(b) Temporary combustion devices using
liquefied gas.
(1) General.
(i) After June 1, 1972 all combustion devices
used for temporary heating which use liquefied gas as fuel shall be
approved.
(ii) Liquefied gas used
as fuel in temporary combustion devices shall contain an agent which will give
such gas a distinctive and detectable odor.
(iii) Areas in which temporary combustion
devices fueled by liquefied gas are used shall have legible warning signs
affixed to every entrance to such areas. Such signs shall be conspicuously
located so as to be readily visible to persons approaching such areas. Such
signs shall bear the words, "DANGER-- FLAMMABLE GAS" in letters at least four
inches in height on a contrasting background.
(iv) Temporary combustion devices
manufactured after June 1, 1972 shall be provided with automatic cut-off
devices which will shut off the fuel supply in the event of flame failure. Such
cut-off devices shall be installed at the burners.
(v) A designated person shall be in
attendance on the job site at all times when liquefied gas combustion devices
are operating.
(2)
Liquefied gas cylinders and containers.
(i)
Cylinders and containers of liquefied gas used as fuel for the heating of
construction shanties, sanitary facilities, field offices or other temporary
buildings or structures on construction, demolition or excavation sites shall
be located outside such buildings or other structures.
Exception:Temporary combustion devices specifically
designed to be attached to gas cylinders or containers.
(ii) The use of cylinders or containers of
liquefied gas having stored capacities in excess of 1,000 pounds each is
prohibited in the interior of any building or other structure. Where such
capacity cylinders or containers are used, they shall be stored in central
areas outside of any building or other structure. Such liquefied gas supply
shall be located a distance of at least 25 feet from any building or other
structure or from any combustible material and shall be protected from the sun
and high temperatures.
(iii)
Liquefied gas cylinders or containers not in use shall be stored or placed at a
distance of at least 25 feet from any building or other structures or from any
combustible material and shall be protected from the sun and high temperatures.
Each storage location shall be provided with at least one approved portable
fire extinguisher of a suitable type.
(iv) Liquefied gas cylinders or containers
shall be raised or lowered only in suitable cradles. The use of ordinary slings
for such purpose is prohibited. No more than two cylinders or containers shall
be handled in a cradle at one time.
(v) Liquefied gas cylinders or containers
shall not be dropped or thrown from any height.
(vi) Liquefied gas cylinders or containers,
whether full, partially full or empty, shall be securely fastened in place in
an upright position and protected from any damage. Such cylinders shall not be
supported in the areas of the valves or valve protectors.
Exception:In operations where such cylinders must be
placed in a horizontal position, as in the extraction of liquid.
(vii) The control valve of any
liquefied gas cylinder shall be located at the domed end of such cylinder. When
not in use, such control valve shall be protected by its ring guard. A key,
wrench or hand wheel shall be maintained on the spindle of every liquefied gas
cylinder or container at all times during use. The use of a control valve at
the combustion device as a sole means of turning off the fuel supply is
prohibited.
(viii) Each liquefied
gas cylinder or container shall be provided with a pressure regulator or an
automatic pressure reducing device. Such regulator or reducing device shall be
located between the cylinder or container and the combustion device or
distribution manifold.
(ix) Valves,
fittings, piping and other accessories connected to a liquefied gas cylinder or
between a cylinder and a pressure reducing device shall be designed to
withstand the maximum hydrostatic cylinder working pressure.
(3) Central station distribution.
Where temporary combustion devices use liquefied gas supplied from a central
station, the liquefied gas distribution shall be in accordance with the
following:
(i) Liquefied gas shall be
distributed throughout the building or other structure from the cylinder or
container area to the combustion devices in the gaseous state by means of
flexible or rigid piping suitable for such use at a pressure not exceeding 20
pounds per square inch gage.
(ii)
Such flexible or rigid branch piping shall extend to a point not more than 10
feet nor less than six feet from any temporary combustion device.
(iii) Such piping shall be provided with
shut-off valves at each floor or equivalent level take-off from the riser, at
each branch take-off and at each final take-off.
(iv) The connections between the flexible or
rigid piping and the temporary combustion devices shall be by means of armored
flexible hose. Such hose shall be provided with metal screw connectors which
shall be maintained in a tight condition.
(4) Use of individual liquefied gas cylinders
or containers. Where each temporary combustion device is supplied with
liquefied gas from an individual cylinder or container and a central station
distribution system is not used, such use shall be in accordance with the
following:
(i) Each liquefied gas cylinder or
container shall be securely fastened in an upright position and protected from
any damage. Such cylinder shall not be supported in the area of the valve or
valve protector.
(ii) Each
liquefied gas cylinder or container shall be located a minimum distance of six
feet from any temporary combustion device.
Exception:Any temporary combustion device specifically
designed to be attached to a gas cylinder or container.
(iii) Liquefied gas cylinders or containers
shall be connected to temporary combustion devices by means of armored flexible
hose not more than 10 feet nor less than six feet in length.
Exception:Any temporary combustion device specifically
designed to be attached to a gas cylinder or container.
(iv) Such armored flexible hose connections
shall be made by means of metal screw connectors which shall be maintained in a
tight condition.