Designers of tanks and process vessels are faced with the problem of

choosing the most reliable material of construction at a reasonable cost.

When handling corrosive materials, a choice must often be made between

using an expensive metallic material of construction or using a low-cost

material from which to fabricate the shell and then installing a corrosion-

resistant lining. Carbon steel has been and still is the material predominantly

selected; although, there has been a tendency over the past few years to use

a fiberglass-reinforced plastic shell. This latter choice has the advantage of

providing atmospheric corrosion protection of the shell exterior.