Stress distribution analysis of composite repair with carbon nanotubes reinforced putty for damaged steel pipeline

Arifin, Hanis Hazirah and Zardasti, Libriati and Lim, Kar Sing and Md. Noor, Norhazilan and Yahaya, Nordin and Mazlan, Ain Naadia and Mohd. Sam, Abdul Rahman (2021) Stress distribution analysis of composite repair with carbon nanotubes reinforced putty for damaged steel pipeline. International Journal of Pressure Vessels and Piping, 194, Part A (104537). pp. 1-12. ISSN 0308-0161

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Abstract

Composite pipeline repair systems involving infill material and composite wrapper are a common method of enhancing the integrity of damaged oil and gas pipelines. Composite wrappers can be theoretically optimised by minimising the layers of wrapper whilst reinforcing the infill material; i.e., putty. Integrating nanomaterial into putty to enhance its strength is a novel approach to provide secondary layer protection of damaged pipelines. A finite element model simulating a composite repaired pipe was developed to investigate the influence of reinforced Carbon Nanotubes putty on the system's overall repair performance and behaviour. The result was verified with a previous experimental hydrostatic burst pressure test and industrial standard resulting in less than a 15% error margin. The result shows the damaged artificial pipe segment filled with two different putties, namely Grout A and Grout B, ruptured at 32.22 MPa and 32.93 MPa, respectively. The reinforced putty improved the load-bearing capacity of the repaired pipe by a marginal increment of 2.2%. It demonstrated a better load-transfer and load-sharing mechanism than the common composite repair system. The recorded burst failure of the repaired pipe was less abrupt, thus minimising the sudden rupture of the pipeline by acting as a secondary layer of protection in the event of a composite wrapper failure.

Item Type:	Article
Additional Information:	Indexed by Scopus
Uncontrolled Keywords:	Load-transfer mechanism; Reinforced putty; Carbon nanotubes; Finite element analysis; Repaired pipeline; Burst failure
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Faculty/Division:	College of Engineering
Depositing User:	Mrs Norsaini Abdul Samat
Date Deposited:	29 Dec 2021 02:12
Last Modified:	29 Dec 2021 02:12
URI:	http://umpir.ump.edu.my/id/eprint/32695
Download Statistic:	View Download Statistics

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