Okla. Stat. tit. 40, § 40-141.1

This act shall be known and may be cited as the "Boiler and

Pressure Vessel Safety Act", and, except as otherwise herein

provided, shall apply to all boilers and pressure vessels. For the

purpose of this act, the following definitions apply:

1. "Boiler" means a closed vessel in which water is heated,

steam is generated, steam is superheated, or any combination

thereof, under pressure or vacuum, for external use to itself, by

the direct application of heat. The term "boiler" includes fired

units for heating or vaporizing liquids other than water where these

units are separate from processing systems and complete within

themselves:

a. "power boiler" means a boiler in which steam or other

vapor is generated at a pressure of more than fifteen

(15) pounds per square inch gauge, or as further

defined in American Society of Mechanical Engineers

Boiler and Pressure Vessel Code Section I,

b. "high-temperature water boiler" means a water boiler

intended for operation at pressures in excess of one

hundred sixty (160) pounds per square inch gauge; or

temperatures in excess of two hundred fifty degrees

Fahrenheit (250° F), or as further defined in

American Society of Mechanical Engineers Boiler and

Pressure Vessel Code Section I,

c. "low pressure steam boiler" means a steam boiler

operating at pressures not exceeding fifteen (15)

pounds per square inch gauge, or as further defined

in American Society of Mechanical Engineers Boiler

and Pressure Vessel Code Section IV,

d. "hot water heating boiler" means a heating boiler

operating at pressures not exceeding one hundred

sixty (160) pounds per square inch gauge - one

thousand one hundred three (1,103) kilopascals and/or

temperatures not exceeding two hundred fifty degrees

Fahrenheit (250° F), one hundred twenty-one degrees

Celsius (121° C), at or near the boiler outlet, or as

further defined in American Society of Mechanical

Engineers Boiler and Pressure Vessel Code Section IV,

e. "hot water supply boiler" means a supply boiler

operating at pressures not exceeding one hundred

sixty (160) pounds per square inch gauge - one

thousand one hundred three (1,103) kilopascals and/or

Oklahoma Statutes - Title 40. Labor Page 209

temperatures not exceeding two hundred fifty degrees

Fahrenheit (250° F), one hundred twenty-one degrees

Celsius (121° C), at or near the boiler outlet, or as

further defined in American Society of Mechanical

Engineers Boiler and Pressure Vessel Code Section IV,

and

f. "hot water supply heater" means a closed vessel in

which water is heated by the combustion of fuels,

electricity or any other source and withdrawn for use

external to the system at pressures not exceeding one

hundred sixty (160) pounds per square inch gauge and

shall include all controls and devices necessary to

prevent water temperature from exceeding two hundred

ten degrees Fahrenheit (210° F), ninety-eight point

nine degrees Celsius (98.9°C);

2. "Pressure vessel" means a vessel in which pressure is

obtained from an external source or by the application of heat other

than those vessels defined in paragraph 1 of this section or as

further defined in American Society of Mechanical Engineers Boiler

and Pressure Vessel Code Section VIII, Division I;

3. "Certificate of operation" means an annual certificate,

unless otherwise provided for in this act, issued by the

Commissioner of Labor permitting the operation of a boiler or

pressure vessel which has been inspected as provided for in this

act;

4. "Steam lines" means piping of welded construction in which

steam is contained and/or transported at a pressure in excess of

fifteen (15) pounds per square inch gauge; and

5. "Commissioner" means the Commissioner of Labor or the

Commissioner’s duly authorized representative.