Gases - Methane

Question 1

What is the chemical symbol of Methane?

Answer 1

CH4

Question 2

What is the specific gravity of methane?

Answer 2

0.55

Question 3

What are the characteristics of methane?

Answer 3

Colourless, Odourless and tasteless

Though when mixed with associated flammable gases can have a sweet pleasant smell.

Question 4

Legal limits of Methane?

Answer 4

1% - Diesels out
1.25% - Internal combustion machines to be stopped
2% - Power off
2.5% - Evacuate area

Question 5

What effects does Methane have on a person?

Answer 5

Non-Toxic but does not support life.
Can act as an asphyxiant by displacing air.
In high concentrations can have a narcotic effect.

Question 6

Is Methane Combustible?

Answer 6

Yes
0-5% Burns near an ignition source. 
Lag time at 5-6% is 2 seconds.
Above 15% burns with a bluish flame but wont support combustion.
Owygen nose point is 12.2%

Question 7

What is the Explosive range of Methane?

Answer 7

5-15% in air.

Question 8

How is Methane detected?

Answer 8

IR, GC, Thermal conductivity and Catalytic combustion methaneometers, pellistors
Human senses in high % - Visual and by the ripple effect on the beam of a cap lamp

Question 9

Where is Methane found in a mine?

Answer 9

Seam gas, Fire damp, After damp, selaed areas, heatings. floor strata or blowers