ASME B30.7-2001
repetitive pickup point: when operating on a short
cycle operation, the rope being used on a single layer
and being spooled repetitively over a short portion of
the drum.
rope: refers to wire rope unless otherwise specified.
rope, rotation resistant: a wire rope consisting of an
inner layer of strands laid in one direction covered by
a layer of strands laid in the opposite direction; this
has the effect of counteracting torque by reducing the
tendency of the finished rope to rotate.
service, heavy: that service which involves operation
within the rated load limit which exceeds normal service.
service, normal: that distributed service which involves
operation with randomly distributed loads within
the rated load limit, or uniform loads less than 65%
of rated load for not more than 25% of the time.
service, severe: that service which involves normal
or heavy service with abnormal operating conditions.
spooling, rope: winding of rope on a cylindrical drum
in evenly spaced, uniform layers.
swing: rotating of a boom structure for movement of
loads in a horizontal arc about the axis of rotation.
swingers, attached: a reversible drum unit arranged
to rotate or swing a derrick mast and boom, or some
other structure which supports a load lifting or lowering
boom and which is attached to and receives its power
from a hoist (see Fig. 2).
swingers, independent: a unit directly geared to its
own power for rotating or swinging a derrick mast and
boom (see Fig. 3).
swingers, rope: a unit provided, with one or two
reversible drums for winding the rope used for rotating
or swinging a bull wheel of a boom supporting structure.
switch: a device for making, breaking, or changing
the connections in an electric circuit.
switch, limit: a switch that is operated by some part
of a power driven machine or equipment to alter
the electric circuit associated with the machine or
equipment.
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ASME B30.7-2001repetitive pickup point: when operating on a shortcycle operation, the rope being used on a single layerand being spooled repetitively over a short portion ofthe drum.rope: refers to wire rope unless otherwise specified.rope, rotation resistant: a wire rope consisting of aninner layer of strands laid in one direction covered bya layer of strands laid in the opposite direction; thishas the effect of counteracting torque by reducing thetendency of the finished rope to rotate.service, heavy: that service which involves operationwithin the rated load limit which exceeds normal service.service, normal: that distributed service which involvesoperation with randomly distributed loads withinthe rated load limit, or uniform loads less than 65%of rated load for not more than 25% of the time.service, severe: that service which involves normalor heavy service with abnormal operating conditions.spooling, rope: winding of rope on a cylindrical drumin evenly spaced, uniform layers.swing: rotating of a boom structure for movement ofloads in a horizontal arc about the axis of rotation.swingers, attached: a reversible drum unit arrangedto rotate or swing a derrick mast and boom, or someother structure which supports a load lifting or loweringboom and which is attached to and receives its powerfrom a hoist (see Fig. 2).swingers, independent: a unit directly geared to itsown power for rotating or swinging a derrick mast andboom (see Fig. 3).swingers, rope: a unit provided, with one or tworeversible drums for winding the rope used for rotatingor swinging a bull wheel of a boom supporting structure.switch: a device for making, breaking, or changingthe connections in an electric circuit.switch, limit: a switch that is operated by some partof a power driven machine or equipment to alterthe electric circuit associated with the machine orequipment.6
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