M51 Air Valves: Air Release, Air/Vacuum, and Combination, Second Edition Awwa

The safe and efficient operation of a liquid piping system is dependent on the continual removal of air and wastewater gases from the liquid piping system. This revised second edition includes information pertaining to wastewater applications including scouring velocities for larger piping systems, and information on an inflow preventer device installed to protect from malicious tampering, freeze and flood, and to prevent the entry of contaminated water into the potable water distribution system.Operators, technicians, and engineers will use this manual to understand the design, use, application and Choosing the proper air valve for the application is critical to all liquid piping systems.This manual provides essential information for selecting, sizing, locating, and installing air valves in water, wastewater and reclaimed water pipeline systems.