What is the purpose of a dielectric union in piping systems?

The purpose of a dielectric union in piping systems is primarily to prevent corrosion and deterioration of the metals used in plumbing. When different types of metals, such as copper and steel, come into contact with each other in the presence of electrolytes (like water), galvanic corrosion can occur. This type of corrosion can lead to significant damage over time, as one metal deteriorates to protect the other.

A dielectric union introduces a non-conductive material between the different metal types. This prevents electric current from passing between the metals, thereby inhibiting the galvanic reaction that leads to corrosion. By using dielectric unions, you help ensure the longevity of the piping system and reduce maintenance costs associated with leaky or corroded pipes.

The other options do not accurately reflect the primary function of a dielectric union. Increasing flow rate is related to the design of the piping system itself and not specific to dielectric unions. The facilitation of easy fittings is more about the mechanical properties of the union rather than its dielectric characteristics. Maintaining temperature does not pertain to the roles that dielectric unions play within a piping system.