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. 51, No. 19, September 20, 2024
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.
Disclaimer: These regulations may not be the most recent version. Maryland may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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