Design code of positive pressure on a enslosed building

[jamesbanda]

Dear All,

I am looking for a design code or reference standard relating to maintaining positive pressure on an enclosed building.

We are designing a plant which is enclosed becuase we handle powders and have a filter press. We are planning on maintaining positive pressure but we are not clear on what guidelines we should apply to set PRESSURE.

Is there an API standard, best pratice we could refer to..

The flash points of chemicals in the building are 70-80 C.

 

[roker]

jamesbanda,

I would try air conditioning or clean rooms forums, if you have some approach to Intel engineers they may help.

regards,
roker

 

[zerosum]

It would seem to me you have to decide what you want to accomplish by pressurizing the enclosed plant or parts thereof. Normally pressurization in buildings is used to control the air flow to keep harmful agents (toxic chemicals, microrganisms, flammibles, contaminants) out of specific areas of a building such as in labs or hospitals, or to keep such agents from entering (as in control rooms). DP's are typically in tenths of inches to inches of water.

One good reference is "Industrial Ventilation" by the Conference of Governmental Industrial Hygenists. Also ASHRAE's HVAC Application Manual.

 

[zerosum]

That's the American Conference of Governmet Industrial Hygenists

 

[JLSeagull]

NFPA 496
API 500
NFPA 70

 

[HEC]

In Pharma Industry a norm of around 15-25Pa across each door is considered a good starting point. By this I mean first set of doors from outside eg entrance to airlock is 15-25Pa above outside (ambient) pressure, next set of doors eg airlock to process room is 15-25Pa above the airlock which is 30-50Pa above ambient pressure. This is a guide that is generally used for contaminant control.
Cheers


Mark Hutton