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Research Papers: Pipeline Systems

Mechanical Properties Characterization and Finite Element Analysis of Epoxy Grouts in Repairing Damaged Pipeline

[+] Author and Article Information
Lim Kar Sing

Faculty of Civil Engineering and Earth
Resources,
Universiti Malaysia Pahang,
Lebuhraya Tun Razak, Gambang,
Kuantan 26300, Pahang, Malaysia
e-mail: limks@ump.edu.my

Nordin Yahaya

Faculty of Engineering,
School of Civil Engineering,
Universiti Teknologi Malaysia (UTM),
Skudai 81310, Johor, Malaysia
e-mail: nordiny@utm.my

Alireza Valipour

Department of Civil Engineering,
Shiraz Branch,
Islamic Azad University,
Shiraz 71993-3, Iran
e-mail: vali@iaushiraz.ac.ir

Libriati Zardasti

Faculty of Engineering,
School of Civil Engineering,
Universiti Teknologi Malaysia (UTM),
Skudai 81310, Johor, Malaysia
e-mail: libriati@utm.my

Siti Nur Afifah Azraai

Faculty of Engineering,
School of Civil Engineering,
Universiti Teknologi Malaysia (UTM),
Skudai 81310, Johor, Malaysia
e-mail: snafifah2@live.utm.my

Norhazilan Md Noor

Faculty of Engineering,
School of Civil Engineering,
Universiti Teknologi Malaysia (UTM),
Skudai 81310, Johor, Malaysia
e-mail: norhazilan@utm.my

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 12, 2018; final manuscript received October 12, 2018; published online November 12, 2018. Assoc. Editor: Kiminobu Hojo.

J. Pressure Vessel Technol 140(6), 061701 (Nov 12, 2018) (11 pages) Paper No: PVT-18-1012; doi: 10.1115/1.4041792 History: Received January 12, 2018; Revised October 12, 2018

Oil and gas pipelines are subjected to various types of deterioration and damage over long service years. These damaged pipes often experience loss of strength and structural integrity. Repair mechanisms have been developed in restoring the loading capacity of damaged pipelines, and composite repair systems have become popular over the past few years. The mechanical properties of the putty/grout are critical to their potential application as infill materials in structural repair. In this paper, the compression, tensile, and flexural behavior of four epoxy grouts was investigated through laboratory tests. The stiffness of the grouts for compression, tensile, and flexural was found to be 6 GPa to 18 GPa, 4 GPa to 15 GPa, and 4 GPa to 12 GPa, respectively. The ultimate strength for all grouts was found from 62 MPa to 87 MPa, 18 MPa to 38 MPa, and 34 MPa to 62 MPa under compression, tensile, and flexural tests, respectively. The behavior of all the tested grouts is discussed. A finite element (FE) model simulating a composite-repaired pipe was developed and compared with past studies. The FE results show a good correlation with experimental test with margin of error less than 10%. By replacing the infill properties in FE model to mimic the used of different infill material for the repair, it was found that about 4–8% increment in burst pressure can be achieved. This signifies that the role of infill material is not only limited to transferring the load, but it also has the potential to increase overall performance of composite-repaired pipe.

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Figures

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Fig. 1

Material preparation

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Fig. 2

Mechanical testing of the grouts

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Fig. 3

Meshed finite element model

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Fig. 4

Stress–strain behavior of all grouts under compression loading

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Fig. 5

Failure pattern of compression sample

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Fig. 6

Stress–strain behavior of all grouts under tensile loading

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Fig. 7

Failure pattern of tensile test sample

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Fig. 8

Stress–strain behavior of all grouts under flexural loading

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Fig. 9

Failure pattern of flexural test samples

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Fig. 10

Stress versus applied pressure of benchmark model

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Fig. 11

Stress contour of finite element model

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Fig. 12

Comparison of FEA predicted stress as a function of applied internal pressure in steel pipe for benchmark model and grout A model: (a) stress-pressure curve in pipe, putty and composite, (b) stress-pressure curve in pipe, (c) stress-pressure curve in putty, and (d) stress-pressure curve in composite

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