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How to carry out quality control when installing process pipeline in chemical ……

If the chemical plant is compared to a person, the equipment must be the “heart part”; the process pipeline for transporting raw materials, water, gas, finished products, etc. is the “artery”, which plays an important role in the production process. Therefore, at the beginning of project construction, it is necessary to strictly control the quality of process pipeline installation. If the quality is not good, it will greatly affect the normal production in the future. As a chemical construction unit, controlling the quality of process pipeline installation is the key to the survival of the installation enterprise, and also the […]

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Installation and inspection of high strength bolts

I. Preface The high-strength bolts for steel structure produced by domestic high strength bolts manufacturers mainly include A325 and A490 of American ASTM specification, f10t and s10t of Japanese JIS specification. Domestic high strength bolts manufacturers will produce bolts of Japanese and American specifications at the same time, because of the design specifications used in China, mainly referring to American AISC specifications; while the manufacturing and construction of steel structure factories mostly follow Japanese standards. Therefore, most of the steel structures of buildings use the torque control high-strength bolts of Japanese specifications, but the bolts used in bridge engineering are […]

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Application and Development of Duplex Stainless Steel

Duplex stainless steel consists of ferrite phase and austenite phase in its quenched structure, and the content of the minimum phase may reach 30%. Duplex stainless steel is formed on the basis of 18-8 austenitic stainless steel by increasing the content of Cr or adding other ferrite elements, which makes the steel have two-way structure of austenite and ferrite, and saves Ni alloy. Duplex stainless steel has the advantages of both ferritic stainless steel and austenitic stainless steel by correctly controlling chemical composition and heat treatment process due to the characteristics of two-phase structure of bidirectional stainless steel. Duplex stainless […]

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Tool Wear, Surface Topography, and Multi-Objective Optimization of Cutting Par……

The application of AISI 304 austenitic stainless steel in various industrial fields has been greatly increased, but poor machinability classifies AISI 304 as a difficult-to-cut material. This study investigated the tool wear, surface topography, and optimization of cutting parameters during the machining of an AISI 304 flange component. The machining features of the AISI 304 flange included both cylindrical and end-face surfaces. Experimental results indicated that an increased cutting speed or feed aggravated tool wear and affected the machined surface roughness and surface defects simultaneously. The generation and distribution of surface defects was random. Tearing surface was the major defect […]

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Corrosion Behavior of Nickel-based Alloy 718 in H2S/CO2 Environment

With the development of oil and gas exploration, more and more acidic oil and gas fields have emerged. Such oil and gas fields generally contain CO2, H2S and Cl-and other corrosive media, which are easy to cause severe corrosion of oil casing and seriously threaten the safe production of oil and gas fields. The effective anticorrosive measures commonly used in the world are the use of anticorrosive materials [1]. Among them, nickel-based anticorrosive alloys have become the focus of material selection because of their excellent comprehensive anticorrosive properties. Foreign research and application practice also show that the use of nickel-based […]

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Corrosion Prevention Measures for Metal Valves

1 Overview Corrosion is one of the main causes of damage to metal valves. The corrosion of metal valves is mainly electrochemical corrosion. In the use of valves, the first consideration of corrosion protection is to eliminate electrochemical corrosion. When electrochemical corrosion can not be eliminated, passivation film should be formed on the metal surface, or non-metallic materials should be used instead of metal materials to control the occurrence of corrosion. 2 Elimination of electrochemical corrosion 2.1 Material Selection Many mediums are corrosive, and their corrosion principle is very complex. Even if the same valve material is used in the […]

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Effect of solid solution treatment on the quality of the stainless steel pipe ……

The production cost of stainless steel pipe fittings should be considered, but the factors of preventing corrosion and improving product quality should also be taken into account. Therefore, it is necessary to adopt solid solution process in the production process of stainless steel pipe fittings to enhance the safety of pipe fittings. Heat treatment process plays a vital role in the quality and safety of pipe fittings. It is known that in order to save cost in the production of pipe fittings, a few enterprises did not take solid solution treatment, only used polishing and sandblasting methods to deal with […]

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Causes and elimination methods of pipeline vibration

Common pipeline vibration Oil pipeline vibration Water pipeline vibration Steam pipeline vibration Extraction pipeline vibration Live steam pipeline vibration The heating pipeline is vibrating Harm of pipeline vibration In the rotating equipment and flowing medium of the unit, low-intensity mechanical vibration is unavoidable. The mechanical vibration of the rotating equipment is transmitted to the system piping through the system connecting parts and medium, which poses a great threat to the safe operation of the unit. The hazards of pipeline vibration mainly include the following: Hazard to the staff: Interfere with the vision of the staff, reduce the construction efficiency; the […]

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Types of Ball Valves

Ball valves are quarter-turn valves used in residential, commercial, and institutional applications to control the on-off flow of liquids and gases. They are available in a range of sizes, materials, and connection types. The major components of a ball valve are: The Valve Body – A pressure vessel that contains the components needed to control or shut off the flow through a pipe. It is designed to connect two or more sections of pipe or tubing to each other. The Ball – A sphere with a flow path (hole or tunnel) through the center of it and a connection point for a […]

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How to select the right electric actuators for forged steel valve

Electric actuator of forged steel valve is an indispensable driving device for forged steel valve program control, automatic control and remote control. The movement process can be controlled by the stroke, torque or axial thrust. The working characteristics and utilization of the forged steel valve electric device depend on the type of forged steel valve, the operating specifications of the device and the position of the forged steel valve on the pipeline or equipment. 1. Forged steel valve electric actuators generally consist of the following parts: Specific motor, characterized by strong overload capability, large starting torque, small rotational inertia, short working […]

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