Section 12-903 - Applicability and scope of subtitle. - Maryland Statutes

§ 12-903. Applicability and scope of subtitle.
 

(a)  Applicability.- Except as otherwise provided in this subtitle, this subtitle applies to all boilers and pressure vessels. 

(b)  Scope.- This subtitle does not apply to: 

(1) a boiler or pressure vessel that is under federal control or regulation; 

(2) a pressure vessel that: 

(i) is used to transport or store compressed gases; 

(ii) is constructed in compliance with specifications of the U.S. Department of Transportation; and 

(iii) when charged with gas, is marked, maintained, and periodically requalified for use, as required by the regulations of the U.S. Department of Transportation; 

(3) an air tank that is located on a vehicle that is operating under the rules of other State authorities and is used for carrying passengers or freight; 

(4) an air tank that is installed on the right-of-way of a railroad and is used directly in the operation of trains; 

(5) a pressure vessel that does not exceed: 

(i) 5 cubic feet in volume and 250 psig pressure; 

(ii) 1 1/2 cubic feet in volume and 600 psig pressure; or 

(iii) an inside diameter of 6 inches with no limitation on pressure; 

(6) a pressure vessel that operates at a working pressure not exceeding 15 psig; 

(7) subject to subsection (c) of this section, a vessel that contains water under pressure, including a vessel that contains air, the compression of which serves only as a cushion, if neither of the following limitations is exceeded: 

(i) a design pressure of 300 psig; and 

(ii) a design temperature of 210 degrees Fahrenheit; 

(8) a hot water supply boiler that is equipped with a safety relief valve and is directly fired with oil, gas, or electricity if none of the following limitations is exceeded: 

(i) heat input of 200,000 BTU/hour; 

(ii) water temperature of 210 degrees Fahrenheit; and 

(iii) nominal water capacity of 120 gallons; 

(9) a mechanical device of any of the following types: 

(i) a pump; 

(ii) a compressor; 

(iii) a turbine; 

(iv) a generator; or 

(v) a hydraulic or pneumatic cylinder; or 

(10) the water-containing part of an air-conditioning or refrigeration system condenser or evaporator: 

(i) that uses halocarbon refrigerant; 

(ii) that is constructed in accordance with the requirements of ANSI/ASHRAE Standard 15 (the Safety Code for Mechanical Refrigeration) in effect at the time of construction; and 

(iii) if neither of the following limitations is exceeded: 

1. a design pressure of 300 psig; and 

2. a design temperature of 210 degrees Fahrenheit. 

(c)  Water additives.- For purposes of subsection (b)(7) of this section, water may contain additives if the ASTM flash point of the aqueous solution at atmospheric pressure is 185 degrees Fahrenheit or higher. 
 

[An. Code 1957, art. 48, §§ 168(a), 172(a), (c), (e); 2003, ch. 5, § 2; 2004, ch. 351; 2007, ch. 5, § 7.]