Improving Galvanized Purlin Performance

Introduction
Industrial Galvanizers Corporation introduced its PermagalTM Purlin service in 1997 provided a heavy-duty solution for galvanized steel purlin applications that operate in more aggressive environments such as indoor swimming pools, chemical plants of other industrial facilities that generate high levels of humidity inside their structures.  PermagalTM Purlins were developed to meet the need for a galvanized purlin with significantly improved durability over the pre-galvanized cold formed purlins.  PermagalTM Purlins are hot dip galvanized after slitting, punching and cutting that produces a galvanized purlin free from exposed, untreated edges.  In addition, PermagalTM Purlins have a zinc coating mass significantly heavier than that applied to a Z350 pre-galvanized purlins.

Facts About Permagaltm Purlins

• PermagalTM Purlins have a zinc coating mass typically three times greater than Z350 pre-galvanized purlins.
• The maintenance-free life of a PermagalTM Purlin is guaranteed to exceed that of pre-galvanized purlins in proportion to the zinc coating mass.  This is typically three times the life.
• PermagalTM Purlins are hot dip galvanized to comply with the Australian Standard for Hot Dip Galvanized Coatings on Ferrous Products AS 4680, and the International Standard ISO 1461.
• All edges and holes are completely protected on PermagalTM Purlins as they are hot dip galvanized after manufacture.  This significantly reduces the corrosion stress on the coating.  Heavy (3mm) pre-galvanized purlins will show evidence of cut edge corrosion almost immediately after installation in aggressive environments.
• The availability of PermagalTM Purlins allows the specification of a completely hot dip galvanized package of structural steel, purlins, girts and fasteners.
• The hot dip galvanizing process does not affect the structural strength of the sections.  Industry standard load tables are available for use with PermagalTM Purlins.       
  

Typical Applications For Permagaltm Purlins
PermagalTM Purlins have already been used in a wide range of heavy duty applications.  Details of these case histories are available from Industrial Galvanizers if required.  These applications include:

• Coastal or marine structures where standard purlins would require a multi-coat paint system for acceptable durability
• Aquatic centres, indoor heated pools subject to high levels of humidity.
• Mining and mineral processing plants - coal treatment plants, concentrate storage buildings, refineries subject to chemical fumes, high humidity and frequent wash-down.
• Conveyor stringers to bring the durability of the supporting structure in line with the hot dip galvanized conveyor systems.
• Water reservoir roofing structures. The under-roof areas of water storages are subject to high levels of humidity.

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