LGH Technical User Guide - Page 150



Pre Lift Guide
TECHNICAL INFO
AREA PREPARATION
• The location for landing the load has been selected
and prepared
• Blocking or cribbing is available to set the load on
• A travel path has been determined and cordoned off
• Other personnel in the area have been notified of the lift
CRANE CONSIDERATIONS (Mobile Cranes)
• Is the lift within the crane’s rated capacity
(boom height/radius)?
• Have boom deflections been considered?
• Have any potential crane boom obstructions been identified?
• What are the limits on wind speed for making this lift?
• Have the ground bearing support conditions been met?
• Power lines in the area? Clearance and a
spotter established?
• Counterweight swing area of the crane barricaded?
Hoisting Guide
PRIOR TO THE LIFT
• The rigging has been inspected before use
• The crane hook is positioned directly over the load’s centre
of gravity
• Softeners are used to protect the rigging where it could
be damaged
• The slings and rigging hardware positioned correctly?
• Rigging provides positive control of the load?
(no slipping/shifting)
• Safe load paths have been established
• Tag lines are being used to control the load
(where appropriate)
• Communications between signalperson and crane
operator have been established
Basic
Hitches
Basic Hitches
ACRA Enterprises, Inc. 800-992-0689 www.acratech.com
VERTICAL
eye & eye
endless
CHOKER
Working Load
Limits shown on
sling tags and
other charts are
based on the
angle of choke to
be 120 degrees
or greater.
BASKET
120°
Working Load Limits shown on sling tags and other
charts are based on both legs being vertical within 5
degrees.
90°
90°
-- Page 6 --
Page 5 -Hitch--Reductions
VERTICAL
CHOKER
BASKET
10,000 kg
WLL
7,500 kg
WLL
20,000 kg
WLL
VERTICAL
When angles, a smaller D/d ratios, or a tight
choke is used, the capacity of the hitch is MUCH
LESS than what is shown on the tag!
2 slings @ 30 degrees horizontal angle
120°
100%
50% reduction
CHOKER
120°
29°
90°
100%
49%
87%
BASKET
Low horizontal angles
the hitch capacity!
60°
90°
100%
87%
©2016 ACRA Enterprises, Inc - all rights reserved
150 Safety, Certainty, Great Service
Web / Roundsling
PERSONNEL
• The roles, responsibilities and qualifications for personnel
have been defined (P.I.C., Riggers, Signalperson, Crane
Operator, etc.)
• A pre-lift meeting has been held with all personnel
AFTER THE LIFT
• A post-lift inspection performed on the load and rigging
(in the locations subjected to forces applied from the lifting
and/or near softeners or where slings came in physical
contact with the load)
• A post-lift meeting is held (if applicable)
• Rigging equipment stored appropriately in proper location(s)
Chain Sling
RIGGING
• Determine the additional tensions based on the sling angles
• Ensure all rigging has adequate capacity for the
additional tension
• Are shackles correctly sized for the sling eyes?
D/d requirements met?
DURING THE LIFT
•T
ension is gradually applied to the slings and rigging
is re-checked
• Lift and hold the load to verify the centre of gravity and
load stability
• Personnel are not under the load or travel path (includes
hands/feet)
• Personnel avoid being in the ‘line of re’ of tensioned rigging
• Lifted load is kept as close to the ground as possible
• Loads lifted high require extra distance for personnel
(potential for the load to swing or bounce if rigging fails
and the load falls)
Wire rope / Web Sling
LOAD
• Weight and centre of gravity has been determined
• Anything inside/outside the load that could shift during the lift?
• Determine if the load needs protection against damage
from the rigging
• All anchor bolts, hold downs, or fasteners have been removed
• Potential for binding - are load cells required to verify the
load is free?
• Attachment points designed to take the load weight
• Is the load structurally capable of being lifted?
(bending/twisting issues)
30°
50%
v5 - 5/16





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