Barometric Leg In Vacuum System

Rethinking Barometric Legs by D K Singhal 2.

Barometric leg in vacuum system. If a barometric leg is utilized the vertical length should be 136 inches for each inch of mercury Hg vacuum the barometric leg should also have a. Such a system is called a barometric condenser. Inadequate Seal Leg Capacity.

Detecting Condensate BackUp in Seal Legs. Seal Leg Flange Leak Outside Seal Drum. The minimum required height of the barometric leg is therefore a function of the maximum barometric.

In a vacuum system that is used to condense steam and condensable vapors through heat exchangers or condensers the condensate is normally dropped into a receiver tank that is often vented to atmosphere or a low-pressure vent system. Barometric leg is a vertical pipe connecting two vessels one at low pressure or vacuum condition P1 and the other at higher pressure or atmospheric pressure P2. A rotary vacuum filter having a barometric or drop leg for generating vacuum in the filtration cycle of the filter wherein the end of the leg immersed in the seal pit is formed to a frustro-conical configuration for both reducing turbulence in the seal pit as the air-liquid mixture exits therefrom and for recovering a portion of the energy in the velocity head of the air-liquid mixture flow.

Dont forget that the effective length of your barometric leg is from the condenser to the height where the downstream leg of the loop seal enters the vessel - this can reduce your barometric leg length significantly and it must be checked against the vacuum you want to maintain. This distance changes of course with elevation. Barometric Legs Barometric legs are long neglected specially for paper machine wet end vacuum systems.

The barometric leg allows the effluent coolant and condensed vapors to exit no matter what the vacuum is in the process vessel. This normally implies that one remove air from a system to some acceptable sub atmospheric pressure by the use of some type of vacuum pumping equipment. A rotary vacuum filter having a barometric or drop leg for generating vacuum in the filtration cycle of the filter wherein the end of the leg immersed in the seal pit is formed to a frustro-conical configuration for both reducing turbulence in the seal pit as the air-liquid mixture exits therefrom and for recovering a portion of the energy in the velocity head of the air-liquid mixture flow.

If there is insufficient hotwell area present the seal will be broken and air drawn into the tailpipe affecting the performance of vac-uum-producing equipment and the process. Condensate BackUp Due to Air Leak in Barometric Drain Line. Seal Drum Fills.