ASME B30.5:2018 pdf free download

ASME B30.5:2018 pdf free download.Mobile and Locomotive Cranes.
(2) Load hoist drums shall have rope capacity with the recommended rope size and reeving sufficient to perform crane service within the range of boom lengths, operating radii, and vertical lifts specified by the manufacturer.
(-a) No less than two full wraps of rope shall remain on the drum when the hook is in the extreme low position.
(.b) The drum end of the rope shall be anchored to the drum by an arrangement specitied by the crane or rope manufacturer.
(-c) The drum flange shall extend a minimum one- half rope diameter or 1/2 in. (13mm). whichever is greater. uver the top working layer of rope.
(3) The load hoist drums shall provide a first layer rope pitch diameter of not less than 18 times the nominal diameter of the rope used.
(4) A means controllable from the operator’s station shall be provided to hold the drum from rotating In the lowering direction and be capable of holding the rated load without further action by the operator. Foot-operated brakes having a continuous mechanical linkage between the actuating and braking means, capable of transmitting full braking force, and equipped with a positive mechanical means to hold the linkage in the applied position, meet this requirement.
(5) Drum rotation indicators should be provided and located to aflord sensing by the operator.
(b) Load Ho& Brakes
(1) When power-operated brakes having no continuous mechanical linkage between the actuating and braking means are used for controlling loads, an automatic means shall be provided to set the brake to prevent the load from falling In the event of loss of brake control power.
(2) FooL-operated brake pedals shall be constructed so that the operator’s feet. when In proper position, will not sup oft. and a means shall be provided for holding the brakes In the applied position without further action by the operator.
(c) Power-Con trolled Lowering. When provided, a power-controlled lowering system shall be capable of handling rated loads and speeds as specified by the manufacturer. Such a system is recommended to assist in precision lowering and to reduce demand on the load brake.
(d) EyImders With Rope Reeving. Cranes using a load hoist mechanism with hydraulic cylinder(s) and rope reeving shall have power and operational characteristics sufficient to perform all load lifting and lowering functions required in crane service when operated under recommended conditions. Sheaves used in multiple rope reeving shall have a pitch diameter not less than 16.