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Infrared techniques for practical defect identification in bonded joints in liquefied natural gas carriers

Infrared techniques for practical defect identification in bonded joints in liquefied natural gas carriers
Infrared techniques for practical defect identification in bonded joints in liquefied natural gas carriers
A robust and reliable method for the identification of defects in adhesively bonded joints used in the membrane containment system used to store liquefied natural gas during transport on board ships is required. The adhesively bonded interface of the membrane system may contain low volume defects known as kissing defects, which are extremely difficult to detect using portable inspection techniques. A novel methodology for detecting such defects is described in the paper. To demonstrate the approach simulated kissing defects were produced in a controlled fashion in a representative secondary membrane bond using silicon grease contamination. The defects were detected using an active thermographic approach known as pulsed phase thermography (PPT) which detects subsurface defects by monitoring the effect they have on the propagation of heat through a component. Due to the low volume of kissing defects, they generally have minimal effect on the heat propagation, so the detection was made possible by application of a small load generated by application of a vacuum. The vacuum can be set-up using a reusable chamber and a standard vacuum pump and therefore is portable and can be applied on-site and in a shipyard during construction.

Pulse phase thermography, GTT Mk III, vacuum loading, liquefied natural gas carriers
0732-8818
Tighe, R.C.
bb6e82da-7adc-47e1-9fd2-664521945658
Dulieu-Barton, J.M.
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Quinn, S.
0805cab8-0ef5-4f65-9ed6-25fd5563d1a6
Tighe, R.C.
bb6e82da-7adc-47e1-9fd2-664521945658
Dulieu-Barton, J.M.
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Quinn, S.
0805cab8-0ef5-4f65-9ed6-25fd5563d1a6

Tighe, R.C., Dulieu-Barton, J.M. and Quinn, S. (2017) Infrared techniques for practical defect identification in bonded joints in liquefied natural gas carriers. Experimental Techniques. (doi:10.1007/s40799-017-0200-7).

Record type: Article

Abstract

A robust and reliable method for the identification of defects in adhesively bonded joints used in the membrane containment system used to store liquefied natural gas during transport on board ships is required. The adhesively bonded interface of the membrane system may contain low volume defects known as kissing defects, which are extremely difficult to detect using portable inspection techniques. A novel methodology for detecting such defects is described in the paper. To demonstrate the approach simulated kissing defects were produced in a controlled fashion in a representative secondary membrane bond using silicon grease contamination. The defects were detected using an active thermographic approach known as pulsed phase thermography (PPT) which detects subsurface defects by monitoring the effect they have on the propagation of heat through a component. Due to the low volume of kissing defects, they generally have minimal effect on the heat propagation, so the detection was made possible by application of a small load generated by application of a vacuum. The vacuum can be set-up using a reusable chamber and a standard vacuum pump and therefore is portable and can be applied on-site and in a shipyard during construction.

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Accepted/In Press date: 30 July 2017
e-pub ahead of print date: 28 August 2017
Keywords: Pulse phase thermography, GTT Mk III, vacuum loading, liquefied natural gas carriers

Identifiers

Local EPrints ID: 413613
URI: http://eprints.soton.ac.uk/id/eprint/413613
ISSN: 0732-8818
PURE UUID: 97d035fe-7267-41f1-a1b7-13c4e5005bbe
ORCID for S. Quinn: ORCID iD orcid.org/0000-0002-9727-5080

Catalogue record

Date deposited: 30 Aug 2017 16:31
Last modified: 07 Oct 2020 06:08

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Contributors

Author: R.C. Tighe
Author: S. Quinn ORCID iD

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