The purpose of this document is to provide procedures for conducting periodic preventive maintenance (PM) inspections along with the more comprehensive inspections that are required and that must be performed by a Trained Inspector as relating to inspection of fiberglass reinforced plastic (FRP) atmospheric tanks and vessels in corrosive industrial and commercial service after a set period of time and when there is a change of service. The procedures are intended to:

• minimize maintenance costs,
• ensure compliance with environmental and safety requirements,
• minimize system failures and
• ensure that proper engineering, construction and maintenance practices are in place.