Smoke Exhaust Rate at corridor for High Rise Building - Residence

[Vusal Quliyev]

Dear Friend,

I received one high rise Residence project to check. There is stairway pressurization system and corridor exhaust system applied by designer. There is lift lobby located between corridor and stairway. No any pressurization considered at lobby.
Building consist of 33 level and height is 133 m.
Designer considered total 10900 l/s stairway pressurization (325 l/s for each).
There is only 200 l/s exhaust rate considered for smoke exhaust which is located at corridor (Shaft size is only 200x300 mm for smoke exhaust).

Please find attached schematic drawing and floor plan for you consideration.

https://mega.nz/#F!KOQCWIDb!L0bMILSKa-zQuI96nCIy8A

I am confused. What do you think about this situation?

Additional information
Building totally protected by sprinkler.
There is no any rational analysis concluding how these values were derived. Minimum and Maximum differential pressure at doors are: 15 Pa and 65 Pa.

 

[stookeyfpe]

Did the submittal include the rational analysis concluding how these values were derived? Are the door opening pressures within the limits prescribed in the jurisdiction building code? Is the building protected by an automatic sprinkler system?

 

[Vusal Quliyev]

Dear Stookeyfpe,
I edited my post based on the question came from you.

 

[stookeyfpe]

I don't know enough about what your local codes prescribe to offer you any reasonable guidance. I can offer you my experience.

In the US, a fire alarm system for a high rise building is required to activate an alarm signal on the floor of the incident, and the floors immediately above and below the floor of incident. From a door pressure perspective, this means that each stair shaft will have at least 3 doors opened during a fire. Secondly, if you employ the US strategy, I would expect see additional pressure transducers so more accurate air pressure measurements are occurring. My biggest issue is the elevators are pressurized. A piston effect can be created by the movement of the elevators. In the US, elevators will recall to a designated floor upon activation of lobby smoke detectors. The fire service can take control of the elevators and use them for fireground operations. I've seen cases where the elevator shaft pressures were so great that the elevator doors didn't operate.

Without a rational analysis and understanding the design fire I can't offer much more.

 

[UFT12]

Not very active on the subject but what raises concerns for me is the one and only supply point for the stairwells in combination with such building height. It can be quite tedious to balance all these dampers to provide the correct amount of air with even pressures, especially when the supply point is located on one end.

 

[stookeyfpe]

Stack effect will play havoc with this system. The fact the building is sprinklered negates the need for corridor and elevator pressurization in the International Building Code in a Residential high rise building. Again, this may be local building code issue.