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SECTION 6 - SAMPLING

1. 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
2. 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
3. 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
4. 6.23 Sample containers may be 100% full when the vapour pressure of the product sampled is less than 10 psi.
. a. True
. b. False
.
.
5. 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
.
.
6. 6.62 When upper-middle-lower samples are taken from a tank, what point is the upper sample taken from?
. a. 1/3 of the liquid height from the tank bottom
. b. At the middle of the tank outlet fitting
. c. At the middle of the upper third of the tank contents
. d. 15 cm [6 inches] off the tank bottom
7. 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
8. 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%
9. 6.34 When sampling a shore tank containing a product with an observed density of 1100 kg/m3, [API -2°] and the main concern is water, where would the water proabably be found?
. a. 15 cm [6 ] off the bottom
. b. Stratified between the lower and middle levels
. c. Floating on top of the cargo
. d. No water can be found in oils with a density greater than 1000 kg/m3[with negative API]
10. 6.54 Where is a lower sample is taken from?
. a. The bottom of the tank
. b. Just above the water level
. c. The mid-point of the bottom third of the liquid
. d. At the level of the tank outlet/inlet pipe
11. 6.06 Which product requires particular care when selecting a sample container?
. a. Gasoline
. b. Fuel oil
. c. Benzene
. d. Jet fuel
12. 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
13. 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
14. 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
15. 6.75 When taking samples for vapour pressure testing, samples must not be composited.
. a. True
. b. False
.
.
16. 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
17. 6.59 Which of the following statements about upper, middle, and lower samples is correct?
. a. They can be taken in any order.
. b. They must be taken in the order lower, middle, upper.
. c. They must be taken in the order upper, middle, lower.
. d. They are less reliable than an all-levels sample, no matter how they are taken
18. 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
19. 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
20. 6.63 When drawing upper-middle-lower samples from any tank, which sample should be taken last?
. a. Lower
. b. Middle
. c. Upper
. d. It doesn t matte

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