Properties of Flammable Liquids

Question 1

What is LEL?

Answer 1

The concentration of flammable gas/vapour in the air is below the limit - no explosion will occur

Question 2

What is UEL?

Answer 2

Percentage of flammable gas/vapour in air is above the limit - no explosion will occur

Question 3

When will combustion occur?

Answer 3

Combustion will only occur if the flammable mixture comprising fuel, in the form of gas/vapour and air are within certain limits

Question 4

What is Flash Point?

Answer 4

Lowest temperature at which sufficient vapour is given off a liquid, to form a flammable mixture with air. Can be ignited by an arc, spark or naked flame

Question 5

What is ignition temperature?

Answer 5

Minimum temperature at which a flammable material will spontaneously ignite

Question 6

What is Auto - ignition temperature?

Answer 6

Minimum temperature required to ignite a gas or vapour in air without a spark or flame being present.

Question 7

What is Temperature Classification?

Answer 7

Maximum temperature which any part of the apparatus will reach, when operating within normal design ratings at an ambient temperature not 40 degrees.