scholarly journals Failure Analysis of Shaft Circulating Water Pump (CWP) used in Power Plant

2018 ◽  
Vol 159 ◽  
pp. 02027 ◽  
Author(s):  
Abdul Hamid ◽  
Sri Nugroho ◽  
Gunawan Dwi Haryadi ◽  
Khaeroman
Keyword(s):  
Stainless Steel ◽  
Chemical Composition ◽  
Power Plant ◽  
Failure Analysis ◽  
Fatigue Cracking ◽  
Hardness Test ◽  
Water Pump ◽  
Circulating Water ◽  
Pump Shaft ◽  
Sem Test

Pump shafts are generally exposed to the liquid being pumped either on a continual basis or at certain locations along the length of the shaft. The shaft material is austenitic stainless steel, description ASTM AU 79 TY 316. The purpose of this study is to determine the failure of the water pump shaft used in the power plant. Metallography is the study of structure metal shaft can used as a means for CWP metal pelleting (Circulating Water Pump), for the purpose of damaged or deeply degraded areas. SEM test is used to know the beginning of the crack (crack initiation). EDS test is used to chemical composition and Vikers hardness test is also used to know the hardness material. These three tests to support in analyzing the failure of the pump shaft. The conclusion of this failure analysis is the shaft material has porosity. Fatigue cracking comes from the outer surface area.

Study on 3-D Flow Field of Concrete Volute Conduit of Circulating Water Pump in Nuclear Power Plant

2011 ◽  
Vol 99-100 ◽  
pp. 350-353
Author(s):  
Xiao Bing Sun ◽  
Xu Bin Qiao
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Stokes Equations ◽  
Three Dimensional ◽  
Gradual Change ◽  
Water Pump ◽  
Pump System ◽  
Circulating Water ◽  
Operating Modes

As the largest unit capacity of nuclear power plant at present, the flow conduit of circulating water pump in EPR1750 nuclear power plant is a volute conduit, which is a cast-in-situ conceret structure with complexly gradual change cavity. Therefore, the hydraulic efficiency of circulating water pump is not only related with the design of pump leaves, but also closely related to the design of volute and the complicated spatial type of intake and outtake conduits. With the pump leaves and the intake and outtake conduits of conceret volute as the research model, based on computational fluid dynamics (CFD)and the three dimensional Reynolds averaged Navier-Stokes equations, an analytic model suitable for computation is established to simulate the three-dimensional steady flow in the whole pumping system under different operating modes. By use of the commercial fluid-computation softer ANSYS, the distribution of basic physic quantities in the fluid field inside the pump and the conduits is obtained. The analysis and prediction of the performance of pump system are made, and the spatial type design of intake and outtake conduits is evaluated. The calculation results can be referenced to improve the design of pump systems in the similar projects.

Fracture Failure Analysis of 304 Stainless Steel Elbow

2018 ◽  
Author(s):  
Yian Wang ◽  
Guoshan Xie ◽  
Libin Song ◽  
Meng He ◽  
Fakun Zhuang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Chemical Composition ◽  
Hydrogen Embrittlement ◽  
Failure Analysis ◽  
Hydrogen Content ◽  
Fracture Morphology ◽  
Optical Microscope ◽  
304 Stainless Steel ◽  
High Hydrogen ◽  
Delayed Cracking

A cracking incident of a 304 stainless steel elbow serving in the synthesis gas purification device occurred during running. In order to get an understanding of the failure mechanism, a failure analysis was performed on the cracked elbow in this paper. The chemical composition, mechanical properties of strength, toughness and hardness, hydrogen content were identified and determined. The metallographical structure was observed and analyzed by optical microscope (OM) and X-Ray Diffraction (XRD), while the fracture morphology was observed by scanning electron microscope (SEM). The results showed that the chemical composition of the cracked elbow meet the requirements for China standard, while comparing with GB/T 14976-2012 standards, the strength and elongation of the leaked elbow are higher and lower respectively, and the hardness of the leaked elbow was higher than quality certificate documents that of HB ⩽ 187. Large quantities of martensite and δ-ferrite were observed in elbow, which indicated that the elbow was not well solid solution heat treated required by specification (1050°C,30min). The fracture morphology presents typical brittle fracture. The hydrogen content of cracked elbow was significant higher than that of other 304 stainless steel elbow serving in the environment without hydrogen. It is acknowledged that martensite showed higher sensitivity of hydrogen embrittlement compared with austenite. Furthermore, the operating temperature of cracked elbow was in the range of high hydrogen embrittlement sensitivity. Depending on the metallographical structure, strength, service environment, hydrogen content and fracture morphology, it can be concluded that hydrogen induced delayed cracking was the dominant mechanism of the failure.

Failure Analysis of Stress Corrosion Crack of 1Cr18Ni9 Stainless Steel Cylinder Body

2012 ◽  
Vol 591-593 ◽  
pp. 1094-1097
Author(s):  
De Qiang Wei ◽  
Xin Dong ◽  
Shan Qiu Li
Keyword(s):  
Stainless Steel ◽  
Failure Analysis ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Xrd Analysis ◽  
Corrosion Cracking ◽  
Steel Cylinder ◽  
Circulating Water ◽  
Piston Cylinder ◽  
Electron Microscopy Analysis

As a kind of corrosion resistant material, stainless steel is widely used in petroleum, chemical, pharmaceutical. Stress corrosion cracking is a main reason that why the stainless steel became disabled. Therefore, it is very necessary to research and study the stress corrosion cracking of stainless steel .The failure analysis to the sample is conducted aiming at the stress corrosion of the stainless steel piston cylinder in a factory. The analysis includes macro analysis, metallographic observation, scanning electron microscopy analysis and XRD analysis. The results of the study show that it is nonmetallic inclusion on the grain boundary, the chloridion in the industrial circulating water and the rough columnar austenitic grains in the organization of the samples that lead to the stress corrosion cracking of the piston cylinder.

scholarly journals FAILURE ANALYSIS ON SLINGER DISK PIPE OF PURIFIED TEREPHTALIC ACID (PTA) VESSEL

2020 ◽  
Vol 14 (2) ◽  
pp. 87-92
Author(s):  
Sukandar Sukandar ◽  
Triwibowo Triwibowo ◽  
Yana Heryana
Keyword(s):  
Chemical Composition ◽  
Failure Analysis ◽  
Fatigue Fracture ◽  
Weld Joint ◽  
Hardness Test ◽  
Hot Water ◽  
Bending Stress ◽  
Shell Wall ◽  
Cause Of Failure ◽  
Load Effects

Slinger disk pipe is a rotary part of PTA vessel with function as anti-fog by swinging hot water to the shell wall to remove solid PTA at the shell wall. Failure took place on this slinger disk pipe. The purpose of failure analysis is to find the root cause of failure. Methods conducted in this failure analysis are examination and testing of fractography, metallography, chemical composition, hardness, and calculation of bending stress. Examination on the fracture surface by fractographic method revealed fatigue fracture with the presence of multiple beachmarks. The position of those multiple beachmarks gave indication of alternation rotation of slinger disk pipe. Examination by metallographic method revealed that initial cracks initiated from heat affected zone of pipe and strengthening plates weld joint. However, result of chemical composition examination and hardness test showed that material of slinger disk pipe were in accordance with lean duplex 2205. Calculation of bending stress gave supporting data of various load effects to slinger disk pipe. Therefore, failure of the slinger disk pipe was caused by fatigue fracture which were initiated from head affected zone of pipe and strengthening plates weld joint.

scholarly journals The design of a circulating water pump for a power plant based on CFD

2020 ◽  
Vol 194 ◽  
pp. 03026
Author(s):  
Wanbo Chen
Keyword(s):  
Power Plant ◽  
Guide Vane ◽  
Flow State ◽  
Water Pump ◽  
Mixed Flow ◽  
High Discharge ◽  
Circulating Water ◽  
Cfd Method ◽  
Flow Pump

Because of the head and efficiency of the circulating water pump in a power plant could not satisfy application requirement, the guide vane and impeller were optimized according to the CFD method. The optimization of the mixed-flow pump effectively improves the flow state at the design and high discharge conditions. Finally, the CFD results show that the head is improved by 3.49m and the efficiency is improved by 3.16% after the optimization, which has met the use requirements.

scholarly journals Failure Analysis Of Water Pump Shaft

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Didik Ariwibowo
Keyword(s):  
Tensile Stress ◽  
Failure Analysis ◽  
Ultimate Strength ◽  
Raw Material ◽  
Water Pump ◽  
Foreign Material ◽  
Material Identification ◽  
Pump Shaft ◽  
Strength Material ◽  
The Difference

Abstract- A water pump shaft for utility water raw material was failed. The shaft was broken into two parts. While in dismantling, the sand was found in chamber between bearing and shaft. There was also a bolt in the impeller. According to reports, the pump has been repaired and since there was no replacement shaft but the shaft was reused in reverse position. There was no inspection of the shaft when it was disconnected by operational reasons. The failure analysis of the broken-shaft was performed to investigate the cause of the failure. Two inspection and analysis were perfomed those are visual inspection and material identification and analysis. When material analysis of the shaft was carried out there was difference between examination and data specification of the shaft.The material identification indicate that the material was AISI SS 304 whereas specification data states SS 316. Both materials have similar tensile stress, so the difference was not the contributor of the failure. The present of foreign material was consider as the cause of the failure. The foreign material caused to stucked on rotation of shaft and increasing in tensile of the shaft over its ultimate strength. Keywords – vertical pump, tensile stress, ultimate strength, material identification  

Failure analysis of a broken SA564 stainless steel pump shaft

2021 ◽  
Vol 62 (1/2/3) ◽  
pp. 152
Author(s):  
Patthi Bin Hussain ◽  
Nagoor Basha Shaik ◽  
Ainul Akmar Binti Mokhtar ◽  
Balaji Bakthavatchalam ◽  
Faiz Ahmad ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Failure Analysis ◽  
Pump Shaft

Failure analysis of a broken SA564 stainless steel pump shaft

2021 ◽  
Vol 62 (1/2/3) ◽  
pp. 152
Author(s):  
M. Shairul Bin Harun ◽  
Faiz Ahmad ◽  
Ainul Akmar Binti Mokhtar ◽  
Balaji Bakthavatchalam ◽  
Patthi Bin Hussain ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Failure Analysis ◽  
Pump Shaft
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