ASME B30.6-2020 pdf download

ASME B30.6-2020 pdf download.Derricks.
6-1.3.4 Load Hoist Ropes
(a) Load hoist ropes shall be of a size, grade, and construction to withstand the maximum load imposed.
(b) Ropes in the load-hoisting systems shall be of a length for the entire range of movement specified for the application with at least two full wraps of rope remaining on the drum.
(c) The minimum breaking force of the most heavily loaded rope in a system shall not be less than 31/2 times the load applied to that rope, except as specified in (d).
(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 through 6-1.3.4, shall be determined on the basis of rope loads resulting from rated loads, specified reeving, and published minimum breaking force 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 fittings shall be applied as recommended by the rope, derrick, or fitting manufacturer. Any new poured socket or swaged socket assembly used as a boom pendant shall be proof tested to the derrick or fitting manufacturer’s recommendation but in no case greater than 50% of the minimum breaking force of the component wire ropes, structural 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.
U) Wire rope clips used in conjunction with wedge sockets shall be attached to the unloaded dead end of the rope only. Refer to ASME 1330.26, Chapter 3,
Section 26-3.1.4, and Figure 26-3.1.1-2 for a more complete instruction in the use of wedge sockets.
(g) If a load is supported by more than one part of rope, the tension in the parts shall be equalized.
6-1.3.6 Sheaves
(a) Sheave grooves shall be smooth and free from surface conditions that could cause rope damage or accelerated rope wear. The cross-sectional radius at the bottom of the groove should be such as to form a close-fitting saddle for the size rope used, and the sides of the groove should be tapered outward to facilitate entrance of the rope into the groove. Flange corners should be rounded, and the rims should run true about the axis of rotation.
(b) Sheaves carrying ropes that can be momentarily unloaded shall be provided with close-fitting guards or other devices to guide the rope back into the groove when the load is applied again.
(c) The sheaves in the lower load block should be equipped with close-fitting guards that will reduce the possibility of ropes becoming fouled when the block is lying on the ground with the ropes loose.
(d) Means should be provided, if necessary, to prevent chafing of the ropes.
(e) All running sheaves shall be equipped with means for lubrication or with permanently lubricated, sealed, or shielded bearings.
(() Hoisting sheaves shall have pitch diameters not less than 18 times the nominal diameter of the rope used.
(g) Boom point sheaves should be provided with guides to limit the offlead angle of the rope when entering the grooves from either side.