CFR /  Title 46  /  Part 61  /  Sec. 61.05-20 Boiler safety valves.

Each safety valve for a drum, superheater, or reheater of a boiler shall be tested at the interval specified by table 61.05-10. [CGD 95-028, 62 FR 51202, Sept. 30, 1997]

Subpart 61.10_Tests and Inspections of Pressure Vessels