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Dump Tubes are an important part of a system discharging in a condenser. These devices are primarily deployed so as to minimize the size of the bypass valve outlet where the specific volume of steam dramatically increases at low or sub-atmospheric pressures.
These dump tubes are normally fitted into the condenser inlet duct and are carefully designed to achieve the final pressure reduction stage and allow the steam to expand and cool prior to entering the turbine exhaust or condenser.
It is recommended to ensure that the Ddump Tube is designed properly with respect to size, shape and profile so as to a void interference with the turbine exhaust steam path under normal turbine operation. The arrangement and the size of the holes in the dump tube are selected so as to minimize noise generation and direct the steam path away from the duct walls and towards the condenser inlet depending upon the installation.
Depending upon the installation, the arrangement of the holes are selected. In case the Dump Tube is installed in the condenser then the arrangement of the holes are drilled in two 90 degree sectors.
This does not allow the steam to go up the turbine exhaust or directly down on to the tubes in the condenser.
In case the dump tube is installed in the turbine exhaust then the holes are drilled around the complete circumference i.e.360 degrees.