What is the primary purpose of a coupon test installation in a distribution system?

The primary purpose of a coupon test installation in a distribution system is to determine the rate of scaling and corrosion. This method involves placing metal coupons, which simulate the materials used in the distribution system, into the water to be tested. Over time, these coupons will experience the same environmental conditions as the pipes, allowing for the measurement of how quickly corrosion or scaling occurs under actual service conditions.

This testing is crucial for assessing the longevity and integrity of the distribution system, as corrosion can lead to leaks, reduced flow rates, and the potential for water quality issues. Additionally, understanding these rates helps inform maintenance schedules and material choices for future installations and repairs, ultimately contributing to overall system reliability and safety. Through coupon testing, operators can identify potential problems before they develop into serious issues, thus maintaining compliance with regulatory standards and protecting public health.