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Improvement measures for large blind flange pressure operation of gas pipeline

The operation of the blind flange is essential for metallurgical enterprises in the process of equipment maintenance and emergency repair of gas systems and related processes, and the realization of efficient and safe operation of the blind flange is an important link to ensure the safe production of enterprises. By changing the original operation method, it can make the operators of blind flange save more physical strength, and the operation process is also smoother and safer, creating benefits for the enterprise. Introduction Blind flange extraction plugging operation, is in the process of equipment repair or maintenance, so that the maintenance […]

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Trial production of GH2747 superalloy seamless pipe

The vacuum induction and electroslag remelting process were used to successfully smelt GH2747 alloy tube blank. After hot piercing, two passes of cold rolling and solution heat treatment, the specification of “GH2747 alloy tube blank” was developed ϕ25 mm × 3 mm seamless pipe, and the nondestructive inspection, hydrostatic test, surface inspection, dimension inspection, chemical composition analysis, structure and performance inspection have been carried out. The results show that GH2747 superalloy seamless pipe has reliable process, good surface quality and dimensional accuracy; Its chemical composition meets the requirements of GB/T 14992-2005, and the content of each element is moderate; The […]

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Analysis of the causes of cracking and countermeasures of 304 stainless steel ……

During the inspection of a newly-built atmospheric and vacuum distillation unit (about six years idle), many cracks were found on 304 stainless steel (06Cr19Ni10) pipe fittings (flanges, elbows, tees). Two flanges with through cracks were dissected and sampled for inspection and analysis, and other pipe fittings were subjected to surface flaw detection, metallographic inspection and hardness test. Based on the comprehensive analysis of various inspection results, it is believed that the main reasons for the occurrence and propagation of cracks are that the solution heat treatment of pipe fittings does not meet the requirements, the metallographic structure has uneven austenite […]

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Design and optimization of steam tracing systems for chemical process pipelines

Chemical process pipeline in the actual transportation process will be affected by a variety of factors, need to actively take measures to ensure the safety and stability of chemical process pipeline transportation. In the actual production process, some workers do not pay attention to the design and research of the heat tracing system of chemical process pipeline, which leads to more problems. In this regard, the article briefly introduces the steam tracing system used in the chemical process pipeline, and composes the design points of the chemical process pipeline tracing system from the aspects of safety design, classification transportation and […]

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Relationship among pipe diameter, flow, velocity and pressure

Calculation formula of flow and velocity Flow = flow rate × Inner diameter of pipe × Inner diameter of pipe × π÷4; Therefore, the flow rate and velocity can be basically known to calculate the other parameters. Calculation of pipeline velocity But if the pipe diameter D and the pipe internal pressure P are known, can the flow be calculated? The answer is: the flow velocity and flow rate of the fluid in the pipe can not be calculated yet. You imagine that there is a valve at the end of the pipe. When it is closed, there is pressure […]

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Common Problems in Design and Manufacture of Expansion Joints

The expansion joint is a flexible component installed on the shell of the fixed tube sheet heat exchanger. It compensates the expansion deformation difference between the tube bundle and the shell by relying on the flexible structure that is easy to deform to eliminate the temperature difference stress between the shell and the tube bundle. Expansion joints are widely used in industrial sectors due to their reliable operation, good performance, compact structure and other advantages. From the shape of wave, there are U-shaped, Ω shaped and C-shaped expansion joints, among which U-shaped expansion joints are most widely used. Now I […]

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Why is heat treatment required for machining?

This is a very good question, which is a relatively confusing problem for many newcomers to the industry, but also many people with considerable experience in the industry did not think deeply about the problem, today here is a unified science. Mechanical processing heat treatment requirements is actually a technical requirement of the design process, if you are a mechanical structure design engineer, you need to have the cognitive ability in this regard, if you do not have such awareness, then you are not a qualified design engineer, at least not a very comprehensive design engineer. The cognition of heat […]

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Cause analysis of black belt defect of 316L forged flange

In the article, the problem of “black band” with strong magnetism and easy rusting on the surface of 316L forged flange was found by using macroscopic inspection, chemical analysis, metallographic analysis and scanning electron microscope analysis, etc. to find the cause of strong local magnetism and easy rusting of 316L forged flange. The black belt part and the parent material boundary is clear, and the metallographic organization of the black belt part is ferrite, Fe element is more than 90%, judged to be the involvement of foreign metal. Through the analysis of the actual production conditions, 316L forged flange “strip-like […]

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How to make high pressure pipe fittings

What are high-pressure pipe fittings? High-pressure pipe fittings are a type of plumbing fitting that joins multiple pipes together. Unlike standard plumbing fittings, high-pressure pipe fittings can withstand the pressure of compressed gases or liquids. To manufacture high-pressure pipe fittings, an alloy called stainless steel is used. Stainless steel is commonly used for these types of fittings because of its strength and durability, as well as its antimicrobial properties. To make high-pressure pipe fittings, a metal rod called stock is first heated in a furnace to ensure that it melts. Each fitting needs to be formed individually, so each metal rod […]

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Design principle of strength of gas transmission pipeline trunk line

The selection of wall thickness of large-diameter and high-pressure natural gas pipelines not only affects the safe operation of pipelines, but also is directly related to the investment in pipeline construction. The design concept, scope of application and technical advantages of each standard are analyzed by comparing the relevant contents of domestic and foreign standards for the strength design of straight sections of gas pipeline trunk lines such as GB 50251-2015, ASME B31.8-2007, ГОСТР 55989-2014, ISO 13623-2009 and CSAZ 662-11-2011, In particular, the differences in the design results of pipeline wall thickness between the standards are compared and analyzed with […]

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