What is the proper method for isolating metallic anchor straps from a steel tank?

The proper method for isolating metallic anchor straps from a steel tank is to place non-conductive material between the strap and the tank. This approach helps prevent galvanic corrosion, which can occur when two different metals are in contact with each other in the presence of an electrolyte, such as water. By using a non-conductive material, you effectively create an insulating barrier that stops electrical conductivity between the metal strap and the steel tank, thus protecting the integrity of both components and extending their service life.

In the context of the other choices, while using rubber padding or a plastic coating may seem like they could achieve a similar effect, they might not be specifically designed for preventing galvanic action or may still allow some conductivity. Applying paint can also be problematic—while it may provide some level of insulation, it typically does not create a reliable barrier over time, especially in a high-moisture environment. Therefore, employing non-conductive materials is the most effective and appropriate method for ensuring isolation and protection against corrosion.