Code of Maryland Regulations
Title 09 - MARYLAND DEPARTMENT OF LABOR
Subtitle 12 - DIVISION OF LABOR AND INDUSTRY
Chapter 09.12.01 - Board of Boiler Rules
Section 09.12.01.10 - Heating Boiler - Existing Installation: Maximum Allowable Working Pressure
Universal Citation: MD Code Reg 09.12.01.10
Current through Register Vol. 50, No. 25, December 15, 2023
A. The maximum allowable working pressure on a standard boiler may not exceed the pressure stamped or cast by the manufacturer on:
(1) The boiler; or
(2) A plate secured to the boiler.
B. The maximum allowable working pressure on:
(1) The shell of a nonstandard
riveted heating boiler shall be determined in accordance with Regulation .22 of
this chapter, except that the maximum allowable working pressure on a:
(a) Steam heating boiler may not exceed 15
PSIG; and
(b) Hot water boiler may
not exceed:
(i) 160 PSIG, or
(ii) 250°F.
(2) A nonstandard steel or wrought
iron heating boiler of welded construction:
(a) May not exceed 15 PSIG for steam;
and
(b) For service other than
steam, shall be calculated in accordance with the ASME Code, Section
IV.
(3) A nonstandard
boiler composed principally of cast iron, or having a cast iron shell or heads
and steel or wrought iron tubes, may not exceed:
(a) 15 PSIG for steam service; and
(b) 30 PSIG for hot water service.
Regulations .10 adopted effective June 1, 1989 (16:10 Md. R. 1106)
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