AS 4983:2010 – Gas fuel systems for forklifts and industrial engines.
(c) Equipment structure—If in lion of containers is req u i red to be on an ove rhe ad guard such installation shall require approval from the manufacturer, or the importer, and be acceptable to the relevant authority where appropriate.
(d) Braking sisIem—Including the handbrake and components.
The weight of the LP Gas container(s) or CNG container(s) will affect the tare weight of the forklift or industrial equipment and consideration of the effect on the legal and manufacturer’s rating on tyre and axle loadings should be considered. In no circumstances shall the equipment’s critical load distribution, which affects safety considerations, be compromised.
Any alteration(s) made to the manufacturer’s original equipment or the engine’s fuel management system shall not adversely affect the original manufacturer’s design, safety level and performance when operating on the fuel for which it was originally designed. If such alterations are made, they shall be approved by the manufacturer or their agent.
Where the industrial equipment was originally designed to operate with a closed ioop engine management system, then a closed loop system shall be retained for LP Gas or CNG operation. This closed loop engine management system shall achieve at least the same exhaust emission levels for LP Gas or CNG whichever is applicable. The exhaust emission levels shall meet the industrial equipment manufacturer’s requirements and shall not be inferior to the emission levels of the original system.
Exhaust emissions from equipment operated in enclosed spaces shall not exceed levels as specified by the relevant authority.
Previously used components and materials may he transferred to other industrial equipment provided that the following conditions apply:
(a) The component or material shall be in good condition and continue to comply with current Standards.
(b) The LP Gas fuel container shall be subjected to the preliminary examination described in the Clause relating to ‘tilling’ in AS 2030.1.
(c) The CNG container(s) recertification interval shall not have expired.
(d) Double f’errule fittings, as permitted for use with CNG, shall only be reused if the ferrules are replaced according to the manufacturer’s published instructions.
(e) The following components and materials shall not be reused:
(I) Any piping or hose that has been subjected to the LP Gas container or CNG container pressure.
(ii) Any screwed fittings other than stainless steel reusable used for the connection of pipes or hoses to components subject to container pressure which have been removed from components.
(iii) Any grommets or fittings used to seal piping through bulkheads.
2.1.1 General
Components shall be suitable for the conditions of use. e.g. temperature, pressure, corrosion, compatibility and vibration. Components may be combined into multifunction units, provided that such units comply with the requirements for each function. Suitability shall be proved by testing wherever appropriate.
2.1.2 Suitability for pressure
2. 1 .2. 1 L P Gas
The design pressure For a component or any portion of a component that is subject to container pressure shall be 2.55 MPa. The suitability of any such components shall be determined either by strength calculation in accordance with normal pressure vessel procedures, or by the ability to withstand bursting in a hydrostatic pressure test at not less than 10.2 MPa applied for not less than I mm.
In addition, each such component shall not suffer damage sLit hcient to cause leakage or malfunction alter being subjected to a cyclic pressure test comprising 10 000 applications of a hydrostatic pressure of 5 MPa. Connections to the component under test, methods of mounting and means of blanking openings shall be representative of’ actual installation fittings, and shall not provide additional stiffening or support for the component under test.
The material of any valve body that is subject to container pressure shall comply with
AS 2473.
All components subject to container pressure, excluding the container, shall have a burst pressure of not less than four times the fuel container rated working pressure.
All other CNG components subject to gas fuel system pressure shall have a burst pressure of not less than four times their maximum operating pressure.