ASME B30.6 pdf download

ASME B30.6 pdf download.Derricks.
Volume B30.6 includes provisions that apply to the construction, installation, operation, inspection, testing, and maintenance of guy. stiffleg, basket, breast, gin pole, Chicago boom, shearleg, and A-frame derricks. These derricks, powered by winches through systems of wire rope reeving, are used for lifting, lowering, and hon. zontal movement of freely suspended unguided loads. Derricks are usually stationary mounted and may be temporarily or permanently installed. The provisions included in this Volume also apply to any variations of these types of derricks with the same fundamental characteristics, except those specified for floating derricks in ASME B30.8, Floating Cranes and Floating Derricks.
SECTiON 6-0.2: DEFINITIONS
(15) 6-0.2.1 Types of Equipment
derrick: an apparatus consisting of a mast or equivalent member held at the end by guys or braces, with or without a boom, for use with a winching mechanism and operating ropes.
derrick, A-frame: a derrick in which the boom is hinged from a cross member or pedestal between the bottom ends of two upright members spread apart at the lower ends and joined at the top, the boom point is secured to the junction of th side members, and the side members are braced or guyed from this junction point (see Fig. 6-0.2.1-1).
derrick, basket: a derrick without a boom, similar to a gin pole, with its base supported by ropes attached to corner posts or other parts of the structure. The base is at a lower elevation than its supports. The location of the base of a basket derrick can be changed by varying the length of the rope supports. The top of the pole is secured with multiple reeved guys to position the top of the pole to the desired location by varying the length of the upper guy lines.
NOTE: The rope design tadon, as given in paras. 6-1.3.2 through 6-1.3.4 above, 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 fñctional lasses 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 hut 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.
(f) Wire rope clips used in conjunction with wedge sockets shall be attached to the unloaded dead end of the rope only. Refer to ASME B30.26, Chapter 3, Section 26-3.1.4, and Fig. 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 closefitting saddle for the size rope used.