Engineering and Design :30years Designing Life

Designing Life of Permastore Glass-Fussed-Steel Tanks

Permastore Ltd Glass-Fused-to-Steel structures have been utilized extensively for the storage and treatment of drinking water, agricultural feed crops and animal waste, industrial effluents and municipal sewage. Our structures have proven to be reliable and to provide a cost effective containment solution for world-wide environmental problems.

During August 2000 we undertook a detailed Design Life review of Permastore's Glass-Fused-to-Steel tanks and silos and determined that our products are suitable for minimum design life in excess of 30 years. Our evaluation included the experience we have accrued over a period extending over 35 years in association with the evolution of design, third party assessment, and an ongoing commitment to a provides a sound basis for minimum 30 year Design Life compliant with ISO 15686 parts 1, 2 & 3.

It is also important to differentiate between the terms "Design Life" and "Service Life"

> Design Life is the service life intended by the designer.
> Service Life is the period of time after installation during which a building or its parts meets or exceeds the performance requirements.

The earliest Glass-Fused-to-Steel tanks supplied for industrial/Municipal applications have proven service history of at least 35 years and therefore it is reasonable to conclude that Permansotre Glass-Fused-to-Steel tanks will provide a Service Life well in excess 40 years.

We have absolute confidence that permastore's products are equal to or significantly better than any other containment solutions currently available. Glass-Fussed-to Steel tanks provide a well proven, cost effective, readily adaptable and easily maintainable concept with an established performance pedigree.

P Harrop
Technical Director
Permastore Ltd.

1 May 2007