CASE HISTORY: Chemical Plant - Primary Containment Microbial Chemical Wast Water Treatment Facility Re-lining of existing hypalon (HDPE) liner - LaPorte, Texas.	Installation Bulletin

 BACKGROUND

• The existing Hypalon liner at this large chemical plant showed major signs of wear. Long split seams and gaps were allowing seepage into the underlying sub-base. The only options available were, either remove and dispose of the existing liner, a major expense, or completely resurface the Hypalon liner using some type of coating system. Because of the limited down time available, ES-4500 DLX polyurea spray was chosen.

 INSTALLATION

• Approximately 17,000 square feet of contact surface area was water blasted to remove contaminants.
• The large open gaps and seams were covered with geo-textile membrane.
• The entire surface area of the Hypalon liner was primed with ES-3000 (IsoPrime) at a wet film thickness of approximately 5 mils and allowed to cure before installation of the coating system.
• The Hypalon liner was spray coated with ES-4500 DLX at an average film thickness of 60 mils, using a plural component, high-pressure heated pump system. Spray pressure was 3000 psi and material was heated to 165°F.
• Re-opened to operation 3 hours after application.