steel distribution - steel market development institute/media/files/smdi/construction/upoles -...
TRANSCRIPT
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What Every Lineman Should Know
SteelDistribution Poles
SteelDistribution Poles
What Every Lineman Should Know
What Every Lineman Should Know
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Steel Distribution Pole DisclaimerSteel Distribution Pole Disclaimer•The material presented in the course and accompanying electronic and written presentations has been developed by a joint effort of the American Iron and Steel Institute, Omaha Metropolitan Community College, and EDM International, Inc. These organizations have made a diligent effort to present accurate, reliable, and useful information regarding the use of steel distribution poles.
•We believe that the material presented in the DVD and accompanying electronic and written presentations reasonably reflects the present state of knowledge as to the subject, as it is generally known, but we do not warrant this or claim that such material is entirely accurate or complete. And we do not accept any obligation to issue supplements to or corrections or the material in the event of errors being discovered or advances being made in the techniques discussed in the material. Thus, all users of the material should have the assistance of, and rely on, their own experts in the design, construction and maintenance of steel distribution poles
•The material presented in the DVD and accompanying electronic and written presentations are for general information only. It is not a substitute for competent professional advice. Persons making use of the information set forth herein do so at their own risk and assume any and all liability arising therefrom.
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Course OutlineCourse Outline
• What is a steel pole?• How can they be used?• What are the differences
between steel poles and wood poles?
• What is needed for inspection and maintenance of steel poles?
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Why Steel Poles?Why Steel Poles?
• Dimensional consistency• Light weight • Dependable strength• Improvements in
manufacturing technology• Ease of disposal• Range of sizes, strength• Lineman safety: no concern
for climbing a decayed or woodpecker-infested pole
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ManufacturingManufacturing
• Consistency• Controlled environment• Uniform weight• Recycled materials
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Single Pole TangentsSingle Pole Tangents
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Single Pole TangentsSingle Pole Tangents
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Single Pole DeadendsSingle Pole Deadends
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Guyed PolesGuyed Poles
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Tapered and TubeTapered and Tube
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ShippingShipping• Shipped via truck or rail to service yard• # of poles per load is generally governed by
volume, not weight• Cribbing is used to protect finish
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HaulingHauling
Haul to pole site in similar manner as for wood poles
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HandlingHandling
• At least 30 percent lighter than wood poles• Handle using nylon straps or rope• Typically lifted using a single point pick up
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HandlingHandling• And . . . when necessary:
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StorageStorage• Place on cribbing, keep off the ground• Space so poles have no contact with each other• No need to rotate when stored long-term • Poles with below grade coating should NOT be stored long
term unless rotated or covered. UV can have a negative effect on coating exposed to prolonged horizontal exposure.
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Coatings: Above Ground ProtectionCoatings: Above Ground Protection• Hot-dipped galvanizing• Metalizing• Zinc silicate• Painting • Self-weathering steel
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Galvanized vs. Weathering SteelGalvanized vs. Weathering Steel
• Different chemistries • Same pole strengths,
dimensions• Galvanizing is sacrificial
coating• Weathering steel provides
own barrier coating
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Galvanized vs. Weathering SteelGalvanized vs. Weathering Steel
• Color difference: Galvanizing is grey and
dulls with age Weathering steel turns to
an even dark brown
• Galvanized poles are vented• Weathering steel may be
sealed
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Coatings: Below-Ground ProtectionCoatings: Below-Ground Protection• Urethane• Epoxy• Bituminous coating (Bitumastic)• Wraps
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Corrosion ProtectionCorrosion Protection
Ground Line
Soil
Steel Pole
Polyurethane Coating
Corrosion Zone
Sacrifical Zinc Coating
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Hot Dip GalvanizingHot Dip Galvanizing
Zinc Coating
Bare Steel
Exposed Steel is Protected
• With a cathodically protective coating, such as galvanized steel, damaged areas will be protected by the surrounding zinc.
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Strength Strength • Vehicle Impact
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Sustainable Sustainable
• Steel is the most recycled material in the world-- More steel is recycled annually than all other materials, including aluminum, glass, and paper combined.
• The US steel industry has reduced its energy intesity/ton of steel shipped by 29% since 1990.
• Greenhouse Gas Emissions: GHG/ton of steel shipped have been reduced by nearly 45% since 1975.
• Every steel pole is made from between 25% and 100% recycled steel – and is 100% recyclable and the end of its long service life.
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Line ConstructionLine Construction
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Framing: Steel Pole CharacteristicsFraming: Steel Pole Characteristics
• Hollow steel members• Consistent dimensions
from pole to pole• Dimensions will not vary
with temperature or moisture
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Framing: HardwareFraming: Hardware• Steel poles can generally
be framed the same as wood
• EXCEPT:• Use gains without cleats• Use manufacturer’s
recommended bolt torques
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Framing: Bolt HolesFraming: Bolt Holes
• Pre-drilled at factory• Field drill using: hole saw stepped bits titanium bit
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Assembly & ErectionAssembly & Erection
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Pole JointsPole Joints
• Longer poles have optionof being multi-furnished asmulti-section poles
• Field assembly is accomplished using: Slip joints Flange joints
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FoundationsFoundations
Direct Embed
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Cross Arms and HardwareCross Arms and Hardware• Same as wood • Through bolts with curved (or flat) washers• Banding can also be used for making attachments• Option of welded attachments for unique
applications
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Line OperationsLine Operations
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BILBIL
• Achieving 300 kV BIL• Single Phase - use 13-14
inch FRP pole top pins• Three Phase - use 8-foot
wood or FRP arm w/13” - 14” pin or 10-foot arm:
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GroundingGrounding• Steel is an excellent conductor• No need to run copper ground wire• Little chance of break in ground• In most installations, every pole is a ground• Grounding preferences vary by utility• Various techniques help ensure proper grounding
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Working Around Energized LinesWorking Around Energized Lines
• Steel pole good conductor• Minimizes voltage gradients along pole• Safer place to work• Good work practices:
Use cover ups or guards Use a dedicated observer Set reclosures to non-
reclosure positions Consider using ground
gradient matting
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Live-line installationLive-line installation
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Climbing Climbing
• Several options available:
Removal steps Removable ladders Permanent steps
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SafetySafety
• Dielectric Shoes
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Climbing Climbing
Removable Step
Bucket Truck
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Work PlatformsWork Platforms
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This DVD was made possible through the support and assistance of: This DVD was made possible through the support and assistance of:
AISI Steel Utility PoleTask Group
---Gary McDonaldUtility Consultant
---Rich Newcomer
Utility Lineman School Director Metropolitan Community College
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Thank You!Thank You!
To learn more…
• Visit linemen.steel.org,• Call (202) 452.7100, or• Email [email protected]