MRTA8-DC3: #35121AUS
Rev 5.0/2-21
14
INTENDED USE
L
OAD
C
HARACTERISTICS
Do NOT lift explosives, radioactive
substances or other hazardous materials.
Make sure the vacuum lifter is intended
to handle each load according to these
requirements:
• The load weight must not exceed the Maximum Load Capacity.
• The load must be a single piece of relatively nonporous material with a flat and
relatively smooth contact surface.
1, 2
To determine whether the load is too porous or
rough, perform the
“Lifter/Load Compatibility Test”
.
• The load's contact surface must be able to obtain a friction coefficient of 1 with the lifter's
vacuum pads (see
“Pad-to-Load Friction Coefficient”
). Otherwise, the capacity should be
derated appropriately.
• The load's surface temperature must not exceed the Operating Temperatures.
3
• The load's
minimum
length and width are determined by the current Pad Spread
(see “SPECIFICATIONS”).
• The load's
maximum
length and width are determined by its allowable overhang.
4
• 1½" [3.8 cm] is the allowable thickness at Maximum Load Capacity.
5
The load must
be positioned correctly on the lifter and either tilt locks or latches, if present, must
be used when appropriate (see “OPERATION”). If not, the allowable load thickness would
be reduced.
6
Note: Standard vacuum pads can stain or deform load surfaces with light colors or soft coatings.
Test such surfaces for damaging effects before using the lifter on them.
7
1..... Although concave vacuum pads can also attach to some curved loads, curvature can reduce lifting capacity. Contact WPG for more information.
2..... A “single piece” of material includes curtainwall assemblies, unitized glazing systems and similar construction units.
3..... Vacuum pads made from a heat-resistant rubber compound can enable you to lift loads with higher surface temperatures. Contact WPG or an
authorized dealer for more information.
4..... The allowable overhang is the amount of load material that can extend sideways beyond the vacuum pad without breaking or otherwise being
damaged. This depends on the load material, its thickness, and the angle of handling (if any). Since every material has different physical
properties, the allowable overhang must be evaluated separately for each load type. Contact WPG or an authorized dealer for more
information.
5..... However, the allowable thickness increases as load weight decreases. Contact WPG for more information.
6.....
Pad Spacers can reduce the stability of upright loads and allowable load thickness.
Contact WPG for more information.
7..... Alternative rubber compounds are available for these purposes. Contact WPG or an authorized dealer for more information.
