scholarly journals Failure analysis for tube bundle of methanol condensation recovery heat exchanger

2021 ◽  
Vol 267 ◽  
pp. 02033
Author(s):  
Jiang Chengjun ◽  
Wang Wei ◽  
Xue xiaolong ◽  
Fan gaoping ◽  
Wang Xin
Keyword(s):  
Heat Exchanger ◽  
Tube Bundle ◽  
Hardness Test ◽  
Fracture Analysis ◽  
Metallographic Analysis ◽  
Composition Analysis ◽  
Exhaust Gas ◽  
Shell Side ◽  
Chemical Company ◽  
Chemical Composition Analysis

The S30408 tube bundle of methanol condensation recovery heat exchanger in a chemical company was found leaked during use. The cause of tube bundle leakage was analyzed by means of macroscopic inspection, chemical composition analysis, metallographic analysis, hardness test and leakage fracture analysis. The results show that formic acid and chloride condensate are formed by the exhaust gas in the shell side near the outlet of the shell side, which results in the spot corrosion and stress corrosion cracking of the tubes. Surface coating or replaced material is recommended to prevent such failure.

Fracture Failure Analysis of N80 Q Marine Casing

2013 ◽  
Vol 318 ◽  
pp. 331-335
Author(s):  
Hong Zhang ◽  
Quan Luo ◽  
Xu Hui Liu ◽  
Peng Wang ◽  
Ding Feng
Keyword(s):  
Mechanical Properties ◽  
Fracture Analysis ◽  
Metallographic Analysis ◽  
Composition Analysis ◽  
Service Environment ◽  
Fracture Failure ◽  
Completion Process ◽  
Casing Pipe ◽  
Chemical Composition Analysis ◽  
Mechanical Properties Testing

The 13-3/8〞casing of a well was bent down and broken off in the marine development completion process. The cause for the fracture is systematically analyzed by means of chemical composition analysis, mechanical properties testing, macro and micro fracture analysis and metallographic analysis. The results indicate that, the heterogeneity of the casing material and large oxide metallurgical inclusions found in fracture place severely reduce the properties of the material, which lead to the failure of casing pipe in bad service environment.

scholarly journals Fracture analysis for lubricating oil pipe of compressor

2021 ◽  
Vol 236 ◽  
pp. 01050
Author(s):  
Jun SI ◽  
Huating LV ◽  
Facai REN
Keyword(s):  
Chemical Composition ◽  
Fatigue Fracture ◽  
Fracture Analysis ◽  
Lubricating Oil ◽  
Metallographic Analysis ◽  
Composition Analysis ◽  
Chemical Composition Analysis

The rupture analysis of lubricating oil pipe has been conducted through chemical composition analysis, metallographic analysis and fracture analysis. The analysis results show that there are machining defects and bidirectional vibration at the joint of lubricating oil pipe, which leads to fatigue fracture.

The Analysis on Causes of Rupture for a Sucker Rod Made of 20CrMo Alloy

2011 ◽  
Vol 295-297 ◽  
pp. 626-630 ◽  
Author(s):  
Yong Jun Bian ◽  
Wei Shi ◽  
Jin Yue Lao ◽  
Jie Chen ◽  
Shu Ling Sun
Keyword(s):  
Stress Corrosion ◽  
Fracture Analysis ◽  
Composition Analysis ◽  
Metal Impurity ◽  
Metallographic Examination ◽  
Service Load ◽  
Sucker Rod ◽  
Chemical Composition Analysis ◽  
Corrosion Pits ◽  
Stress Fatigue

Multiple types of analysis and examinations are applied to analyze the causes of rupture for a sucker rod made of 20CrMo alloy. Based on the results from macro- and micro-fracture analysis, chemical composition analysis, mechanics test and metallographic examination, the generation of cracks can be attributed to the irregularity and impurity in the coating of sucker rod; the stress fatigue from pulling and pressing and the stress corrosion. There is severe banded segregation, non-metal impurity and un-dissolved ferrite in the interior of the rod, meanwhile the poor heat treatment causes the property differences between the surface and core structures of the rod, thus reduces the overall properties of fatigue- and corrosion-resistance. Stress corrosion makes pits from cracks; the expansion of such corrosion pits reduces the size of effective loading area; and the failure to endure service load due to the reduction of loading area finally causes sudden rupture of the rod.

Research on Stress Intensity of Variable Cross-Section H-Type Structure in Heat Exchanger with Longitudinal Flow of Shell Side

2015 ◽  
Vol 750 ◽  
pp. 166-171 ◽  
Author(s):  
Zun Chao Liu ◽  
Ke Wang ◽  
Xin Gu ◽  
Min Shan Liu
Keyword(s):  
Heat Exchanger ◽  
Cross Section ◽  
Maximum Stress ◽  
Tube Bundle ◽  
Plate Thickness ◽  
Variable Cross Section ◽  
Type Structure ◽  
Variable Cross ◽  
Shell Side ◽  
Ring Plate

The variable cross-section H-type structure, which is used in the new type of heat exchanger with longitudinal flow of shell side, could reduce the scour action of imports fluid on the tube bundle and prevent vibration of the tube bundle. It could also improve the state of the shell side fluid flow, reducing the flow dead zone, allowing for a more efficient use of the heat transfer area and improving the energy efficiency. The new structure will make the temperature and stress distribution in the heat distribution more complex, so it is necessary to analyze the stress intensity of the variable cross-section H-type structure. A three-dimensional finite element model of the variable cross-section H-type structure is established in this paper, and the surface temperature of the various parts of the heat exchanger are determined through temperature analysis. Using ANSYS Workbench software, thermal-stress analysis of the H -type structure with different structural parameters is tested, and the temperature and stress field are obtained. The results show that a Ring plate of H-type structure has a larger temperature gradient along the thickness direction. The maximum stress of the heat exchanger is 203.13 MPa, which occurred on the connections of the ring plate and jacket in the lower temperature side. The ring plate thickness of the H-type structure has a significant influence on its maximum stress. Therefore, a reasonable selection of ring plate thickness is important for the safety of the heat exchanger.

Two-Phase Flow Pressure Drop Model for a Shell Side of a Shell of Heat Exchanger

2013 ◽  
Vol 465-466 ◽  
pp. 613-616 ◽  
Author(s):  
Azmahani Sadikin ◽  
Nor Zelawati Asmuin
Keyword(s):  
Heat Exchanger ◽  
Pressure Drop ◽  
Momentum Flux ◽  
Liquid Fraction ◽  
Tube Bundle ◽  
Shell Side ◽  
Two Phase ◽  
Flow Pressure ◽  
Shell And Tube ◽  
Phase Pressure

This paper present a two-phase pressure drop model for a in-line tube bundle for airwater mixtures flowing through an idealised shell and tube, in-line heat exchanger. The model used momentum flux and entrained liquid fraction to predict the acceleration pressure drop. The model predicts the pressure drop well using both accelaration and gravitational pressure drop deduced from data available in open literature. The model is shown to be mass flux dependence.

scholarly journals Failure Analysis of Clamp Crack on TA Equipment in Converter Station

2020 ◽  
Vol 165 ◽  
pp. 06052
Author(s):  
Jun Wang ◽  
Junling Tan ◽  
Jun Liu ◽  
Jie Gong ◽  
Jiarui Hu ◽  
...  
Keyword(s):  
Performance Test ◽  
Hardness Test ◽  
Composition Analysis ◽  
Scanning Electron Microscope Analysis ◽  
Tensile Performance ◽  
Electron Microscope Analysis ◽  
Chemical Composition Analysis ◽  
Selection Of ◽  
Scanning Electron

Through macro inspection, chemical composition analysis, hardness test, tensile performance test, microstructure inspection and scanning electron microscope analysis, the causes of clamp crack on TA equipment in the 500kV AC filter field of the ± 800kV converter station were analyzed. The results show that improper selection of the manufacturing process of the equipment clamps will cause more micro-defects inside it, leading to poor mechanical properties and excessive internal stress, which are the main causes of cracking. Corresponding measures are put forward to improve the manufacturing quality of equipment clamps, which can avoid similar failures from happening again.

scholarly journals Effect of segmental baffles on the shell-and-tube heat exchanger effectiveness

2014 ◽  
Vol 68 (2) ◽  
pp. 171-177 ◽  
Author(s):  
Mica Vukic ◽  
Mladen Tomic ◽  
Predrag Zivkovic ◽  
Gradimir Ilic
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Tube Bundle ◽  
Experimental Investigations ◽  
Shell Side ◽  
Cool Water ◽  
Pressure Drops ◽  
Tube Heat Exchanger ◽  
Flow And Heat Transfer ◽  
Shell And Tube

In this paper, the results of the experimental investigations of fluid flow and heat transfer in laboratory experimental shell-and-tube heat exchanger are presented. Shell-and-tube heat exchanger is with one pass of warm water on the shell side and two passes of cool water in tube bundle. Shell-and-tube heat exchanger is with 24x2 tubes (U-tube) in triangle layout. During each experimental run, the pressure drops and the fluid temperatures on shell side, along the shell-and-tube heat exchanger (at positions defined in advance) have been measured. Special attention was made to the investigation of the segmental baffles number influence of the shell-and-tube heat exchanger effectiveness.

scholarly journals Failure Analysis of Weld Cracking in External Cold Water Pipeline of Condenser in Converter Station

2020 ◽  
Vol 165 ◽  
pp. 06031
Author(s):  
Jun Wang ◽  
Yaxia Qiao ◽  
Hao Zhang ◽  
Hongjian Lou
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cold Water ◽  
Welding Process ◽  
Hardness Test ◽  
Control Measures ◽  
Composition Analysis ◽  
Chemical Composition Analysis ◽  
Water Pipeline ◽  
Scanning Electron

The cause of weld cracking in external cold water pipeline of condenser in a ±800kV converter station were analyzed by macro inspection, chemical composition analysis, hardness test, microstructure inspection, scanning electron microscopy and energy spectrum test methods.The results show that the main reason for the cracks is that the material and manufacturing process are not qualified, and the welding process is not good. Corresponding control measures are put forward to avoid similar failures from happening again.

scholarly journals Configuration Optimization and Performance Comparison of STHX-DDB and STHX-SB by A Multi-Objective Genetic Algorithm

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1794 ◽  
Author(s):  
Zhe Xu ◽  
Yingqing Guo ◽  
Haotian Mao ◽  
Fuqiang Yang
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Tube Bundle ◽  
Optimization Method ◽  
Shell Side ◽  
Tube Heat Exchanger ◽  
Side Pressure ◽  
Heat Transfer Capacity ◽  
Shell And Tube ◽  
Optimal Configurations

Based on the thermohydraulic calculation model verified in this study and Non-dominated Sorted Genetic Algorithm-II (NSGA-II), a multi-objective configuration optimization method is proposed, and the performances of shell-and-tube heat exchanger with disc-and-doughnut baffles (STHX-DDB) and shell-and-tube heat exchanger with segmental baffles (STHX-SB) are compared after optimization. The results show that, except in the high range of heat transfer capacity of 16.5–17 kW, the thermohydraulic performance of STHX-DDB is better. Tube bundle diameter, inside tube bundle diameter, number of baffles of STHX-DDB and tube bundle diameter, baffle cut, number of baffles of STHX-SB are chosen as design parameters, and heat transfer capacity maximization and shell-side pressure drop minimization are considered as common optimization objectives. Three optimal configurations are obtained for STHX-DDB and another three are obtained for STHX-SB. The optimal results show that all the six selected optimal configurations are better than the original configurations. For STHX-DDB and STHX-SB, compared with the original configurations, the heat transfer capacity of optimal configurations increases by 6.26% on average and 5.16%, respectively, while the shell-side pressure drop decreases by 44.33% and 19.16% on average, respectively. It indicates that the optimization method is valid and feasible and can provide a significant reference for shell-and-tube heat exchanger design.

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