module 17

Question 1

what determines how fast a fire can travel?

Answer 1

.. Type & quantity of fuel
•Strength of ignition source
•Availability of oxygen
•The size of the compartment.

Question 2

flame height 1 side on wall?

Answer 2

x 2 compared to fire in centre of room

Question 3

flame height in corner

Answer 3

x3 compared to fire in centre of room

Question 4

describe flashpoint

Answer 4

the lowest temp at which a liquid gives off enough vapours to form as an ignitable mixture

Question 5

what is the flammable range of hexane?

Answer 5

1.2 - 7.7

Question 6

what is the flammable range of hydrogen

Answer 6

4 – 75

Question 7

what is the flammable range of Methane

Answer 7

5 - 15

Question 8

what is the flammable range of pentane?

Answer 8

1.5 - 8

Question 9

what is the flammable range of propane

Answer 9

2.1 - 9.5

Question 10

Define relative density ?

Answer 10

Ratio of the molecular weight of a substance to that of a standard substance under specified conditions.

Solids & liquids Water (18.01)
Vapours and Gases Air (28.97)
Methane (16)

16
28.97 = 0.55

Question 11

the mechanisms of explosions can only occur?

Answer 11

.. The substance is combustible
•Is airborne and can mix with air
•Able to propagate flame
•Concentration with in explosive range
•Ignition source of sufficient energy
•Atmosphere to contain sufficient oxygen.

Question 12

what controls can minimise the risk of explosions?

Answer 12

.. Good housekeeping
•Good ventilation
•Control of detonating sources
•Safe storage and handling explosive material
•Suppression
•Inerting
•Venting.