Code of Maryland Regulations (Last Updated: April 6, 2021) |
Title 09. Maryland Department of Labor |
Subtitle 12. DIVISION OF LABOR AND INDUSTRY |
Chapter 09.12.01. Board of Boiler Rules |
Sec. 09.12.01.20. Power Boiler — Existing Installation: Age Limit
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A. Nonstandard Construction.
(1) Except as otherwise provided in this regulation, the age limit of a boiler of nonstandard construction installed before the Act became effective shall be 30 years.
(2) A boiler of nonstandard construction installed before the Act became effective, not having a lap-riveted longitudinal joint, may continue to operate for more than 30 years without reduction in working pressure after a:
(a) Thorough internal and external inspection; and
(b) Hydrostatic pressure test at 1-1/2 times the allowable working pressure, held for a period of at least 30 minutes, during which no distress or leakage develops.
(3) A boiler having a lap-riveted longitudinal joint, which operates at a pressure greater than 50 PSI, has an age limit of 20 years.
(4) The chief boiler inspector may authorize a reasonable time for replacement, not to exceed 1 year.
B. Standard Construction.
(1) The age limit of a boiler of standard construction installed before July 1, 1969 shall be determined by a:
(a) Thorough internal and external inspection; and
(b) Hydrostatic pressure test conducted at 1-1/2 times the maximum allowable working pressure, with water temperature between 70°F and 140°F and not less than the nil ductility temperature of the material.
(2) A boiler that exhibits no distress or leakage under test conditions may continue in operation at the same working pressure.
C. The shell or drum of a boiler having a lap-seam crack along a longitudinal riveted joint in either a butt seam or a lap joint may not be used under steam pressure.