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The difference between one piece, two piece and three piece ball valve

What is a one piece ball valve? One piece ball valve is composed of ball, PTFE ring and lock nut. One plug can fix the ball. It is small in size, reliable in sealing, simple in structure and convenient in maintenance. One piece is of reduced diameter, and the actual flow diameter is smaller than the thread diameter. Advantages of one piece ball valve 1. The fluid resistance is small, and its resistance coefficient is equal to that of the same length of pipe. 2. Simple structure, small volume and light weight. 3. It is compact and reliable. At present, […]

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Discussion on galvanic corrosion control measures for dissimilar metal flange ……

When the dissimilar metal flange connection of offshore oil and gas platform pipeline, the transmission of conductive and corrosive fluid will produce galvanic corrosion, which will lead to flange joint failure and leakage and other safety accidents. According to the standard of ISO 21457, the advantages and disadvantages of several control measures to reduce galvanic corrosion hazards and their applicability to offshore oil and gas platform topside pipelines are compared. Combined with the actual application of the project, two applicable measures, i.e., the insulation gasket assembly and the carbon steel flange sealing surface overlaying with corrosion-resistant alloy, are mainly discussed, […]

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Analysis on the failure and leakage of sealing gasket in petrochemical plant

What is sealing gasket? Sealing gasket is a kind of auxiliary material which is often used in mechanical device. It can increase the sealing property of the connection port of mechanical device and stabilize the connection port. It plays an important role in the mechanical installation. Taking the sealing gasket in petrochemical plant as an example, this paper focuses on the practical selection method and the causes of failure and leakage, so as to give full play to the auxiliary role of materials and reduce the loss in chemical production. Petrochemical plant is the basic part of comprehensive development and application […]

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Analysis of common surface defects of hot rolled steel sheet

Hot-rolled steel sheets and strip products are one of the important steel products. With the application and development of hot-rolled sheets in all aspects, users’ requirements for products are becoming more and more stringent. While users pay more attention to the quality of steel plates, they also pay more attention to the appearance quality of products. To a large extent, the appearance quality is one of the important indicators for evaluating the quality of hot-rolled steel sheets. If the appearance quality of the product does not meet the requirements, the user will not recognize and accept it. Therefore, in the […]

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Quenching and tempering treatment of 2Cr13 steel

What is 2Cr13 steel? 2Cr13 steel is a more commonly used stainless steel, which has high thermal strength, oxidation resistance and good shock absorption. It has good corrosion resistance in weakly corrosive media, and has sufficient corrosion resistance to fresh water, sea water, steam, and air. Higher performance can be obtained after heat treatment. It is commonly used to make mechanical parts that work below 450°C and chemical and food industry containers used at room temperature. For example, transmission parts, fixed pins, tie rods, turbine blades, valve seats, valve plates, valve stems, pump parts, molds, etc. Among them, transmission parts, fixed […]

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Cause analysis on cracking of SUS304 austenitic stainless steel flange

During the pressure test of a new process pipeline in a chemical plant, the leakage of an austenitic stainless steel flange on the pipeline led to the interruption of the pressure test. The main material of the pipeline is austenitic stainless steel SUS304. According to the site macroscopic inspection, the pipeline installation position is qualified, the support layout is reasonable, and the pipeline structure is normal, which meets the design and technical requirements. The design pressure of the pipeline is 1.6Mpa, and the test pressure is 2.4Mpa. When the pressure is slowly raised to 0.6MPa, a flange leaks and the […]

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Research on corrosion resistance of super austenitic stainless steels such as ……

Introduction to Super Austenitic Stainless Steel About Super Austenitic Stainless Steel The basic metallographic structure of super austenitic stainless steel is typical, 100% austenite. However, due to the high content of chromium and molybdenum, some metal mesophases are likely to appear. These metal mesophases often appear in the center of the plate. However, if the heat treatment is correct, the formation of these metal mesophases will be avoided, resulting in nearly 100% austenite. The metallographic structure of 254SMO does not have any other metal mesophase. The structure is obtained after heat treatment at a temperature of 1150 to 1200 degrees.  In the actual use process, if a small […]

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Cause analysis and preventive measures for EH oil pipeline fracture of steam t……

There are 6 coal-fired power units in a power plant, including 600MW 2 units and 300MW 4 units. The steam turbines are all produced by the same domestic steam turbine plant. The digital electro-hydraulic control system (DEH) and high-pressure fire resistant oil (EH oil) are used for hydraulic control. The main steam valve, control valve, bypass system and steam distribution mechanism of feed pump steam turbine are controlled at 14.5 About MPa, it has the advantages of fire prevention, sensitivity and high precision. EH oil system is unstable for many times in operation, which is mainly manifested in cracks or […]

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Study on low temperature tensile properties of thick wall X80 pipeline at diff……

Pipeline transportation is one of the most economical and safe ways for long-distance transportation of crude oil and natural gas. In order to improve transportation efficiency, reduce energy consumption and construction cost, the development of pipeline steel aims to achieve high strength and superior weldability. In recent years, with the increasing demand of global oil and gas resources, the research and construction of oil and gas pipelines in China has entered a new peak. Large diameter, thick wall and high-grade steel pipes have become one of the main options for pipeline construction [1-2]. X80 steel not only meets the requirements […]

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Measurement of bending angle of induction bending for oil and gas transportation

What is Induction Bending? Induction Bending is a controlled means of bending pipes through the application of local heating using high frequency induced electrical power. Originally used for the purpose of surface hardening steels, induction technology when used in pipe bending consists basically of an induction coil placed around the pipe to be bent. The induction coil heats a narrow, circumferential section of the pipe to a temperature of between 850 and 1100 degrees Celsius (dependant on the material to be formed). As the correct bending temperature range is reached, the pipe is moved slowly through the induction coil whilst […]

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