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Petrochemical pipeline installation

Petrochemical pipeline installation is a complex specialty, which is characterized by large quantity of installation work, high quality requirements and long construction period. With the progress and development of technology in recent years, new construction methods are constantly adopted. At the same time, the state has issued new acceptance specifications, and the construction process content, processing methods, project quality acceptance standards of process pipelines have changed. Contents: 1. Preparation before construction 2. Pipeline construction process and method 2.1 Cleaning and inspection of pipes and fittings 2.2 Pipeline straightening 2.3 Pipeline cutting 2.4 Groove processing 2.5 Welding 2.6 Logo 2.7 Installation […]

2019-10-21 read more...
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How to choose a control valve?

The control valve is the terminal executive component in the industrial process control system. In the industrial process continuous production automatic control system, the control valve is generally used to control various process parameters in the process production, so as to achieve the adjustment of the parameters such as the pressure, temperature, flow and liquid level of the fluid. It is usually called “hand and foot” in the industrial process automation production. Its application quality is directly reflected in the regulation quality of the system. As a terminal executive component in process control, people have a deeper understanding of its […]

2019-10-19 read more...
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What is a fully welded ball valve?

What is a fully welded ball valve? Fully welded ball valve is widely used in various fields. Its superior quality and high-performance stability are beyond the reach of ordinary cast steel ball valve. Its service life is far longer than cast steel ball valve. Fully welded ball valve is widely used in urban gas, urban heating, petrochemical, shipbuilding, steel, regulating station, power plant and other kinds of pipeline equipment. Fully welded ball valve can be operated and used reliably for a long time. It needs maintenance and is easy to install. The installation of the valve is more convenient. Fully […]

2019-10-19 read more...
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Thread Type Guide

Screw thread and other standard parts products have a huge application market in aerospace, automobile, equipment manufacturing and other industries, whose quality directly affects the quality of the target products. At present, there are many thread styles and standards in the domestic market. Domestic and foreign ones, metric ones, English ones, straight ones, sealed ones, unsealed ones, internal and external ones, 55 ° ones and 60 ° ones are easy to be confused, which directly affects the product conformity rate in product development and trade export. The following small series are common symbols, standards of different countries and common threads […]

2019-10-18 read more...
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The whole process video of flange forging

Forged flange is one of the products with the best mechanical properties in flange products. Its raw material is generally round bar, and then it is cut and hammered continuously to eliminate segregation, looseness and other defects in ingot. The price and mechanical properties are one grade higher than that of common cast flange. Flange is the part that connects the pipe with the pipe and the valve, and is connected to the pipe end; it is also useful for the flange on the inlet and outlet of the equipment, and is used for the connection between the two equipment, […]

2019-10-18 read more...
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Nickel Alloy: Monel 400 (UNS N04400)

UNS N04400 or DIN W.Nr. 2.4360 / 2.4361, Monel 400 (also known as “Alloy 400”) is a solid-solution nickel-copper alloy with high strength and excellent resistance in a range of media, including seawater, hydrofluoric acid, sulfuric acid and alkalies. The Alloy 400 is also very resistant to stress-corrosion cracking and pitting corrosion in most fresh and industrial waters. Monel 400 is widely used in many fields such as marine engineering, chemical and hydrocarbon processing equipment, valves, pumps, shafts, flanges, fittings, fasteners, and heat exchangers. Contents: Chemical Analysis Typical Physical Properties Mechanical Properties Yield Strength – Temperature Chart Tensile Strength – […]

2019-10-16 read more...
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Electrochemical corrosion behavior of 2205 and 316L stainless steel in hydrofl……

The electrochemical behaviors of 2205 duplex stainless steel and 316L stainless steel in 5% (volume fraction) HF solution were investigated by potentiodynamic polarization and electrochemical impedance. The semiconductor characteristics of the passive films on the surfaces of the two kinds of stainless steel were analyzed by Mott schokkty curves. The results show that both kinds of stainless steel can be passivated in hydrofluoric acid solution, and the passivation range of 2205 duplex stainless steel is wider, and the passivation current density is lower. The surface passivation film of 2205 duplex stainless steel shows higher passivation film resistance and charge transfer […]

2019-10-16 read more...
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Study on Production Technology and Process Parameter Control of Double Layer C……

The structure and composition of double layer coiled welded pipe production line are introduced. The key processes of coiled pipe forming and brazing in production process are analyzed emphatically. The detection and control of key process parameters in production line are studied. Contents： Structural Composition of Continuous Pipe Production Line Manufacturing Process Analysis of Double-Layer Coiled Welded Pipe Detection and Control of Technological Parameters Summary 1. Structural Composition of Continuous Pipe Production Line The double-layer coiled pipe is made by forming machine, which coils the double-sided brazed strip steel 720 degrees along the direction of bandwidth, and then solders the […]

2019-10-13 read more...
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Gasket Selection Guidelines, Selection Faults and Countermeasures

1. Introduction As Figure1 shows, we previously reported that poor installation and poor selection account for a majority of sealant troubles at plants; troubles due to mis- selection account for approximately a quarter of all troubles. 1) To ensure that sealants function properly, appropriate selection is essential. This article introduces issues regarding gasket selection, selection methods, troubles due to selection errors, and countermeasures. Contents: Guidelines on gasket selection Issues regarding gasket selection Gasket-selection procedure Fluids which require care when selecting Thickness selection Troubles due to mis-selection and countermeasures against the troubles Thermal degradation in the joint sheet gasket Deformation of […]

2019-10-13 read more...
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How to select, repair and calibrate safety valves in coal chemical system

Coal is chemically processed into gas, liquid and solid fuels and other chemical products. During the production process, the pressure of the medium in the equipment or pipeline rises due to operational errors, mechanical failures, and abnormal chemical reactions. As a safety protection valve, the safety valve is normally closed in the coal chemical system. When the medium exceeds a certain pressure, it is automatically opened. By discharging the medium outside the system to prevent the pressure of the medium in the pipeline or equipment from exceeding the specified value. A safety valve plays an important protective role for personal safety and equipment operation, and […]

2019-10-13 read more...
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