Halcyon Assembly™ is a special component installed in the suction line of surge tanks to control the turbulence in a flowing fluid. These units or plates are simple in design and very effectively control the velocity of the fluid thus preventing cavitation in the fluid. They are an a necessary tank and system component for all National Fire Protection Association (NFPA 22) fire water tank and fire suppression systems. In fluid mechanics, a vortex is a turbulent flow that must be controlled to prevent machine failure and damage to other rotating parts and structures. A vortex is a region formed in a fluid when the fluid’s flow rotates around an axis line (either straight or curved) and the fluid flows in a swirling motion at a high velocity. It is something similar to tornadoes or whirlpools created by fast moving winds or an airplane’s wing. Halcyon Assembly™ units or plates help to decrease the speed of a fast moving fluid and smooth it into a laminar flow instead of a turbulent flow, thus reducing wear and tear. These plates also help prevent cavitation (small liquid-free zones such as bubbles or voids) in the fluid. Cavitation can create dents, shock waves and imbalance in the moving parts. Once cavitation affects a surface it tends to erode at an accelerating rate. This makes the surface prone to stress corrosion. Many applications with process water, potable water, and industrial effluent applications use Halcyon Assembly™ products throughout the world today.