Erosion-corrosion Behavior of 90o Horizontal Elbow in Single Phase Flow

doi:10.11902/1005.4537.2019.002

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (2): 115-122 DOI: 10.11902/1005.4537.2019.002

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Erosion-corrosion Behavior of 90^o Horizontal Elbow in Single Phase Flow

HU Zongwu¹, LIU Jianguo²(

), XING Rui³, YIN Fabo⁴

1 College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2 College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266580, China
3 Lanzhou Testing Technology Co. , Ltd. of Chinese Academy of Inspection and Quarantine, Lanzhou 730070, China
4 Qingdao OASIS Environmental & Safety Technology Co. , Ltd, Qingdao 266580, China

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Abstract

Single phase flow induced erosion-corrosion behavior of 90-degree horizontal elbow was investigated via a loop test device designed independently by means of weight loss measurement and surface analysis methods. The results indicate that the erosion-corrosion rates at different locations of the 90-degree horizontal elbow are different, which vary between 2.11 and 8.90 mm/a. The erosion-corrosion is more serious at the inner part of the elbow and the outer part nearby its outlet. The erosion-corrosion rates induced by single phase flow of 3.5% (mass fraction) NaCl solution are much higher than that in static solution for 20# steel, in other word, the fluid flush promotes the corrosion process, therefore, which is responsible to the significant increase of erosion-corrosion rates. As a consequence, pits and grooves emerged on the surface of steel pieces situated around the inner surface of the elbow, while the grooves show clearly preferred orientation, i.e. their longitudinal axis is consistent with the flow direction of local fluid.

Key words: single phase flow 90-degree horizontal elbow erosion-corrosion erosion-corrosion interaction corrosion morphology

Received: 07 January 2019

ZTFLH:

TG172.2

Fund: National Natural Science Foundation of China(51301201);Natural Science Foundation of Shandong Province(ZR2019MEM014)

Corresponding Authors: LIU Jianguo E-mail: liujianguo@upc.edu.cn

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Cite this article:

HU Zongwu, LIU Jianguo, XING Rui, YIN Fabo. Erosion-corrosion Behavior of 90^o Horizontal Elbow in Single Phase Flow. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 115-122.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.002 OR https://www.jcscp.org/EN/Y2020/V40/I2/115

Fig.1 Schematic diagram of the loop test device

Fig.2 Transverse (a) and longitudinal (b) cutaway views of the test elbow

Fig.3 Schematic diagrams of annular angle φ (a), axial angle θ (b), and sample numbers at the elbow (c, d)

Fig.4 Physical diagrams of the test elbow after encapsulation of all test samples: (a) inner part, (b) outer part

Fig.5 Erosion-corrosion rates in the different locations of the elbow: (a) annular angle φ=45°, 90° and 315°, (b) annular angle φ=135°, 225° and 270°

Fig.6 Erosion-corrosion morphologies of different specimens at axial angle φ=90° and φ=270° before removing corrosion products: (a) No.12, (b) No.15, (c) No.32, (d) No.35, (e) No.52, (f) No.55, (g) No.72, (h) No.75

Fig.7 Erosion-corrosion morphologies of different specimens at axial angle φ=90° and φ=270° after removing corrosion products: (a) No.12, (b) No.15, (c) No.32, (d) No.35, (e) No.52, (f) No.55, (g) No.72, (h) No.75

Fig.8 2D (a, b) and 3D (c, d) errosion-corrosion morphologies of two typical samples 21 (a, c) and 74 (b, d)

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