Hydraulic balancing

External seals (Fig. 10-115) are installed with all seal components protected from the process fluid. The advantages of this arrangement are that (1) fewer critical materials of construction are required, (2) installation and setting are somewhat simpler because of the exposed position of the parts, and (3) stuffing-box size is not a hmiting factor. Hydraulic balancing is accomphshed by proper proportioning of the seal face and secondary seal diameters. 

Enclosed Type Impeller Hydraulically Balanced for Reduced Thrust Load... 

IMPELLiR/ hydraulically balanced double suction enclosed type for better performance under critical suction conditions. 

Conception of a GIS-Based Data Model for Combined Hydrochemical and Hydraulic Balance Calculations in Pleistocene Landscapes -an Approach of Regionalization... 

The simplest way to operate a hydrocyclone is to open both the underflow and overflow to the atmosphere because this ensures correct hydraulic balance between the two outlets, independent of what happens downstream of either of the outlets. VirmaUy aU test data available on different cyclone designs, as well as theoretical or empirical formulae for performance characteristics, are for such conditions of equal back pressure on both discharge streams. 

In some classification applications, the required cut point is very sharp and the rheology of both separated phases is such that they remain quite fluid. In this type of application the pond used would be relatively deep, and separation would be akin to a liquid/liquid separation, using a hydraulic balance under some form of baffle. 

The radius has then lo be set, to create a hydraulic balance between the two liquid phases, to maintain the equilibrium line at rg, where required. 

Once the weight of liquid on one portion— the lowest area—of a tray deck exceeds the dry tray pressure drop, the hydraulic balance of the entire tray is ruined. Vapor flow through the low area of the tray deck ceases. The aeration of the liquid retained by the weir on the low area of the tray deck stops, and hence the hydraulic tray pressure drop increases even more. As shown in Fig. 4.3, the liquid now drains largely... 

The unit in our initial tests incorporated no modifications except opening some clearances between mating parts at room temperature to avoid bind from differential contraction at low temperatures. As our test experience increased, some changes in hydraulic balance were made. 

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