Percent O2 in N2 mix permited into flare line
Percent O2 in N2 mix permited into flare line
(OP)
Startup operators use nitrogen to inert vessels and piping during the initial startup operations. Some amount of air would normally remain in the equipment during this process. We have a number in mind and plan to use a number smaller than that. However, we need an authoritative and independent third party document such as an API standard to certify the startup procedures.
What accepted standard documents the oxygen level permitted in the nitrogen where the mix could or would be released into a flare line with a fuel-gas sweep?
Thanks for your input.
John Summerfield, PE
Control Systems
What accepted standard documents the oxygen level permitted in the nitrogen where the mix could or would be released into a flare line with a fuel-gas sweep?
Thanks for your input.
John Summerfield, PE
Control Systems





RE: Percent O2 in N2 mix permited into flare line
I have a curve of my own in a paper on Flare safety, which I'd be happy to send you if you drop me an email at flareman_xs@netzero.net.
David
RE: Percent O2 in N2 mix permited into flare line
I believe flareman meant to says fuel level should be less than 25% of the LEL.
Using the two criteria above will keep you safe
The firm below prepares custom full range composite flammability diagrams to help you pinpoint where you should be operating.
http://www.rccostello.com/explode.html
RE: Percent O2 in N2 mix permited into flare line
http://www.geocities.com/flareman_xs/Gases/Flammability_calc.html
I just posted it today so there has been no feed-back yet. If it needs 'tweaking' let me know.
David