LOC Dependancy on Pressure & Temperature

[Iomcube]

As per NFPA 69 (

http://hamyarenergy.com/static/fckimages/files/NFPA/Hamyar Energy NFPA 69 - 2002.pdf

) to purge H2 gas (100% pure) I need to maintain following range of N2 gas purity. Given that NFPA (& I failed to get any other document) doesn't describe dependency of temperature & pressure upon LOC (Limiting Oxidant Concentrations) ...how do I know that the range of N2 purity calculate will be adequate for my process conditions?

 

[georgeverghese]

Guidance on this topic of LOC at some other P/T may be found on page 26-54 of Perry Chem Engg Handbook, 7th edition. Note that the value of LOC of 5% for H2 matches exactly with the UFL listed of 75% v/v of H2 in air at 1atm, ambient temp.

 

[Iomcube]

georgeverghese, but I cannot find the term LOC in the index pages of Perry?

 

[georgeverghese]

Presume you are looking at some other edition of Perry. This chapter on process safety is a post 6th edition addition. Dont know if this is in the 8th edition. It may most likely be in the same subsection as where Upper Flammability Limit is discussed in editions 8 and higher.