scope:

This guideline sets out the key features required for planning and executing inspection, maintenance and repair works on aboveground fully supported vertical steel storage tanks.

The descriptions of key tank components that require inspection and/or maintenance, of degradation mechanisms, and of common inspection techniques, are followed by sections describing the Probabilistic (risk-based and reliability-based) Preventive Maintenance (PPM) concept, and for each tank component a detailed description of inspection and repair methods and degradation limits.

Guidance is given on sources of additional information that will assist both continued operation and inspection.

This document mainly addresses atmospheric storage tanks for oil and chemical products (referred to elsewhere in the text as conventional storage tanks). Tanks for refrigerated storage of liquefied gases are covered in EEMUA 147⁽¹⁾

¹ The joint efficiency factor is the ratio of the strength of the joint divided by the strength of the parent plate.