500KV OHL STEEL TOWER
500KV OHL steel tower refer to a lattice steel structure used in overhead electric power transmission and distribution to transmit 500KV circuit electrical energy along large distances. It consists of one or more conductor (most often three or four) suspended by towers or utility poles. Since most of the insulations is provided by air, overhead power lines are generally the lowest-cost method of power transmission for large quantities of electric energy.
500KV power transmission line belongs to high voltage grade, used for sub-transmission and transmission of bulk quantities of electric power and connection to very large consumers. 500KV overhead transmission line steel tower including many types, such as lattice angular tower, tubular tower, monopole, or guyed towers and mast.
After fabrication all steel tower are delivered to the galvanizing facility to be Hot DIP Galvanized. Towers are processed through the facility by Caustic Cleaning, Pickling, and then Fluxing. These strict procedures insure years of maintenance free towers. Even we take secondary finish for client again, which as duplex surface treatment. The duplex coating applied in our own paint shop.
Duplex surface treatment involves sand-blasting to remove 5-10 microns of the 70-150 micron thick hot dip galvanization coating. This removes any contaminants and roughens the surface. Almost immediately afterwards, in a controlled atmospheric environment, water-based painting, specially developed and manufactured for this purpose, is applied to the tower (structures) to a thickness of 80-120 microns.
Availability size: Based on the customer's requirements.
Material: Chinese material or as per clients requirement
Package: Tower structure in bundle, small accessories in wooden box; or other solution accepted by both parties before delivery
Port of Loading: Ningbo or Shanghai Port
Lead Time: One month or based on the customer's needs
Besides conform to the drawing and design, the materials and fabrication of tower components shall conform to the following standards (Chinese Standard or other standard):
1. GB/T2694-2010 Transmission line tower - - Technical requirements for manufacturing
2. JGJ81-2002: Technical specification for welding for steel structure of building
3. GB9787-88: Measuring and allowable tolerance for hot-rolled equal angle
4. GB709-88: Measuring and allowable tolerance for hot-rolled plate and strip
5. GB/T699-1999: Quality Carbon Structural Steel
6. GB/T1591-1994: Low alloy high strength structural Steel
7. GB700-88: Carbon Structural Steel
8. GB222-84: Method of sampling steel for determination of chemical composition and permissible variations
9. GB/T228-2002: Method for Tensile testing of metals
10. GB/T232-1999: Method for Bending test of metals
11. GB/T5117-1995: Carbon Welding Rod
12. GB/T5118-1995: Low Alloy Welding Rod
13. GB/T8110-1995: Welding wires for gas shielding arc welding of carbon and low alloy steels
14. GB/T10045-2001: Carbon steel flux cored electrodes for arc welding
15. JB/T7949-1999: Weld outer dimensions for steel construction
16. GB50205-2001: Test Standard for Acceptance of Steel Structure
17. GB/T470-1997: Zinc Ingot
18. GB3098.1-2000: Mechanical properties of fasteners-Part 1: Bolts, screws and studs
19. GB3098.2-2000: Mechanical properties of fasteners-Part2: Nuts, and thread
20. GB3098.3-2000: Mechanical properties of fasteners-Part3: Fastening screw
21. GB/T5780-2000: Helical Bolts Grade C
22. GB/T41-2000: Helical Nuts Grade C
23. GB/T90-2002: Flat Washer Grade C
24. GB/T13912-2002: Metal Coating, Technical Requirement
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