Ch. 5

2003 LAWS OF MARYLAND

(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.

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