Section 5 - Reasons to Inspect Flashcards
Regulatory requirements typically cover safety & environmental concerns. Some jurisdictions require what is called “RAGAGEP” RAGAGEP stands for.
Recognized and Generally Accepted Good Engineering Practice
Which of the following codes is not a tank inspection code
API RP 12R1
API 653
STI SP001
UL-142 si
A tank pad is installed with cinders. What chemical in the cinders can cause bottom-side corrosion when the pad gets wet
Sulfur
Which of the following is not a common cause of bottom-side corrosion on a tank floor?
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
In order to prevent bottom-side corrosion, which of the following is not recommended
Asphalt - Impregnated fiberboard on top of ring-wall
What are the two common causes of severe external corrosion at the bottom of the lower shell course
- Settlement so that soil contacts shell
2. CUI - water wicking
Concentration cell corrosion may occur in the many niches of
Riveted Tanks
Which document helps the inspector understand corrosion mechanisms
API 571
Most tanks are made from which metallurgy(s)
Carbon Steel
Which of the following is not a common cause of corrosion in a tank’s vapor space?
Nitrogen
Generally, in the liquid portion of a tank, internal corrosion is worse at the
Bottom of the tank
Which of the following tank products does not cause stress corrosion cracking
Benzene si
Caustic
DEA
Ethanol
Occasionally a tank will be built with alloy materials. Which of the following is a common reason for selecting alloys to build a tank
Maintain Product Purity
Stress corrosion cracking of austenitic SS can occur in the presence of
Chlorides
Horizontal uninsulated cylindrical tanks can sometimes experience accelerated external corrosion on
Saddle-to-tank interface
What type of tank failure has occurred in the past that results in a sudden and complete loss of the product
Brittle Failure
Which tank weld is most likely to have a leak that is the result of a weld defect
Three Plate Laps
Cracks are most likely to occur in which of the following welds
Bottom fillet welds
Bottom-to-shell welds si
Horizontal shell welds
Vertical shell welds
In which of the following areas are cracks least likely to occur
Roof Fillet Welds
Around rivet holes
Bracket welds
Nozzle welds
What weld is most susceptible to cracking in a hot tank
Bottom-to-shell welds
A tank experiences excessive uniform tank settlement. Which area of the tank is most likely to be over-stressed
Nozzles
Pressure-vacuum vents and flame arrestors can fail to operate for a variety of reasons. Which of the following is not a cause?
Product Specific Gravity is increased deposits by birds or insects corrosion between moving parts fouled ice in cold climates
A plugged floating roof drain
Can cause the roof to sink
The inspection checklists listed in API 653 Appendix C are:
considered a “memory jogger” for the inspector
