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Do you know the difference between hot pressing elbow and stamping elbow?

Elbow is a kind of pipe fittings used at the turning of the pipe. Hot push, stamping, extrusion and other processes are commonly used in the forming process of seamless elbow. Do you know the difference between hot pressing elbow and stamping elbow? Forming technology of elbow Hot push forming technology of elbow The forming process of hot push elbow is a process in which special elbow pusher, core die and heating device are used to make the blank set on the die move forward under the push of the pusher, and is heated, expanded and bent during the movement. […]

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Machinability test of metal

Metal bending test Metal bending test is a test that the bending center of the specified size is used to bend the specimen to the specified degree, and to test the metal’s ability to withstand bending plastic deformation and show its defects. Metal bending tests can be performed at room temperature (cold bending test) or hot state (hot bending test). The size and shape of the specimen shall be determined according to the type of metal material according to the relevant standards. Bending test can be carried out on press, special testing machine, universal testing machine or round mouth vice […]

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Matters needing attention in engineering application of API 660-2015

Precautions for engineering application: 1.4.2 TEMA R is generally used if there is no special case. TEMA heat exchanger is divided into TEMA RCB, class R refers to petroleum and process industry applications, class C refers to commercial and general process applications, and class B refers to chemical industry applications. Generally speaking, R needs the minimum thickness and the thickest, which is the most expensive. 2.4.1 for single pass floating head heat exchanger and all fixed tubesheet heat exchangers, the purchaser shall indicate the data required to determine the expansion joint. These data can be filled in according to Appendix […]

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Update for TEMA 2019

Update for TEMA 2019 TEMA has updated the version 2019 (Tenth Edition) in 2019. It has been 12 years since the 2007 edition to 2019. Many friends are curious about what the changes are? This article will introduce the new update content of TEMA to you. Please point out the omissions. The main updates of the 2019 edition are as follows: New content: Numerical analysis of adding expansion joint (one dimensional FEA); Design rules of horizontal saddle; Dimension data of flange; Guide and configuration of shell side inlet distribution section; Research on the design of reducing scaling; Guide for expansion […]

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How to control the deformation of thin wall parts during carbonitriding and qu……

The inner ring of elastic bearing seat (hereinafter referred to as “inner ring”) is a part of an aircraft engine. In the working process, there is constant sliding, rolling and other relative motion process, and there is friction between the inner ring and other parts. At the same time, it also bears a certain alternating bending stress and contact fatigue stress, sometimes there is a certain impact force, and the working conditions are very bad. Corresponding to the service conditions, the common failure forms of the parts are excessive wear, surface spalling, fracture and so on. Therefore, the technical requirements […]

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How to design flange?

Brief introduction of flange Pipe flange, gasket and fastener are called flange joint. Flange joint is widely used in chemical engineering design, involving a wide range of parts. It is not only an essential part of piping design, pipe fitting and valve, but also an essential component of equipment, equipment parts such as manhole, sight glass, liquid level gauge, etc. In addition, flange joints are often used in other specialties, such as industrial furnace, thermal engineering, water supply and drainage, heating and ventilation, automatic control, etc. How to design flange? Standard system of pipe flange: There are mainly two systems […]

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Modern anticorrosion technology of fasteners

Metal is affected by the environment, and the destructive damage caused by chemical or electrochemical reaction is called corrosion. Almost all metal products will have some forms of corrosion in a certain environment. Screw is a metal product, so the problem of metal corrosion can’t be avoided. The corrosion phenomenon also has obvious differences when it is used in different environment and time. Taiwan, for example, has a narrow terrain, surrounded by the sea, and has an island climate. It has extremely high salinity and humidity in the atmosphere. There are also many polluting industries, such as steel, petrochemicals and […]

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How to prepare the technical specification for valve procurement?

It is a common phenomenon in the current market economy environment that only the specification, material, structure description, size and model meet the purchase requirements when ordering. However, this is wrong because a simple valve model covers only a few technical requirements, and the requirements covered in this part cannot be completely correct from the model It can easily cause the information asymmetry between the supply and demand of the valve, delay the normal installation and use time or cause major accidents after installation. Therefore, it is necessary to write out detailed and correct technical documents in the process of […]

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What is a steam trap

What is a steam trap? The steam trap is a kind of valve, also known as the drain valve. The drain valve is used to discharge the condensate, air and carbon dioxide gas in the steam system as soon as possible, and at the same time, it can automatically prevent the leakage of steam to the maximum extent. There are many kinds of traps with different performances. When choosing a steam trap, you should first choose its characteristics to meet the best operation of the steam heating equipment, and then consider other objective conditions. Only in this way can you […]

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Rising stem gate valve VS non rising stem gate valve

Gate valve is a kind of valve, whose movement direction is perpendicular to fluid direction. Gate valve can only be fully opened and closed, but can not be adjusted and throttled. The gate valve is sealed by the contact between the valve seat and the gate. Usually, the sealing surface is overlaid with metal materials to increase the wear resistance, such as 1Cr13, stl6, stainless steel, etc. There are rigid gate and elastic gate, according to the different stem, gate valve is divided into rising stem gate valve and non rising stem gate valve. What is rising stem gate valve? […]

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