Staircase Pressurization

[hipposs]

Hello Guys,

I would like to ask about the staircase pressurization fans design.
Is it based on the air changes per hour design? or it has another concept?

Best Regards

[Brian_UK]

HI, there are different codes for different countries so you need to establish what you code requirements are.

For a brief look at the differences and pitfalls have a look here...

http://www.eng-tips.com/viewthread.c...=162828&page=1

[frank]

I have the BS regs in my office if you can be a bit more specific.
The last one I designed (Thurrock, UK) was based on an escape velocity at the door seals

[Brian_UK]

I think they generally aim for around 50Pa with two or three doors open but I'm not 100% sure now, long time since I had to commission one.

[hipposs]

I have read about something concening the 50 Pa design consideration but I am trying to figure out a way to design this system on which I have no data thus I can not be specific I need some design basis in order for me to be specific.

[Brian_UK]

Think of the staircase as a very large duct.

Think of the doors as very large air terminals (grilles).

The terminal is an 'orifice'.

Calculate the airflow required to generate a 50Pa difference across that orifice using the very large duct.

If you do not have any design data then you will have to go out and measure a staircase with a tape measure and start from there.

If you are trying to provide a price to a consultant then get them to give you the requirements of the system. They should have 'designed it' already and have figures available.

Good luck with it.