Pre-GI can be used as long as it is 550 GSM steel. The galvanization coating thickness is a maximum of 20 micron each side for 550 GSM steel.
HDG can also be used provided min zinc thickness is 80 microns.
The mounting structure steel shall be as per latest IS 2062 : 2011 and galvanization of the mounting structure shall be in compliance of latest IS 4759, material thickness shall be minimum 2.5 mm.
I have also provided clauses from Gujarat, TamilNadu and Maharashtra Energy Development Agencies where they are specifying the galvanization thickness required in microns:
Gujarat – “Hot dip galvanized MS mounting structures shall be of 80 microns but it shall not be less than 60 microns at any point used for mounting the modules/ panels/arrays.” Maharashtra – “Hot dip galvanized MS mounting structures may be used for mounting the modules / panels / arrays. Minimum thickness of galvanization should be at least 120 microns” Tamilnadu – “Hot dip galvanised steel with a minimum galvanisation thickness of 120 microns or aluminium alloy”
These could be followed as standards for projects where you are proposing GI structures.
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By Venkat|2020-07-07T09:50:54+05:30June 29th, 2020|Comments Off on Corrosion in Pre-GI and Hot Dip Galvanized (HDG) Structures