Placing the inlet and outlet nozzles of water storage ... · Placing the inlet and outlet nozzles...

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Placing the inlet and outlet nozzlesof water storage reservoirs onopposing sides of the tank shell wasfor years considered to be theoptimum arrangement to achievegood water blending. Adding aninterior elbow to direct the water in acircular flow pattern was considered agood practice to help avoid short-circuitingthrough the outlet. In recentyears the industry standard practiceincludes the installation of hydraulictank mixing systems or TMS for short.

A typical TMS consists of anarrangement of piping placed internallyin the reservoir so as to allow ahomogenous mixing of all water in thereservoir each time there is a fill and/ordraft cycle. The TMS consist of amanifold system, through which bothinflow and outflow waters pass throughtwo sets of properly sized and placedcheck valves. One set of valves isused during the fill cycle and the otheris used to drain the tank. The manifoldcan be a common inlet/outlet systemconnected to one shell nozzle designedper API 650 Standards, or to a bottom-flanged nozzle connected to a 90-degree elbow. Alternate designs may

include separate inlet and outletmanifolds, positioned either horizontallyor vertically depending on the physicalheight and diameter of the reservoir.The size of the manifold piping alongwith the placement, number, and sizeof the inlet and outlet valves can bedetermined through calculationsresulting from hydraulic studies and/orcomputational fluid dynamic (CFD)modeling.

The type of materials utilized toconstruct the TMS manifolds is largelya function of budget limitations andmay consist of PVC, HDPE, fusion-bondedepoxy, liquid epoxy, or CMLlined and epoxy coated carbon orductile steel pipe and fittings. At theupper end of the scale, 316-gradestainless steel pipe and fabricatedfittings can give a lifetime ofmaintenance free service. The type ofmaterials will also be influenced bywhether the TMS is being installed in anew tank where the parts can beplaced inside the shell before the roofgoes on; or if the project involvesretrofitting an existing reservoir withlimited access.

MIXING SYSTEMS

Learn More: For more detailed informationon Tank Mixing Systems thereader will find a wealth ofinformation at:www.redvalve.com.

The Red Valve Company manufactures Tideflex check valves in various configurations and using NSF 61 approved materials for use in potable water storage reservoirs.

For bothretrofit andnew tank

construction