Refinery Lab Technician in GCC Country

A. Teknisi Lab Refinery

(Berdasarkan pengalaman pribadi dan beberapa rekan Editor).

1. Tell me about yourself?

“Well, My name is ____. I’m currently working at XYZ Company as ____ (title) and I specialize in doing ___. The reason I applied for this job is I saw ___ on the job description and I think I would be able to help you ___ and ___. One of my key accomplishments in my current role was helping my employer do ___, and I’m confident I can help your team get similar results here.”

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2. What is Boiling Point?

temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.

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3. What is Distillation?

is the process of separating the components or substances from a liquid mixture based on the boiling point of every component.

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4. What is Density?

is defined as the ratio between mass and volume or mass per unit volume. It is a measure of how much stuff an object has in a unit volume (cubic meter or cubic centimeter). Unit:  g/mL or kg/m3

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5. What is Method for Analysis Diene Value?

UOP326

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6. What is Method for Analysis Flash Point?

ASTM D93

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7. What is Method for Analysis BSW?

ASTM D4007

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8. What is Method for Analysis Bromine Number?

ASTM D1159

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9. What is Method for Analysis Total Sulfur in Petroleum Product?

ASTM D5453

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10. What is Method for Analysis Metals in Fuel Oil?

UOP389

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11. What is Method for Analysis Lead in Naphtha?

UOP 952

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12. What is Method for Analysis Lead in ULG?

ASTM D5059

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13. What is Method for Analysis Total Nitrogen in Petroleum

ASTM D4629

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14. What is the range of method ASTM D5453?

1-10000ppm

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15. What is Method for Analysis Mercury in Gas and Petroleum Product?

UOP938

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To be continued…


16. What is ISO 17025?

ISO is general management requirement for calibration and testing laboratory.

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17. What is Method for Analysis Diene Value?

UOP326

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18. What is <strong>ISO 17025</strong>?

ISO is general management requirement for calibration and testing laboratory.[/spoiler

19. What is Method for Sulfur Analysis in GAs ?
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ASTM D 6228 for Trace sulfur in natural Gas (LNG).  ASTM D 5623 for Sulfur Compounds in Light Petroleum Liquid (LNG) Both by SCD-PFPD Detector.

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20. What is Mormality <em>Concentrated sulfuric acid</em>  (98% of H2SO4)?

It is equal to is 18.4 M or It is equal to is 36.8 N

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21. What is Mormality conc. HCl (36.5% of HCl)?

It is equal to is 11.8M

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22. What is Normality of NaOH 50%?

It is equal to 12.5N

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23. What is factor to change 1% to ppm?

1% is equal to 10000 ppm

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24. What is TSS and How the Measurement Principle?

TSS is the dry-weight of suspended particles, that are not dissolved, in a sample of water that can be trapped by a filter that is analyzed gravimetrically using a filtration apparatus.

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25. What is TSS and How the Measurement Principle?

TSS is the dry-weight of suspended particles, that are not dissolved, in a sample of water that can be trapped by a filter that is analyzed gravimetrically using a filtration apparatus.

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26. What is Measurements?

is a collection of quantitative or numerical data that describes a property of an object or event.

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27. What is Gas chromatography?

Is a method of separating and analyzing compounds that can be vaporized without decomposition.

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28. What is Ion chromatography?

Is a method of separating and analyzing based on the characteristic interaction between sample’s ions, mobile phase and stationary phase.

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29 What is KF Bunsen reaction ?

The Bunsen reaction is a chemical reaction that describes watersulfur dioxide, and iodine reacting to form sulfuric acid and hydrogen iodide: 2H2O + SO2 + I2 → H2SO4 + 2HI

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30. What is KF Bunsen reaction pH?

The Bunsen reaction optimum pH of 5-8

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31. What purpose of LiOH in BOD reaction?

To absorb CO2 that is produced from bacteria.

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32. True or false COD more than BOD?

True. It is usually 2-4 times depends on the water itself.

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33. Which more strong and why HCl,HNO3,H2SO4?

pKa of these acids in decreasing order is HNO3>HCl>H2SO4,which means the H2SO4 is the strongest acid.

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34. What is factor to change 1% to ppm?

1% is equal to 10000 ppm

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35. What is <em>API gravity</em>?

API gravity, is a measure of how heavy or light a petroleum liquid is compared to water.

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36. What is definition of osmosis?

is the process where solvent molecules move through a semipermeable membrane from a dilute solution into a more concentrated solution (which becomes more dilute).

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37. What is definition of density?

Density is defined as the ratio between mass and volume or mass per unit volume. It is a measure of how much stuff an object has in a unit volume (cubic meter or cubic centimeter). Unit:  g/mL or kg/m3

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38. What is definition of chromatography?

a process in which a chemical mixture carried by a liquid or gas is separated into components as a result of differential distribution of the solutes as they flow around or over a stationary liquid or solid phase.

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39. What is definition of liquified gas?

A plasma is a hot ionized gas consisting of approximately equal numbers of positively charged ions and negatively charged electrons.

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40. What is definition of liquefied gas?

is a gas that has been turned into a liquid by cooling or compressing it.

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41. What is definition of COD?

is an indicative measure of the amount of oxygen that can be consumed by chemical reactions in a measured solution.

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42. What is definition of BOD?

is the amount of dissolved oxygen needed (i.e. demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.

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43. What is definition of TOC?

is the amount of carbon found in an organic compound.

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44. What is definition of VOC?

are organic chemicals that have a high vapor pressure at ordinary room temperature.

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45. What is definition of specific gravity?

is the ratio of the density of a substance to the density of water.

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46. What is definition of bromine index/no.?

bromine number—the number of grams of bromine that will react with 100 g of the specimen under the conditions of the test. Bromine index is bromine number divided by 1000.

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47. What is method number for of bromine index/no.?

ASTM D1159 for 95-165 Br. NoASTM D2710 for les than 0.5 Br. No

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48. What is pH and How the Measurement Principle?

Definition: is a measure of hydrogen ion concentration, a measure of the acidity or alkalinity of a solution. (Without unit). Principle: measuring hydrogen concentration by separating it from solution using membrane electrode.

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49. What is water conductivity and How the Measurement Principle?

Definition: is a measure of water’s capability to pass electrical flow (Unit: µS/cm). Principle: measuring electron flow using Wheatstone bridge circuit with platinum electrode in each stream.

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50. What is TSS and How the Measurement Principle?

TSS is the dry-weight of suspended particles, that are not dissolved, in a sample of water that can be trapped by a filter that is analyzed gravimetrically using a filtration apparatus.

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51. What is TDS and How the Measurement Principle?

Definition: is a measure of the dissolved combined content of all inorganic and organic substances present in a liquid in molecular, ionized or micro-granular (colloidal sol) suspended form. Principle: gravimetric method by Filtering the sample using 0.45 µm filter and evaporating up the filtrate solution in 105°C.

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52. What is Flash Point?

is the lowest temperature at which vapors of the material will ignite, when given an ignition source.

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