Verkade N.D.T Services GmbH is founded by J.C Verkade in 1991, located in Meppen-Versen, Germany. Verkade is working in 15 countries in Europe, Africa, the Middle East and South East Asia.
In service corrosion at pipe supports had been an area of concern in a lot of industry, oil & gas being on of them. Visual inspection can provide an indication of corrosion (e.g. product build up, rust staining etc) but is hampered by the lack of access to the critical areas. This has lead to increased interest in the use of NDT methods for inspecting corrosion underneath pipe supports, in addition to conventional visual inspection.
The main aim of this inspection was to assess how accurately different NDT inspection techniques could detect and measure the remaining wall thickness of corrosion under the pipe supports.
This common form of outside corrosion occurs, when pipeline are lying on steel or concrete, or are hanging in clamps. Because of temperature changes, vibration etc, the piping is moving over the support which can cause damaging of the coating of the piping. In combination with water, corrosion will occur, even more when the facility is in a marine environment.
When investigating supports, sound beam is sent in circumferential direction of the pipe while sound beam in longitudinal direction is used for investigation on pipe clamps. Different set-ups are used for various configuration and inspection of pipe supports.
Inspection can be made until a surface temperature of 60°C. It is possible to inspect pipes with diameters from 2” and above, when the pipe is lying of supports (depending on surface condition and permeability of the coating).