Development of Acceptance Criteria for the Phased Array Examination Method for Steel Components with Small Wall Thickness

Wassink, Casper; CWSID; Netherlands

Martens, W.; CWSID; Netherlands
Ton, L.; CWSID; Netherlands
Wassink, C.; CWSID; Netherlands
Verkooijen, J.; CWSID; Netherlands
Vertregt, V.; CWSID; Netherlands

ID: ECNDT-0208-2018
Session: Qualification and standards 1
Room: J1
Date: 2018-06-14
Time: 13:30 - 13:50

Since the introduction of small portable Phased Array (PA) ultrasonic systems, the replacement of radiography by ultrasonic testing for testing of welds in thin walled steel components has been a promising prospect. PA differentiates itself from Radiographic Testing (RT), as it does not involve ionising radiation, improving safe working conditions. Plot clearance is usually used to mitigate radiation risks for RT, preventing other activities. Especially in large construction projects containing a large number of weldments such as heat exchangers, boilers and piping, the potential for improving project efficiency is considerable, as plot clearance is not necessary when using PA
Over the past years, several Non-Destructive Testing (NDT) equipment suppliers have developed mechanised systems that enable the application of PA testing of welds in thin-wall (3.2 – 8 mm) ferritic steel. During a preceding KINT project, a PA method description was developed, which has been accepted as the base document for an ISO Standard (ISO 20601:2017).
The paper will describe the subsequent project for developing acceptance criteria resulting in an ISO Standard, as well as the results of the first two completed project phases A and B. Phase A is a literature survey of 15 existing reports related to PA ultrasonic testing of thin walled material. The international collaboration with similar project in other European countries will as be described. Phase B is a review of qualification studies performed in the Netherlands, as well as an analysis of field work already performed.
The project was performed by the research and development foundation (SKOP) of the Dutch society for Quality Surveillance, Inspection and Non-Destructive Testing (KINT). The project is sponsored by a group of 23 companies including all major Dutch NDT service providers, a consortium of power plants, and a number of leading international oil, gas and chemical companies.