Neot Smadar - Analysis of Coating For Solar PV Steel Structure [PDF]

Zitiervorschau

Dr. Zapfe GmbH Engineering office for structural engineering + solar technology

Project: Neot Smadar

Analysis of coating for Solar PV Steel Structure Project: Neot Smadar Location: IL-88855 Lotan Israel

1. Zinc Magnesium ZM 310 in C3 – expected protection duration in years

If Purlins and girders are with coating ZM 310, the ZM 310 will be lost in atmosphere C3 (assumed C3, no Info in Geo-report) after 21 years to >50 years as above in test’s table in red frame. Average is more than in 35.5 years.

Dr. Zapfe GmbH Engineering office for structural engineering + solar technology

Project: Neot Smadar

2. Zinc Coating - expected protection duration in years

The support above of soil Table from ISO 12944-2 – Mass loss for surface unit and thickness reduction in difference corrosion category

Material loss in C3: Zinc:

>0.7 - 2.1 μm/y

2.10 x 30 = 63.0 μm < 80 μm ok!

If zinc coating is 80 μm for support SRF6 above of soil, zinc coating 63.0 μm will be lost in 30 years.

The support in soil The test results in Geo-report from page 6*

* GEOTECHNICAL REPORT NEOT SMADAR PV SOLAR PROJECT – Midronot Engineering 02/12/2021

Dr. Zapfe GmbH Engineering office for structural engineering + solar technology

Project: Neot Smadar

PH: > 7.5 average Cl: average SO4 2-:

192 mg/kg = 5.41 mmol/kg 285.6 mg/kg = 2.98 mmol/kg

average Resistivity:

776 Ωm

Summary: aggressive

accordance with DIN 50929-3 Table 2 B0 ≈ +1 → ground class Ia – no to few

Material loss: Zinc coating: beginning 2 years, 11 μm/y

2 x 11 = 22 μm

Zinc coating: >2 years to 25 years, 2 μm/y

23 x 2 = 46 μm

Σ loss after 25 years = 68 μm

If zinc coating is 80 μm(Schletter Standard) for support SRF6 in soil (or the anchoring depth of pile SRF6 in soil), zinc coating 80 μm will be lost more than in 25 years.