![]() ![]() A rotary syphon, with its lower syphon clearance, produces a more even cross-cylinder temperature transfer profile when the condensate is in the rimming stage. This close clearance has an important effect on heat transfer consistency across the face of a cylinder. A stationary syphon inlet, on the other hand, must be placed high enough to allow sufficient clearance, under all conditions, between the syphon inlet and the cylinder shell passing beneath it. ![]() Since the rotary syphon inlet (i.e., syphon shoe) remains fixed in relation to the cylinder shell, a rotary syphon inlet can be placed closer to the cylinder shell. Rotary syphon systems may use either a single syphon or multiple syphons for evacuation, depending on application conditions and requirements. Instead of being fixed in one position, rotary syphons remain fixed in relation to a point on a rotating cylinder shell. Even the basic configuration of the syphon itself, the interior diameter of syphon piping, and external outlet pipe sizing can have a profound effect on pressure differential requirements. The amount of centrifugal force present at operating speeds, the viscosity of the fluid being transported, and the presence of air or gas entrained in the flow (a condition known as blow-through) are all to be considered. Several factors determine how much differential pressure is needed to operate a syphon. ![]() Without sufficient differential pressure or fluid velocity head, efficient fluid evacuation is not possible, resulting in flooding. This differential is present whenever there is greater pressure at the inlet of the syphon than at the outlet, since a fluid always flows from the area of the highest pressure toward the area of lowest pressure. In most cases, the motive force that causes a flow through the syphon is differential pressure. The rotary joint connects the rotating cylinder to stationary piping outside the cylinder. For an effective and efficient syphon system, all factors must be considered during the specification process.Ī syphon is an arrangement of piping inside a rotating cylinder that allows a fluid to flow from inside the cylinder out to a rotary joint. But there are many complex and interrelated factors that determine how a syphon performs this function and how it interacts with other components within the entire system. A syphon system's function is simple: it removes a fluid from within a rotating drum or cylinder. ![]()
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