Polyethylene does not have the long history of use in storage tank construction that steel or concrete materials do, but it does provide greater corrosion-resistant properties. Nonetheless, there are other limitations when compared to fiberglass.
• Underground fiberglass tanks don’t have the many limitations usually placed on poly tanks with regard to common installation conditions such as groundwater table, burial depths and traffic loads.
• Given structural design considerations, poly tanks are generally limited in capacity. For example, underground tank models usually are limited to much smaller capacities than what is required for typical fire protection tank installations, making it necessary to manifold together many small tanks to get the needed storage capacity. This adds cost and is less desirable than fewer large tanks.

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