AFC Semper RPM: Topsfield Water Department's Answer For Identifying Water Hammer And Other System Pressure Issues The Topsfield Water Department purchased three of the AFC SEMPER RPMs and deployed them in November 2020. The units have helped the water department identify water hammer and other system pressure issues before they become a problem. For any water system, water hammer, also known as pressure transients, pose significant threats, from leaking joints to service connection failures and even pipes that burst. The damages resulting from these events can be costly to repair and leave customers without water. The Topsfield Water Department in Topsfield, Massachusetts, has found an answer for identifying water hammer and other system pressure issues before they become a problem. The solution is the AMERICAN Flow Control SEMPER™ Remote Pressure Monitor (RPM). Introduced in February 2020 in partnership with Trimble Water, the AFC SEMPER RPM provides utilities with the data needed to monitor water pressure throughout their systems and help identify leaks and reduce non-revenue water.