David,
I am having problems with understanding your point about nitrogen dilution:
"a UEL of 3.7% oxygen in a flammable gas MW 18 (say) becomes a UEL of 9.3% oxygen (about) in a mixture of 4 Nitrogen to 1 gas.."
Do you mean LEL? that is, the addition of N2 to methane (say) pushes...
I am trying to get to a min purge rate in our vent header to keep the O2 conc below the LEL. As I understand, Reduced Husa allows a flammable mixture to exist for some distance in the vent stack from the tip. I guess the assumption is that, if an ignition were to occur then the flame would only...
CHD01, DEP is Design and Engineering Practice (a Shell standard) and by Mr I mean molecular weight of the gas. I used Reduced Husa to work out the min purge rate in the header, this is permitted by another Shell standard (an Expro standard). The DEP gives results similar to the basic Husa method...
I am looking at the purge rate of fuel gas in our vent header. I have used the Shell DEP to calculate the required min purge rate, which is a function of diameter of the vent tip and the Mr of the purge gas. The purge gas is injected at the far end of the vent header.
It appears the same method...
I am looking at the purge rate of fuel gas in our vent header. I have used the Shell DEP to calculate the required min purge rate, which is a function of diameter of the vent tip and the Mr of the purge gas. The purge gas is injected at the far end of the vent header.
It appears the same method...
CHD01, how did you get on with your plant purge rate review? I am looking at the purge rate of fuel gas in our vent header. I have used the Shell DEP to calculate the required min purge rate, which is a function of diameter of the vent tip and the Mr of the purge gas. The purge gas is injected...
