Recently Shipment to Mid Asia Projects

Leakage analysis and treatment of large flange in s-zorb reactor

The first s-zorb unit of a refinery was built and put into operation in 2009, with a designscale of 1.5 MT / A. the clean gasoline is produced by adsorption desulfurization technology, which has the characteristics of high desulfurization rate (sulfur content is reduced from 1000 μ g / g to less than 10 μ g / g) andsmall octane number loss. Since the firststart-up in November 2009, the reactor flange of the unit has been leaking, and it has been on fire for many times, which has become an important bottleneck affecting thesafe production and normal operation of the […]

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Principle, installation and maintenance knowledge of pneumatic control valve

What is pneumatic control valve? Pneumatic control valve is one of the industrial process control instruments widely used in petroleum, chemical, electric power, metallurgy and other industrial enterprises. In chemical production, regulating valve is essential in regulating system. It is an important part of industrial automation system, such as automation of production process. Now let’s have a comprehensive understanding of pneumatic control valve. Working principle Pneumatic control valve is to use compressed air as power source, cylinder as actuator, and with the aid of electric valve positioner, converter, solenoid valve, position maintaining valve and other accessories to drive the valve, realize […]

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Electrochemical noise detection of 316L stainless steel atmospheric corrosion:……

China has a vast marine area, which is one of the important areas for future resource development. The construction of islands and reefs is an important step of ocean development, in which a large number of metal materials, including stainless steel materials, are needed for infrastructure construction. In addition, stainless steel is also used as structural material for military equipment such as warships. However, the atmospheric corrosion of stainless steel is often an important factor restricting its application. Stainless steel materials are widely used as metal components in the atmospheric environment, but in the atmosphere with strong corrosiveness such as […]

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Effect of rare earth on copper and copper alloy

Copper and copper alloy are important industrial raw materials, which are widely used in electrical machinery, components, engineering, transportation and other fields. The development of high and new technology puts forward higher requirements for the properties of copper and copper base alloys. Rare earth is a metal element with active chemical properties, which can interact with many elements. The application of rare earth in nonferrous metals has attracted more and more attention of material workers. The results show that rare earth in copper and copper base alloy can Degas, change microstructure, improve machining performance, improve corrosion resistance and wear resistance. […]

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How to select a sealing gasket?

There are many kinds of gasket, different materials, different shapes of gasket have different functions. If the wrong gasket is selected, it will not only not seal well, but also become a potential safety hazard, which may occur at any time. Do you know what are the sealing gaskets and what are their characteristics? Contents: Industrial rubber gaskets Asbestos rubber gaskets Teflon gaskets Metal covered asbestos gaskets Metal Spiral wound gaskets How to order spiral wound gasket Octagonal gasket and elliptical gasket How to selection of gasket material How to choose the appropriate thickness of non-metallic gasket How to install […]

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Determination of setting pressure of safety valve and deviation of setting pre……

The set pressure refers to the preset pressure when the safety valve disc starts to open under the operating conditions, and it is the gauge pressure measured at the valve inlet. Under this pressure, under the specified operating conditions, the force generated by the medium pressure to open the valve is balanced with the force to keep the disc on the valve. Under this pressure, there is a measurable opening height, and the medium is in a continuous emission state that can be perceived by vision or hearing. Contents: Safety valve for steam boiler Safety valve for hot water boiler […]

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A complete set of pressure test methods for industrial valves

Generally, industrial valves are not subject to strength test in use, but after repair, the valve body and bonnet or the valve body and bonnet damaged by corrosion shall be subject to strength test. For safety valve, its constant pressure, reseating pressure and other tests shall conform to the specifications and relevant regulations. Before valve installation, valve strength test and valve sealing test shall be conducted on the valve hydraulic test bench. Spot check 20% of low-pressure valves, 100% of unqualified ones; 100% of medium and high-pressure valves. Contents: Pressure test method of stop valve and throttle valve Pressure test […]

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Cause Analysis of Corrosion of Ground Pipeline in High Flow Condensate Gas Field

A condensate gas field surface pipeline is used to transport underground natural gas to the gas gathering station, and the pipeline material is L245NB steel. After only 5 months of production, it was found by non-destructive testing that the partial wall thickness reduction of a section of the tee before entering the gas gathering station was extremely serious, mainly located at the corners, welds of the tee. After the gas from the condensate gas field flows out of the wellhead, it is separated into gas-liquid two phases with the decrease of pressure and temperature. The gas phase is natural gas […]

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Corrosion Resistance and Environmental Protection Chemical Passivation of Weld……

304L austenitic stainless steel has been widely used in many fields such as aerospace, transportation, petrochemical industry and marine buildings due to its excellent mechanical properties, corrosion resistance and welding properties. Usually, the surface of austenitic stainless steel will form a dense passivation film in atmospheric environment, which will isolate the matrix from the environment, thus ensuring that the matrix has excellent corrosion resistance [3,4]. However, in harsher atmospheric environment (such as ocean atmosphere), wind carries sea water containing chloride suspended particles to the steel surface, chloride emits Cl-, Cl-adsorbed on the surface of austenitic stainless steel through tidal interpretation, […]

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Corrosion Failure Analysis of Aluminum Alloy Flange of Current Transformer in ……

Substation current transformer (CT) is an important equipment of substation. It mainly undertakes the function of current conversion and electrical isolation, provides current for various instruments and relay protection, and isolates secondary system from high voltage to ensure the safety of person and equipment. Therefore, the normal operation of CT directly affects the safety and stability of substation transmission and transformation. On-the-spot investigation shows that the corrosion of CT pressure release film flange is serious in many substations in coastal areas, which directly affects the normal operation of CT and poses a serious threat to the safe and stable operation […]

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