Manitowoc 2250 MAX-ER 2000, Руководство оператора

Страница: 38 / 196

Reference
Only
SAFETY INFORMATION 2250 MAX-ER 2000 OPERATOR’S MANUAL
2-14
Published 01-08-13, Control # 049-05
Multiple Load Line Operation
Multiple load line operation is becoming common practice for
applications like panel tilt-up, pile tilt-up, pile driving, rolling
fabricated sections, etc. The multiple lines may be on a
common shaft (each with different parts of line) or on multiple
shafts (lower boom point and upper point, boom point and
fixed jib point, etc).
Manitowoc authorizes multiple load line operation for those
applications requiring it, provided the following steps are
performed:
1. The qualified lift planner and the crane operator shall
r e a d a n d b e c o m e t h o r o u g h l y f a m i l i a r w i t h t h e
a p p r o p r i a t e C a p a c i t y C h a r t s a n d W i r e R o p e
Specification Charts.
2. The lift planner and the crane operator shall make sure
the total load does not exceed the rated capacity given in
the Capacity Chart and Wire Rope Specification Chart
for given boom point or jib point, whichever is less.
EXAMPLE: If one load line is lifting from the jib point, the
proper jib chart applies.
3. The crane shall be thoroughly inspected by a qualified
person prior to setup.
4. The crane shall be thoroughly inspected for load line
interference caused by routing and reeving of multiple
load lines. If interference is found, it shall be eliminated.
5. For cranes produced before 2003, Rated Capacity
Indicators/Limiters were not required by ASME B30.5 for
non-personnel lifting.
To aid the operator in staying within the crane's Capacity
C h a r t w i t h t h e t o t a l a p p l i e d l o a d , M a n i t o w o c
recommends that its cranes be equipped with Rated
Capacity Indicators/Limiters to monitor the load on each
load line.
Operator is still responsible for knowing load and
radius whether or not crane is equipped with load
indicator(s).
6. Manitowoc recommends that each load line be equipped
with an anti two-block device.
7. Manitowoc’s Capacity Charts are based on freely
suspended loads. To prevent side load damage to the
boom, the jib, and the sheaves:
• The load lines must hang as close to vertical as
possible to minimize side and forward loads.
The distance between the load points and the hook
points must be a minimum of three times the
horizontal distance between the hook point on the
load being lifted.
• The load must remain centered on the boom and jib
point shafts unless special lift approval is granted by
Manitowoc.
• The load lines should be located over the load’s
center of gravity as it is supported on a trailer, a
barge, or the ground.
8. The crane operator must be familiar with the operational
characteristic of the crane as it relates to multiple drum
operation (simultaneous operation, same or opposite
direction, or individual operation).
9. When using tandem drums, the maximum operating
layers may be limited depending on whether the crane
was initially designed for tandem drum operation or not.
10. Load shift when lifting with two hooks may be more
unpredictable than typical one hook lifting.
Holding Load
When a load is suspended, the operator shall take the
following precautions:
1. Not leave his/her position at the controls.
2. Not allow personnel to stand or pass under the load.
3. Move all controls to off, apply all drum brakes, engage
the boom hoist pawl, and apply the swing and travel
brakes or locks.
SIGNALS
1. Continuous communication shall be maintained
between the operator and the signal person during all
crane movements. If communication is disrupted,
operator shall stop all crane movements.
2. Signals to the operator shall be in accordance with the
standard signals shown in Section 3, unless
communications equipment (telephone, radio, etc.) is
used.
3. All signals shall be easily understood by the operator at
all times. The operator shall not respond to any signal
which is not clearly understood.
4. For operations not covered in the standard signals, or for
special situations or emergencies, additional signals
may be required. In those cases, the signals used shall
WARNING
Avoid Over Load and Side Load Damage to Crane
Manitowoc highly recommends that you contact your
Manitowoc dealer for lift planning assistance and
approval.