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What is a seamless steel pipe for three chemicals

What is a seamless steel pipe for three chemicals? Seamless steel pipe used in petroleum, petrochemical and chemical industries(contain coal chemical industry) what say normally namely 3 change use seamless steel pipe, point to petroleum chemical industry commonly, include petroleum refining to change, chemical fiber production, coal chemical industry, chemical industry, chemical fertilizer production uses steel pipe aggregate. According to the production mode of steel pipe, it is divided into seamless steel pipe and welded pipe. Can be divided into carbon steel pipe, alloy steel pipe and stainless steel pipe by steel, and the compound steel pipe widely used in recent […]

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Application of nickel base alloy Inconel 690 in coal to methanol process pipel……

In the coal to methanol production unit, the pipeline from the heating furnace to the reformer is used to transport the mixture of gas and steam under high temperature and high pressure. The material for manufacturing this pipeline is required to have lasting strength, oxidation resistance and vulcanization resistance under high temperature and high pressure. The mixture of gas and steam is a flammable and explosive medium, which is very dangerous. It is required that the pipeline conveying this medium must be safe. The nickel base alloy inconel 690 is an ideal material for manufacturing this kind of nickel base […]

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What is a bellows seal globe valve

What is a bellows seal globe valve? Bellows globe valve is a new type of stop valve. The valve stem seal is a double seal design of bellows + packing. The sealing performance is more reliable than that of ordinary stop valve. The metal barrier formed by the bellows can prevent leakage, and the filler can also provide sealing effect after the bellows fails. The application is safer, energy-saving, environmental protection and zero leakage. The key part of the bellows seal stop valve is the metal bellows. Through the connection between the automatic roll welding cover and the valve stem, […]

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How to buy bellows seal valve

How to buy bellows seal valve? When the medium is toxic, volatile, radioactive or extremely expensive, it is not allowed to be leaked by the reciprocating valve stem, the bellows is often used to seal the valve cover. This special bonnet structure can protect the valve stem and valve packing from contacting with the process fluid. At the same time, the standard or environmental protection stuffing box structure is adopted on the bellows sealing element, which can avoid the disastrous consequences in case of bellows rupture and failure. Therefore, pay attention to observe whether the valve stem packing leaks. If […]

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The rejection rate is 100%, and the crack of ring forging is caused by forging……

During the processing of 18crmntih ring blank in a flange factory, it is found that there are cracks and scrap products with large crack defects and high scrap rate. The preliminary inspection of the crack defects shows that the crack is caused by the original crack of raw material bar. In view of this situation, the cracked parts were inspected, and the scrap situation was inspected at the processing site of the forging plant, so as to observe the macro defects and determine the causes of cracks. Macro morphology of defective parts Parts processing process: sawing cutting → induction heating […]

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Basic knowledge and preventive measures of valve corrosion

Corrosion is one of the important elements causing valve damage. Therefore, in the valve protection, valve anti-corrosion is an important issue to consider. What is the corrosion of valves? How to carry out valve anticorrosion? What is the basis for the selection of corrosion-resistant valves? Listen, how do you get here. Corrosion forms of valves The corrosion of metals is mainly caused by chemical corrosion and electrochemical corrosion, and the corrosion of non-metallic materials is generally caused by direct chemical and physical effects. Chemical corrosion Under the condition of no electric current, the surrounding medium directly acts with metal to […]

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Analysis of anti corrosion status and Countermeasures of special shaped parts ……

In the marine environment, bolts and other special-shaped parts are very common, which are the key basic parts in the mechanical industry. Due to the influence of salt and relative humidity in the marine environment, bolts and other special-shaped parts cause serious corrosion problems, security risks and huge economic losses. At present, there are many ways to solve the corrosion of special-shaped parts such as bolts. This paper briefly analyzes the basic measures and ideas of corrosion protection of special-shaped parts around the anti-corrosion solutions of special-shaped parts. Starting from the surface treatment technology, it discusses the anti-corrosion measures such […]

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How to improve the efficiency of plate heat exchanger

Optimization design direction of plate heat exchanger In recent years, the technology of plate heat exchanger is becoming more and more mature. It has high heat transfer efficiency, small volume, light weight, low dirt coefficient, easy disassembly, many kinds of plate, wide application range, and has been widely used in the heating industry. The plate heat exchanger can be divided into detachable, welded, brazed and shell type according to the assembly method. Because the removable plate heat exchanger is easy to be disassembled and cleaned, and the area of the heat exchanger is flexible, it is widely used in heating […]

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Seven structural forms of screw connection

Screw connection is used to connect two thin parts. There is a through hole on the connected part, and the parts are tightly connected through the screw connection of bolt and nut. For the convenience of practical operation, there is a certain gap between the screw and the hole. The structure is simple, and the loading and unloading is convenient. It is a common connection method in the automobile industry. According to the structural form, material differences, functional requirements and other screw joint structural forms are mainly divided into seven kinds. Common bolt + common nut In this structure, bolts, […]

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What is an orifice valve

What is an orifice valve? Orifice valve is a new type of flow metering and throttling device. Orifice valve is the most widely used flow meter in the world. Orifice valve is suitable for flow measurement of natural gas, oil, gas, water and other gases and liquids with or without sulfur. It is widely used in energy, petroleum, chemical and metallurgical industries. The research on standard throttling device is worldwide, and its depth is unmatched by other flow meters. It is because of the abundant data and statistical data accumulated in the experimental research that this kind of flowmeter does […]

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