20 FEBRUARY THE NEW ZEALAND GAZETTE 789

CNG Fuel System Approvals

Pursuant to regulation 90B of the Traffic Regulations 1976 (as inserted by the Traffic Regulations 1976, Amendment No. 7) and pursuant to the powers delegated to me by the Secretary for Transport, I, Robert Norman Abram, Chief Automotive Engineer, hereby approve the components listed in Schedule I hereunder for inclusion in any CNG fuel system installed and operated in accordance with the requirements of New Zealand Standards NZS 5422, Part 2, 1980 (and any standard made in amendment thereto or in substitution therefor being applicable at the date of installation unless directed otherwise) subject to the conditions set out in Schedule II hereunder, and I hereby revoke the Gazette notices listed in Schedule III hereunder that refer to CNG fuel cylinders.

SCHEDULE I

CNG FUEL CYLINDERS

SCHEDULE II

CONDITIONS OF APPROVAL

CNG fuel cylinders are approved subject to the following conditions—

1. That they be permanently and clearly marked, on a thickened portion of the cylinder, with characters not less than 6 mm high, if space permits, but in any case not less than 3 mm high, displaying the following information:

   (a) The specification to which the cylinder was manufactured.
   (b) The manufacturer’s name or mark and the serial number of the cylinder.
   (c) The date of the original cylinder inspection and the identification mark of the inspection authority who made the inspection.
   (d) The date of any periodic cylinder test and the identification mark of the cylinder testing station who made each test.
   (e) The cylinder test pressure.
   (f) The design charging pressure of the cylinder.
   (g) The nominal water capacity of the cylinder.
   (h) Where required by the marking provisions of the specification to which the cylinder was manufactured, the tare weight of the cylinder.

2. That they be clearly marked or labelled to indicate that the cylinder is suitable for use with CNG.

3. That they be provided with valve threads of the form specified in British Standard BS 341 “Valve Fittings for Compressed Gas Cylinders”.

4. That they shall not be charged with CNG to a greater pressure than that approved by the Chief Inspecting Engineer appointed under the Gas Act 1982, as notified in the New Zealand Gazette.

5. That they be provided with a cylinder shut off valve designed for the cylinder working pressure and compatible with the test pressure of the cylinder. Cylinder shut off valves shall be fitted with a handwheel to facilitate ease of opening and closing of the valve and shall be fitted with a pressure relief device, which remains in contact with the gas contained in the cylinder whether the handwheel is in the open or closed position, comprising of a burst disc backed by fusible alloy having a nominal melt temperature of 100°C. Should the alloy melt the burst disc shall yield at a pressure of not less than 24.7 MPa and not more than the test pressure of the cylinder, otherwise it shall remain inoperative. Cylinder valves shall be provided with an outlet thread of ¼ in NPT (female) and a stem thread compatible with the cylinder neck thread.

6. That they be tested at periods not exceeding five years in accordance with the requirements of Australian Standard AS 2337–1980 or in accordance with the periodic test requirements laid down in the specification to which the cylinder was manufactured.

7. That the date of first installation in a motor vehicle of cylinders designed for a working pressure of less than 20 MPa and test pressure of less than 30 MPa in Schedule I is no later than 1 July 1986.