Headframe design

(1) A shaft headframe, whether on surface or underground, shall be designed by a professional engineer and shall be of sufficient height to provide an overwind distance that exceeds the greater of twice the stopping distance of the shaft conveyance travelling at the maximum speed permitted by the hoist controls or 3 meters (10 feet). (2) Before a shaft rope sheave is used, a certificate shall be obtained from the manufacturer or a professional engineer certifying its maximum rated load carrying capacity; the diameter of rope for which it was designed; the maximum Shaft rope sheave 138 breaking strength of the rope for which it was designed; and the maximum amount of groove wear that shall be permitted. Shaft rope sheave grooves. (3) A shaft rope sheave shall have a groove, or inserts with a groove, which is suitable for the rope being used and it shall bear a serial number and a date of manufacture. Non-destructive (4) The shaft of a sheave shall be non-destructively tested for flaws before being put into service and shall be tested annually thereafter.