Corrosion Under Pipe Support
Why Corrosion Under Pipe Support Happen?
A common form of outside corrosion occurs, when pipelines are lying on steel or concrete, or are hanging in clamps. Because of temperature changes, the pipeline is moving over the support, which can cause damaging of the coating of the pipeline. In combination with water, corrosion will occur. The method of lifting and inspection during process is not acceptable because of the risks which are involved.
Quantitative Evaluation
In 1997 we received the question if it was possible to detect corrosion in piping lying on supports.
In 2002 our procedure was operational and we could offer this service to our clients. Nowadays we test on a yearly base worldwide 30.000 supporting points.
Types of Pipe Support
I-rod
Trunnion
Clamp
Dummy Support
I-Beam
U-Bolt
How it works?
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.
If there is a loss of wall thickness, the sound beam will be dispersed and less sound will
be captured hence lowering the UT signal on the screen.