(A) Standard full weight wrought iron, galvanized iron, steel or brass pipe or approved brass or copper tubing shall be used throughout. Underground piping shall be galvanized or equivalent.
(B) Pipe used in the installation of the domestic type burners shall not be smaller than three-eighth inch iron pipe size; pipe used in the installation of industrial type burners shall not be smaller than one-half inch iron pipe size. Suction lines for equipment burning grades No. 5 and 6 oil shall not be less than one and one-half iron pipe size to within 30 inches of the pump or burner. Copper or brass tubing used in the installation of domestic type burners where the oil flows by gravity from the tank to the burners shall not be smaller in size than three-eights inch outside diameter, forty-nine-thousandths inch wall thickness tubing. For industrial type burners, such copper or brass tubing shall not be smaller in size than the equivalent of the iron pipe size mentioned above with wall thickness not less than forty-nine-thousandths inch.
(C) Piping shall be rigidly secured in place and protected from injury in a workerlike manner and where necessary, shall be protected against corrosion. Where practicable, oil piping shall be buried underground or in a concrete floor or placed in a metal-covered pipe trench.
(D) Unions shall be ground type conical seating with faces of metal. Flanged or packed joints shall not be used. Compression fittings shall not be permitted for joints made on copper tubing.
(E) Valves shall be constructed so that the stem cannot be withdrawn by continual operation of hand wheel. The packing gland shall be provided with a separate shouldered unheaded follower having a beveled contact space for the compression of the packing.
(F) All threaded joints shall be made with lethargy and glycerine shellac, or other approved compound, free from leaks and made up so as to form an adequate joint.
(G) Proper allowance shall be made for expansion, contraction, jarring and vibration. Pipe lines, other than tubing, connected to underground tanks, except fill lines and test wells, shall be provided with double swing joints arranged to permit the tank to settle without impairing the efficiency of the pipe connections.
(H) Oil supply lines to burners shall be provided with approved strainers.
(I) Gas pilot supply piping shall be provided with an approved shutoff valve and with an approved properly vented gas pressure regulator.
(J) Fused valves of approved type shall be installed in oil supply lines at each tank and within six inches of each burner. In the case of underground tanks, the fused valve shall be located at the highest point visible in the suction line.
(Ord. 19, passed 1-7-1955)