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Cause Analysis of Corrosion of Ground Pipeline in High Flow Condensate Gas Field

A condensate gas field surface pipeline is used to transport underground natural gas to the gas gathering station, and the pipeline material is L245NB steel. After only 5 months of production, it was found by non-destructive testing that the partial wall thickness reduction of a section of the tee before entering the gas gathering station was extremely serious, mainly located at the corners, welds of the tee. After the gas from the condensate gas field flows out of the wellhead, it is separated into gas-liquid two phases with the decrease of pressure and temperature. The gas phase is natural gas […]

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Corrosion Resistance and Environmental Protection Chemical Passivation of Weld……

304L austenitic stainless steel has been widely used in many fields such as aerospace, transportation, petrochemical industry and marine buildings due to its excellent mechanical properties, corrosion resistance and welding properties. Usually, the surface of austenitic stainless steel will form a dense passivation film in atmospheric environment, which will isolate the matrix from the environment, thus ensuring that the matrix has excellent corrosion resistance [3,4]. However, in harsher atmospheric environment (such as ocean atmosphere), wind carries sea water containing chloride suspended particles to the steel surface, chloride emits Cl-, Cl-adsorbed on the surface of austenitic stainless steel through tidal interpretation, […]

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Corrosion Failure Analysis of Aluminum Alloy Flange of Current Transformer in ……

Substation current transformer (CT) is an important equipment of substation. It mainly undertakes the function of current conversion and electrical isolation, provides current for various instruments and relay protection, and isolates secondary system from high voltage to ensure the safety of person and equipment. Therefore, the normal operation of CT directly affects the safety and stability of substation transmission and transformation. On-the-spot investigation shows that the corrosion of CT pressure release film flange is serious in many substations in coastal areas, which directly affects the normal operation of CT and poses a serious threat to the safe and stable operation […]

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Process Pipeline

Process Pipeline:pipeline connecting fittings, flanges, valves, gaskets, bolts and nuts to meet certain production processes. Flanges,gaskets, bolts Flanges Threaded flanges Socket-weld flanges Slip-on flanges Lap joint flanges Weld neck flanges Blind flanges Special flanges Gaskets Spiral wound gaskets Camprofile gaskets Metal jacketed gaskets Bolts Double-headed bolt Single head bolt Nut Flange Flange is a part that connects the pipe to the tube and connects to the end of the pipe. Flange connection or flange joint refers to the removable connection of flange, gasket and bolt as a group of combined sealing structures. Pipeline flange refers to the flange used in piping equipment, and in equipment it refers to the import and export flange of equipment. There are holes […]

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Sealing and Leakage of Flange

Flange connection is one of the most common and important connection forms of pipeline, pipe fittings, valves, instruments and equipment in petrochemical plants. Connecting flange mainly relies on the pressure produced by its connecting bolt, through the flange gasket to achieve enough specific pressure of working seal to prevent the leakage of medium inside the pipeline and achieve sealing. Although this connection has the characteristics of easy disassembly and no fire, due to its own structural characteristics, improper treatment will lead to leakage, not only waste of resources, but also pollute the environment, and even cause casualties and property losses. […]

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Working Principle and Application Classification of Industrial Boiler

Boiler is a kind of energy conversion equipment. The energy input to the boiler includes chemical energy and electric energy in fuel. The boiler outputs steam, high temperature water or organic heat carrier with certain heat energy. Boilers can be divided into power plant boilers, industrial boilers, vehicle and marine boilers, domestic boilers and so on. Industrial boilers are boilers that provide steam or hot water (hot water boilers) for industrial and mining enterprises to meet the needs of production process, power and heating. Working principle The main working principle of the boiler is a kind of thermal equipment which […]

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Local Corrosion Resistance of Three Common Stainless Steels

The local corrosion resistance of 1Cr18Ni9Ti, 304 and 316L austenitic stainless steels with different trace elements was studied, including intergranular corrosion, pitting corrosion and stress corrosion. The results show that the addition of Ti and lower C content can improve the intergranular corrosion resistance; the solid solution 304 stainless steel with the highest Cr and N content is the most resistant to pitting corrosion; and the solid solution 316L with the highest Ni content is the best in 42% boiling magnesium chloride solution. Austenitic stainless steels have good room temperature and low temperature toughness, weldability, corrosion resistance and heat resistance, […]

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Analysis of internal corrosion causes of product oil pipelines before they are……

Abstract: Corrosion failure analysis of a west-located product pipeline before putting into operation was carried out in terms of analyzing the inspection corrosion data and the pipeline conditions as well as the macro-morphology observation, microstructure examination, analysis of chemical composition and constituents of corrosion products by means of SEM, EDS and XRD. The results showed that due to the large variation of the pipeline elevation and the insufficient cleaning up of the hydrotest water, thus there existed residual water at some low points of the pipeline. Where, water-line corrosion might occur as a result of oxygen concentration difference cell formed […]

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What are gate valves?

What are gate valves? Gate valves are gates with opening and closing parts. The movement direction of gate is perpendicular to the direction of fluid. Gate valve can only be fully opened and closed, and can not be adjusted and throttled. Gate valves are sealed by contact between the valve seat and gate plate. Metal materials are usually overlaid on the sealing surface to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. There are rigid gate and elastic gate. According to the difference of gate, gate valves are divided into rigid gate and elastic gate. Characteristics of gate […]

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What is OCTG?

What is OCTG? Oil Country Tubular Goods (OCTG), is a collection of rolled metal products, more commonly known as drill pipe, casing and tubing which are manufactured according to API specification. It used both onshore and offshoreiIn petroleum industry. Oil Country Tubular Goods are used both onshore and offshore. In the industry, they are also referred to by the acronym OCTG (for “Oil Country Tubular Goods”). Drill pipe is heavy seamless tube that rotates the drill bit and circulates drilling fluid. Pipe segments 30 ft (9m) long are coupled with tool joints. Drill pipe is simultaneously subjected to high torque […]

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