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Structural regulations for ASME neck (shoulder) tube sheets

ASME regulations for necked (shoulder) tube sheet structures Send by comparing ASME VIII -1 and VIII -2; Mainly using ASME VIII -2 to detailed decompose the provisions of ASME VIII -1. Whether it is a heat exchanger designed according to national standards, ASME standards, or even European standards, the structure of shell and tube sheet butt welding is often encountered. The structure of ASME designed tube plate and shell docking connection is shown in UW-13.3; However, different understandings often arise here. Some designs, proofreading, and reviews, as well as some AI experts, believe that the neck chamfering of flange tube […]

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Anti-corrosion technology of oil and gas pipeline flange and bolt and its comp……

In the operation of oil and gas pipelines, flanges and bolts are often damaged by metal corrosion, which seriously affects their overall service safety. According to relevant theories and engineering application experience, six mainstream anti-corrosion systems and their basic construction methods at home and abroad are introduced and analyzed, and their advantages and problems exposed in engineering practice are systematically elaborated. The five main factors that should be considered when choosing the anticorrosion system for flanges and bolts of oil and gas pipelines are identified: environmental factors, cost, anticorrosion effect, service life, and post-maintenance. In the construction of oil and […]

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Research on manufacturing process of large marine shaft forgings

Through strict control of composition, the use of wide anvil forging molding technology, and a reasonable heat treatment process, the production of qualified large marine shaft forgings. Marine large forgings are the key components of the ship; with the ship, the large-scale, high-speed development and manufacturing technology continues to progress, the size of marine forgings is increasing, the quality of forgings is also more and more demanding, to the production of large marine forgings brought about by the difficulties are also more and more big. Manufacturing enterprises must have a high level of smelting control technology, field management and operation […]

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Coaxial machining of hydraulic cylinder barrel parts

The machining accuracy of cylinder parts directly affects the overall performance of the machinery, and coaxial is the most important matching shape and position accuracy of cylinder-type parts. This article provides several methods to ensure coaxiality accuracy. Hydraulic cylinder barrel parts are one of the most commonly used mechanical power conversion components, which are widely used in aviation, ships, automobiles, construction, and other machinery. Through the movement of the piston, they will be converted to hydraulic pressure, pneumatic pressure, etc., linear drive. In order to simplify the structure and increase the strength of precision equipment, the piston hole and piston […]

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Heat treatment of 50Mn steel rings

Bearings are indispensable basic parts of construction machinery, almost all of engineering machinery and equipment, such as transportation engineering, construction engineering, hydropower engineering, mining and other engineering loading and unloading machinery, excavator machinery, lifting machinery, compaction machinery and transportation machinery. According to engage in international construction machinery and agricultural machinery market research and analysis of the consulting organization British Engineering Machinery Consulting Ltd. predicts that in 2020, the sales of construction machinery and equipment will be more than 1 million units.   Because of the huge market demand, construction machinery ring forgings manufacturers must consider the ring forgings to ensure […]

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The Generation and Elimination of Residual Magnetism in Steel Pipe Welds

After years of on-site practice and observation, we have found that there have been multiple problems in pipeline construction where magnetic interference at the pipe mouth seriously affects welding operations and welding quality. In view of this, this paper summarizes a set of effective construction methods for demagnetization of steel pipe welds based on the author ‘s relevant work experience, and makes a brief discussion, hoping to be helpful to everyone. 1. Introduction The author once discovered at the construction site of a water supply pipeline in a certain power plant that the DN800 spiral pipe used in the project […]

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Processing and Inspection of Alloy 625 Nickel Base Alloy Tube Sheet

Introduced the processing tests of Alloy 625 material and the processing of UNS NO6625 tube plates, accumulating experience in manufacturing similar products. 1. Introduction Alloy 625 belongs to the Ni-Cr-Mo-Nb alloy and is a solid solution strengthened nickel based alloy, co mmonly known as Inconel Alloy 625. Due to its high content of Ni, Cr, Mo, and other elements and its unidirectional austenite structure, this alloy exhibits excellent corrosion resistance in both oxidizing and reducing media, making it co mmonly used in special environments with high temperatures and strong corrosion. In early 2006, a certain company selected SB564 UNS NO6625, […]

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Forming process study of GH4169 reducing tee

For the GH4169 reducing tee designed for special piping, the simulation study of the metal flow law of the hydraulic expansion process, the study of the loading path, the friction coefficient, the size of the billet, and other process factors on the quality of the forming process, the use of optimized process parameters, to solve the process of forming pipe fitting cracking and instability of wrinkles and other problems. The results show that reducing tee forming process wall thickness of the smallest area is the top of the branch, the bottom of the arc at the top, and the center […]

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Causes of hydraulic forged cylinder burst

The burst reason of a hydraulic forged cylinder was analyzed using macroscopic observation, chemical composition analysis, mechanical property test, and metallographic examination. The results show that the structure of the hydraulic forged cylinder is not uniform, and there are mixed crystals, resulting in strong brittleness of the material. An improper welding process leads to cracks near the welding arc starting point, which causes stress concentration. Under large stress, the rapid expansion of cracks leads to the burst of the cylinder barrel. A hydraulic forged cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating […]

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Manufacturing Process of 10Cr9Mo1VNbN Ring

10Cr9Mo1VNbN steel is a Martensite heat-resistant steel with good high-temperature oxidation and high-temperature creep resistance. The manufacturing process of 10Cr9Mo1VNbN ring forgings was introduced, and the performance testing results met the technical requirements, accumulating relevant experience for producing other heat-resistant steel materials with similar materials. 10Cr9Mo1VNbN is a martensite heat-resistant steel. By adding a large number of Cr, Co, Mo, V, Nb, and other alloy elements to the steel, the steel has a relatively high alloy content, good coefficient of thermal expansion and stress corrosion resistance, as well as good high-temperature oxidation resistance and high-temperature creep resistance. It is widely […]