Introduction: Fence Pipe – The Foundation of PV Power Plant Security

In the perimeter protection system of a PV power plant, the pipes used for chain‑link mesh fencing (posts, rails) are the core structure that carries the mesh fabric and withstands external impacts. The material, wall thickness, anti‑corrosion process, and connection method of these pipes directly determine the service life, wind resistance, and security level of the fencing system. In 2024, from the large‑scale application of hot‑dip galvanised steel pipes to the exploration of new materials such as weathering steel and zinc‑aluminium‑magnesium coated steel, PV fence pipes are moving toward higher strength, longer life, and superior corrosion resistance.

Part One: Pipe Selection – Standard Configurations of Material and Specification

1.1 Mainstream Material: Hot‑Dip Galvanised Steel Pipe

Hot‑dip galvanised steel pipe has become the mainstream choice for PV power plant fence pipes because of its excellent corrosion resistance and cost advantage. The galvanised coating thickness is typically 80‑100 μm, ensuring a service life of more than 25 years.

1.2 High‑Corrosion‑Resistance Option: Zinc‑Aluminium‑Magnesium Coated Steel Pipe

For PV power plants in coastal tidal flats and high‑salt‑spray areas, zinc‑aluminium‑magnesium (Zn‑Al‑Mg) coated steel pipe – with its self‑healing ability and superior corrosion resistance – is gradually becoming an upgraded alternative to hot‑dip galvanising. The salt‑spray test duration for Zn‑Al‑Mg coating can exceed 1500 hours, a 50% improvement over traditional hot‑dip galvanising.

1.3 High‑Strength Option: Q355B Material

For fencing systems subject to high wind loads or long spans, using high‑strength steel such as Q355B can effectively reduce the wall thickness of the pipe, lower the overall weight, while maintaining structural strength.

Part Two: Product Innovation – Advances in Fence Pipe Technology in 2024

2.1 Large‑Span Column‑Less Fencing System: Structural Innovation in Pipes

In 2024, to meet the demand for large‑area perimeter fencing in PV power plants, some companies introduced large‑span column‑less fencing systems. This system uses high‑strength square tubes as main posts, with spacing extended to 10‑15 m, significantly reducing the number of posts and lowering foundation construction costs.

Technical parameters:

Main post: 100×100×3.0 mm Q355B square tube

Rail: 50×50×2.0 mm square tube

Maximum span: 12 m

Wind resistance: 40 m/s

2.2 Pre‑Assembled Fence Units: Modular Design Improves Installation Efficiency

In 2024, pre‑assembled fence units were more widely used in PV projects. Posts, rails, and diagonal braces are pre‑welded into standard units (typically 2.5 m or 3 m wide) at the factory. On‑site work is reduced to connecting the units and fixing the foundations, improving installation efficiency by more than 30%.

2.3 Anti‑Corrosion Technology Upgrade: Dual‑Layer Protection System

For highly corrosive environments, a “hot‑dip galvanising + powder coating” dual‑layer protection system for pipes emerged in 2024. The underlying galvanising provides cathodic protection, while the outer powder coating enhances corrosion and UV resistance. This is particularly suitable for harsh environments such as coastal areas and around chemical plants.

Part Three: Standards and Specifications – Quality Control for Fence Pipes

3.1 Technical Specifications for PV Power Plant Fencing

In 2024, several provinces in China issued local or enterprise standards for PV power plant fencing construction, specifying clear requirements for pipe specifications:

3.2 Pipe Testing Standards

Fence pipes must meet the following testing requirements:

Dimensional accuracy: conforming to GB/T 6728

Galvanised coating thickness: measured by magnetic thickness gauge; local ≥65 μm, average ≥85 μm

Adhesion: cross‑cut test with no peeling

Salt‑spray test: ≥1000 hours without red rust

Part Four: Engineering Application Cases

4.1 Schloen 60 MW Plant, Germany: 5 km of Fence Pipe Application

In June 2024, the 60 MWp Schloen PV power plant project in Germany broke ground, with a fence length of more than 5 km. The project used 2.0 m high hot‑dip galvanised chain‑link fencing, with posts of 76 mm round pipe, 2.5 mm wall thickness, and foundations 1.0‑1.5 m deep, ensuring stability under strong wind conditions.

4.2 Yorkville 44 MW Solar Farm, USA: 8‑Foot High Fence

In December 2024, the 44 MW Yorkville solar farm in Illinois, USA, was approved. The fence is 8 ft (about 2.4 m) high, using high‑strength galvanised steel pipe posts, with a 20‑ft wide vehicle access gate, effectively preventing large animal intrusion and vandalism.

4.3 Fishery‑Solar Hybrid Project, China: Corrosion‑Enhanced Fencing

In 2024, several fishery‑solar hybrid projects in China used Zn‑Al‑Mg coated steel pipe fencing to cope with high humidity and high salt‑spray environments. Pipe wall thickness was increased by 0.5 mm compared to standard, and the coating thickness exceeded 100 μm, ensuring a 25‑year service life.

Part Five: 2024 Fence Pipe Technology Trend Summary

Outlook

Looking ahead to 2025 and beyond, fence pipes for PV power plants will continue to evolve in the following directions:

Lightweight and high‑strength: The use of high‑strength steel and thin‑walled profiles will further reduce material consumption and transport costs

Long‑lasting corrosion protection: The proliferation of Zn‑Al‑Mg coatings and dual‑layer protection will push fence life toward 30‑35 years

Prefabricated installation: Pre‑assembled fence units and quick connectors will greatly improve construction efficiency

Unified standards: National and industry‑level technical standards for fencing will be gradually refined

In a Nutshell

In 2024 – from the 5 km fence at Schloen, Germany, to the 8‑foot high protection at Yorkville, USA; from hot‑dip galvanised steel pipe to the upgraded alternative of Zn‑Al‑Mg coating – chain‑link fence pipe for PV power plants is building a “steel backbone” for plant security with stronger corrosion resistance, higher strength, and longer life.