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Abstract: This study investigates pipe perforation and leakage caused by erosion from ammonium chloride crystallization in the top circulation system of heavy-oil catalytic cracking units. By analyzing the erosion and wear behavior of salt crystallization, areas prone to perforation are identified,...

Abstract: This study investigates the formation of the σ phase in austenitic heat-resistant steel pipe joints used in power plant boilers. Results show that different morphologies of the σ phase precipitate in austenitic steel joints after high-temperature aging. The formation...

Abstract: During a scheduled inspection at a petrochemical plant, pitting corrosion was detected in the base material of a TP304 ethylene pipeline elbow. To determine the cause and develop effective countermeasures, a comprehensive analysis was conducted, including evaluation of the base material’s...

Abstract In a thermal power plant project, small-diameter serpentine heat exchanger tubes were fabricated from 20G steel with dimensions of Ø25 × 3 mm, a bend angle of 180°, and a bend radius of 27.2 mm. The tubes were formed using a CNC top-roll tube bender. However, during the...

Abstract: A numerical simulation study of pipe cap hot forming was conducted using DEFORM-3D finite element analysis software to determine the optimal heating temperature and dimensions of the pipe cap blank. The results offer valuable guidance for the design and manufacturing of pipe caps. Pipe...

Abstract: A leakage occurred in the elbow section of the sampling pipeline connected to the liquid level gauge of a high-temperature reheat steam drain tank in a thermal power plant during normal operation. The root cause of the elbow failure was investigated using macroscopic observation, chemical...

This study investigates the cause of fracture in the reheat hot section drain pipe elbow of a 1000 MW ultra-supercritical thermal power unit on the B-side. A series of experimental analyses, including macroscopic morphology, metallographic structure, hardness, and mechanical property tests, were...

Abstract: A crack was found in the 321 stainless steel elbow of the condensate pipeline serving the hydrogen production unit at a petrochemical plant, resulting in medium leakage. The failure was investigated through metallographic examination, scanning electron microscopy, energy-dispersive...

Abstract: To enhance boiler safety, this paper analyzes a failure incident in the main steam pipe elbow of a self-contained power station boiler at a chemical fiber plant, caused by the improper use of carbon steel, which resulted in fracture and leakage. Through macroscopic inspection, wall...

Abstract During the operation of a nuclear power plant, repeated leakage occurred at the outer casing elbow of the double-walled pipe in the hydrogen supply system. To determine the cause, the cracked elbow was examined through macroscopic inspection, microstructural analysis, chemical composition testing,...

Abstract During maintenance at a power plant, it was discovered that the hardness in the welded joint area of a P91 main steam elbow was low. During construction, it is necessary to remove the heat-affected zones (HAZ) at the elbow's inlet and outlet welds to prevent the effects of repeated high-temperature...

Abstract To investigate the leakage issue at the elbow section of the surge pipe located in the top cover of a large hydropower station, PT (penetrant testing) was conducted on the weld seams, along with physical and chemical analysis of the base material. The findings revealed that the immediate...