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Wall Thickness: How Low Can You Go?

Monday, October 13, 2014

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Measuring wall thickness—a key element in assessing the structural integrity of steel tanks and piping—gets an expert assist in the latest PaintSquare Video Learning Center installment.

"Wall Thickness" is the 15th video in the instructional series, which covers multiple aspects of protective coatings work.

KTA Wall Thickness
Images: KTA-Tator Inc.

"Wall Thickness" is the 15th title in the PaintSquare Video Learning Center Series.

Created by KTA-Tator Inc., the video learning series covers a wide range of topics in protective coatings work, from quality-control and health and safety, to basics on the proper use of coatings instruments.

From Lead Detection to Ventilation

Previous titles in the video series include:

PaintSquare Video Learning Center

The series of short video tutorials includes "Corrosion Assessment."

Future topics in the series include steel surfaces and moisture testing.

Each installment is available free in the PaintSquare Video Learning Center.

Avoiding the Void

In "Wall Thickness" (2:21), KTA's Ken Trimber discusses how section loss of a metallic substrate is a significant factor in determining whether to repair or replace a coating system—and, more important, whether repairs to the substrate itself are required.

"Section loss of a structural member, pipe wall or other critical support due to corrosion can have catastrophic consequences if undetected," Trimber warns.

Typically, he notes, there are two methods to measuring wall thickness: the pit depth gage or the ultrasonic wall thickness gage.

Pit depth is measured from one side and then compared to original thickness of steel. If section loss is not in the form of pitting, or is occurring on the opposite side of the wall, then an ultrasonic gage is used. These measurements may or may not include the coating thickness.

PaintSquare Video Learning Center

"Section loss of a structural member, pipe wall or other critical support due to corrosion can have catastrophic consequences if undetected," Trimber warns.

According to Trimber, no ASTM standard governs the use of wall thickness gages or frequency of measurement.

Watch "Wall Thickness."


Tagged categories: Condition assessment; Education; KTA-Tator; North America; PaintSquare; Pipeline; Quality Control; Quality control; Tanks and vessels; Thickness gauge; Video; Walls

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