SECTION 6 - SAMPLING
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1. 6.07 Which documents contain guidance for selecting sample containers?
    a. API MPMS Chapter 8.1 / ISO 3170
    b. IP 476 / API MPMS Chapter 8.2 / ISO 3171
    c. API MPMS Chapter 8.3
    d. API MPMS Chapter 8.4
2. 6.43 Samples should not be taken from an unslotted or unperforated standpipe.
    a. True
    b. False


3. 6.57 A storage tank was manually gauged and found to have a product innage of 9.000 m [38 feet 6 inches]. The tank gauge height is 12.000 m [48 feet 10 inches]. At what innage level should the upper product spot sample be obtained?
    a. 7.500 m [32 feet 1 inch] from the tank bottom
    b. 2.000 m [5 feet 5 inches] below the surface of the product
    c. 11.850 m [40 feet 9 inches] from the tank bottom
    d. 150m [6 inches] below the surface of the product
4. 6.72 According to IP476/ISO 3171 and API MPMS Ch 8.2, sampling in a time proportional mode is acceptable if the flow rate variation is less than ±10 percent of the average rate over the entire parcel.
    a. True
    b. False


5. 6.64 When drawing upper-middle-lower samples from any tank, which sample should be taken second?
    a. Lower
    b. Middle
    c. Upper
    d. It doesn t matter
6. 6.21 Before sampling oil in a tank, it is necessary to locate the oil/water interface.
    a. True
    b. False


7. 6.66 An automatic in-line sampling system will collect free water and entrained water.
    a. True
    b. False


8. 6.40 What is the principal reason for taking bottom (deadbottom) samples.
    a. To determine if sediment is present
    b. To obtain a sample for sulfur & viscosity determination
    c. To locate any free water not identified by water paste
    d. Bottom samples need not be taken if water paste indicates that no water is present
9. 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
10. 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
11. 6.55 A storage tank was manually gauged and found to have a product innage of 12.000 m [38 feet 6 inches]. The tank gauge height is 13.000 m [48 feet 10 inches]. At what innage level should the lower spot sample be obtained?
    a. 150 mm [6 inches] from the tank bottom
    b. At the outlet (suction) level
    c. 2.000 m [6 feet 5 inches] from the tank bottom
    d. 4.000 m [12 feet 10 inches] from the tank bottom
12. 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
13. 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
14. 6.24 After taking a spot sample of gasoline, it is permissible to immediately pour off some of the product to allow room in the container for expansion.
    a. True
    b. False


15. 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
16. 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
17. 6.33 Which of the following statements is correct?
    a. Closed and restricted sampling equipment is essentially the same
    b. Restricted sampling equipment may allow small amounts of vapour to escape to atmosphere
    c. Closed sampling equipment is designed to prevent any escape of vapour to atmosphere
    d. Answers b. and c. are correct
18. 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
19. 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
20. 6.44 A sample can or bottle should never be capped if it is more than 95% full.
    a. True
    b. False


21. 6.18 Why do sampling standards recommend that a vapour space should be left at the top of each sample container?
    a. To permit the surface of the liquid to be visible in the laboratory
    b. To allow space to test the vapour content of the sample
    c. To allow space for safe expansion of the liquid
    d. To avoid the loss of light components
22. 6.31 Why should sampling cord not be allowed to fall on the deck or tank roof?
    a. It could become contaminated
    b. It could make a mess that could cause a danger of slipping
    c. The cord could become damaged
    d. Answers a. and b. are correct
23. 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
24. 6.22 Before sampling a clean product or petrochemical, the container should always be rinsed with the product when possible.
    a. True
    b. False


25. 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
26. 6.14 When sampling volatile liquids, why is it generally better to use a sampling cage and bottle and not a weighted sampling can/beaker?
    a. The equipment is easier to handle
    b. A can sample is probably less representative
    c. Loss of light ends is likely when the sample is transferred from the can/beaker
    d. Sample bottles are readily available
27. 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
28. 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
29. 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
30. 6.29 After obtaining a tank running sample, the inspector notices that the sampling bottle is full on withdrawing it from the tank. What should the inspector do?
    a. Pour some of the sample into a second container
    b. Pour some of the sample out of the bottle
    c. Retake the sample to comply with the method
    d. Answers a., b. or c. are all correct
31. 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
32. 6.56 A storage tank was manually gauged and found to have a product innage of 11.500 m [38 feet 6 inches] . The tank gauge height is 12.500 m [48 feet 10 inches] . At what innage level should the middle product spot sample be obtained?
    a. 6.750 m [12 feet 10 inches] from the tank bottom
    b. 5.750 m [19 feet 3 inches] from the tank bottom
    c. 6.250 m [24 feet 5 inches] from the tank bottom
    d. 6.250 m [6 feet 5 inches] below the surface of the product
33. 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
34. 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
35. 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
36. 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
37. 6.35 Why is a running sample not acceptable if the container is brought up full?
    a. There is no way to tell when the bottle filled up
    b. There would be too much oil to test the density
    c. There is a chance of contamination from the bottle cap
    d. As the bottle warms up, it could shatter
38. 6.37 Since the volume of material in the tank does not affect laboratory analysis, tanks that are sampled do not need to be gauged.
    a. True
    b. False


39. 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
40. 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
41. 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
42. 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
43. 6.19 What is the name of a sample obtained by lowering a stoppered container to the draw-off level of a tank, removing the stopper and withdrawing the container at a steady rate?
    a. Spot sample
    b. Running sample
    c. All-levels sample
    d. Composite sample
44. 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


45. 6.06 Which product requires particular care when selecting a sample container?
    a. Gasoline
    b. Fuel oil
    c. Benzene
    d. Jet fuel
46. 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
47. 6.77 When/where should samples be labeled?
    a. In the laboratory.
    b. Immediately after the sample is obtained.
    c. Before transportation to the laboratory.
    d. Immediately upon arrival in the laboratory
48. 6.67 Automatic samplers can be either time proportional or flow proportional.
    a. True
    b. False


49. 6.42 When taking a running sample of a clear product such as jet fuel or a water-white chemical what procedure should you follow?
    a. Rinse the inside of the sample bottle with product prior to taking the sample
    b. Take a sample in a clear bottle to visually check the colour
    c. Ensure that product running down the sample cord cannot contaminate the sample
    d. Answers a., b. and c. are all correct
50. 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
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