API 653 Exam Chapter 15

API 653 Exam Chapter 15 – Cathodic Protection: API RP 651

Take a Free API 653 Exam Chapter 15 Practice test with Latest Cathodic Protection: API RP 651 Question and Answers

1.

Q1. API 651: corrosion of tanks
In a galvanic corrosion cell, positive metal ions are produced where?

 (a) At the anode

 (b) At the cathode

 (c) From the electrolyte

 (d) All of the above

2.

Q2. API 651: types of corrosion
Large individual corrosion cells caused (for example) by differential aeration of the tank floor cushion (base) are most likely to cause what type of corrosion of the tank floor?

 (a) Overall general wall thinning (probably serious)

 (b) Environmental cracking (SCC)

 (c) Stray current-induced corrosion

 (d) Pitting

3.

Q3. API 651: types of corrosion
Which of these is most likely (according to API 651) to cause differences in potential, leading to the formation of galvanic corrosion cells?

 (a) The temperature effects of welding

 (b) Differing oxygen concentrations

 (c) A clay-rich electrolyte

 (d) An alkaline electrolyte

4.

Q4. API 651: stray current corrosion
Where do stray currents come from?

 (a) Generators

 (b) Overhead power lines

 (c) Electric railways

 (d) All of the above

5.

Q5. API 651: internal corrosion
Which of these criteria is least likely to influence the severity of internal corrosion in a storage tank containing a refined petroleum product?

 (a) Foundation material

 (b) Dissolved gases in the product

 (c) pH of the product

 (d) Conductivity of the product

6.

Q6. API 651: internal corrosion
On balance, which of these corrosion mechanisms is least likely to affect a plain carbon steel tank?

 (a) Pitting

 (b) Environmental cracking

 (c) General wall-thinning corrosion

 (d) Anodic attack

7.

Q7. API 651: soil conditions
A foundation soil with a resistance (resistivity) of 20 000 ohms is considered:

 (a) Very corrosive

 (b) Moderately corrosive

 (c) Mildly corrosive

 (d) Fairly uncorrosive

8.

Q8. API 651: sand pad conditions
Which of these soil conditions is considered very corrosive?

 (a) pH 6 and 2000 ppm sulfates

 (b) pH 3 and 1000 ppm sulfates

 (c) pH 7 and 500 ppm chlorides

 (d) All of the above

9.

Q9. API 651: CP systems
Which one of these statements is most correct? (Yes, these are awkward questions.)

 (a) The objective of any CP system is to make the tank bottom anodic

 (b) The objective of a passive CP system is to make the tank bottom cathodic

 (c) Anodes are more negative than the cathode and so corrode away

 (d) Impressed current CP works better with AC than DC

10.

Q10. API 651: criteria for cathodic protection
Which one of these conditions will give the best protection of a storage tank from galvanic corrosion?

 (a) The tank is at the same potential as the soil surrounding it

 (b) The tank is 850 mV more anodic than the soil surrounding it

 (c) The tank is 850 mV more positive than the soil surrounding it

 (d) The tank is 850 mV more negative than the soil surrounding it

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15.6 API 651: cathodic protection: practice questions

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