924
THE NEW ZEALAND GAZETTE.
No. 31

time specified, provide, and properly and efficiently construct, such stench-trap, with watertight receiving pits or basins, as aforesaid, to the satisfaction of the said officer; and in the case of stench-traps, receiving pits or basins out of repair, after receipt of a like notice, well and sufficiently repair the same within the time specified in such notice to the satisfaction of the said officer.

45. Traps of three classes may be used, viz.:

(a.) Traps for intercepting gases only, to be of round section and self-cleansing form, but not so easy as to empty by momentum or suction.

(b.) Silt-traps for intercepting both gases and solids, to have slightly tapered sides, flat bottoms, and rounded, not sharp, angles, and provided with trays fitted with handles for catching or removing solids.

(c.) “Grease-traps,” for solidifying and collecting grease or other semi-fluid matter liable to foul the pipes, must be of such form as may be approved by the Inspector.

46. The term “gully” will be applied to traps (a) and (b) in cases where they are to be used externally and fitted with dished tops and gratings. In such cases the dish must be in one piece with the trap, or jointed thereto spigot and faucet, and the depth of the dish from the top to the grating must not be less than half the diameter of the pipe, and the grating must be removable.

47. The term “disconnector” will be applied to the traps in cases where provision has to be made for inlet ventilation for the pipe or pipes discharging therein.

48. All traps must have a water seal of at least half the diameter of the outlet-pipe, but in no case less than 2½ in.

49. Every urinal, lavatory, slops sink, kitchen sink, bath, and every tub or set of tubs, must be separately trapped by an approved trap placed on the waste-pipe as close to fixture as possible. The trap must be of equal bore with the waste-pipe, and be provided with an access-cap for inspection.

50. Sinks in all butchers’ shops, hotels, restaurants, and boardinghouses, or wherever ordered by the Board, shall be provided with suitable approved grease-traps. Wash-rooms for carriages, carts, &c., must have silt-traps provided with proper means of intercepting mud, grit, &c.

51. Stables, cab-stands, &c., and paved back yards, for which drainage permits have been granted, must be provided with suitable approved silt-traps.

52. In no case shall traps known as D traps or bell traps be used.

53. All lead traps shall be drawn or worked.

54. In all cases where houses are provided with water-closets, or where the drain-connection to sewer exceeds 40 ft., at the highest point of the drain a ventilation-shaft shall be furnished, having a diameter of 4 in., or the soil-pipe may be carried up full width as air-shaft. No part of such shaft shall be placed inside any building. Such shaft shall be carried to a height not less than 3 ft. vertically above the ridge of the building in respect of which such disconnector trap is made. A cap or cowl of an approved pattern shall be fixed on the top thereof. No connection other than with the drain shall be made to any main ventilation-shaft. Where underground, every such ventilation-shaft shall be of stoneware drainpipes laid in a workmanlike and efficient manner and to the satisfaction of the Inspector, or of cast-iron pipe with lead or rust joints. To a height of 6 ft. above the surface of the ground the shaft shall be of cast iron not less than ⅛ in. in thickness, similarly jointed, or of screwed wrought-iron piping; thence to its outlet it may be made of cast iron, screwed wrought-iron pipe, 6 lb. lead, or galvanised iron of not less than 20 B.W.G. The connection between the stoneware and the vertical pipe shall be made with cement, which, together with all other joints, shall be perfectly airtight. If galvanised iron is used, the pipes shall be made with double-lapped and soldered longitudinal joints in long lengths, and the transverse joints shall be not less than 2 in. in length, slipped or socketed and soldered. The connection between the galvanised-iron pipe and the cast-iron portion of the shaft shall be of lead run in and caulked, the portion of the galvanised-iron pipe inside the socket of the cast-iron pipe being strengthened by a galvanised-iron band, 3 in. wide, of 20 B.W.G., soldered to it. Putty shall not, under any circumstances, be used for jointing any ventilation-pipes. No angular joints or elbows shall be used below the eaves-level. This shaft shall be properly constructed and supported, and carried in as direct a manner as possible.

55. If, after a ventilation-shaft shall have been erected, the same shall, by reason of the erection of any new building or buildings, or the addition to or alteration of any building (including any building in respect whereof such shaft may have been furnished), or by reason of any other matter or thing, become or be in a position or in any other respect not in accordance with the foregoing section, it shall be lawful for the Board, by notice in writing signed by the Clerk, to require the owner of the premises upon which such shaft shall be erected to do within a stated time any reasonable act or things, to be specified or indicated in such notice, so as to cause such shaft to be in accordance with the said foregoing section, or with any of the provisions of such section that may be referred to in that behalf in such notice; or by like notice to require such owner, within a stated time, to remove or effectually stop up such shaft, and to remove or alter the position of the disconnecting-trap in such manner and subject to such stipulations as may be set out in such notice. The Board may from time to time renew any notice given under this section.

56. Disconnected bath, sink, and lavatory vents need not extend more than 3 ft. above the eaves unless otherwise ordered by the Inspector. Every vent-pipe must be of undiminished size, without return bend, with educt or induct cowls approved by the Inspector, and it must not open near a window, a chimney, nor an air-shaft which ventilates a living-room.

57. All vent-pipes in an extension of a main building must be extended to such a height as may be deemed necessary by the Board above the roof of the main building, when otherwise they would open within 30 ft. of the windows of the main house or of the adjoining house.

58. Branch drains need not be ventilated if the gully traps are less than 15 ft. from the main house-drain, or unless ordered by the Board.

59. Traps subject to siphonage must have the waste-pipe leading therefrom vented by a special pipe taken from such a position that its entrance will not be fouled by the discharge of the traps. The vents must be not less than two-thirds of the diameter of the pipe they ventilate.

60. Vent-pipes must be of cast iron, wrought iron, or lead inside a building; dipped and folded galvanised iron may be used where they are entirely outside a building; and all shall be connected with the traps they ventilate by brass or lead ferrules, or other joints approved by the Inspector.

61. The various vent-pipes may be branched into a waste-pipe of the same class above the inlet from the highest fixture. They may be combined by branching together those which serve several traps of the same class. These vents must always have a continuous slope, and be as nearly vertical as possible to avoid collecting water by condensation.

62. No vent-pipe shall be used as a waste-pipe. Rain-water pipes shall not be used as ventilators. As far as possible all vent-pipes shall be placed outside buildings. No brick, earthenware, or house-chimney flue shall be used as a sewer-ventilator nor to ventilate any drain or waste-pipe.

63. All inlets to drains or openings for ventilation shall be efficiently protected by proper gratings of ample area. The aggregate area of the apertures in any grating covering a ventilation-opening shall be not less than the sectional area of the pipe or drain to which such grating is fitted.

64. All bath, lavatory, sink, wash-tub or other waste-pipes shall discharge into the open air, either directly over a trapped gully, at a height of not less than 6 in. nor more than 12 in. above the grating thereof, or over (and at a height of 3 in. above) a watertight channel led to a gully trap, and not being distant therefrom more than 6 ft. The effective area of the intake shall not be less than that of the pipe.

65. Where a safe is provided under any bath, sink, or other convenience it shall be provided with an overflow-pipe of lead not less than 1½ in. in diameter discharging into the open air through the nearest external wall.

66. Wastes from disconnected fittings, except urinals and slops sinks, need not be ventilated unless they exceed 12 ft. inclined or 18 ft. vertical in length, and branch wastes to such fittings if connected to a ventilated main waste may be 12 ft. in length without being ventilated, unless siphonage occurs in a trap, in which case air must be supplied to the waste of that trap.

67. Waste-pipes must have an approved fall, be as free from bends and as short as possible.

68. Separate internal wastes shall be provided for each of the following classes of polluted waters, viz.:

(1.) Dirty water from baths, pantry, and china-closet sinks, lavatories, and wash-troughs, and other waters with a small proportion of soap and dirt.

(2.) Greasy water from kitchen and scullery sinks where grease-traps are required.

(3.) Sludge-water from factories, stables, cowhouses, cabstands, and other specially polluted surfaces, for which consent has been granted by the Board.

(4.) Discharge from housemaids’ slops sinks, public or private urinals.

69. A main waste-pipe into which lavatories, baths, or kitchen sinks discharge must be at least 2 in. in diameter, with at least 1½ in. branches, except for single lavatories and urinals, which may be 1¼ in.