ASME B30.6-2010 pdf download
ASME B30.6-2010 pdf download.Derricks.
6-1.2.5 Chicago Boom Derricks The fittings for stepping the boom and for attachment of the topping lift shall be arranged to (a) permit the derrick to swing at all permitted operating radii and mounting heights between fittings (b) accommodate attachment to the upright member of the host structure (c) withstand the forces applied during normal operation with rated loads at permitted operating configurations (d) prevent the boom or topping lift from lifting out under tensile forces SECTION 6-1.3: ROPES AND REEVING ACCESSORIES 6-1.3.1 General Wherever exposed to temperatures in excess of 180°F (82°C), rope having an independent wire rope core, wire strand core, or other temperature damage-resistant core shall be used. 6-1.3.2 Guy Ropes (a) Guy ropes shall be of a size, grade, and construc- tion to withstand the maximum load imposed. (b) The minimum breaking strength ofeach rope shall notbe lessthan3 timesthestaticloadapplied to the rope. (c) Guy attachments such as turnbuckles shall have provision to prevent loosening during usage. 6-1.3.3 Boom Hoist Ropes (a) Boom hoist ropes shall be of a size, grade, and construction to withstand the maximum load imposed. (b) The live rope-reeving system in a boom suspen- sion shall withstand the maximum load imposed and be of a length to permit lowering the boom point to horizontal position with at least two full wraps of rope remaining on the hoist drum. (c) The nominal breaking strength of the most heavily loaded rope in a system shall not be less than 3 1 ⁄ 2 times the load applied to that rope. (d) Rotation resistantropes shall notbe used for boom hoist reeving.
(d) Rotation-resistant ropes shall have a design factor of 5 or greater. [The design factor of 5 or greater for rotation-resistant ropes may be modified by the derrick user by complying with the provisions of para. 6-3.3.1(c)]. (e) Rotation-resistant ropes shall be given special care in installation as they are more susceptible to damage than other types of rope. NOTE: The rope design factors, as given in paras. 6-1.3.2, 6-1.3.3, and 6-1.3.4 above, shall be determined on the basis of rope loads resulting from rated loads, specified reeving, and published nomi- nal breaking strength of new rope. Consideration shall be given to frictional losses where appropriate. Ropes of material other than steel may be used only in accordance with the manufacturer’s, or a qualified person’s, recommendation. 6-1.3.5 Reeving Accessories (a) Poured, swaged, compressed, or wedge socket fit- tings shall be applied as recommended by the rope, derrick, or fitting manufacturer. Any new poured socket orswaged socketassemblyused as a boompendantshall be proof tested to the crane or fitting manufacturer’s recommendation, but in no case greater than 50% of the nominal strength of the component wire ropes, struc- tural strands, or fittings. (b) Rope end shall be anchored to the drum. (c) Eyes shall be made in a recommended manner, and rope thimbles should be used in the eye. (d) Rope clips attached with U-bolts shall have the U-bolt on the dead or short end of the rope. Spacing and number of all types of clips shall be in accordance with the clip manufacturer’s recommendations. Nuts on clip bolts shall be tightened evenly to the manufacturer’s recommended torque. After the initial load is applied to newly installed rope and the rope is under tension, the nuts on the clip bolts should be tightened again to the required torque in order to compensate for any decrease in rope diameter caused by the load. (e) Where a half-wedge socket is used, it shall be of a positive-locking type.
