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
09.12.01.10 - Heating Boiler - Existing Installation: Maximum Allowable Working Pressure

Universal Citation: MD Code Reg 09.12.01.10

09.12.01.10. Heating Boiler - Existing Installation: Maximum Allowable Working Pressure

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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