scholarly journals Statistical characteristics of pit depth observed on inner surface of carbon steel pipes.

1987 ◽  
Vol 36 (400) ◽  
pp. 47-51
Author(s):  
Katsumi MASAMURA ◽  
Iwao MATSUSHIMA
Keyword(s):  
Carbon Steel ◽  
Statistical Characteristics ◽  
Steel Pipes ◽  
Inner Surface ◽  
Pit Depth

Atmospheric Corrosion Behavior Assessment of Carbon Steel Pipes Using Cyclic Salt Spray Test

2015 ◽  
Vol 658 ◽  
pp. 42-52
Author(s):  
Polporn Chatisathien ◽  
Nuttapon Suttitam
Keyword(s):  
Carbon Steel ◽  
Corrosion Behavior ◽  
Atmospheric Corrosion ◽  
Salt Spray ◽  
Metals And Alloys ◽  
Salt Spray Test ◽  
Cover Plate ◽  
Steel Pipes ◽  
Inner Surface ◽  
Welded Pipe

Accelerated atmospheric corrosion behavior of carbon steel pipes subjected to cyclic salt spray test was performed according to ISO 14993 – Corrosion of metals and alloys – Accelerated testing involving cyclic exposure to salt mist, “dry” and “wet” conditions [1]. In order to investigate the effect of degree of exposure to environment of inner surface of the pipe on corrosion behavior of inner surface of the specimens, degree of completeness of weldment, 0%, 50%, 80%, and 100%, of steel cover plate is varied. Exposure times in this study are 168, 336, and 504 hours which can be correlated to 10, 20, and 30 years exposed to C3 corrosivity category according to the definition of ISO 9223 – Corrosion of metals and alloys – Corrosivity of atmospheres – Classification, determination and estimation [2,3]. After testing, visual inspection on outer and inner surfaces of the specimens were performed. In addition, average corrosion rate of the specimens were performed according to ISO 8407 – Corrosion of metals and alloys – Removal of corrosion products from corrosion test specimens [4]. The results show that as-received steel pipe specimens exhibited great degree of corrosion attack on the inner surface of the specimens while slight amount of corrosion was observed from the welded pipe specimens.

Evaluation of Corrosion in Carbon Steel Pipes by Laser-Generated Guided Wave

2010 ◽  
pp. 87-94 ◽  
Author(s):  
Do-Youn Kim ◽  
Joon-Hyun Lee ◽  
Younho Cho ◽  
Jaesun Lee ◽  
Jan D. Achenbach
Keyword(s):  
Carbon Steel ◽  
Guided Wave ◽  
Steel Pipes

Corrosion of Coated Pipe Samples: An Overview and Statistical Analysis of NBS-API Data

2016 ◽  
Author(s):  
Olivier Daigle ◽  
Mahesh D. Pandey
Keyword(s):  
Statistical Analysis ◽  
American Petroleum Institute ◽  
National Bureau ◽  
Data Set ◽  
Soil Corrosion ◽  
Steel Pipes ◽  
Wrought Iron ◽  
Depth Data ◽  
Pit Depth ◽  
Corrosion Of Iron

The National Bureau of Standards (NBS) had undertaken a comprehensive study of underground soil corrosion of iron pipes and plates. The maximum pit depth data for different types of wrought iron and carbon steel pipes have been widely analyzed and utilized in the corrosion literature. There is another important but relatively obscure data set about the testing of pipes with bituminous coating that NBS carried out in collaboration with the American Petroleum Institute (API). This program tested dozens of coatings on operating line pipes as well as short sections of pipes at 15 soil sites over a 10 year period (1930–1940). This paper presents an overview of this data and presents statistical analysis of protection offered by coatings.

Experimental Investigation Into the Relationship Between the Roughness Height in Use With Nikuradse or Colebrook Roughness Functions and the Internal Wall Roughness Profile for Commercial Steel Pipes

2016 ◽  
Vol 138 (8) ◽  
Author(s):  
K. K. Botros
Keyword(s):  
Carbon Steel ◽  
Roughness Height ◽  
Outer Diameter ◽  
Wall Roughness ◽  
Steel Pipes ◽  
Roughness Profile ◽  
Wide Range ◽  
Commercial Carbon ◽  
Commercial Steel ◽  
The Relationship

The relationships between the sand grain roughness height (ks) in use with Nikuradse or Colebrook correlations for the roughness function (RF) and the internal pipe wall roughness element described by the root-mean-square (RMS) of the roughness profile (Rq) for turbulent flow in pipes are experimentally examined. Flow tests were conducted on a total of 13 commercial steel pipes of two sizes: 168.3 mm and 114.3 mm outer diameter (OD). The aim was to provide further insight into relationship between ks and Rq, for use with either RF correlations. The tests were conducted on high-pressure pipeline quality natural gas in the range of Reynolds number (based on pipe internal diameter) of 9 × 106–16 × 106. For commercial carbon steel pipes, the relationship between ks and Rq was found in the form ks=1.306  Rq+0.078  Rq2 and ks=2.294  Rq (both ks and Rq in μm), for use with Colebrook and Nikuradse RF correlations, respectively. These correlations cover a wide range of Rq from 2.7 μm to 12.5 μm which is typically found in commercial carbon steel pipes. For stainless steel (SS) pipes, preliminary results indicate that other surface roughness profile parameters need to be employed to better define the values of ks for these types of commercial steel pipes.

Application of Laser-Generated Ultrasound for Evaluation of Thickness Reduction in Carbon Steel Pipes

2006 ◽  
Vol 321-323 ◽  
pp. 743-746 ◽  
Author(s):  
Jong Ho Park ◽  
Joon Hyun Lee ◽  
Gyeong Chul Seo ◽  
Sang Woo Choi
Keyword(s):  
Carbon Steel ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Guided Wave ◽  
Thickness Reduction ◽  
Steel Pipes ◽  
Time Frequency ◽  
Wall Thinning ◽  
Local Wall Thinning

In carbon steel pipes of nuclear power plants, local wall thinning may result from erosion-corrosion or flow-accelerated corrosion(FAC) damage. Local wall thinning is one of the major causes for the structural fracture of these pipes. Therefore, assessment of local wall thinning due to corrosion is an important issue in nondestructive evaluation for the integrity of nuclear power plants. In this study, laser-generated ultrasound technique was employed to evaluate local wall thinning due to corrosion. Guided waves were generated in the thermoelastic regime using a Q-switched pulsed Nd:YAG laser with a linear slit array. . In this paper, time-frequency analysis of ultrasonic waveforms using wavelet transform allowed the identification of generated guided wave modes by comparison with the theoretical dispersion curves. Modes conversion and group velocity were employed to detect thickness reduction.

Numerical Simulation of Turbulent Flow in Carbon Steel Pipes Leading to Flow Accelerated Corrosion

2014 ◽  
Vol 39 (8) ◽  
pp. 6435-6451 ◽  
Author(s):  
Rani Hari Ponnamma ◽  
Divya Teegala ◽  
Sahaya Ravi Ranjan ◽  
Vivekananda Kain ◽  
Barua Dipak Kumar
Keyword(s):  
Numerical Simulation ◽  
Carbon Steel ◽  
Turbulent Flow ◽  
Accelerated Corrosion ◽  
Steel Pipes ◽  
Flow Accelerated Corrosion
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