Oil Properties

Question 1

LEL, UEL (aka HEL) - and what is the range between LEL and UEL

Answer 1

Lower Explosive Limit, Upper Explosive limit, between this it is flammable, below LEL it is too lean, above UEL it is too rich.

Question 2

Boiling point of Methane

Answer 2

-162 C

Question 3

Reid Vapour Test what is it

Answer 3

Lab test in which liquid is heated to 37.8 C and the vapour pressure is measured

Question 4

Reid Vapour Test what is its purpose

Answer 4

Allows comparison of vapour pressures of different liquids

Question 5

A closed cup test it used to determine?

Answer 5

The flash point of a liquid

Question 6

The division between volatile and non-volatile liquids is a flashpoint value of which temperature?

Answer 6

60 C

Question 7

What is the Saturated Vapour Pressure

Answer 7

The Pressure of the tank when the rate of condensation matches the rate of evaporation and thus the pressure is at a constant

Question 8

In a Reid vapour test the vapour to liquid ratio is

Answer 8

4:1

Question 9

At atmospheric pressure the boiling point of normal Butane is

Answer 9

-0.5 C

Question 10

Gas Evolution

Answer 10

Process where a gas is produced, i.e. evaporation

Question 11

Hydrocarbons with 6 – 20 carbon atoms exist at normal atmospheric temperature and pressure as:

Answer 11

Liquid

Question 12

Impurities and particulate content of crude oil allow what to happen?

Answer 12

Faster static Charge Dissipation

Question 13

In a Reid vapour test the temperature of the liquid is

Answer 13

37.8°C

Question 14

Threshold Limit Value (TLV) is a time weighted average concentration you may be exposed to based on a

Answer 14

8 hour day and 40 hour week

Question 15

Evaporation occurs when

Answer 15

Molecules leave the vapour and go into the liquid

Question 16

Petroleum vapour concentration of 100% LEL will rapidly cause symptoms of drunkenness, unconsciousness and death. 100% LEL is equivalent to

Answer 16

1.0% vol

Question 17

Boiling vs Evaporation

Answer 17

Evaporation is slower and only occurs at the surface

Question 18

Closed cup test what is it

Answer 18

Test done in lab to work out the flash point

Question 19

Knowing the saturated vapour pressure of a liquid allows you to predict

Answer 19

The boiling temperature of the liquid

Question 20

flammable range diagram the minimum Oxygen content to support combustion is

Answer 20

11% oxygen

Question 21

The flammable range of petroleum vapours in air is

Answer 21

1 – 10% Vol

Question 22

Saturated vapour pressure occurs when?

Answer 22

The rate of condensation is equal to the rate of evaporation

Question 23

The main hazard of petroleum cargoes is considered to be

Answer 23

Flammability