Lightning_Protection_Scope_JW_track_changes.docx
DOCX document 18 KB Posted
- Solicitation number
- 26-P-00192
- Issued by
- Hillsborough County, Florida
About this file
This is a Lightning Protection Scope of Work document for the City of Tampa's McKay Bay Waste to Energy Facility. The project involves installing a comprehensive lightning protection dissipation system across all plant structures, excluding the main exhaust stack. The system will connect to the existing grounding ring, which the contractor must verify for functionality during installation. The scope specifies installation of air terminals across multiple facility areas: 35 air terminals for the Ash Building and Ash Conveyor spaced 20 feet apart; 10 air terminals on cooling tower light fixtures with 7 grounding rods around the perimeter; 19 air terminals on Turbine Island with 2 stanchions extending 9 feet above the upper deck; 7 air terminals on the Storage Warehouse roof; and 50 air terminals (30 for Administration Building, 20 for Tipping Floor) along roof edges and centers at 20-foot intervals. Associated infrastructure includes 6 down conductors for the Ash Building, 4 for the cooling tower, 2 for piping, 6 for Turbine Island, 9 for the Administration and Tipping Buildings, and 4 bonding connections for the Storage Warehouse grounding system.
All lightning protection installation must comply with NFPA 780 and UL 96A standards with specific material requirements mandating stainless steel or bronze components rather than aluminum, Class II air terminals of 24-inch design, and tinned lined copper conductors and connectors. The grounding system must achieve a resistance to earth of no more than 5 ohms, with field measurement and documentation required prior to connecting the lightning protection system. If the existing grounding ring requires replacement during installation, a change order can be issued pending approval from both the City of Tampa and the contractor. No thru-roof penetrations are permitted, and all air terminal base materials, cable holders, bonding lugs, and bonding plates must utilize corrosion-resistant materials consistent with the project specifications.
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Text version
Lightning Protection Scope Scope:
| McKay Bay Waste to Energy facility needs to install lightning protection for all the structures of the plant. The previous lightning protection was damaged and removed from previous hurricanes. Contractor will install a new lightning protection dissipation system that covers all the structures on site excluding the main exhaust stack. The lightning protection will connect to the existing grounding ring with intention that the existing grounding ring will not need to be replaced. However, contractor will have to verify the grounding ring is still functional during installation. If the grounding system needs to be replaced a change order can be issued to cover the fixes if the City of Tampa and contractor approve. |
| Contractor will install lightning protection rods, and grounding cables necessary to connect to the existing grounding ring. Lightning protection installation must comply with NFPA 780 and UL 96A. |
Lightning protection must be installed following these requirements:
1. Air terminals shall be stainless steel in lieu of aluminum.
2. Air terminals shall be Class II in lieu of Class I.
3. Air terminals shall be 24” designed for lightning dissipation and direct strike
4. Conductors shall be Class II tinned lined copper, not aluminum.
5. Air terminal base material shall be bronze or stainless steel, not aluminum.
6. Cable holders shall be tinned lined copper, not aluminum.
7. Bonding lugs shall be bronze, not aluminum.
8. Cable connectors shall be tinned lined copper, not aluminum.
9. Bonding plates shall be bronze, not aluminum.
10. Thru-roof penetrations shall not be allowed.
11. The grounding system shall have a resistance to earth of not more than 5 ohms. The resistance to earth shall be field measured and recorded for each ground system prior to connecting the lightning protection system.
Contractor will install air terminals in the following locations
· Ash Building and Ash Conveyor
· (35) Air terminals placed on top of the (3) roof top units, along the roof center, and along the out perimeter of the ash building
· Air terminals will be spaced 20ft apart
· (4) Air Terminals along the ash conveyor center of the roof
· (6) Ground conductor will be required for the ash building
· Cooling Tower and Piping
· (10) Air Terminals on top of existing pole mounted light fixtures at top of cooling tower
· (4) Down Conductors for the cooling tower
· (7) Ground Rods to be installed around the perimeter of the cooling tower and Staircase
· (10) Air Terminals spread evenly on all of the cooling tower piping
· (2) Down Conductors for the piping
· (4) Grounding rods for the Piping
· Turbine Island
· (19) Air Terminals secured to the perimeter of turbine island fixed to the top of existing pole mounted light fixtures or handrail if the distance exceeds 20ft from the previous lightning rod.
· (2) stanchions with air terminals installed on the upper deck will extend 9’ above the deck and placed on the north and south ends of the upper deck
· (3) Air terminals will be mounted on top of the turbine enclosure
· (6) Down conductors evenly spaced around Turbine Island connecting to the existing grounding ring below.
· Storage Warehouse
· (7) Air Terminals mounted loan the peak of the roof
· (4) Down Conductors towards to the 4 existing grounding rods
· (4) Bonds of the Grounding system to the building’s steel
· Administration and Tipping Building
· (30) Air Terminals in the Admin Building along the edge and center of the roof at 20’ intervals
· (20) Air Terminals for Tipping Floor along the edge and center of the roof at 20’ interval
· (9) Down Conductors for the Admin Building and Tipping Building connected to the existing grounding ring
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