Sec. 11-17. Piping from unloading point to storage tank.
No pipe or other conduit of any kind used for the purpose
of transporting flammable liquids shall be constructed in,
under or over any public street in the city. It shall be unlawful
to transport or handle gasoline or other flammable
liquid through pipes or other conduits of any kind from any
unloading point as provided for in section 11-16 to any storage
tank or other container within the fire limits until after
an application to pipe such flammable liquid has been finally
approved by the city manager. No such final permit shall be
issued until the following requirements have been complied
with:
(a) All applications for a permit shall be accompanied by
complete plans and profiles of the proposed underground pipe
systems.
(b) Pipe shall be standard weight wrought iron or steel.
(c) Except within eight feet from the tank car and a like
distance from the storage tank, piping shall be buried a minimum
depth of three feet and shall be laid below all other
piping. Where pipe passes under railroad tracks it shall be
laid at least four feet below the bottom of the ties.
(d) Piping shall rest on a solid earth foundation or shall
be otherwise securely installed to minimize the possibility of
undue stresses at the joints from settling.
(e) Piping shall be suitably protected against corrosion by
coating with asphalt or other corrosion-resisting material.
(f) Pipe joints shall be made up with threaded couplings
or shall be welded or otherwise made up in a substantially
equivalent manner. Joint compounds used on screwed joints
shall be of shellac, litharge, glycerine or other material not
affected by the liquid carried in the pipe.
(g) Provision shall be made for taking care of expansion
and contraction in the pipe line.
(h) Shut-off valves shall be installed in the discharge line,
at the pump and at a convenient location near the storage
tank. Where the elevation of the top of the storage tank is
higher than that of the pump, a check valve shall be placed
in the discharge line to prevent the liquid from backing up
into the tank car. Long pipe lines shall be provided with
intermediate shut-off valves, the number depending on the
length of the line.
(i) Valves shall be set in manholes or have the valve stem
extended to a valve box having a cover normally locked to
prevent operation by unauthorized persons. Valve box or
manhole covers shall be plainly marked to indicate the nature
of the line which the valve controls.
(j) Piping shall be tested after installation and before
being covered, at a pressure of not less than one hundred fifty
pounds per square inch, nor less than one and one-half times
the working pressure. Tests shall continue for at least thirty
minutes without a noticeable drop in pressure. (Code 1959, §
11-17.)
