SECTION 6 - SAMPLING
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1. 6.20 What is the name of a sample obtained by lowering an unstoppered container to the draw-off level of a tank and withdrawing the container without stopping?
    a. Multi-level sample
    b. Running sample
    c. All-levels sample
    d. Composite sample
2. 6.44 A sample can or bottle should never be capped if it is more than 95% full.
    a. True
    b. False


3. 6.78 Why is it important to label all samples as soon as possible?
    a. National and/or local Government regulations require it.
    b. An incorrectly labeled sample could generate a legal action
    c. It is easy to label samples incorrectly if they are not labelled promptly
    d. Answers a., b. and c. are all correct
4. 6.41 If the sample bottle comes up full when taking a running sample what action should be taken?
    a. Pour out 20% - 25% of the sample, then cap and label the sample
    b. Cap and label sample then place it in an ice chest
    c. Make a special notation on the sampling report
    d. Discard the sample and re-sample the tank so that the bottle is about 80% full
5. 6.16 Why are free water samples important?
    a. To check for contaminated water under gasoline
    b. To determine the likely source of the free water
    c. To determining the influence of free water on the API gravity of a crude oil cargo
    d. Answers a., b. and c. are all wrong
6. 6.02 Which of the following types of containers should never be used for handling or storage of jet fuel samples?
    a. Clear glass bottles
    b. Amber glass bottles
    c. Plastic bottles
    d. Epoxy lined metal cans
7. 6.52 At what level in a product tank is a top sample taken?
    a. Middle of the upper third of the liquid
    b. 15 cm [6 inches] above the tank outlet
    c. Middle of the lower third of the tank
    d. 15 cm [6 inches] below the surface of the liquid
8. 6.27 When sampling heavy fuel oil, crude oil or petroleum products in a tank with non-liquid or sediment deposits on the bottom, why may manual samples not be representative?
    a. Because the material may be non-homogeneous
    b. Because the concentration of entrained water is higher near the bottom
    c. Because the interface between the oil and water is difficult to measure accurately
    d. Answers a., b. and c. are all correct
9. 6.15 When should a free water sample be taken ?
    a. When requested by the customer.
    b. They are not necessary.
    c. Immediately after every loading, except for chemicals.
    d. Whenever there is a sufficient quantity to sample
10. 6.46 Before taking a line sample it is important to?
    a. Ground your equipment
    b. Flush the tap and sample line until they are purged
    c. Call your supervisor
    d. Answers a., b. and c. are all correct
11. 6.39 What is the principal disadvantage of using a sampling can/beaker to sample marine vessel tanks?
    a. They are too heavy to hoist up and down
    b. If one tank is contaminated, subsequent samples could also become contaminated
    c. There is no cap that fits them
    d. They are too expensive and might be lost in the tank
12. 6.81 What is the most important feature of a container to be used for a sample of gasoline/naphtha for vapour pressure testing?
    a. It should be made of glass
    b. It should be made of plastic
    c. It should be made of metal
    d. It should be fitted with a vapour-tight lid
13. 6.73 Both free water and entrained water are found in the sample taken by an automatic in-line sampling system.
    a. True
    b. False


14. 6.65 At what vertical location in the liquid is an upper sample taken?
    a. 1/6 of the liquid depth below the surface of the liquid
    b. 25 mm [1 inch] below the surface of the liquid
    c. 150 mm [6 inches] below the surface of the liquid
    d. The middle of the lower third of the tank
15. 6.53 A bottom (dead bottom) sample may not always be taken at the very bottom of a tank. What is the correct procedure?
    a. Always specify the location where the sample was taken, for example Approximately 15 cm [6 inches] from the bottom
    b. Always take a bottom sample 5 cm [2 inches] off the actual bottom because that is where the neck of the bottle will rest when the bottle is on its side
    c. Always use a dead bottom sampler to draw bottom samples
    d. Always use a zone sampler to draw bottom samples
16. 6.03 Which of the following types of sample container should be used to obtain an initial first foot sample?
    a. Clear glass bottles
    b. Amber glass bottles
    c. Plastic bottles
    d. Epoxy lined metal cans
17. 6.68 Which of the following items are parts of an automatic sampling system?
    a. Probe
    b. Receiver
    c. Controller
    d. Answers a., b. and c. are all correct
18. 6.05 Which of the following types of container closure devices should not be used with glass bottles?
    a. Plastic screw caps
    b. Rubber stoppers
    c. Metal screw caps
    d. Cork stoppers
19. 6.43 Samples should not be taken from an unslotted or unperforated standpipe.
    a. True
    b. False


20. 6.79 When should a sample be labelled?
    a. On returning to the office
    b. After removing them from the sample transportation box.
    c. Just before leaving the facility
    d. Immediately after it is obtained
21. 6.80 When drawing gasoline/naphtha samples for vapour pressure testing which comment(s) apply to the sample containers?
    a. They should be kept as cool as possible
    b. They should be filled to approximately 75% level
    c. They should be fitted with vapour tight lids
    d. Answers a., b. and c. are all correct
22. 6.12 What type of equipment would you use to sample liquid in a 55-gallon drum?
    a. A dead-bottom sampler
    b. A bottle and cage.
    c. A sampling tube.
    d. A dipper sampler.
23. 6.49 At what point is a bottom (dead-bottom) sample taken?
    a. 15 cm [6 inches] below the outlet
    b. 10 cm [4 inches] below the outlet
    c. At the lowest point in the tank
    d. Immediately above the free water level
24. 6.11 Which equipment is best for sampling free water in a crude oil tank?
    a. Zone sampler
    b. Dead bottom sampler
    c. Bottle and sample cage
    d. Weighted bottle and cord
25. 6.61 When drawing upper-middle-lower samples from any tank, which sample should be taken first?
    a. Lower
    b. Middle
    c. Upper
    d. It doesn t matter
26. 6.25 How is an all-levels sample obtained?
    a. By submerging an unstoppered container at a uniform rate to a point near the tank draw-off level then raising it so that it is no more than 85% full on emerging from the liquid.
    b. By blending tank upper, middle and lower samples.
    c. By submerging a stoppered container to a point as near as possible to the draw-off (suction) level, then opening the sampler and raising it at a rate such that it is about 80% full on emerging from the liquid.
    d. By submerging a stoppered container to the bottom of the product in a tank, then opening the sampler and raising it at a uniform rate until the container is full.
27. 6.50 What is the name for a sample taken at a specific point in a tank?
    a. An all level sample
    b. A running sample
    c. A spot sample
    d. A single-tank composite sample
28. 6.45 When taking liquid samples for hydrogen sulphide testing in accordance with IP 570 [ASTM D7621] what is the approximate level to which sample containers must be filled?
    a. 50%
    b. 80%
    c. 95%
    d. 100%
29. 6.48 Where may volumetric composite samples be prepared?
    a. Only in a laboratory
    b. On board a vessel if separate samples are taken to the laboratory for analysis
    c. Preferably in a laboratory but also at another location if conditions and equipment allow the sample to be composited in proportion to the volume of material in each compartment
    d. On board a vessel for crude oil cargos only
30. 6.04 Which of the following products should be stored in amber bottles?
    a. Gasoline, Diesel, Jet A, Styrene
    b. Fuel oil, Gasoil
    c. Heavy aromatics
    d. No. 6 F.O, Heavy Fuel Oil
31. 6.13 Which of the following samples could be taken with a zone sampler?
    a. U, M, L samples
    b. Running samples
    c. Spot samples
    d. Answers a., and c. are correct
32. 6.51 What is the term for a blend of samples from different shore tanks, mixed proportionally for testing?
    a. A composite spot sample
    b. A loading sample
    c. A clearance sample
    d. A multiple tank composite sample
33. 6.08 For which products is it recommended to rinse the container with the liquid to be sampled before drawing the sample?
    a. Jet fuel samples
    b. Petrochemical samples
    c. Vapour pressure samples
    d. Answers a., b. and c. are all correct
34. 6.10 What equipment is preferred to lower a sample bottle to the required level?
    a. Ullage tape
    b. Natural fibre cord or non-sparking chain marked to indicate when the correct level has been reached
    c. Innage tape
    d. Brass sampling cage
35. 6.69 The sample receiver of an automatic sampling system must be inspected to ensure that it is clean and dry before it is used.
    a. True
    b. False


36. 6.60 When upper-middle-lower samples are taken from a tank, from what point is the lower sample taken?
    a. 1/3 of the liquid height from the tank bottom
    b. At the middle of the tank outlet fitting
    c. 1/6 of the liquid height from the tank bottom
    d. 150 mm off the tank bottom
37. 6.38 When taking a first foot sample of a jet fuel cargo it is recommended to
    a. Use a clear bottle
    b. Use only steel sampling cans
    c. Use only a clean zone sampler
    d. Use an amber bottle
38. 6.83 According to ISO 3171 and API Chapter 8.2 what is the number of grabs suggested when using an automatic sampler for transfers lasting over 6 hours?
    a. 100,000
    b. 10,000
    c. 1,000
    d. 100
39. 6.70 Before testing, the product in the receiver of an automatic sampler must be mixed.
    a. True
    b. False


40. 6.21 Before sampling oil in a tank, it is necessary to locate the oil/water interface.
    a. True
    b. False


41. 6.76 When drawing a running sample for RVP, how full should the sample bottle be when withdrawn from the tank?
    a. 50% - 60% full
    b. 70-80% full
    c. 80-90% full
    d. 100% full
42. 6.71 The controller on an automatic sampler is a device that governs the operation of the sample extractor.
    a. True
    b. False


43. 6.06 Which product requires particular care when selecting a sample container?
    a. Gasoline
    b. Fuel oil
    c. Benzene
    d. Jet fuel
44. 6.32 For a running sample to be taken correctly, the sample container must be?
    a. At least half full
    b. A zone sampler
    c. A bottle and cage
    d. Approximately 70% to 85% full
45. 6.30 A storage tank is manually gauged and found to contain 4.0 metres [12 feet] of product. How many spot samples as a minimum should be obtained from this tank?
    a. 2 (Upper and lower)
    b. 3 (Upper, middle and lower)
    c. 1 (Middle)
    d. None
46. 6.82 Why is a first foot sample taken?
    a. To determine the quality of the product in the shore tank
    b. To confirm that the vessel s tanks are clean
    c. To confirm that the product in the shore pipeline meets the specification
    d. As an indication that the cargo is has not been contaminated by residues from the ship s manifold or lines
47. 6.58 Where is an upper sample taken from?
    a. The surface of the liquid
    b. 150 mm [6 inches] below the surface of the liquid
    c. The mid-point of the upper third of the liquid
    d. Anywhere in the top portion of the tank
48. 6.36 What laboratory test will most likely be affected by not using dedicated sampling equipment for individual products or product groups?
    a. colour
    b. flashpoint
    c. sulphur
    d. Answers a., b. and c. are all correct
49. 6.47 During preliminary sampling of a shore tank that will be used to load a vessel, you should also obtain a tape or side gauge reading.
    a. True
    b. False


50. 6.17 A representative sample is a portion extracted from the total volume that contains its constituents in the same proportions as those present in the total volume.
    a. True
    b. False


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