Code of Massachusetts Regulations › 248 CMR - BOARD OF STATE EXAMINERS OF PLUMBERS AND GAS FITTERS › Title 248 CMR 7.00 - Large Gas Utilization Equipment › Section 7.01 - Definitions

Current through Register 1525, July 5, 2024
Air Shutter
. An adjustable device for
				varying the size of the air inlet or inlets regulating primary or secondary
				air.
Boiler
.
See
NFPA 85,
				subsection 3.3.20.
Breeching
. (
See
Chimney Connector.)
Burner
. A device for the final
				conveyance of the gas, or a mixture of gas and air to the combustion
				zone.
(a)
Injection (Bunsen) Type Burner
. A
				burner employing the energy of a jet of gas to inject air for combustion into
				the burner and mix it with the gas.
(b)
Atmospheric Injection Type Burner
.
				A burner in which the air at atmospheric pressure is injected into the burner
				by a jet of gas.
(c)
Luminous or Yellow Flame Burner
. A
				burner in which secondary air only is depended on for combustion of the gas.
(d)
Power Burner
. A burner in which
				either gas or air or both are supplied at pressures exceeding, for gas, the
				line pressure and, for air, atmospheric pressure; this added pressure being
				applied at the burner. A burner for which air for combustion is supplied by a
				fan ahead of the appliance is commonly designated as a forced draft
				burner.
(e)
Premixing Burner
. A power burner in
				which all or nearly all of the air for combustion is mixed with the gas as
				primary air.
(f)
Induced Draft Burner
. A burner
				which depends on the draft induced by a fan beyond the appliance for its proper
				operation.
(g)
Pressure Burner
. A burner which is
				supplied with an air-gas mixture under pressure (typically from 0.5 to 14.0
				inches of water and occasionally higher).
Burner Head
. That portion of a burner
				beyond the outlet end of the mixer tube which contains the ports.
Burner, Automatically Lighted
. One
				where fuel to the main burner is normally turned on and ignited
				automatically.
Burner, Manually Lighted
. One where
				fuel to the main burner is turned on only by hand and ignited under
				supervision.
Chimney
. A vertical shaft enclosing
				one or more flues for conveying flue gases to the outside atmosphere.
(a)
Factory-built Chimney
. A listed
				chimney.
(b)
Masonry Chimney
. A chimney of solid
				masonry units, bricks, stones, listed masonry chimney units or reinforced
				concrete, lined with suitable flue liners.
(c)
Metal Chimney
. A field-constructed
				chimney of metal.
Chimney Connector
. The pipe which
				connects a fuel-burning appliance to a chimney.
Combustion
. The rapid oxidation of
				fuel gases accompanied by the production of heat or heat and light.
Combustion Control
. A control which
				automatically regulates the firing rate at predetermined air-fuel ratios in
				accordance with load demand.
(a)
High-low Firing
. The action of a
				combustion control which positions the air and fuel supply for low-fire and for
				high-fire in accordance with load demand.
(b)
Modulating
. The action of a
				combustion control which gradually varies the air and fuel supplies within
				limits in accordance with load demand.
Combustion (Input) Control Valve
. An
				automatic gas-control valve for regulating equipment input.
Combustion Products
. Constituents
				resulting from the combustion of a fuel gas with the oxygen of the air,
				including the inerts, but excluding excess air.
Condensate
. The liquid which separates
				from a gas (including flue gases) due to a reduction in temperature.
Controls
. Devices designed to regulate
				gas, air, water or electrical supply equipment. These may be manual,
				semi-manual, semi-automatic or automatic.
Control, Limit
. An automatic control
				responsive to changes in liquid level; in fuel, steam or air pressure; in air,
				gas or liquid flow; or in temperature; for limiting the operation of the
				controlled equipment.
Control, Primary Safety
. A control
				responsive directly to flame properties; sensing the presence of flame and
				causing fuel to be shut off in the event of ignition or flame failure requiring
				manual reset.
Control, Safety
. Automatic controls
				and interlocks (including relays, switches, and other auxiliary equipment used
				in conjunction therewith to form a safety control system which are intended to
				prevent unsafe operation of the controlled equipment).
Damper
. A valve or plate for
				controlling draft or flow of the flue gases. A damper is generally considered
				as being located on the downstream side or the combustion chamber usually in a
				flue passage of the appliance or in the chimney or vent connector.
Damper, Automatically Operated
. A
				damper operated by an automatic control.
Damper, Manually Operated
. An
				adjustable damper manually set and locked in the desired position.
Draft Regulator, Barometric
. A device
				which functions to maintain a desired draft in the appliance by automatically
				reducing the chimney draft to the desired value.
Equipment
. Any gas utilization
				equipment having inputs of more then 400,000 BTU's per hour per combustion
				chamber. This includes, but is not limited to, steam boilers, hot water
				boilers, water heaters, generators, and other similar gas utilization
				equipment.
Flame Safeguard
. (
See
Control, Primary Safety.)
Flue Gases
. Products of combustion and
				excess air.
Interlock
. A device to prove the
				physical state of a required condition, and to furnish that proof to the
				primary safety control circuit.
Labeled
. Equipment or materials to
				which has been attached a label of a nationally recognized testing laboratory
				that maintains periodic inspection of production of labeled equipment or
				materials and by whose labeling is indicated compliance with nationally
				recognized standards or has been tested and found safe for use in a specified
				manner.
Listed
. Equipment or materials
				included in a list published by a nationally recognized testing laboratory that
				maintains periodic inspections of production of listed equipment or materials
				and whose listing states either that the equipment or material meets nationally
				recognized standards or has been tested and found safe for use in a specified
				manner.
Low-fire Start, Proven
. The firing of
				a burner with fuel and combustion air controls interlocked in a low-fire
				position to provide safe operating conditions during light off.
Lubricated Plug-type Valve
. A valve of
				the plug-and-barrel type designed for maintaining a lubricant between the
				bearing surfaces.
Main Burner Flame-establishing Period
.
				The length of time the main burner flue safety shutoff valves are permitted to
				be open before the flame sensing device is required to supervise the main
				burner flame.
Optimum Air-fuel Ratio
. A ratio of air
				to fuel going to the furnace which will provide complete combustion of the fuel
				with sufficient range of excess air to maintain a stable flame envelope.
Pilot
. A flame which is utilized to
				ignite the gas at the main burner or burners.
Pilot, Continuous
. A pilot that burns
				without turndown throughout the entire time the burner is in service, whether
				the main burner is firing or not.
Pilot, Expanding
. A continuously
				burning pilot that is automatically expanded so as to reliably ignite the main
				burner. This pilot may be turned down at the end of the main burner
				flame-establishing period.
Pilot Flame-establishing Period
. The
				length of time fuel is permitted to be delivered to a proved pilot before the
				flame sensing device is required to detect pilot flame.
Pilot, Intermittent
. A pilot which is
				automatically lighted each time there is a call for heat. It burns during the
				entire period that the main burner is firing.
Pilot Interrupted
. A pilot which is
				automatically lighted each time there is a call for heat. The pilot fuel is cut
				off automatically at the end of the main burner flame-establishing
				period.
Pilot, Proved
. A pilot flame
				supervised by a primary safety control.
Purge
. To free a gas conduit of air or
				gas, or a mixture of air or gas.
Regulator, Gas Pressure
. An automatic
				gas pressure reducing device for the purpose of maintaining a uniform gas
				supply pressure.
Safety Shutdown
. The action of
				shutting off all fuel and ignition energy to the appliance by means of a safety
				control or controls such that restart cannot be accomplished without manual
				reset.
Safety Shutoff Valve
. A gas-control
				valve that is automatically closed by the safety control system or by an
				emergency device. The valve may be of the automatically or manually opened
				type.
Throttling
. (
See
"Modulating" under Combustion Control.)
Trial-for-ignition Period
.
				(
See
Main Burner Flame-establishing Period.)
Zero Governor
. A regulating device
				which is normally adjusted to deliver gas at atmospheric pressure within its
				flow rating.