Nevada Administrative Code
Chapter 455C - Boilers, Elevators and Pressure Vessels
BOILERS AND PRESSURE VESSELS
Boilers
Section 455C.240 - Period of operation for nonstandard boiler

1. A boiler having a longitudinal joint that is other than lap-riveted may be continued in operation beyond 30 years at the working pressure determined by the formula set forth in NAC 455C.242 if it is thoroughly inspected, by an internal inspection and an external inspection, and is given a hydrostatic pressure test of 1 1/2 times the maximum allowable working pressure and held for at least 30 minutes, during which no distress or leakage develops.

2. The maximum age at which any nonstandard boiler having longitudinal joints that are lap-riveted and operating at a pressure in excess of 50 PSIG may be operated is 20 years. If such a boiler is removed from its existing setting, it may not be reinstalled for a pressure that is in excess of 15 PSIG.