flange

How to calculate the thickness of blind flange? In chemical enterprises, it is often encountered that production and maintenance are carried out at the same time. In order to ensure the effective isolation of production system and maintenance system, blind flanges are usually added between the flanges of associated pipelines. This involves the selection of blind flanges. For high pressure blind flanges, there are a series of products available for purchase, which will not be introduced here. For the medium and low pressure blind flange, each unit makes a round iron plate as blind flange by gas cutting, and the […]

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What is valve assembly

What is valve assembly? Valve assembly is the last stage in the manufacturing process. Valve assembly is the process of combining all parts and components of the valve together to make it a product according to the specified technical premise. The whole machine is the most basic unit of valve assembly, and several parts make up the parts of the valve (such as valve cover, valve clack parts, etc.). The assembly process of several parts forming parts is called component assembly, and the assembly process of several parts and components forming a valve is called general assembly. Assembly work has […]

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Comparison and determination of key performance indexes of pipes in the Heilon……

In the control project of the Sino-Russian Eastern Route Natural Gas Pipeline, the Heilongjiang crossing section crosses the borders of China and Russia. The LSAW steel pipes and induction heating bends used are supplied by Russia, However, the negotiations between China and Russia require that the key performance indicators of pipes implement the most stringent requirements of both China and Russia. In order to reasonably determine the pipe performance indexes of Heilongjiang crossing section and ensure pipeline safety, the pipe standards of China and Russia were compared and analyzed, and the key performance indexes of LSAW steel pipes and induction […]

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Corrosion resistance characteristics and application knowledge summary of comm……

With the rapid development of China’s economy, especially the acceleration of technological transformation and upgrading in the chemical industry, the application of special metal materials in China has become more and more extensive, especially in the petroleum, chemical and other related industries. The materials for production equipment have also been proposed more and more. Higher anti-corrosion requirements have led to the development and research of relevant Chinese research institutes and processing companies, and related equipment manufacturers’ ability to manufacture technology and equipment for special metal materials. The improvement (such as the application of explosive composite technology) during this period is […]

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Discussion on welding technology and quality control of pressure pipeline engi……

In the process of pressure pipeline installation, welding defects are easy to form due to various reasons. The common welding defects include incomplete fusion, undercut, slag inclusion, welding porosity, etc. Welding defects will not only seriously affect the quality of the pipeline, but also form the pipeline transportation liquid leakage, and then produce a series of safety risks, causing serious economic losses, thus increasing the investment cost of the pipeline, and then inhibiting the development of the enterprise. In view of the pressure pipeline welding needs comprehensive monitoring, to ensure the welding quality, to ensure the safety and stability of […]

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What is the performance grade of valve bolts?

The performance grade of bolts for valve steel structure connection can be divided into more than 10 grades, such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9 and 12.9. Among them, grade 8.8 of bolts and above are made of low-carbon alloy steel or medium carbon steel and heat-treated (quenching and tempering), which are generally called high-strength bolts, and the rest are commonly referred to as ordinary bolts. The bolt performance grade label consists of two parts, which respectively represent the nominal tensile strength and yield strength ratio of bolt material. For example: The meaning of bolts with performance grade 4.6 is […]

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Why do low temperature valves use long neck covers?

Suitable for medium temperature – 40 ℃ ~ – 196 ℃ valve is called low temperature valve, and this kind of valve generally adopts long neck valve cover. The long neck valve cover is adopted to specify low temperature valves, including low temperature emergency shut-off valve, low-temperature stop valve, low-temperature check valve, LNG special low-temperature valve, etc., which are mainly used in 300000 tons of ethylene, liquefied natural gas and other chemical plants. The output liquid low-temperature medium, such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc., is not only flammable and explosive, but also needs […]

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Corrosion Failure Analysis of Pipe Tee in a Natural Gas Field in West China

A pipe burst accident occurred in a straight-inserted pipe tee of a gathering and transportation pipeline in a western natural gas field. The main pipe of the pipe tee was made of 16Mn steel and the branch pipe was made of 316L+L416 bimetallic composite pipe. By observing the morphology of the failed tees, measuring the wall thickness of the failed pipe tees, using electrochemical methods to study the galvanic corrosion behavior of 16Mn steel and 316L stainless steel in the simulated gas field environment, using the FLUENT software to analyze the in-line, 45° and 30° respectively. Numerical simulation calculation is […]

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