Section 5 - Reasons to Inspect

Question 1

Regulatory requirements typically cover safety & environmental concerns. Some jurisdictions require what is called “RAGAGEP” RAGAGEP stands for.

Answer 1

Recognized and Generally Accepted Good Engineering Practice

Question 2

Which of the following codes is not a tank inspection code

Answer 2

API RP 12R1
API 653
STI SP001
UL-142 si

Question 3

A tank pad is installed with cinders. What chemical in the cinders can cause bottom-side corrosion when the pad gets wet

Answer 3

Sulfur

Question 4

Which of the following is not a common cause of bottom-side corrosion on a tank floor?

Answer 4

a. Clay or wood left in sand pad
b. faulty installation of sand pad
c. improperly sealed ring wall
d. leaking product that is corrosive
e. operating temp below 200 si
f. poor drainage in tank area

Question 5

In order to prevent bottom-side corrosion, which of the following is not recommended

Answer 5

Asphalt - Impregnated fiberboard on top of ring-wall

Question 6

What are the two common causes of severe external corrosion at the bottom of the lower shell course

Answer 6

1. Settlement so that soil contacts shell

2. CUI - water wicking

Question 7

Concentration cell corrosion may occur in the many niches of

Answer 7

Riveted Tanks

Question 8

Which document helps the inspector understand corrosion mechanisms

Answer 8

API 571

Question 9

Most tanks are made from which metallurgy(s)

Answer 9

Carbon Steel

Question 10

Which of the following is not a common cause of corrosion in a tank’s vapor space?

Answer 10

Nitrogen

Question 11

Generally, in the liquid portion of a tank, internal corrosion is worse at the

Answer 11

Bottom of the tank

Question 12

Which of the following tank products does not cause stress corrosion cracking

Answer 12

Benzene si
Caustic
DEA
Ethanol

Question 13

Occasionally a tank will be built with alloy materials. Which of the following is a common reason for selecting alloys to build a tank

Answer 13

Maintain Product Purity

Question 14

Stress corrosion cracking of austenitic SS can occur in the presence of

Answer 14

Chlorides

Question 15

Horizontal uninsulated cylindrical tanks can sometimes experience accelerated external corrosion on

Answer 15

Saddle-to-tank interface

Question 16

What type of tank failure has occurred in the past that results in a sudden and complete loss of the product

Answer 16

Brittle Failure

Question 17

Which tank weld is most likely to have a leak that is the result of a weld defect

Answer 17

Three Plate Laps

Question 18

Cracks are most likely to occur in which of the following welds

Answer 18

Bottom fillet welds
Bottom-to-shell welds si
Horizontal shell welds
Vertical shell welds

Question 19

In which of the following areas are cracks least likely to occur

Answer 19

Roof Fillet Welds
Around rivet holes
Bracket welds
Nozzle welds

Question 20

What weld is most susceptible to cracking in a hot tank

Answer 20

Bottom-to-shell welds

Question 21

A tank experiences excessive uniform tank settlement. Which area of the tank is most likely to be over-stressed

Answer 21

Nozzles

Question 22

Pressure-vacuum vents and flame arrestors can fail to operate for a variety of reasons. Which of the following is not a cause?

Answer 22

Product Specific Gravity is increased
deposits by birds or insects
corrosion between moving parts
fouled
ice in cold climates

Question 23

A plugged floating roof drain

Answer 23

Can cause the roof to sink

Question 24

The inspection checklists listed in API 653 Appendix C are:

Answer 24

considered a “memory jogger” for the inspector