A.
Gas piping and gas appliances in buildings shall be
installed in accordance with standard safe practice.
B.
Installation of gas piping and appliances for domestic
and commercial uses, in accordance with the standards of the National
Board of Fire Underwriters for the Installation of Gas Piping and
Gas Appliances in Buildings (Pamphlet No. 54), shall be deemed prima
facie evidence of installation in accordance with standard safe practice.
A.
Where the pressure of gas supplied to domestic, commercial
or other low-pressure gas piping systems in buildings is in excess
of one pound per square inch, an approved gas pressure regulator of
sufficient size shall be installed in the service pipe of each such
system to prevent pressure in excess of one pound per square inch
from being introduced into such building piping.
B.
If located inside a building, the above required regulator
shall be equipped with a vent pipe leading to the outer air. Means
shall be employed to prevent water from entering this pipe and also
to prevent stoppage of it by insects or foreign matter.
Where gas piping enters a building through a
wall or floor of masonry or concrete, any gas pipe or other nearby
pipes entering the same wall or floor shall be suitably sealed against
the entrance of water or gas.
Approved means for shutting off the flow of
gas from outside the building shall be provided on every gas service
pipe. Outside gas shutoff cocks or valves shall be located so as to
be readily accessible and, when underground, shall be placed in suitable
valve boxes, manholes or vaults the covers of which shall be clearly
marked "Gas."
