Problem: A major freeway project required the city of Phoenix to relocate a wastewater lift station into a hilly area with significant elevation changes. The new station discharges to an existing force main, making it susceptible to transient pressures when pumps cycle on and off. Without targeted protection, rapid pressure spikes — water hammer — could have damaged the force main, valves and pump equipment, jeopardizing reliability and increasing maintenance costs.Solution: To control transients at the source, engineers installed 8-inch APCO SRA-3000A Surge Relief Angle Valves. Each valve was set to open at 135 psig, giving the system a fast-acting “safety
