61:08:09:08Internal inspection -- Evidence of overheating.

The inspector shall determine whether or not any part of the boiler or the boiler tubes exposed to the fire have been deformed by bulging or blistering. If a bulge or blister is of sufficient size to seriously weaken the tube or plate, especially when there is evidence of leakage, the damaged area must be repaired before the boiler is fired again. If the bulged area is not extensive, the bulge may be repaired by installing a staybolt in the center of the bulged area.

Source: 23 SDR 139, effective March 5, 1997.