AS 4730.2:2018 pdf free

AS 4730.2:2018 pdf free.Mining – Winding equipment
The braking system shall have inherent redundancy such that the failure of any component does not prevent effective operation of the brake system. The braking system shall include a minimum of two independent channels and two discs or cylindrical brake paths.
Following the failure of any component of the braking system the remaining braking capacity shall be sufficient to hold the winder drum stationary while supporting the maximum static suspended loads with at least the following margins:
(a) For single drum winders, 200 % of the maximum static suspended load applied to the drum.
(b) For double drum winders without a clutch or with a clutch engaged, fitted with one overwound rope and one underwound rope, 200 % of the maximum static out of balance suspended load applied to the winder.
(c) For double drum winders in an unclutched mode when used for maintenance purposes where personnel riding is not permitted, 150 % of maximum static suspended load applied to each drum.
(d) For friction winders when conveying personnel, 200 % of the maximum static out-of-balance suspended load.
(e) For friction winders when not conveying personnel, 150 % of the maximum static out-of-balance suspended load.
NOTE See Appendix C for sample static brake holding capacity calculations.
The design shall include:
(a) A documented and detailed analysis of the failure modes of the braking system. This includes all mechanical and electrical components within each system.
(b) A documented functional safety analysis including mechanical and electrical components with references to recognized standards (see Clause 2.3).
(c) Analysis to confirm that the total design brake torque under static and dynamic conditions provides a determined margin between the highest required and the lowest available brake torque. The margin shall be chosen so that rates of deceleration do not exceed predetermined design parameters.
The braking system, following the failure of any one brake channel or single line component, shall be capable of bringing the conveyance safely to rest within the design deceleration rates and shaft operating parameters. This capability shall be in line with risk assessment outcomes and integrated into the design of the speed distance envelope.AS 4730.2 pdf free download.