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Selection and acceptance of hot-dip galvanized steel pipe in building installa……

Galvanized steel pipes have been widely used in construction and installation projects for hundreds of years. For example, pipeline installation projects are used to transport water, gas, steam and other fluids. In electrical installation projects, they are used for lighting, power, telephone, fire fighting, etc. The wire casing of the electrical system is laid. Hot-dip galvanizing of steel pipes is an anti-corrosion measure that reacts molten zinc and iron to form an alloy layer, thereby combining the substrate and the plating. Hot-dip galvanizing process: First, the steel pipe is pickled to remove iron oxide on the surface of the steel […]

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How to Install a Slip on Flange

Slip On flanges or SO flanges are commonly lower in price than weld-neck flanges, and to this effect are a popular choice for our customers. However, customers should bear in mind that this initial cost saving may be diminished by the additional cost of the two fillet welds required for proper installation. Moreover, weld-neck flanges have a higher life expentancy than slip-on flanges under duress. Slip on Flange is essentially a ring that is placed over the pipe end, with the flange face extending from the end of the pipe by enough distance to apply a weld bead on the inside diameter. The […]

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Nine measures to perfectly cope with corrosion of metal valves

Metal valves are arguably the most critical component structures in engineering equipment that are prone to corrosion failure. Generally, valve parts such as sealing surfaces, valve stems, diaphragms, and small springs of metal valves are generally made of primary materials. Valve bodies, valve covers, etc. are applicable to secondary or tertiary materials, and are used for high pressure, high toxicity, flammability, and easy Explosive, radioactive media valves use less corrosive materials. Metal valves not only have uniform corrosion of metal surfaces at any time under complex working conditions such as atmosphere or solution, but also pitting, crevice corrosion, intergranular corrosion, […]

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Study on initial corrosion behavior of carbon steel in simulated marine indust……

Abstract: Carbon steels as common structural material have been widely used for basic facilities with the development of the city. In these service environments, carbon steel would inevitably encounter the atmospheric corrosion. Especially, the corrosion of carbon steels exposed to coastal-industrial atmosphere is very outstanding. However, the initial corrosion mechanism of carbon steel subjected to coastal-industrial environment still need to be clarified, which would be vital for predicating the subsequent corrosion process. In addition, although many scholars studied the synergism of SO2 and Cl–, which obviously accelerates the corrosion of steel and reduces its service life, there is few research about […]

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Research progress in sulphur corrosion failure of alloy 690 and alloy 800 in h……

Abstract: As nuclear power operates at high temperature and high pressure, corrosion is considered as one of the issues that threaten the safe operation, though corrosion rarely occurs. To fully understand the electrochemical behavior of nuclear key materials and manage the corrosion degradation of these materials in a proactive manner, a great deal of work have been undertaken in lab. Some sulfur-related specie can cause corrosion degradation of metal materials. Steam generator (SG) is one of the most important components in nuclear power plant, and alloys 800 and 690 are the most frequently used as SG tubing alloys. Sulfur-induced corrosion […]

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Characteristics of Oxide Films Formed by Inconel Alloy 600 and Inconel Alloy 6……

Abstract:  In this paper, we have investigated the surface films formed on Inconel 600 and Inconel 690 in high-temperature and high-pressure water by using surface enhanced Raman spectroscopy. The inner layer of the surface film on Inconel 600 is a thin continuous Cr2O3 layer, and the outer layer is composed of discrete FeCr2O4/NiFe2O4 particles. The surface film on Inconel 690 is consisted of Cr2O3 solely. There are at least two possible explanations for the discrepancies in the identities of the surface oxides as found in the present SERS study versus those reported by other researchers. First, there is a significant difference in the […]

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Analysis of Corrosion-induced Invalidation of L320 Pipeline in Long Distance T……

Abstract:  The causes of leakage invalidation of a long-distance natural gas pipeline was analyzed. After excluding the mechanical damage and external factors, much emphasis was placed on the research on how corrosion and perforation could occur inside the steel pipeline. Various measures were taken to analyze the cause of corrosion and perforation, such as corrosion examination of coatings, chemical components analysis and microstructure observation of the steel pipe, detection of natural gas components and XRD analysis of corrosion products. The result showed that the occurrence of corrosion and perforation inside the steel pipeline was due to the synergistic action of oxygen corrosion, carbon […]

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How to identify refurbished valves

Nowadays, the valve market is complicated, and unscrupulous traders are making huge profits by refurbishing used valves as new ones, which brings great safety hazards to the installation project. Therefore, it is necessary to know how to identify the refurbished valve. At present, the main methods of refurbishing used valves are as below: Use iron and carbon steel to repair waste valves to refill them. Stick the registered trademarks of big brand manufacturers on the valve products of local small factories. Pretend to be the famous manufacturers, dealers, agents. Make steel print, classify ordinary class valves as D-class valves for profiteering. The refurbishment of the valve is extremely harmful, which not only […]

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The valve selection of waterworks

The conventional water production process of waterworks start from obtaining raw water, getting the raw water, getting sediment in the sedimentation tank, filtering the water in the filter tank to the water coming from the pumping house in the end. Valves need to be used in these processes. However, the requirements for the selection of valves in different parts are quite different. The main difference is the diameter, type and control method of the valve.   Valves used for water making system in tap water factory Valves used for obtaining raw water Valves used for obtaining raw water have relatively large diameters. They don’t need to be operated frequently. Most of […]

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Applications of the globe valves I

Globe valves with small diameters are usually connected by external threads or cutting sleeves. Globe valves with large diameters can also adopt flanged connections. Most of the globe valves are driven by handwheels or handles. A few high-pressure globe valves with large diameters or occasions which require automatic operation can also be electrically driven.  The flow resistance of the globe valve is great, and the closing torque is also great, which affect globe valve being used in places that requires large diameters. At present, the structure of the globe valve has been studied and improved at home and abroad to […]

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