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Selection of steel pipe wall thickness for high pressure and large diameter oi……

For oil and gas long-distance pipeline system, the reasonable selection of steel pipe, not only for the safe operation of the pipeline system is essential, but also can save the pipeline construction investment. Described the traditional principles of the relevant standards for the selection of steel pipe wall thickness and the selection of steel pipe wall thickness in high-grade areas. The feasibility of using a strength design factor of 0.8 to select the wall thickness of the pipeline in sparsely populated areas is analyzed; the practicality of reducing the wall thickness of gas transmission pipelines in high-grade areas and the […]

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Five common connection modes of pressure pipes

Pressure piping commonly used connection methods are welded connections, flange connections, threaded connections, hot fusion connections, groove connections, a variety of connection methods for different occasions, a reasonable choice of connection methods to ensure the quality of the connection is an important guarantee of safe operation of the pipeline, to avoid accidents caused by leakage. Welding connection Welded connection is the most widely used and reliable connection in metal pressure piping engineering, and therefore is also the most important connection method. Its main advantages are: the interface is solid and durable, not easy to leak, high strength and tightness of […]

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Different Types Of Pipe Fittings

A pipe fitting is used in pipe systems to connect straight sections of pipe or tube, adapt to different sizes or shapes, and for other purposes such as regulating (or measuring) fluid flow. these fittings are used in plumbing to manipulate the conveyance of water, gas, or liquid waste in domestic or commercial environments, within a system of pipes or tubes. Types of Pipe Fittings Buttweld Fittings A butt weld pipe fitting is made by the process of hot forming that includes bending and forming to shape. The starting material of butt weld fitting is a pipe that is cut […]

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Process study of flange forgings

This article outlines the drawbacks and problems of the traditional flange forging process, and conducts an in-depth study on the process control, forming method, process implementation, forging inspection and post-forging heat treatment of flange forgings in combination with specific cases. The article proposes an optimization plan for the flange forging process and evaluates the comprehensive benefits of this plan. The article has certain reference value. The drawbacks and problems of traditional flange forging process For most of the forging enterprises, the main focus in the process of flange forging is on the investment and improvement of forging equipment, while the […]

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Quality control of small forgings of nuclear reactor pressure vessel

The quality control of small forgings directly affects the overall quality and mainline progress of RPV. Therefore, taking the quality control of CRDM pipe olet of megawatt inverse nuclear reactor pressure vessel as an example, we discuss how to ensure the product quality of small forgings so as to improve the production efficiency. Introduction In pressurized water reactor nuclear power plants, the reactor pressure vessel (RPV) is the core of the main equipment of the nuclear island, it is the only non-replaceable equipment during the service period of the first circuit equipment, which plays a decisive role in the safe, […]

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Why does hydrogen embrittlement fracture occur in steel?

Let’s look at a few cases of accidents: At the beginning of World War II, a Spitpie fighter of the Royal Air Force crashed due to a broken engine spindle, destroying the plane, and the incident had shocked the British court. In 1975, an oil refinery in Chicago, the United States, a 15cm stainless steel pipe suddenly ruptured, causing an explosion and fire, resulting in a long-term shutdown. France in the exploitation of the Clark gas field, due to the rupture of the pipe, resulting in a fire that lasted a month. China in the development of a large oil […]

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Oxidation and decarburization of steel

In the process of heating iron and steel parts, there are generally three ways of heating, namely conduction, convection and radiation. The heating medium can be divided into air, controllable atmosphere or protective atmosphere, flowing particles, salt bath, vacuum, etc. according to whether it has an impact on the surface of parts. Among them, vacuum, controllable atmosphere or protective atmosphere basically have no impact on parts. When steel is heated in an unprotected atmosphere, oxidation reaction often occurs. Surface oxidation is accompanied by surface decarburization, so we usually say oxidative decarburization. In fact, oxidation and decarburization are two independent processes. […]

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Heat treatment of stainless steel

Classification and main characteristics of stainless steel Stainless steel has a variety of classification methods, such as chemical composition, functional characteristics, metallurgical organization and heat treatment characteristics. From heat treatment considerations, according to the metallurgical organization and heat treatment characteristics are more practical significance. Stainless steel → Ferritic stainless steel Austenitic stainless steel Martensitic stainless steel Ferritic-austenitic duplex stainless steel Precipitation hardening stainless steel Ferritic stainless steel The main alloying element is Cr, or add a small amount of stable ferrite elements, such as Al, Mo, etc., the organization is ferrite. Strength is not high, can not adjust the performance […]

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What is hot straightening

What is hot straightening? Hot straightening is an operation to correct the deformation by applying external force or changing the internal stress state of steel parts in various ways with the help of the characteristics of good plasticity of steel parts at a certain temperature. Due to the heating state with a certain temperature, it is easy to correct, so the thermal straightening method is widely used. Why does the workpiece need to be straightened? 1) After heat treatment, the workpiece is bent or warped due to thermal stress and structural stress, which is beyond the scope and must be […]

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Quality control of pipeline system installation

With the acceleration of industrialization, all sectors of society are showing vigorous vitality. In this historical environment, industrial pipelines have developed rapidly and the scope of application has gradually expanded. How to carry out effective installation quality control has become particularly important. This paper will focus on the key technologies and quality control measures of pipeline system installation, so as to further improve the quality of pipeline construction, accelerate the development of pipeline industry, and provide effective reference for relevant work in the future. Quality control of pipe installation 1. Must be familiar with the process of this position, the […]

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