By Richard Murphy, ZCL Composites Inc.
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| Installation of fibreglass tanks is simple and economical. |
Introduced in 1963, fibreglass tanks presented a rust-immune alternative to steel. Since then, fibreglass tank usage has grown remarkably. Over 15 years ago, some major oil companies in Canada embarked on a storage tank replacement program and fibreglass tanks were their preferred choice.
When properly installed, they are engineered to withstand truck H-20 axle loading of 32,000 pounds per axle. The standard tanks' integral rib/tank interface for added tank strength allows burial to a depth of seven feet in wet or dry soil conditions. Additional burial depths can be accommodated through applied design criteria.
Fibreglass tanks are often exhumed, tested, re-certified by the manufacturer and re-installed in new locations, even after many years of reliable underground fuel storage - some as much as 20 years.
Installation is simple and economical. They require clean and free-flowing pea gravel or crushed stone. This backfill material is self-consolidating, doesn't settle and requires 30% less material than if compacted sand is used.
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