§753. Definitions.

Age: Period of time since date of manufacture or nearest estimate if date of manufacture is unknown.

ANSI Standards: Standards approved as American National Standards by the American National Standards Institute, Inc.

Appurtenance A device installed on and used in the normal operation of the boiler. This includes the piping between the boiler and device, but does not include piping beyond that point unless specifically required elsewhere in these Orders.

ASME: The American Society of Mechanical Engineers.

Automatic Safety Shutdown Devices: Safety controls (other than operating controls) which monitor certain essential operating conditions of a fired boiler and which will shut down the boiler in the proper sequence when any of the essential conditions vary from set limits and require the services of the attendant to place the boiler back in operation.

Automatically Controlled Boiler: A boiler equipped with devices to maintain the burner firing conditions, the pressure and/or temperature, and the water level or water content within the predetermined limits without manual manipulation.

Boiler: A fired or unfired pressure vessel used to generate steam pressure by the application of heat. (This definition is intended to include "steam generators" and "forced--circulation boilers" but excludes "unfired evaporators.") [Note definition of: Code Boiler, High Temperature Water boiler, Low Pressure Boiler, Miniature Boiler, Nuclear Boiler, Power Boiler, Secondhand Boiler].

Certificate of Competency: Certification issued by the Division to persons who have satisfactorily passed the written boiler inspector's examination prescribed by the Division.

Certified Inspector: a person who is qualified to make inspections or examinations of boilers or tanks according to the rules under which the vessel is constructed, who has an unrevoked certificate of competency issued pursuant to this part, and who is employed by any one of the following:

A county.

A city

An insurer.

An employer, for the purpose of inspecting only tanks and boilers under his jurisdiction.

Code: The applicable sections of the ASME Boiler and Pressure Vessel Code and of the ANSI Standards.

Power Boilers. Section I, 1977 edition, (except PG--39 and PW--35 for which the 1974 edition will be used).

Material Specification, Section II, 1977 edition.

Nuclear Power Plant Components, Section III, 1977 edition, Division 1 and 2 (except NB/NC/ND--3612(a)(3), for which the 1974 edition will be used).

Heating Boilers, Section IV, 1977 edition.

Pressure Vessels, Section VIII, 1977 edition.

Welding and Brazing Qualifications, Section IX, 1977 edition.

Rules for In service Inspection of Nuclear Power Plant Components, Section XI, 1977 edition.

Power Piping, ANSI B 31, 1, 1977 edition (except nonmetallic pipe such as plastic is not acceptable unless permitted by specific safety orders).

Code addenda shall become effective six months after the date of issuance unless exception to specific parts thereof are made in the interim by the Division.

Code Boiler: a boiler constructed, inspected, and stamped as required by the code.

Division: Division of Industrial Safety.

Evaporator: An apparatus, usually closed, for driving off superfluous liquid, as in concentration plants for sugar and syrup, in fruit drying, etc., or for evaporating liquid for subsequent condensation to purify it, as from salts held in solution.

Existing Installations: Boilers installed in California prior to the adoption of these orders and in compliance with the safety orders of the Division in effect at the time of installation.

External Inspection: An inspection of all visible external surfaces and appurtenance of an installed boiler or fired pressure vessel. Where practicable this inspection shall be made with the boiler in operation to permit the inspector to witness the operation of the controls.

Field Inspection: An inspection of an installed boiler or fired pressure vessel.

Fired Pressure Vessel: A metallic vessel other than a boiler in which vapor pressure is generated in excess of 15 psi by direct firing with a solid, liquid, or gaseous fuel or by electric heating elements. (This does not apply to a coil or tubular section in which a fluid or other product is being continuously circulated by means of a pump or other mechanical device, provided the pipes or tubes do not exceed 6--inch size.)

Full Safety Pilot Control: A control that will shut off the fuel to the main burner and to the pilot burner and require manual resetting if:

The pilot burner flame should be extinguished, or

In the case of spark ignition, the main burner fails to light after 1 recycle of operation of the ignition mechanism.

High Temperature Water Boiler: A fired or unfired pressure vessel used to heat water to temperatures above 212° F. At pressure exceeding 160 psi or to temperatures exceeding 250° F regardless of pressure.

Internal Inspection: Inspection of all accessible internal and external surfaces of a boiler or fired pressure vessel and its appurtenances.

Low--pressure Boiler: A boiler which does not:

Operate at steam pressure or with steam safety valve settings exceeding 15 psi (low--pressure steam boiler), or

Operate at water pressure exceeding 160 psi or water temperatures exceeding 250° F (hot water heating boiler).

This definition is not intended to include domestic type water heaters provided all of the following are complied with:

The heater does not have more than 120--gallon water capacity.

The heater is used only for heating service water.

The operating control on all automatically controlled heaters is installed by the manufacturer and is of a type that cannot be regulated to increase the water temperature at the top of the heater to more than 200° F.

A non--adjustable control is installed on all automatically controlled heaters by the manufacturer and set to shut off the heat input when the temperature at the top of the heater is 210° F or less. This control and the necessary fuel valve, switch, etc., shall be separate from the operating mechanisms required in (C) above.

Automatically controlled gas or oil fired heaters shall have a safety pilot mechanism installed by the manufacturer and so arranged that fuel will be shut off to both the main burner and pilot burner in case of failure of the pilot burner flame or of the spark igniter.

The heater is approved by the American Gas Association or other testing laboratory acceptable to the American National Standards Institute.

The heater is protected against over--pressure than the maximum allowable working pressure of the heater and having a relieving capacity in BTU/hr at least equal to the burner output.

Coil--type swimming pool heaters at places of employment rated at or below 400,000 BTU/hr input need not be considered boilers provided all of the following conditions are complied with:

They are used to heat pool water to a maximum temperature of 140° F, with a maximum pressure stamping of 150 psi.

The inside diameter of the tubes shall not exceed 1/8".

The water volume within the casing does not exceed 6 gallons.

Pool heaters with 200,000 BTU/hr input and less need not be ASME Code, but shall be built to good engineering practice, and have a minimum factor of safety of 4.

They shall have an ASME Code safety valve rated at the full BTU output, and set at or below the stamped maximum allowable working pressure of the heater.

The maximum voltage of the control circuit shall be 120 volts.

The burner shall have a safety pilot mechanism installed by the manufacturer that will shut off the fuel to both the main burner and pilot burner in case of failure of the pilot burner or of the spark ignitor. The maximum time until the fuel valve is fully closed shall be 90 seconds for burners not exceeding 400,000 BTU/hr input.

There shall be a flow switch or low water pressure switch installed by the manufacturer within the heater casing to monitor flow through the coil.

There shall be a high temperature limit switch set below the boiling point at atmospheric pressure. This is in addition to the operating temperature control, set at 140° F.

There shall be two main burner fuel valves piped in series, or a single fuel valve having two seats.

Coil--type steam vapor cleaners need not be considered as boilers provided all of the following conditions are complied with:

The larges nominal pipe or tubing size is 3/4," and has no drums or headers attached. They shall be built to good engineering practice with a factor of safety of at least 4.

The nominal water containing capacity does not exceed 6 gallons.

A non--adjustable high limit temperature control shall be set to operate at or below 350oF.

Steam is not generated within the coil.

A safety valve set at or below the stamped maximum allowable working pressure, with relief capacity at least equal to the BTU output of the burner, shall be installed near the outlet.

The burner shall have a safety pilot mechanism installed by the manufacturer that will shut off the fuel to both the main burner and pilot burner in case of failure of the pilot burner or of the spark ignitor. The maximum time until the fuel valve is fully closed shall be 90 seconds for burners not exceeding 400,000 BTU/hr input.

Miniature Boiler: A boiler which does not exceed any of the following limits:

16 inches inside diameter of shell.

5 cubic feet gross volume, exclusive of casing and insulation. (This volume includes the total volume of the steam and water containing parts of the boiler plus the volume of the combustion space and gas passages up to the point of attachment of the smokestack or chimney breeching.)

20 square feet water heating surface.

100 psi maximum allowable working pressures.

National Board: The National Board of Boiler and Pressure Vessel Inspectors.

New Installations: Boilers and fired pressure vessels installed or reinstalled after the effective date of these Orders.

Nuclear Boiler: A device consisting of a vessel or system of vessels in which nuclear fuel is present and a nuclear chain reaction may take place or in which the reactor coolant is circulated for the purpose of heating a fluid for generating useful energy. Such nuclear boiler shall include the interconnecting piping up to and including the required valve or valves needed to isolate the vessel or system of vessels.

Oil Field Recovery Heater: A forced--circulation, once--through, water tube steam generator, used only in oil field thermal recovery operations, having no fired pressure parts larger than 4--inch pipe size and no other pressure part larger than 6--inch pipe size.

Power Boiler: Steam boiler operated at pressure exceeding 15 psi.

Proved Pilot: a device that will not permit the fuel valve to the main burner to open until a proper source of ignition is established to light the main burner.

Psi: Pounds per square inch gage.

Qualified Inspector: Either a certified inspector or qualified safety engineer.

Qualified Safety Engineer: A person who is qualified to make inspections or examination of boilers or tanks according to the rules under which the vessel is constructed and who holds a valid certificate of competency issued by the Division.

Relief Valve: An automatic pressure relieving device actuated by the static pressure upstream of such device which opens further with the increase in pressure over the opening pressure. It is used primarily for liquid service.

Resale Inspection: The inspection of any used boiler to determine its maximum allowable working pressure when reinstalled in accordance with these Orders.

Safety Relief Valve: An automatic pressure actuated relieving device suitable for use either as a safety valved or relief valved, depending on application.

Safety Valve: An automatic pressure relieving device actuated by the static pressure upstream of such device and characterized by full opening pop action. It is used for gas or vapor service.

Secondhand Boiler: A boiler that has changed both ownership and location.

Shop Inspection: Inspection of boilers and fired pressure vessels in a fabricator's shop, or at the jobsite during erection, as required by the Code.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.

HISTORY

1. Repealer of subsection (e--2) and amendment of subsection (s--4) filed 8--12--76; effective thirtieth day thereafter (Register 76, No. 33). for prior history, see Register 75, No.6

2. Amendment filed 6--15--79; effective thirtieth day thereafter (Register 79, No. 24).

3. Amendment filed 5--28--81; effective thirtieth day thereafter (Register 81, No. 22).

4. Editorial correction of printing error in Internal Inspection (Register 92, No. 29).

Go Back to Article 2 Table of Contents