Howard HI-104 Single-Phase Pad Transformer - Manual (Page 9)

Document 2.4.96, Revision 0
March, 2013
9
Single-Phase Pad-Mounted Compartmental-Type Distribution Transformers
Lifting and Handling
Lifting lugs or bosses are provided to lift the
completely assembled transformer. All lifting lugs
or bosses must be used simultaneously to provide
a safe, balanced lift. The transformer must not be
lifted from any points other than the provided lifting
lugs or bosses. Do not use holes in the lifting hooks
for lifting. These holes are for tie-down purposes
only and are not suitable for lifting. Refer to the
transformer nameplate to determine the total weight
of the assembled transformer.
Lifting bosses, when provided, consist of 5/8”-11
threaded inserts. Lifting should be accomplished
with user-installed 5/8”-11 lifting bolts that have
been fully engaged into the threaded bosses and
hoist rings. Do not lift with lifting bolts alone. Lifting
bolts and hoist rings must be rated to safely support
the weight of the completely assembled transformer.
A spreader bar should be used to keep the lifting
cables or straps nearly vertical, enabling a safe lift
and reducing the likelihood of tank deformation or
damage to painted surfaces. Transformers should be
lifted in an upright position, allowing the transformer
to tilt no more than 15 degrees from vertical. Lifting
cables or straps should be no more than 20 degrees
from vertical.
Single-door style transformers may also be lifted
with a forklift truck of adequate lifting capacity to
safely handle the weight of the completely assembled
transformer. Forks should be of sufficient length to
extend completely through the shipping pallet or
runners. Transformers should be lifted with the tank
(core/coil and fluid compartment) oriented toward the
forklift truck, so that the transformer center of gravity
is adequately supported. Lifting transformers from
the terminal compartment side is not safe, as the
transformer may tip and fall.
Lifting double-door style transformers with a forklift
truck is not recommended, since weight and balance
can be problematic, and radiator panels can be easily
damaged.
Transformers should be handled with special care
when the ambient temperature is below minus 20°C
(minus 4°F); otherwise, permanent damage to the
transformer may result.
▲
! WARNING
FAILURE TO FOLLOW THE INSTRUCTIONS BELOW
COULD RESULT IN DEATH OR SERIOUS PERSON-
AL INJURY AND COULD ALSO RESULT IN DAM-
AGE TO THE EQUIPMENT.
• Lifting equipment, including forklift trucks,
cranes, cables, straps, lifting bolts, hoist
rings and spreader bars, must be of ad-
equate capacity to safely lift the completely
assembled transformer.
• Keep unnecessary personnel clear while
unloading and moving the transformer.
Jacking, Skidding and Rolling
Double-door style transformers are designed for
jacking, skidding and rolling. Do not use radiator fins,
bushings, valves, pipe fittings, gauges or sheet metal
surfaces for jacking. Jacking must be done using
the proper jacking provisions from two adjacent
corners simultaneously to prevent warping of the
tank bottom. When rolling, use an adequate number
of rollers to distribute the transformer weight evenly.
Refer to the transformer outline drawing for the total
weight of the assembled transformer.
Location and Mounting
Consult local and national codes to ensure that
the installation meets all applicable requirements.
Location of the transformer must permit it to operate
in conditions that meet the requirements specified
in the “Usual Service Conditions” section of IEEE
Standard C57.12.00 General Requirements for
Liquid-Immersed Distribution, Power and regulating
Transformers. Operation not meeting these service
condition requirements will compromise transformer
capacity and reliability, unless the transformer is
designed specifically for operation in conditions
other than usual service conditions. Contact the
Howard Industries Transformer Division, if additional
information is needed about location and mounting
issues not covered by these instructions
The transformer should be mounted on a level
concrete foundation or other suitable surface, which
is rated to support the weight of the completely
SECTION 3: INSTALLATION