Failure Analysis on a Non-Occupation Refined-Oil Pipeline

2016 ◽  
Vol 850 ◽  
pp. 977-983
Author(s):  
Feng Wang ◽  
Bin Feng ◽  
Bao Min Chu ◽  
Yu Ran Fan ◽  
Qiao Fei Sun ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Failure Analysis ◽  
Xrd Analysis ◽  
Experimental Results ◽  
Chemical Corrosion ◽  
Refined Oil ◽  
Oil Pipeline ◽  
Metallic Inclusions ◽  
Corrosion Pits ◽  
Corrosion Simulation

In this paper, the failure analysis was conducted on a non-occupation refined-oil pipeline, in which corrosion perforation occurs when the pipeline was filled with 1.2 MPa air for more than 1 year, and the material of the corrosion pipeline was L245. To find out the reason of the corrosion, some tests such as XRD analysis for corrosion products, corrosion pits analysis, inclusions and microstructure inspection, as well as corrosion simulation trial were conducted. The experimental results showed that the failure was caused by electro-chemical corrosion because of the dissolved oxygen, while the existence of 1.2 MPa inner air and non-metallic inclusions accelerated the corrosion.

scholarly journals Failure analysis and simulation model of pinhole corrosion of the refined oil pipeline

2019 ◽  
Vol 106 ◽  
pp. 104177 ◽  
Author(s):  
Qingshan Feng ◽  
Bingchuan Yan ◽  
Pengchao Chen ◽  
Siamack A. Shirazi
Keyword(s):  
Failure Analysis ◽  
Simulation Model ◽  
Refined Oil ◽  
Oil Pipeline

The Fracture Failure Analysis of Precision Centrifuge Spindle

2014 ◽  
Vol 971-973 ◽  
pp. 802-805
Author(s):  
Wei Feng Zhang ◽  
Li Yan ◽  
Fu Xia Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Chemical Composition ◽  
Fracture Mechanics ◽  
Failure Analysis ◽  
Fatigue Failure ◽  
High Speed ◽  
Experimental Results ◽  
Fracture Failure ◽  
Scanning Electron

For the problem of high-speed rotating centrifuge spindle fracture failures, relevant analyses are conducted from the perspective of microstructure, chemical composition and fracture mechanics by using scanning electron microscopy and related instruments. Experimental results and analyses indicate that the spindle fracture is fatigue failure, mainly caused by cold cracks generated on the journal surfacing. Based on the analysis results, improvements and measures are suggested to better solve the spindle weld fracture failure problems.

The cracking analysis of refined oil pipeline elbow

2021 ◽  
Author(s):  
jianwei jia ◽  
hui huang ◽  
jian liu ◽  
liqiu chen
Keyword(s):  
Refined Oil ◽  
Oil Pipeline

A Study on Reaeration in River Cascades

1987 ◽  
Vol 19 (5-6) ◽  
pp. 757-767
Author(s):  
Marcos von Sperling
Keyword(s):  
Dissolved Oxygen ◽  
Empirical Formula ◽  
Experimental Results ◽  
Cascade Systems ◽  
Sample Calculation ◽  
Positive Agreement

The reaeration caused by a series of natural cascades on the Arrudas River was studied. Experimental results were compared with theoretical ones given by formulae available in the literature and showed no positive agreement. An empirical formula was derived and further simplified for use in a more generalized way, giving very good correlation with observed dissolved oxygen values. This formula was tested in two other cascade systems, giving acceptable results. A sample calculation for a simulated situation is presented, showing the methodology to be employed in cascades of similar configuration.

Pitting Corrosion Failure Analysis of a Produced Oil/Water Fluid Pipeline

2019 ◽  
Vol 953 ◽  
pp. 39-44 ◽  
Author(s):  
Yun Ma ◽  
Zi Long Guo ◽  
Jiu Chun Qiao ◽  
Hai Tao Bai
Keyword(s):  
Failure Analysis ◽  
Pitting Corrosion ◽  
Corrosion Products ◽  
Background Information ◽  
Oil Well ◽  
Corrosion Failure Analysis ◽  
Corrosion Failure ◽  
Oil Pipeline ◽  
Oil Slick ◽  
Water Ratio

This paper presents corrosion failure analysis of an underground natural gas pipeline. The pipeline material grade is 20# steel. The pipeline transfers multiphase fluid (Crude oil and water) from an oil well to an oil gathering plant. A portion of the line failed due to pitting corrosion under unknown circumstances. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) are employed to characterize the scales and/or corrosion products near the failed portion. Based on visual and microscopic analyses and reviewing the background information, the following pitting corrosion sequences were identified: When the water ratio was smaller than 50%, the oil slick could cover the surface of the 20# test samples. Some uncovered surface would be corroded. When the water ratio was more than 70%, the surface of 20# steel contacted with more water. The average corrosion rate increased, and the corrosion products also formed, which would behave as a good diffusion barrier to prevent the underlying steel from further dissolution. Meanwhile, because of the corrosion products, the penetration rate also increased, the trend of local corrosion became weak with the water ratio continued to increase. The pitting corrosion varied with the water ratio because of the protection conferred by the oil slick or the corrosion product layer. Under such conditions, pits emerged on the steel surface until one of them grew faster and failed the oil pipeline.

Failure Analysis of Heavy Industrial Gas Turbine Engine First Stage Nozzel Guide Vane

2012 ◽  
Vol 445 ◽  
pp. 1047-1052
Author(s):  
Alaaeldin H. Mustafa
Keyword(s):  
Failure Analysis ◽  
Gas Turbine ◽  
Guide Vane ◽  
Xrd Analysis ◽  
Optical Microscope ◽  
Guide Vanes ◽  
X Ray ◽  
Nozzle Guide ◽  
Industrial Gas Turbine ◽  
Nozzle Guide Vanes

Failure analysis investigation was conducted on 70 MW set of 1st stage turbine nozzle guide vanes (NGVs) of heavy industrial gas turbine. The failure was investigated using the light optical microscope (LOM), X-ray diffraction analysis (XRD) and energy dispersive X-ray spectroscopy (EDS) in an environmental scanning electron microscope (ESEM). The results of the analysis indicate that the NGVs which were made of Co base superalloy FSX-414 had been operated above the recommended operating hours under different fuel types in addition to inadequate repair process in previous repair removal. The XRD analysis of the fractured areas sample shows presence ofwhich might indicate the prolonged operation at high temperature. Keywords: cobalt-base; nozzle guide vanes, gas turbine.

Failure Analsys of Wrapped Pin Joint of Composite and Metal

2012 ◽  
Vol 433-440 ◽  
pp. 514-519
Author(s):  
Jiang Sun ◽  
Blahouš Karel
Keyword(s):  
Failure Analysis ◽  
Failure Modes ◽  
Numerical Results ◽  
Filament Winding ◽  
Experimental Results ◽  
Tensile Failure ◽  
Composite Manufacturing

By filament winding technology, a pin hole can be formed in the process of composite manufacturing through wrapped fiber tow around pin, so fiber tows around the pin hole are continued. The paper presents the failure analysis for this kind of pin hole. The experimental results and numerical results show that the pin hole has a good tensile bearing ability. According to Hashin criteria, numerical results show that main failure modes are fiber tensile failure and matrix tensile failure which are agreed with the experimental results.

Interaction between Yttria Fully Stabilized Zirconia or Yttria-Zirconia Blended Face-Coat with Ti6Al4V during Investment Casting

2014 ◽  
Vol 1019 ◽  
pp. 302-310 ◽  
Author(s):  
Kalenda Mutombo ◽  
Christina Kgomo ◽  
P. Rossouw
Keyword(s):  
Electron Microscopy ◽  
Xrd Analysis ◽  
Experimental Results ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
X Ray ◽  
Hardness Tester ◽  
Alpha Case ◽  
Face Coat ◽  
Scanning Electron

The interaction between the Ti6Al4V alloy and the mould materials was investigated. The alpha-case was characterized by Vickers hardness tester, optical and scanning electron microscopy equipped with electron dispersive X-ray spectrometry (EDX). X-ray diffraction (XRD) analysis was performed on as cast and on YFSZ or YZ-Blended face-coats. From the experimental results, a distinct alpha-case formation was revealed. The YFSZ led to a thicker and harder alpha-case than the YZ-Blended face-coat. The EDX revealed the presence of Zr and Si elements in both alpha-cases. Therefore, from experimental results and thermodynamic calculations, pure ZrO2and SiO2may react with Ti.

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.

Sign in / Sign up

Export Citation Format

Share Document