PEC application for corrosion detection under insulation in carbon steel pipes and tanks

Silvestre Marrodan, Carlos; TECNATOM, SA; Spain

Marrodán, C.S.; Tecnatom S.A.; Spain
Saez, B.R.; Tecnatom S.A.; Spain
Ordoño, J.O.; Ibercal Consultores S.L.U; Spain

ID: ECNDT-0497-2018
Download: PDF
Session: Oil & Gas 1
Room: H2
Date: 2018-06-11
Time: 14:10 - 14:30

Different sectors (nuclear, industrial, oil & gas, etc.) require inspections of large frames of components for the detection of corrosion. In the case of pipes and tanks, with and without heat-insulation, Tecnatom has applied PEC (pulsed eddy current) inspection technique which is able to detect the defective areas faster than conventional way; and therefore reduce inspection times and costs.

The objective of this paper is to show the development carried out for detection of generalized corrosion in carbon steel pipes from 1″ (25. 4 mm) of external diameter and thicknesses from 0.125” (3 mm) to 4” (101 mm), through insulation up to 200 mm; as well as tank walls.

As a result, the characteristics of the technology are presented in order to:
1- Determine the applicability of PEC technology to the specific case of application.
2- Identify the minimum defect detection threshold taking into account the particular conditions of the inspection (thickness, paint coating, heat-insulation, surface condition, etc.).

These results show the feasibility of implementing the electromagnetic technique PEC for a quick and qualitative inspection of pipes / tanks affected by corrosion phenomena.