(a)   General.
      (1)   Gas shut-off valves and accessory appliances shall include valves approved as such by the Bureau of Standards, Washington, D.C., by the Underwriters' Laboratories, Inc., Chicago, Ill., by the Associated Factory Mutual Laboratories of Boston, or other recognized standard laboratory; and all valves shall be approved and meet the test prescribed by the Board of Standards and Appeals.
      (2)   Gas shut-off valves shall be installed only by corporations, firms or individuals who shall furnish evidence of their qualifications under the Code of Ordinances, to the Fire Commissioner or the Tenement House Commissioner in their respective jurisdictions.
      (3)   Such corporations, firms, or individuals shall maintain a service station which shall be in direct communication with the Fire Department by telephone or telegraph. Location of service station and means of communication shall be on file with the Fire Commissioner in order that the Fire Department may insure immediate service when the gas is turned off by the members of the Fire Department or from any other cause.  The Fire Department shall have exclusive use of gas shut-off valves to be operated in the event of fire or other emergencies.
      (4)   All gas shut-off valves to be installed must be made of the best quality of standard materials.
   (b)   Protection of valves.
      (1)   The gas shut-off control shall be protected by a suitable, approved metal box placed on the exterior of the building, which shall be connected, through a rigid metal conduit, by a cable, with the valve body placed on the gas intake where the gas pipe enters the building, and as near as practicable to the inside face of the wall, before reaching the meters. The lock for securing box on outside wall of building shall be operative only by a Fire Department inner box key by members of the Fire Department.
      (2)   All valve bodies shall be made of brass or bronze. If a spring is used to actuate a valve in conjunction with the fusible link, it shall be of the best quality phosphor bronze.
      (3)   The internal mechanism which acts to shut off the gas shall be securely connected with the external mechanism by a direct mechanical connection, made gas tight, where it passes through the valve body, by a stuffing box filled with soft, well-lubricated packing, in accordance with recognized standard practice.
   (c)   Installation.
      (1)   The valve shall be so installed as to be conspicuously displayed and readily inspected and reset by authorized persons.  Valves shall be located so that condensation will not accumulate in the valves; and shall be installed so that gas will flow through the valve in direction indicated on it.
      (2)   Valves shall be secured in piping by threaded connections or companion flanges. Combustible packing or sheet lead shall not be used between flanges.
      (3)   The gas main at both ends of the valve must be rigid and secure to withstand the pull from the control handle. Additional non-combustible brackets or hangers must be provided, if necessary, to secure and maintain rigid installation.
      (4)   The valve shall be enclosed in a substantial, perforated metal case, conspicuously exposed, painted red, protected by standard lock acceptable to the Bureau of Fire Prevention and shall indicate the name, telephone number and address of installer, to insure prompt service to property owner.
      (5)   Casing of the valve on gas intake shall be kept locked to protect valve from interference and make it accessible only to authorized persons. Perforations, to allow circulation of air around fusible link, shall be provided and so arranged as to prevent tampering with valve when casing is locked.
   (d)   Control box.
      (1)   The control handle for the manual closing of the valve shall be in a locked metal control box having a cast iron cover conspicuously labeled with raised letters, painted red.
      (2)   On the outside of the cover or the inside of the control box, in raised or stamped letters, or on a securely fastened metal plate, shall be displayed concise operating directions, together with the name, initials or registered trademark of the manufacturer.
      (3)   The control box must be placed as nearly vertically above the point where the gas main enters the premises as is practicable, when this does not involve excessive length of cable and extra turns, and at a height above the sidewalk or grade, of not less than two (2) feet and not more than five (5) feet. Without special permission, the control box shall not be placed or mounted on basement window frames, or directly above basement windows or other openings, nor shall it be located behind doors or other obstructions which would prevent the Fire Department from having easy access to it.
      (4)   Control boxes must be securely and permanently fastened. Whenever possible, they shall be fastened to a non-combustible wall, pillar or column. They shall be secured by not less than two 3/16 inch bolts or the equivalent. Unless the building is so constructed that the control box must unavoidably be secured to a wooden part, the use of wood screws is not permitted for supporting countersunk control boxes; lag bolts shall be used. When the walls are of masonry or concrete, through bolts, expansion bolts or toggle bolts shall be used. All fastenings must be arranged so that they cannot be loosened except from inside opening of the control box.
      (5)   Control boxes may be set or recessed into the wall to a depth not greater than the depth of the box so that cover is flush with the face of the wall. Control boxes may be mounted directly on the surface of the wall.
      (6)   The control box shall be located on the outside of the building wall, facing the street, whenever possible. When the control box is installed on an alley face of a building, or in a similar place where the control box is subject to injury from passing vehicles, etc., the control box must be thoroughly protected. This may be done by having the control box recessed, marked by waterproof red paint ring and waterproof white paint ring on the wall, or, when such protection is not available, protected by heavy iron channels or angles secured to the wall by through bolts, expansion bolts, or toggle bolts.
   (e)   Control handles. Control handles shall be of standard construction, arranged to fit the control boxes so that they may be locked without difficulty, and cable connections shall be securely made in an approved manner, according to the design of the handle.
   (f)   Cable.
      (1)   The connection between the valve and control handle shall be as direct as practicable, and shall consist of a single piece of standard phosphor bronze cable not less than 3/32 inch in diameter. No splices in the cable shall be permitted.
      (2)   It is essential that cable connections to valve and handle be securely made according to the design in each case. The cable may be slightly annealed for making ends, and when cutting the cable, it should be taped and cut through the tape, or a small amount of solder applied where it is to be cut, so as to prevent frayed end.
   (g)   Conduit.
      (1)   The control cable for the shut-off valve shall be run in galvanized wrought iron or steel pipe or other standard and approved conduit not less than 1/2 inch in pipe size. The pipe or conduit line must be water-tight and continuous from the casing enclosing the operating mechanism of the valve to the control box on outside of building. The cable shall not be exposed at any point in its length.
      (2)   All ends of pipe or conduit, not only at valve and control box terminals, but in the run of the piping, shall be carefully reamed so as to remove burrs and fins caused by cutting-off tools, which would interfere with the movement of the cable in the run, or cut, or wear the cable. Unions should not be employed in making joints.
      (3)   Pipe or conduit must be rigidly and permanently secured in position. Pipe straps and hangers of standard forms may be employed for this purpose. In every case supports must be provided at points sufficiently numerous to prevent sagging. Pipe straps (if used) must be of metal of sufficient thickness to insure a permanent fastening and must be thoroughly coated to prevent corrosion.
   (h)   Bends and offsets.
      (1)   Bends of small radius or through much of an arc, introduce possibilities of binding of the cable or of an appreciable friction resisting the pull of the cable: therefore, approved roller fittings shall be required wherever the pipe or conduit is bent to a radius of less than 4 inches, or wherever the bend is through an arc exceeding 15 degrees except as outlined for offsets.
      (2)   When connections to control boxes are made from below it is frequently necessary to make an offset in the conduit to avoid a water table or other part of a building wall. One offset of not more than 2 inches will be permitted for each installation at such points. The bends in the pipe forming the offsets must be carefully made to avoid cracking the enamel or galvanized coating or the flattening or cracking of the pipe or conduit. The amount of offset shall not exceed 2 inches and the length of the offset shall not be less than five times the amount of the offset. For example, a 2-inch offset must be at least 10 inches long. Single offsets only shall be permitted. Double offsets are not acceptable.
         (i)   Roller fittings. For turns in the conduit greater than those mentioned above, approved roller fittings shall be used. No roller fittings turning more than 90 degrees from a straight line shall be used.
   (j)   Automatic control. The fusible link which controls actuation of the valve in the event of direct heat, shall melt at not less than 225 degrees F. and shall be so arranged as to in no way interfere with the manual means of shutting off the gas which is controlled by the handle in box placed on the face of the building. Only approved fusible links shall be used. Automatic control shall in no way depend upon electric current for its operation.
   (k)   Production tests at factory. Valves must be tight under the following tests: (1) Valves shall be mounted in the position in which they are designed to operate. Normal city gas pressure or equivalent air pressure shall be applied to the inlet side and the valve shall completely shut off the gas or air when closed as in normal operation.
      (2)   To determine whether the valve shuts off tightly under this test, a tube shall be connected with the outlet side of the valve and the outer end of the tube shall be immersed in water to a depth not exceeding one (1) inch, indicating leakage by bubbles rising through the water from the end of this tube.
      (3)   Valves, after this test, shall be capable of shutting off ten (10) pounds air pressure applied to the inlet side; to determine whether the valve is tight, the test procedure shall be as indicated in the preceding test.
      (4)   Valve bodies shall be strong enough to withstand, without leakage, one hundred (100) pounds pressure applied from either end with the other end closed. In this test the entire valve, including the stuffing box, shall be completely immersed in water, so that leakage will be indicated by bubbles rising through the water.
      (5)   The fusible link connections of each valve shall be carefully tested to avoid prematurely operating the gas shut-off valve through vibration or concussion. The construction of the fusible link connections shall be so designed and made that the automatic feature will not operate through vibration or concussion.
      (6)   The entire process of manufacture of the valves shall be subject to inspection and review and each valve shall be tested at the factory by a recognized laboratory or agency with facilities for making the test prescribed by the Board of Standards and Appeals, and each valve must bear satisfactory evidence that it has been so tested.
      (7)   Manufacturers of gas shut-off valves must submit the name or names of said laboratories or agencies to the Fire Commissioner or the Tenement House Department Commissioner, in their respective jurisdictions, with satisfactory evidence of their ability and facilities to properly carry out said tests.
      (8)   Valves and operating mechanism shall be so designed and constructed that they will withstand deteriorating effects or corrosion, as evidenced by operating tests.
   (l)   Installation and inspection tests.
      (1)   After shut-off valve is installed, it shall be set and operated to determine that proper closure is secured by operating the control handle. Particular care should be taken to observe that when operating the control handle, no part of the cable or of its attachment to the valve interferes in any way with the positive closure of the valve.
      (2)   After the above test, all gas outlets in the building must be inspected to insure their being closed before the valve shall be set and the gas turned on. Valve and connections shall also be tested for leaks by applying a solution of soap and water to all parts, including connections to gas piping.
      (3)   After the valve has been used to shut off gas, it shall be reset only by authorized corporations, firms or individuals, or by members of the Fire Department.
      (4)   Operating and installation corporations, firms or individuals responsible for the installation of the gas shut-off valves shall permanently maintain properly equipped service stations in each of the boroughs where they install valves.
   (m)   Inspection. Gas shut-off valves and installations shall be inspected at least once a year by members of the Fire Department or the Tenement House Department, in their respective jurisdictions, or by corporations, firms or individuals authorized to install gas shut-off valves, as determined by the Fire Commissioner or the Tenement House Department Commissioner, in their respective jurisdictions.
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