Wall Thickness Spot Checks

To verify that the wall thickness of pipes have not reduced due to either wear and tear or extended storage , it is often advisable to carry out Wall Thickness Spot Checks on casing before using.

These spot checks are done with a Ultrasonic Gauge which is calibrated with specified reference standards. The spot checks are carried out in a pre-determined pattern and the trend is recorded.

If the wall thickness values are observed to be critically low or below the nominal values , a more through Full Body Ultrasonic Inspection would be recommended to verify the integrity of the material.

API specifies a minimum criterion for the wall thickness and to use material below these ratings would most likely lead to blow-outs and expensive operational down-time.

Tuboscope Indonesia has a recommended practise of inspection of at least 12 spots along the casing. These are done in four quadrant positions and generally done at the ends and in the center.

The number of check points can be increased if there is any doubt about the integrity of the tubulars or visual inspections indicate massive pittings and / or corrosion. We have inspected under special considerations a maximum of 12 quadrant positions at a spacing of 12 inches apart.

Please contact Tuboscope , Indonesia for further information.