Design Concentration
Design Concentration
(OP)
Hi Every one ,
On what basis do we select the design concentration for room to be protected with FM 200. Normally we used to take the design Concentration as 7% at 20 C .Please provide an answer on the basis of NFPA 2001.
On what basis do we select the design concentration for room to be protected with FM 200. Normally we used to take the design Concentration as 7% at 20 C .Please provide an answer on the basis of NFPA 2001.





RE: Design Concentration
RE: Design Concentration
RE: Design Concentration
But per 2001 looks like you need to decide what you are trying to protect and than use the manufacturer to design the system to,
And appears that is what the calculator does just need to plug in the numbers
Also can seek the help of a FPE
RE: Design Concentration
Most Manufacturers have the same design concentration for Class A and C hazards set at 6.25%. This assumes that the system will be automatically activated rather than manually activated. A Manually activated system is required to have a MDC which is 30% above the MEC. The logic follows that the system wouldn't be discharged until someone was somehow notified of the fire, at which time the fire would be considerably larger than what it would be if it were to discharge automatically.
Basing the MDC on 20°C is more dependent on what the end user intends the protected space to operate at, under "Ambient Conditions".
Class B hazards (engine rooms, etc.) require yet a higher design concentration based on testing that the manufacture has performed on the specific fuel.
Regards,
DM
"Real world Knowledge isn't dropped from a parachute in the sky but rather acquired in tiny increments from a variety of sources including panic and curiosity."
RE: Design Concentration
http://www.ttlcompany.com/pages/kiddeproducts/soft...
http://www.eng-tips.com/threadminder.cfm?pid=1529
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