South Dakota Administrative Rules
Title 61 - Department of Public Safety
Article 61:08 - Boilers
Chapter 61:08:09 - Historic power boilers
Section 61:08:09:29 - Ultrasonic examination for thickness determination

Ultrasonic examination for thickness determination may be made using the pulse-echo technique. Ultrasonic examination provides indications of surface and subsurface discontinuities. If an ultrasonic thickness reading is below a desired value, the area around that reading must be examined as follows:

Using the low reading point as the center, superimpose an 8-inch point as the center, superimpose an 8-inch square on the area, and take 20 readings spaced on 2-inch centers on the perimeter and within the square. The average of these 20 readings is used as the minimum boiler thickness in the 8-inch square area.

General Authority: SDCL 34-29A-14.1.

Law Implemented: SDCL 34-29A-14.1.