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Rigging
& Lifting Metal Enclosed
Capacitor Banks
Introduction
Due
to size, Northeast Power Systems, Inc. (NEPSI) metal enclosed
capacitor banks and harmonic filter banks are often shipped
on a flatbed trailer to their final destination. These banks
are typically off-loaded with either a forklift or crane,
which is usually dependent on their size and/or weight.
A
contractor with access to the proper equipment and expertise
is typically hired to rig and lift the bank into place and
perform the installation when in-house expertise and equipment
is not available. Rigging and hoisting the bank into place
is a simple matter, with the technical details typically left
to the contractor.
This
technical note provides a basic overview of rigging and hoisting
NEPSI's metal enclosed banks with a forklift or a crane and
recommends actions that can be taken to ensure the safety
of personnel and equipment. Since a crane is commonly used
and is more complex than a forklift in terms of rigging and
hoisting, crane use and the associated rigging is discussed
in greater detail.
This
technical note is not intended to serve as a complete guide
to rigging and hoisting. Federal, state, and local regulations
must be complied with, which are beyond the scope of this
technical note. Only qualified personnel who have adequate
training in the operation and use of rigging and lifting equipment
should perform these operations.
How NEPSI's Equipment
is Shipped
NEPSI's
capacitor and harmonic filter banks are shipped on wood supports,
called dunnage, (usually 4” x 4”) or are placed directly on
the bed of a flatbed trailer (see pictures below). This is
primarily dependent on the size and weight of the equipment,
with larger banks being placed directly on the bed of the
truck. All banks are chained and strapped to the trailer,
and then fully tarped.
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Picture
above shows multiple NEPSI banks on a flat-bed truck
prior to securing and tarping. These banks are placed
on wood dunnage for ease of off-loading by either a
forklift or crane.
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Above
picture shows a NEPSI bank, prior to securing and tarping,
placed directly on the bed of a truck (no dunnage).
A crane is usually required for hoisting these larger
units.
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Lifting and Offloading
With a Forklift
Lifting
and offloading NEPSI's capacitor and harmonic filter banks
from a flatbed or covered van with a forklift is a common
and relatively simple task. When using a forklift, keep these
points in mind:
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Only
qualified, trained, and experienced operators should use
a forklift. Many of these requirements are contained in
OSHA regulation 29 CFR 1910.178.
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Make
sure the forklift has adequate lift capacity (refer to
equipment nameplate). Forklift equipment is rated for
a maximum lifting capacity at the load center on the forks.
If the weight center of the load is further out on the
forks, lifting capacity is reduced. Charts showing load
capacity versus weight center distance are usually posted
on the forklift.
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Survey
the path the forklift will take, look for terrain conditions
or obstacles that pose a safety risk. Use extreme caution
on grades or ramps.
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Prior
to lifting or transporting the equipment, forks should
be spread as wide apart as practical. “Square up” to the
load. The forks should extend completely under the equipment,
with the load as far back on the forks as possible. Lift
the equipment just high enough to clear the trailer. The
back wheels of the forklift should be in firm contact
with the ground, if not lift capacity may have been exceeded.
Make sure the equipment is stable, and then tilt the mast
back for better stability.
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Once clear of the trailer, immediately lower the equipment
to the lowest height possible while still maintaining
enough clearance above the ground for driving (2-6 inches).
Do not raise or lower the load while you are traveling.
Go slow as rough terrain can causing bouncing which can
lead to dynamic load conditions that may exceed your forklift
capacity.
Rigging and Hoisting
With a Crane
Planning
& Safety
Before
the capacitor or harmonic filter bank equipment arrives on-site,
it is important to consider and plan for the following:
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Conduct
a site survey to access safety concerns and ensure there
are not any restrictions or conditions that may impede
the use of a crane. Before the crane arrives, determine
where it will sit and where it will travel. Look for overhead
lines and structures and ensure adequate clearance. See
table below for minimum clearances for power lines. This
clearance applies to all areas around the power line,
above, below, and to either side. Note rough terrain conditions
such as ditches, trenches, excavations, holes, rises,
and railroad tracks.
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| Up
to 50 kV |
10
feet |
| 50kV
to 75kV |
11
feet |
| 75kV
to 125kV |
13
feet |
| 125kV
to 175kV |
15
feet |
| 175kV
to 250kV |
17
feet |
| 250kV
to 370kV |
21
feet |
| 370kV
to 550kV |
27
feet |
| 550kV
to 1000kV |
42
feet |
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Be
aware of underground vessels and storage tanks that may
pose a risk for heavy equipment.
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If
a crane will be used, determine how close the crane can
get to the equipment to be hoisted. As the horizontal
reach of a crane increases, crane capacity decreases rapidly.
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Most
cranes companies charge by the hour with a minimum of
two to four hours (for budgeting purposes, assume $400
to $600). Others may charge for an entire day regardless
of time actually spent. Charges are typically based on
crane time from port-to-port, so select a reputable company
that is local and keep track of your equipment while it
is in transit to minimize unforeseen delays.
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In
general, NEPSI provides the trucker delivering the equipment
with customer contact information. NEPSI can inform
the driver to contact the customer 24 or 48 hours in advance
to help crane scheduling. It is important that this request
be made to NEPSI on the equipment purchase order or prior
to shipment.
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To
minimize crane cost and unanticipated delays, NEPSI recommends
that the customer monitor the shipment once it has left
our manufacturing site. NEPSI provides trucking company
contact information and when available the mobile phone
number of the driver that will deliver the equipment.
NEPSI provides the best estimate of when the equipment
will arrive, but due to circumstances beyond our control
(e.g., weather, traffic), delays can occur.
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In order to minimize crane charges, provide NEPSI drawings
of the equipment to be lifted prior to the crane arriving
on site. NEPSI provides drawings with various views, including
lift points, weight, and dimensional information. Providing
these in advance will help ensure that a crane and rigging
equipment of the correct capacity arrives.
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Lift equipment slightly off ground until slings are taunt,
examine rigging (shackles or hooks, lifting eyes, wire
rope) to ensure there are no problems. Visually examine
for structural damage. Always know….never guess. No one
should be positioned under a suspended load. Use tag or
guy lines to guide the unit into position.
Basic
Rigging
Equipment
The
following are some definitions and pictures related to rigging
and rigging hardware. All rigging hardware has a rated capacity
that must not be exceeded.
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Lifting
Eye – a
point of attachment on the enclosure, having a looped
head designed to accommodate a shackle or hook. Above
picture shows removable lifting eye and chain used to
secure the equipment on a flat-bed truck.
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Shackle
and Hook– Both
a type of clevis normally used for lifting. Above picture
at left shows screw pin anchor shackle fastened through
lifting eye, with wire rope sling. A hook with a throat
latch is shown in above right picture.
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Spreader
Bar- Often
adjustable, a frame, forming part of the boom suspension,
used to assist in rigging a load. Picture above shows
two adjustable spreader bars with wire rope slings and
shackles.
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Wire
Rope Slings – Made
from various grades of steel, used to secure load. Synthetic
web slings are also be used.
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Typical Rigging
Configurations
The
pictures below show rigging configurations that are typically
utilized when lifting NEPSI capacitor and harmonic filter
banks with a crane. The rigging configuration used is usually
determined by the crane operator.
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Above
pictures show rigging hitch utilizing two adjustable
spreader bars with straps (top picture) and wire cable
sling (bottom picture) connected to each of the lifting
eyes located at the bottom corners of the enclosure.
Note protective pad used above each lifting eye to keep
the wire rope away from the enclosure to prevent paint
scratching and sling damage.
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Above
picture shows rigging hitch utilizing a single adjustable
spreader bar and wire cable sling connected to each
of the lifting eyes located at the bottom corners of
the enclosure.
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Conclusion
Rigging
and lifting NEPSI metal enclosed capacitor and harmonic filter
banks with a forklift or a crane is a simple matter, but should
only be performed by qualified individuals. Planning in advance
of equipment arrival can minimize costs involved and reduce
the risk to personnel and equipment.
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Northeast
Power Systems, Inc.
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66
Carey Road
Queensbury, New York 12804 |
| Phone:
518-792-4776 |
| Fax:
518-792-5767 |
| E-mail:
sales@nepsi.com |
| Website: www.nepsi.com |
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