TABLE 2.-Horizontal or vertical tanks not over 1,100 gallons TABLE 4.-Vertical tanks over 1,100 gallons capacity Under 40 feet in diameter and containing not more than 5,000 gallons: Bottom No. 8 gage. Bottom ring No. 8 gage. Other rings No. 10 gage. Top No. 12 gage. (b) All tanks in excess of 5,000 gallons shall be designed to provide a factor of safety of 4. (0) No vertical tank shall exceed 35 feet in height. (d) Riveted joints shall have an efficiency of at least 60 per cent. (e) Joints. (See sec. 5.) (f) Rust proofing. (See sec. 6.) SEC. 14. Roofs or tops.-No wooden or loosely fitting metal roofs or tops shall be permitted. Roof or top shall be without unprotected openings, shall be firmly and permanently joined to the tank, and all joints made as noted in section 5. SEO. 15. Venting of tank.-(a) A permanently open vent conforming to section 7 shall be provided. (b) Each inside above-ground tank over 1,000 gallons in capacity shall have all manholes, vent openings, and other openings which may emit inflammable vapor provided with 40 by 40 mesh, noncorrodible wire screen, or its equivalent, so attached as to completely cover the opening and be protected against clogging. SEC. 16. Filling pipe.—Provisions of section 8 shall govern. SEC. 17. Setting of tanks.-Tanks with bottom more than 1 foot above the ground shall have firm foundation and supports of incombustible materials, except wooden cushions. The storage of combustible material within 10 feet of any tank is prohibited. PIPING SEC. 18. General requirements.-Cross connections permitting gravity flow from one tank to another shall be prohibited. All pipe connections to tanks and other oil containing or using devices shall be made in a substantial, workmanlike manner. All piping shall be of the standard full-weight wrought-iron or steel type for working pressures less than 100 pounds; for working pressures in excess of 100 pounds extra heavy pipe and fittings shall be used. No pipe less than one-half inch internal diameter will be permitted. No right and left couplings shall be used, and unions shall be of an approved type. SEC. 19. Installation.-(a) Piping shall be run as directly as possible without sags, and so laid that where possible pipes pitch toward the supply tank without traps; provision shall be made for expansion, contraction, jarring, and vibration. (b) All connections of air lines to burners shall be made on the upper side and shall extend upward for a distance of at least 12 inches. SEC. 20. Tests.-Piping for systems with working pressures under 100 pounds after installation shall be tested and proven tight at a pressure of not less than 150 pounds; where working pressures exceed 100 pounds piping shall be tested and proven tight at a pressure 50 per cent in excess of the working pressure. SEC. 21. Protection to piping.-(a) Piping between any separated oil containing or using part of the equipment shall be as far as practicable laid outside of the building underground and properly protected against corrosive action; if necessarily inside, it shall preferably be laid in a trench with proper metal cover; if on floor or subject to mechanical injury, it shall be protected. (b) Pipes leading to the surface of the ground or above the floor, particularly risers to furnaces, shall be protected against injury. Fill and vent pipes shall also be protected. (c) Riser pipes from the oil-supply lines to burner fittings shall not be less than 1 inch in size. SEC. 22. Outside piping.—(a) All outside piping shall be laid in solid earth or in a trench. Oil pipes shall not be located near nor in the same trench with other piping, excepting steam lines for heating. Propping the pipes on wooden blocks shall be avoided. (b) Openings for pipe through outside walls below the ground level shall be made oil tight and securely packed with flexible material. SEC. 23. Valves.-(a) All valves shall be of an approved type. (b) Shut-off valves shall be provided on both sides of any strainer which may be installed in pipe lines; in discharge and suction lines to pump; in discharge and return lines to any tank as near tank as practicable; and in branch lines near burners. An outside readily accessible valve shall be provided on all supply lines entering buildings. This valve is to be used for the purpose of cutting off the oil supply and shall conform in all particulars to the standard approved and adopted by the chief engineer of the fire department. In installations where the pump is located at a distance from the burners it is advised that a remote control device be installed so that the supply of oil can be cut off at the pump in case of accident. (c) A check valve of an approved type shall be installed in each air line where an inclosed type of burner is used. (d) A pressure relief valve shall be installed in supply line to burners and so arranged as to return surplus oil to supply tank. (e) The use of automatic shut-off valves for the oil supply is recommended. SEC. 24. Strainers.-Suitable strainers shall be installed in the suction line. Large basket strainers are recommended in the receiving or filling line of storage tank to remove dirt and foreign matter. SEC. 25. Oil level indicating device. A test well or gaging device shall be installed and so designed as to prevent the escape of oil or vapor within the building at any time. Top of well shall be sealed, and where located outside of building kept locked when not in use. HEATING SEC. 26. Heating of tanks.—(a) Where it is necessary to heat oil in storage tanks in order to handle it, the oil shall not be 80406-30-8 heated to a temperature higher than 40° F. below the flash point, closed up. (b) Heating shall be done by means of properly installed coils within the tank, using only steam or water. Thermostatic control and thermometer shall be provided for all heating devices. SEC. 27. Heaters, other than those for tanks.-(a) Heaters shall be of substantial construction; all joints shall be made oil tight. (b) Only steam, water, or approved electrical heater shall be used for preheating. (c) Heater shall be by-passed so that in warm weather it will not be under constant pressure while not in use. BURNERS SEC. 28. (a) The burner mechanism shall be so designed as to not enlarge the orifice, and so that the needle valve can not be unscrewed and removed in operating. (b) The burner shall be properly supported, if necessary, independently of the piping. DAMPERS SEC. 29. Dampers in chimneys or stacks shall be of a type that will swing into the wide-open position in the event of any abnormal pressure within the combustion chamber. Dampers shall be so installed as to maintain their normal position for draft pressures not in excess of 10 per cent more than may be required for complete combustion. Attention is called to the serious hazard arising should dampers in the flues to the stacks be closed or induction fans be inoperative at the time the oil is being ignited. Owing to the liability of explosion, the operator must assure himself positively that all vents are clear and open before starting the fire. PUMPING SYSTEM SEC. 30. Pumping systems.-Oil shall be pumped from tank to burners. Systems where burners are supplied by gravity from or pressure on storage tanks are prohibited. SEC. 31. Pump.—(a) Pump shall be of an approved design and secured against leaks. (b) It shall be located in a room cut off from oil-burning devices and provided with entrance which can be reached with out passing through room where burners are located; if this is not practicable, provision shall be made for remote control. (c) Pump used in connection with the supply and discharge of storage tanks shall be located outside embankment walls and at such a point that it will be accessible at all times, even if the oil in the tank or reservoir should be on fire. (d) Pumps shall be installed in duplicate where fire-protection equipment is dependent on the use of fuel oil for heating or steam, or where necessity for continuous operation of plant makes it impracticable to shut down for repairs. DIAGRAM OF PIPING SEC. 32. The contractor installing the fuel-oil equipment shall furnish copies of diagrams showing all of the main oil lines and controlling valves, and these diagrams shall be posted where the oil system is installed, and also at some other point which will be accessible in case of a fire where the fuel-oil equipment is located. PART II EQUIPMENT FOR DOMESTIC USE REQUIRING AN ATTENDANT CONSTANTLY ON THE PREMISES NOTE. These regulations do not apply to oil-burning devices employing a wick. SECTION 1. Permit.-Oil or fuel oil under the provisions of Part II of this article, shall have a flash point above 100° F., closed-cup tester. In determining the flash point, either the Elliott, Abel, Abel-Pensky, or Tag closed testers shall be used, but the Tag closed tester (standardized by the United States Bureau of Standards) shall be authoritative in case of dispute. All tests shall be made in accordance with the methods of tests as adopted by the American Society for Testing Materials. Oil-burning equipment, under the provisions of Part II of this article, includes all equipment connected to an oil burner or burners, including storage tank, supply tank, provisions for filling storage and supply tanks, piping, burners, and all accessories. No oil-burning equipment shall be installed in the District of Columbia until application shall have been made to the fire marshal, District of Columbia fire department, and until permission to make the installation shall have been granted by |