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SECTION 6 - SAMPLING

1. 6.28 During a marine custody transfer, which of following is the preferred sample to best represent the cargo transferred?
. a. A composite of shore tank samples.
. b. A shore tank sample after a transfer
. c. Automatic pipeline samples obtained throughout the transfer
. d. Vessel composite samples
2. 6.44 A sample can or bottle should never be capped if it is more than 95% full.
. a. True
. b. False
.
.
3. 6.53 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
4. 6.21 Before sampling oil in a tank, it is necessary to locate the oil/water interface.
. 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. 6.63 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
7. 6.71 The controller on an automatic sampler is a device that governs the operation of the sample extractor.
. a. True
. b. False
.
.
8. 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
9. 6.74 What should be used to take a sample that is to be tested for vapour pressure?
. a. A zone sampler
. b. A glass bottle with suitable cage or weight
. c. A dedicated closed or restricted vapour pressure sampler
. d. Answers b. and c. are correct
10. 6.75 When taking samples for vapour pressure testing, samples must not be composited.
. a. True
. b. False
.
.
11. 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
12. 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
13. 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
14. 6.09 Jet fuel should not be sampled with equipment that contains brass, copper or copper alloy.
. a. True
. b. False
.
.
15. 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
16. 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
17. 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
18. 6.70 Before testing, the product in the receiver of an automatic sampler must be mixed.
. a. True
. b. False
.
.
19. 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
20. 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

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