Section 5 – Reasons to Inspect Flashcards
Regulatory requirements typically cover safety & environmental concerns. Some jurisdictions require what is called “RAGAGEP”. RAGAGEP stands for:
A. Recognized And Generally Accepted Good Engineering Practice.
B. Rules And Guidelines Adopted by Governmental Enhanced Politics.
C. Requirements Accepted, Governed, Adopted by Geographic Engineering Professionals.
D. Run And Gun As Guided by Exceptional Performance.
A (5.1.4.1)
Which of the following codes is not a tank inspection code? (Open Book)
A. API RP 12R1
B. API 653
C. STI SP001
D. UL-142
D (5.1.4.3)
A tank pad is installed with cinders. What chemical in the cinders can cause bottom-side corrosion when the pad gets wet?
A. Chlorides
B. Iron
C. Kryptonite
D. Silicon
E. Sulfur
E (5.2.2.2)
Which is not a common cause of bottom-side corrosion on a tank floor?
A. Clay or wood left in sand pad
B. Improperly sealed ring wall
C. Leaking product that is corrosive
D. Operating temperatures below 200 oF
E. Poor drainage in tank area
D (5.2.2.2)
A few clay balls are in a tank’s sand pad. Which of the following is true about bottom-side corrosion?
A. Corrosion will occur near the clay ball
B. Corrosion will occur under the clay ball
C. The clay ball forms a tight seal and prevents corrosion
D. Adjacent clay balls form a galvanic cell
B (5.2.2.2)
In order to prevent future bottom-side corrosion, which is not recommended during the construction of a tank?
A. Asphalt-impregnated fiberboard between ring-wall and tank bottom
B. During pad installation, assure pad materials are clean and salt free
C. Install sand pad using specified ASTM materials that is 3-4” thick
D. Install tank foundation 12” above the tank dike grade
A (5.2.2.2)
Which of the following often causes external corrosion at the bottom of the lower shell course? This may have more than one correct answer, select all answers that apply.
A. CUI
B. Shell covered with crude that leaked when tank was overfilled
C. Tank that has settled and the tank grade is higher than the tank bottom
D. Tank that has experienced cracks in the tank’s ring-wall
AC (5.2.2.2/3)
Concentration cell corrosion may occur in the many niches of:
A. cone roof tanks.
B. internal floating roof tanks.
C. low-pressure tanks.
D. riveted tanks.
D (5.2.2.4)
Which document helps the inspector understand corrosion mechanisms?
A. API 571
B. ASME PCC-2
C. ASTM SA-333
D. NACE 1089
A (5.2.3.1)
Most tanks storing petroleum product are made from which metallurgy(s)?
A. Carbon steel
B. Chromes
C. Carbon steel or chromes
D. Kryptonite
E. Austenitic stainless stee
A (5.2.3.2)
Which of the following tank products does not cause stress corrosion cracking? (Open Book)
A. Benzene
B. Caustic
C. DEA
D. Ethanol
A (5.2.3.2)
Which of the following is a common cause of corrosion in a tank’s vapor space? This may have more than one correct answer, select all answers that apply.
A. Hydrogen sulfide vapor
B. Oxygen
C. Nitrogen
D. Water vapor
ABD (5.2.3.2)
Generally, in the liquid portion of a tank, internal corrosion is worse at the:
A. bottom of the tank.
B. heat affect zones in shell horizontal welds.
C. nozzles.
D. welds.
A (5.2.3.2)
Occasionally a tank will be built with alloy materials. Which of the following is a common reason for selecting alloys to build a tank?
A. High design temperature
B. Increased strength
C. Lower cost
D. Maintain product purity
D (5.3.4)
Stress corrosion cracking of austenitic SS can occur in the presence of:
A. acids.
B. chlorides.
C. hydrocarbons.
D. sulfides
B (5.3.4)
Horizontal uninsulated cylindrical tanks can sometimes experience accelerated external corrosion on:
A. heads.
B. longitudinal welds.
C. nozzles.
D. saddle-to-tank interface.
D (5.3.5)
What type of tank failure has occurred in the past that results in a sudden and complete loss of the product?
A. Brittle failure
B. Failure at deep pitting
C. Failure at a localized thin area
D. Thermal fatigue
A (5.4.2)
Which tank weld is most likely to have a leak that is the result of a weld defect?
A. Annular plate butt welds
B. Bottom fillet welds
C. Horizontal shell welds
D. Three-plate lap welds
D (5.4.3)
Cracks are most likely to occur in which of the following welds?
A. Bottom fillet welds
B. Bottom-to-shell weld
C. Horizontal shell welds
D. Vertical shell welds
B (5.4.4)
In which of the following areas are cracks least likely to occur?
A. Around rivet holes
B. Bracket welds
C. Nozzle welds
D. Roof fillet welds
D (5.4.4)
What weld is most susceptible to cracking in a hot tank?
A. Bottom fillet welds
B. Bottom-to-shell weld
C. Horizontal shell weld
D. Roof-to-shell weld
B (5.4.4)
A tank experiences excessive uniform tank settlement. Which area of the tank is most likely to be over-stressed?
A. Nozzles
B. Horizontal shell weld
C. Roof-to-shell weld
D. Vertical shell weld
A (5.4.6)
Pressure-vacuum vents and flame arrestors can fail to operate for a variety of reasons. Which of the following is not a typical cause?
A. Deposits by birds or insects (poop, mud, etc.)
B. Corrosion between moving parts
C. Fouled
D. Ice in cold climates
E. Tank product is changed to a product with a lower vapor pressure
E (5.5.1)
A plugged floating roof drain:
A. can cause the roof to sink.
B. can cause excessive tank settlement.
C. will significantly increase the stress in the shell.
D. will increase the water in the bottom of the tank.
A (5.5.2)
