1) Define the following term & locate them on the phase envelope of the given HCS gas:a) Critical pointb) Cricondenthermc) Cricondenbard) Dewpoint at 40 bar

2) Define these terms & mention all processes used in:a) Gas dewpointingb) Gas dehydrationc) Gas sweetening

3) A sales gas is desired to be free from liquids to meet sales spec, depending on the gas phase envelope attached determine whether this gas is on spec or off spec?

4) If the sales gas in the previous question was off spec, give the field operators the appropriate advices in the following plants for the gas to be on spec

a) Absorption (lean oil)b) Refrigerationc) Cryogenic (J-T)d) Turbo-expandere) Adsorption

5) It is required to dehydrate & sweeten a sales gas to meet spec, and then transport it for a long distance.Draw a full diagram of the process & define the process steps

6) A gas is compressed from 4 bar to 20 bar, its temperature before compression was 25 oC & its flow rate was (40 MMSCFD).

Determine:

a) compression ratiob) temperature after compression relative to 25 oCc) Flow rate after compression relative to (40 MMSCFD)

7) A gas was allowed to expand through expansion valve from 20 bar to 5 bar, Determine its state after expansion (Gas or Liquid)?

8) A gas with a given composition as follows:

Determine its state

Mole fraction KC1 0.2C2 0.3C3 0.15CO2 0.35

9) Mention two types of pumps & their application10) Write short notes on natural gas hydrates11) Draw required control units to control

a) pressure of outlet gasb) Level of liquid within the separatorc) Flow rate variation for the feed stream

12) Mention approximately the composition of LPG?13) What is the state of LPG inside home cylinders?14) Define (Ideal gas-two types of flow inside pipes)

Interview questions

15) Why nitrogen is used in aviation tires instead of air?16) Draw a separator & apply flash calculations17) If the feed to the separator is 40 MMSCFD & the overhead product flow rate is 10

MMSCFD, then the bottom product flow rate is 30 MMSCFD? (True or False)

Important:Compositions given in question 9, values in any problem are hypothetical as we weren’t allowed to copy the exam.

Feed

Liquid

Gas