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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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Process Pipeline

Process Pipeline:pipeline connecting fittings, flanges, valves, gaskets, bolts and nuts to meet certain production processes. Flanges,gaskets, bolts Flanges Threaded flanges Socket-weld flanges Slip-on flanges Lap joint flanges Weld neck flanges Blind flanges Special flanges Gaskets Spiral wound gaskets Camprofile gaskets Metal jacketed gaskets Bolts Double-headed bolt Single head bolt Nut Flange Flange is a part that connects the pipe to the tube and connects to the end of the pipe. Flange connection or flange joint refers to the removable connection of flange, gasket and bolt as a group of combined sealing structures. Pipeline flange refers to the flange used in piping equipment, and in equipment it refers to the import and export flange of equipment. There are holes […]

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Sealing and Leakage of Flange

Flange connection is one of the most common and important connection forms of pipeline, pipe fittings, valves, instruments and equipment in petrochemical plants. Connecting flange mainly relies on the pressure produced by its connecting bolt, through the flange gasket to achieve enough specific pressure of working seal to prevent the leakage of medium inside the pipeline and achieve sealing. Although this connection has the characteristics of easy disassembly and no fire, due to its own structural characteristics, improper treatment will lead to leakage, not only waste of resources, but also pollute the environment, and even cause casualties and property losses. […]

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Working Principle and Application Classification of Industrial Boiler

Boiler is a kind of energy conversion equipment. The energy input to the boiler includes chemical energy and electric energy in fuel. The boiler outputs steam, high temperature water or organic heat carrier with certain heat energy. Boilers can be divided into power plant boilers, industrial boilers, vehicle and marine boilers, domestic boilers and so on. Industrial boilers are boilers that provide steam or hot water (hot water boilers) for industrial and mining enterprises to meet the needs of production process, power and heating. Working principle The main working principle of the boiler is a kind of thermal equipment which […]

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