TiCl4
Chemical
- May 1, 2019
- 631
In discussion with my colleagues regarding the possibility of installing a dilution air blower on a vent stack, the following question arose:
Let's say a dilution blower is provided that has a deadhead pressure of, say, 3 psig, and the vent stack is in the middle of relieving an emergency event. The relief event is such that the stack pressure is 10 psig at the inlet due to the relieving gas flow (close to where the dilution air blower would discharge into the stack).
My colleagues seemed to think that by providing a "Y" connection would somehow prevent backflow through the blower. I contended that unless the stack were provided with some kind of venturi or other design to accelerate the gas and drop local pressure below 3 psig, the blower would experience back-flow through it.
My overall contention and understanding of a blower is that if discharge pressure is higher than the deadhead pressure, it will experience backflow.
Let's say a dilution blower is provided that has a deadhead pressure of, say, 3 psig, and the vent stack is in the middle of relieving an emergency event. The relief event is such that the stack pressure is 10 psig at the inlet due to the relieving gas flow (close to where the dilution air blower would discharge into the stack).
My colleagues seemed to think that by providing a "Y" connection would somehow prevent backflow through the blower. I contended that unless the stack were provided with some kind of venturi or other design to accelerate the gas and drop local pressure below 3 psig, the blower would experience back-flow through it.
My overall contention and understanding of a blower is that if discharge pressure is higher than the deadhead pressure, it will experience backflow.