Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-24 - General safety and health standards › Part D - MATERIALS HANDLING AND STORAGE, INCLUDING CRANES, DERRICKS, ETC., AND RIGGING › Handling and Storage-Cranes, Derricks, Etc › Section 296-24-24501 - Definitions

Current through Register Vol. 24-14, July 15, 2024
A-frame derrick.
A derrick in which the boom
					 is hinged from a cross member between the bottom ends of two upright members
					 spread apart at the lower ends and joined at the top; the boom point secured to
					 the junction of the side members, and the side members are braced or guyed from
					 this junction point.
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A-FRAME
ANSI.
The American National Standards
					 Institute.
Appointed.
Assigned specific responsibilities
					 by the employer or the employer's representative.
Basket derrick.
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. The load is raised and lowered by
					 ropes through a sheave or block secured to the top of the pole.
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BASKET
Boom.
A timber or metal section or strut,
					 pivoted or hinged at the heel (lower end) at a location fixed in height on a
					 frame or mast or vertical member, and with its point (upper end) supported by
					 chains, ropes, or rods to the upper end of the frame mast, or vertical member.
					 A rope for raising and lowering the load is reeved through sheaves or a block
					 at the boom point. The length of the boom must be taken as the straight line
					 distance between the axis of the foot pin and the axis of the boom point sheave
					 pin, or where used, the axis of the upper load block attachment pin.
Boom harness.
The block and sheave arrangement
					 on the boom point to which the topping lift cable is reeved for lowering and
					 raising the boom.
Boom point.
Is outward end of the top section
					 of the boom.
Breast derrick.
A derrick without boom. The
					 mast consists of two side members spread farther apart at the base than at the
					 top and tied together at top and bottom by rigid members. The mast is prevented
					 from tipping forward by guys connected to its top. The load is raised and
					 lowered by ropes through a sheave or block secured to the top
					 crosspiece.
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BREAST
Chicago boom derrick.
A boom which is attached
					 to a structure, and outside upright member of the structure serving as the
					 mast, and the boom being stepped in a fixed socket clamped to the upright. The
					 derrick is complete with load, boom, and boom point swing line falls.
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CHICAGO BOOM
Derrick.
An apparatus consisting of a mast or
					 equivalent member held at the head by guys or braces, with or without a boom,
					 for use with a hoisting mechanism and operating ropes.
Derrick bullwheel.
A horizontal ring or wheel,
					 fastened to the foot of a derrick, for the purpose of turning the derrick by
					 means of ropes leading from this wheel to a powered drum.
Designated.
Selected or assigned by the
					 employer or employer's representative as being qualified to perform specific
					 duties.
Eye.
A loop formed at the end of a rope by
					 securing the dead end to the live end at the base of the loop.
Fiddle block.
A block consisting of two
					 sheaves in the same plane held in place by the same cheek plates.
Foot bearing
or
foot block (sill
					 block)
. The lower support on which the mast rotates.
Gin pole derrick.
A derrick without a boom.
					 Its guys are so arranged from its top as to permit leaning the mast in any
					 direction. The load is raised and lowered by ropes reeved through sheaves or
					 blocks at the top of the mast.
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GIN POLE
Gudgeon pin.
A pin connecting the mast cap to
					 the mast allowing rotation of the mast.
Guy.
A rope used to steady or secure the mast
					 or other member in the desired position.
Guy derrick.
A fixed derrick consisting of a
					 mast capable of being rotated, supported in a vertical position by guys, and a
					 boom whose bottom end is hinged or pivoted to move in a vertical plane with a
					 reeved rope between the head of the mast and the boom point for raising and
					 lowering the boom, and a reeved rope from the boom point for raising and
					 lowering the load.
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GUY
Load block, lower.
The assembly of sheaves,
					 pins, and frame suspended by the hoisting rope.
Load block, upper.
The assembly of sheaves,
					 pins, and frame suspended from the boom.
Load, working.
The external load, in pounds,
					 applied to the derrick, including the weight of load attaching equipment such
					 as load blocks, shackles, and slings.
Mast.
The upright member of the
					 derrick.
Mast cap (spider).
The fitting at the top of
					 the mast to which the guys are connected.
Reeving.
A rope system in which the rope
					 travels around drums and sheaves.
Rope.
Refers to wire rope unless otherwise
					 specified.
Safety hook.
A hook with a latch to prevent
					 slings or load from accidentally slipping off the hook.
Shearleg derrick.
A derrick without a boom and
					 similar to a breast derrick. The mast, wide at the bottom and narrow at the
					 top, is hinged at the bottom and has its top secured by a multiple reeved guy
					 to permit handling loads at various radii by means of load tackle suspended
					 from the mast top.
Side loading.
A load applied at an angle to
					 the vertical plane of the boom.
Sill.
A member connecting the foot block and
					 stiffleg or a member connecting the lower ends of a double member mast.
Standby derrick.
A derrick not in regular
					 service which is used occasionally or intermittently as required.
Stiff leg.
A rigid member supporting the mast
					 at the head.
Stiffleg derrick.
A derrick similar to a guy
					 derrick except that the mast is supported or held in place by two or more stiff
					 members, called stifflegs, which are capable of resisting either tensile or
					 compressive forces. Sills are generally provided to connect the lower ends of
					 the stifflegs to the foot of the mast.
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STIFF LEG
Swing.
Rotation of the mast and/or boom for
					 movements of loads in a horizontal direction about the axis of
					 rotation.
Order 73-5, § 296-24-24501, filed 5/9/73 and Order
						73-4, § 296-24-24501, filed 5/7/73.