scholarly journals Study of internal corrosion on the turning angles in steel pipes

2021 ◽  
Vol 225 ◽  
pp. 01004
Author(s):  
Bauyrzhan Manapbayev ◽  
Bazartai Alimbayev ◽  
Erkegali Amanbayev ◽  
Arman Kabdushev ◽  
Zhangazy Moldamuratov
Keyword(s):  
Fluid Flow ◽  
Centrifugal Force ◽  
Average Rate ◽  
Internal Corrosion ◽  
Steel Pipes ◽  
Corrosion Propagation

Corrosive damages can lead to accidents on pipelines in various industries. Therefore, the main objective of the work is to study the peculiarities of propagation of internal corrosion on turning angles in steel pipes. The paper substantiates the primary importance of the propagation of corrosion on turning angles in steel pipes. It has been identified that in curvilinear areas, the rate of corrosion propagation depends on the rate of fluid flow, on the number of ions, and also on the effect of centrifugal force. The authors studied the average rate of corrosion propagation on the turns in steel pipes. Thus, the results obtained showed that the location of steel pipes affect the rate of corrosion propagation inside the pipes.

scholarly journals INTERNAL CORROSION PROPAGATION IN CURVED SECTIONS OF STEEL PIPES

2019 ◽  
Vol 4 (436) ◽  
pp. 213-321 ◽  
Author(s):  
S. Orynbayev ◽  
◽  
E. Amanbayev ◽  
B. Alimbayev ◽  
B. Manapbayev ◽  
...  
Keyword(s):  
Internal Corrosion ◽  
Steel Pipes ◽  
Corrosion Propagation

Conservation Low of Centrifugal Force and Its Application to Fluid Flow in Turbomachinery

2006 ◽  
Author(s):  
Takaharu Tanaka
Keyword(s):  
Fluid Flow ◽  
Centrifugal Force ◽  
Rotational Motion ◽  
Constant Angular Velocity ◽  
Axis Of Rotation ◽  
Impeller Outlet ◽  
Pump Head ◽  
Rotational Motions ◽  
The Difference ◽  
Circular Line

Theoretical pump head is discussed and the conservation low is introduced on Centrifugal force. Theoretical head obtained by the application of conservation law on fluid flow in rotating flow passage is formed as the difference between the head obtained at the impeller outlet and that at impeller inlet. Conservation low of Centrifugal force due to fluid particles rotational motion at constant angular velocity says that the magnitude of Centrifugal force caused by the rotational motion along the outside circular line is constructed from those caused by the rotational motions along two different kinds circular lines. One is that caused by the rotational motion along the inside circular line whose rotational center locates at the axis of rotation. And the other is that caused by the rotational motion along the circular line whose circular line touches internally with the outer circular line and locates its rotational center on the inside circular line.

scholarly journals FLUID FLOW AND INERTIAL FORCES IN BLACK HOLE SPACE–TIMES

2003 ◽  
Vol 18 (07) ◽  
pp. 1091-1106 ◽  
Author(s):  
BANIBRATA MUKHOPADHYAY ◽  
A. R. PRASANNA
Keyword(s):  
Boundary Condition ◽  
Black Hole ◽  
Fluid Flow ◽  
Centrifugal Force ◽  
Equatorial Plane ◽  
Equations Of Motion ◽  
Fluid Flows ◽  
Azimuthal Velocity ◽  
Inertial Forces

We discuss the nature of the radial and azimuthal components of centrifugal force associated with fluid flows in the equatorial plane of black hole space–times. The equations of motion are solved for the radial and azimuthal components of the three-velocity Vi which are then used in evaluating the nature of the various components of inertial accelerations. It is shown that the reversal of centrifugal force is governed mainly by the dominance of the azimuthal velocity and the reversal occurs for r, mostly at 2m ≲ r ≲ 3m, depending upon the boundary condition.

Predicting the effect of water quality on water distribution cast iron and steel pipes using two novel indices

2017 ◽  
Vol 18 (2) ◽  
pp. 524-538
Author(s):  
Marc Philibert ◽  
Sofia Mendaza ◽  
Flavia Zraick ◽  
Benjamin Rabaud
Keyword(s):  
Cast Iron ◽  
Corrosion Rate ◽  
Water Distribution ◽  
Iron Particle ◽  
Distribution Networks ◽  
Pilot Scale ◽  
Internal Corrosion ◽  
Iron And Steel ◽  
Particle Release ◽  
Steel Pipes

Abstract The internal corrosion of cast iron and steel pipes is one of the main issues that drinking water distribution operators are facing. This study evaluated the relevance of 10 known corrosion indices according to their estimate of corrosion rate and iron particle release for 20 different water qualities. Pilot-scale contact trials were run over 45 days using cast iron and steel coupons. Corrosion rate was measured by coupon weight-loss and by an online linear polarization rate probe. Particle release was monitored by an online turbidimeter. The results showed that none of the indices properly predicted the level of risk associated with each water and that corrosion and particle release were not correlated. Two novel indices were developed to predict the corrosion and particle release risks independently of each other. The corrosion index showed a strong linear correlation with the corrosion rate of cast iron and slightly less reliable results for steel. The Particle Emission Index presented good correlation with turbidity in waters following contact with cast iron. These two indices thus showed interesting potential as tools to limit internal corrosion risks for metal pipes in water distribution networks.

scholarly journals Computer modeling of the results of laboratory studies of the development of internal corrosion of steel pipes

2020 ◽  
Vol 78 (4) ◽  
pp. 214-220
Keyword(s):  
Computer Simulation ◽  
Computer Modeling ◽  
Laboratory Studies ◽  
Internal Corrosion ◽  
Steel Pipes ◽  
Corrosion Of Steel

Discusses the development of corrosion in steel pipes. The results of computer simulation of internal corrosion development in various sections of steel pipes are presented.

scholarly journals VIBRATIONS OF STEEL PIPES AND FLEXIBLE HOSES INDUCED BY PERIODICALLY VARIABLE FLUID FLOW

2012 ◽  
Vol 31 (2) ◽  
pp. 63 ◽  
Author(s):  
Andrzej CZERWIŃSKI ◽  
Jan ŁUCZKO
Keyword(s):  
Fluid Flow ◽  
Steel Pipes

scholarly journals An Investigation of Internal Corrosion of Oil and Gas Transporting Carbon Steel Pipes in the Niger Delta Area of Nigeria

2017 ◽  
Vol 2 (8) ◽  
pp. 22
Author(s):  
Obotowo W. Obot ◽  
Charles N. Anyakwo
Keyword(s):  
Carbon Steel ◽  
Niger Delta ◽  
Oil And Gas ◽  
Co2 Corrosion ◽  
Corrosion Monitoring ◽  
Temperature Oxidation ◽  
Internal Corrosion ◽  
Delta Area ◽  
Steel Pipes ◽  
Corrosion Mechanisms

Internal corrosion of carbon steel pipes of oil and gas Companies in the Niger Delta area of Nigeria using coupons and ER probes is presented. Corrosion mechanisms for the lines vary with the fluid type and operational parameters. Aqueous corrosion with, in some cases CO2 corrosion additive, erosion corrosion and elevated temperature oxidation are corrosion mechanisms implicated in the pipes. No H2S-induced corrosion was observed for all the lines investigated. They act separately or synergistically to exacerbate the corrosion attack.  Application of inhibitors of the amine group drastically lowered the corrosion rates. Effective inhibition regime had in an instance markedly lowered the corrosion rate of a line from 42.7080mpy to 1.3447mpy. The ER probes incorporation offered a comparative corrosion monitoring alternative and provided insight into the real time conditions of the lines over prolonged periods of times. The exercise proved very useful in determining the corrosion status of the pipes and helped to determine the lines that should require immediate maintenance intervention to obviate possible ugly incidents of breakouts and ruptures.

Performance Analysis of a Two-Stage Electrohydraulic Servovalve in Centrifugal Force Field

2003 ◽  
Vol 125 (1) ◽  
pp. 166-170 ◽  
Author(s):  
Y. B. He ◽  
P. S. K. Chua ◽  
G. H. Lim
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Fluid Flow ◽  
Centrifugal Force ◽  
Weight Ratio ◽  
Centrifugal Forces ◽  
Earthquake Simulation ◽  
Centrifugal Acceleration ◽  
Two Stage ◽  
And Performance

Electrohydraulic servosystems are commonly used in various engineering applications due to their high power-to-weight ratio, good performance, and ease of control. Electrohydraulic servovalves are affected by centrifugal forces when they are used in the fields of spaceflight, earthquake simulation, and geotechnique. Based on theories of fluid dynamics and performance of an electrohydraulic servovalve, the fluid flow and structure of a two-stage electrohydraulic servovalve are analyzed when the valve is affected by centrifugal forces in operation. From calculation and experimental data it is found that centrifugal acceleration is directly proportional to null shift and the scale factor is formulated. Relevant methods to reduce the influence of the centrifugal force are provided.

Mist Generation During Metal Machining

2000 ◽  
Vol 122 (3) ◽  
pp. 544-549 ◽  
Author(s):  
Jonathan Thornburg ◽  
David Leith
Keyword(s):  
Fluid Flow ◽  
Health Effects ◽  
Centrifugal Force ◽  
Rotational Speed ◽  
Metalworking Fluids ◽  
Adverse Health Effects ◽  
Adverse Health ◽  
Metal Machining ◽  
Cut Depth

Use of metalworking fluids during machining results in a mist that is associated with adverse health effects. Experiments conducted on a small lathe quantified the amount of mist generated by evaporation/condensation, centrifugal force, and impaction. Evaporation/condensation was the most important mechanism, followed by centrifugal force, then impaction. For evaporation/condensation, rotational speed and cut depth determined the amount of heat generated during machining, whereas fluid flow determined the amount of heat transferred to the liquid. The flow-rotational speed interaction influenced mist generation by centrifugal force, whereas mist generation by impaction was determined only by fluid flow. [S0742-4787(00)01303-5]

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