Ultrasonic NDE of thick polyurethane flexible riser stiffener material. Issue 4 (2nd October 2017)

• Record Type: Journal Article
• Authors: Mohamed, Ikhsan; Hutchins, David; Davis, Lee; Laureti, Stefano; Ricci, Marco
• Is Part Of: Nondestructive testing and evaluation. Volume 32:Issue 4(2017)
• Page Start: 343
• Page End: 362
• Publication Date: 2017-10-02
• Subjects: Pulse compression -- cross correlation -- piezocomposite -- polyurethane -- SAFT; Non-destructive testing -- Periodicals; 620.112705
• DOI: 10.1080/10589759.2016.1241253
• Languages: English
• ISSNs: 1058-9759

Abstract

Abstract: Ultrasonic signals at frequencies below 1 MHz have been used for the NDE of thick polymer samples. Coded signals such as chirps and bipolar Golay codes, together with pulse compression and signal processing, have been used to penetrate into thick sections of attenuating polypropylene riser stiffener material, using piezocomposite transducers to provide the required bandwidth. It is shown that this approach can be used to detect manufacturing defects such as air bubbles in flexible riser stiffeners, which might compromise their performance in the offshore oil and gas environments.