(1)
You must fit every crane with a load indicating device or alternative device in
proper working condition, except as provided in subsection (8) of this section.
The type or model or any load indicating or alternate device which is used
shall provide:
(a) A direct indication in the
cab of actual weight hoisted or a means of determining this by referencing a
weight indication to crane ratings posted and visible to the operator. The use
of a dynamometer or simple scale alone must not meet this requirement;
or
(b) Indications in the cab
according to the radius and load at the moment; or
(c) A direct means to prevent an overload
from occurring.
(2) You
must make sure the accuracy of the devices required by this section must be
such that any indicated load (or limit), including the sum of actual weight
hoisted and additional equipment or "add ons" such as slings, sensors, blocks,
etc., is within the range from no less than ninety-five percent of the actual
true total load (five percent overload) to one hundred ten percent of the
actual true total load (ten percent underload). Such accuracy must be required
over the range of the daily operating variables to be expected under the
conditions of use.
(3) You must
make sure the device permits the operator to determine, before making any lift,
that the indicating or substitute system is operative. In the alternative, if a
device is so mounted or attached to preclude such a determination, it may not
be used unless it has been certified by the manufacturer to remain operable
within the limits stated in subsection (2) of this section for a specific
period of use. Checks for accuracy, using known values of load, must be
performed at the time of every certification survey (see WAC
296-56-60093) and at such
additional times as may be recommended by the manufacturer.
(4) You must make sure when a load indicating
device or alternative system is so arranged in the supporting system (crane
structure) that its failure could cause the load to be dropped, its strength
must not be the limiting factor of the supporting system (crane
structure).
(5) You must make sure
marking is conspicuously placed giving: Units of measure in pounds or both
pounds and kilograms, capacity of the indicating system, accuracy of the
indicating system, and operating instructions and precautions. In the case of
systems utilizing indications other than actual weights, the marking must
include data on: The means of measurement, capacity of the system, accuracy of
the system, operating instructions and precautions. If the system used provides
no read-out, but it is such as to automatically cease crane operation when the
rated load limit under any specific condition of use is reached, marking must
be provided giving the make and model of the device installed, a description of
what it does, how it is operated, and any necessary precautions regarding the
system. All weight indications, other types of loading indications, and other
data required must be readily visible to the operator.
(6) You must make sure all load indicating
devices are operative over the full operating radius. Overall accuracy must be
based on actual applied load and not on full scale (full capacity) load.
Explanatory note: For example, if accuracy of the load
indicating device is based on full scale load and the device is arbitrarily set
at plus or minus ten percent, it would accept a reading between ninety thousand
and one hundred ten thousand pounds, at full capacity of a machine with one
hundred thousand pounds, maximum rating, but would also allow a reading between
zero and twenty thousand pounds, at that outreach (radius) at which the rating
would be ten thousand pounds capacityan unacceptable figure. If, however,
accuracy is based on actual applied load under the same conditions, the
acceptable range would remain the same with the one hundred thousand pound load
but becomes a figure between nine thousand and eleven thousand pounds, a much
different and acceptable condition, at the ten thousand pound
load.
(7)You must make sure
when the device uses the radius as a factor in its use or in its operating
indications, the indicated radius (which may be in feet and/or meters, or
degrees of boom angle, depending on the system used) is a figure which is
within the range of a figure no greater than one hundred ten percent of the
actual radius to a figure which is no less than ninety-seven percent of the
actual (true) radius. A conversion chart must be provided whenever it is
necessary to convert between degrees of radius and feet or meters.
(8) The load indicating device requirements
of this section do not apply to a crane:
(a)
Of trolley equipped bridge type while handling container known to be and
identified as empty, or loaded, and in either case in compliance with the
provisions of WAC
296-56-60103, or while hoisting
other lifts by means of a lifting beam supplied by the crane manufacturer for
the purpose, and in all cases within the crane rating;
(b) While handling bulk commodities or
cargoes by means of clamshell bucket or magnet;
(c) While used to handle or hold hoses in
connection with transfer of bulk liquids or other hose handled products;
or
(d) While the crane is used
exclusively to handle cargo or equipment the total actual gross weight of which
is known by means of marking of the unit or units hoisted, when such total
actual gross weight never exceeds eleven thousand two hundred pounds, and when
eleven thousand two hundred pounds, is less than the rated capacity of the
crane at the maximum outreach that is possible under the conditions of use at
the time.
(9) You must
install limit switches on the main line and whip line assemblies, of all cranes
and derricks, which will deactivate the hoisting power when a load reaches the
upper limits of travel and at such other places as required by this chapter.
Line limit switches must be tested prior to or at the beginning of each shift
to determine if they are functioning properly. Any malfunction must be reported
to the person in charge immediately and must be repaired prior to
use.
