The world of hot dip galvanizing around us - hdgasa
The world of hot dip galvanizing around us - hdgasa
The world of hot dip galvanizing around us - hdgasa
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<strong>The</strong> <strong>world</strong> <strong>of</strong> <strong>hot</strong> <strong>dip</strong> <strong>galvanizing</strong> <strong>around</strong> <strong>us</strong><br />
Use <strong>of</strong> duplex systems in Chile<br />
Cement grinding Mill, Melon S.A. Ventanas, Chile<br />
General<br />
Melon Cement Project located in the<br />
commune <strong>of</strong> Puchuncavi, sector Ventanas<br />
coastline in central Chile.<br />
Environmental characteristics<br />
<strong>The</strong> exposure conditions are unique in<br />
combining the effects <strong>of</strong> marine and<br />
ind<strong>us</strong>trial environment, given the<br />
influence <strong>of</strong> the activity in the area, which<br />
highlights the presence <strong>of</strong> a smelting and<br />
refining <strong>of</strong> copper concentrates and<br />
thermoelectric power generation plants.<br />
This combination <strong>of</strong> high concentration <strong>of</strong><br />
sulphur dioxide in a marine environment<br />
in the upper range <strong>of</strong> C5 environments<br />
according to ISO 12944-2.<br />
<strong>The</strong> requirements imposed by the client<br />
for the corrosion protection coating<br />
require time for its first maintenance work<br />
over 15 years.<br />
Project<br />
<strong>The</strong> project consists <strong>of</strong> the corrosion<br />
protection <strong>of</strong> 800 tons <strong>of</strong> structural steel,<br />
grills and railings, equivalent to 30 000m 2 .<br />
<strong>The</strong> specified duplex protection system<br />
was:<br />
◆ Hot <strong>dip</strong> <strong>galvanizing</strong> conforms to ASTM<br />
A123<br />
◆ Abrasive br<strong>us</strong>h <strong>of</strong>f cleaning, SSPC SP7<br />
◆ Epoxy primer, 50µm DTF<br />
◆ Aliphatic polyuretane, 60µm DTF<br />
After assembly <strong>of</strong> the structure is carried<br />
out an inspection to determine possible<br />
alterations and damage to the coating to<br />
ensure durability <strong>of</strong> the protection system.<br />
Life cycle costing analysis<br />
<strong>The</strong> analysis <strong>of</strong> life cycle cost is carried out<br />
with the methodology published by NACE<br />
international in the paper number 08279<br />
to compare different alternatives for<br />
corrosion protection considering the<br />
maintenance <strong>of</strong> the protection system<br />
through the years <strong>of</strong> service. <strong>The</strong> results<br />
are delivered in a current cost curve vers<strong>us</strong><br />
time graph, figure 5.<br />
8 Hot Dip Galvanizing Today Volume 8 Issue 4 2011<br />
Location <strong>of</strong> both the thermal power station and cement grinding mill with respect to the<br />
coastline.
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