Fabricated Dual-Laminate Equipment such as towers, scrubbers, process vessels and tanks have been used for over 30 years in highly corrosive applications. These are commonly found in the chemical process industry, pulp and paper, and metal refining where chemicals such as chlorine & chlor-alkali products, strong acids, strong bases, organic compounds and others are present. The availability of chemically resistant thermoplastics, ex. polyvinyl chloride, polyolefins and fluoropolymers allows the Design Engineer to tailor materials of construction to a particular chemical service. Other design parameters that must be considered are temperature, pressure (internal & external), specific gravity of liquid, mechanical loads (wind, seismic, and attachments such as platforms), liquid and vapour permeation etc. This paper describes Dual-Laminate Construction in terms of material selection, design and fabrication techniques. Some of the applications where Dual-Laminates are used are also outlined.
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