flammable gas mixture

[rika kose]

Gas mixture: 2 flammable gases A and B
A: LEL:2 % UEL: 12%
B: LEL: 1% UEL:8%
Gas mixture: LEL: 1.7% UEL 10.5%

Calculate based on the partial vapor pressure, we know gas A vol percentage is 15%, B vol.percentage is 2%.
Mixture vol% 12. Gas B is above LEL.

Is this mixture flammable ?

 

[LittleInch]

Student work?
There is a forum for that.
But looks flammable to me

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[rika kose]

Not student work.
Fire safety study on site.
But thanks for the reply

 

[LittleInch]

It was just the way the question was worded - "calculate."

They are really quite low percetages.

What is this stuff?

Are you saying you have a mixture of gas, in air I assume which is 15" Gas A and 2% gas B?

Pure Gas?

I think you might need to look at your post and re qword it so that there's less confusion....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[jari001]

I think a reasonable assumption (though we know nothing about the process) is that you cannot guarantee there will be no spatial separation of the gas such that components A and B exist separately but mixed with ambient air. Therefore, even if the mixture of the two gases can't support combustion since the mixture volume % is above the UEL, you should assume a fire risk is present.

More to the point LittleInch raised - the low percentage values for these ranges - I would think the process should already have fire case mitigation/prevention (e.g. Class I Div II, ventilation). A small leak of either A or B seemingly would immediately be within the flammable range.