Stair Case Pressurization Calculation

This is the first time I'm ever hearing about staircase pressurization calculations. Are there lifts/ escalators for this building? Does the pressurization calculations apply to them also? What is the purpose of this pressurization calculations? Can it not be done with the simple barometric formulae?

Hello sam,

The purposed of pressurizing the staircase is to prevent the fire from going inside the stairshaft since during fire in high rise building the staircase are the main exits. This is mechanically operated by motorized fire dampers.

By the way have seen a high rise building without lift/elevator?

Hello Rinus, What I meant was, lifts and escalators go off service in case of fire. In some cases, escalators double up as staircases too. Is it necessary to maintain the pressure there also? I am ignorant on this subject

Hi Sam, It is not necessary to maintain the pressure in both lifts and escalators since during fire lifts and escalators are not allowed to used. Only fire marshals are authorized to use lifts.

Thanks Rinus for your reply. It has improved my knowledge. Thank you once again

This is first time I am coming across a CIVIL ENGINEER doing HVAC Calculation, please dont try you will end up confusing your boss, just tell him this is HVAC engineers job, Sorry ,In Gulf countries this is the way they work,

Thanks

There is procedures to do, required some parameters to do, and it should be done by HVAC engineers.

why calculate usually design pressure is 3-5 pascals

just make sure air distribution in all staircase diffuser are all of equal amount meaning you need air balancing and not only pressurizing the staircase u need also extraction because this is design for fire scape

Staircase pressurisation is required at the time of fire in the building to prevent fire to spread through it. Because staircase is used for exit from building as lifts will be in firemode. Normally staircase pressure is maintained at 3-5 Pascals by use of blowers, so that fire should not spred over it during opening of doors.

Hence there is no use of tamperature factor & ambient air temp as its pressure need to be maintained not its temperature.