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?

 
 
 
 

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?

 
 
 
 

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?

 
 
 
 

4.

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

 
 
 
 

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?

 
 
 
 

6.

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

 
 
 
 

7.

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

 
 
 
 

8.

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

 
 
 
 

9.

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

 
 
 
 

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?

 
 
 
 

Question 1 of 10

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15.6 API 651: cathodic protection: practice questions

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