Which step is NOT part of controlling corrosion in piping?

Controlling corrosion in piping systems involves several crucial steps aimed at protecting the materials from deterioration. The development of protective coatings inside pipes, the use of corrosion-resistant materials or coatings, and the control of electrochemical action are all direct strategies used to minimize or prevent corrosion. These methods function by either providing a barrier to corrosive agents or by altering the environmental conditions that lead to corrosion.

Increasing water velocity, however, does not typically contribute positively to corrosion control. In fact, higher water velocity can exacerbate erosion and lead to localized corrosion. While it may help in certain contexts, such as preventing sediment build-up or stagnation, it does not directly control corrosion and can in some cases lead to increased wear on the piping material. Hence, this option stands out as not being a reliable step in the control of corrosion within piping systems.