This manual was prepared, by BAY Technical Associates, Inc

1.The first course of an aboveground storage tank is fabricated of 7/8 material, the tank has been in-service for 14 years. Current thickness measurements reveal the general condition of the shell plate to be corroded to an average thickness of .643. The calculated minimum required design thickness is .402. What is the remaining life expectancy of this tank based on the first course information?

a) Remaining life = 7.3 years

b) Remaining life = 9.3 years

c) Remaining life = 15 years

d) Remaining life = 18 years

Answer c): Reference API-575 Paragraph 6.2 and API-653 Paragraph 6.4.22.What is the maximum permissible weld reinforcement for a vertical joint in plate thickness 1.25?

a) 3/16th inch

b) 1/8th inch

c) 1/4th inch

d) 3/32nd inch

Answer: a) Reference: API-653 Paragraph 10.4.2.6 & API-650, Paragraph 5.2.1.5

3.A repair organization has a WPS, which states it is qualified for P-8 to P-8 material welded, with either E308, E309, or E316 electrodes (SMAW process). The PQR supporting this WPS states the weld test coupons were SA-240 Type 304L material, welded with E308 electrodes. Is the WPS properly qualified for the base material listed?

a) No SA-240 Type 304L is not P-8 Material

b) Yes - SA-240 Type 304L is P-8 Material

c) No E308 electrodes may not be used to weld SA-240 Type 304L material

d) Yes the WPS is qualified because the type of electrode is not an essential variable

Answer b): Reference ASME Section IX, QW-422

4.During the filling of a new aboveground storage tank for testing, leakage was observed in a horizontal seam. Repairs are to be completed with the test water in the tank. The tank is 61 feet high and the leak is discovered 29 feet below the top of the tank. Where must the water level be during the repair?

a) The water level shall be not more than 31 feet from the bottom of the tank

b) The water level shall be not more than 26 feet from the top of the tank

c) The water level shall be at the maximum design liquid level

d) The water shall be removed from the tank

Answer: a) Reference: API-650, Paragraph 5.4.4

5.An NPS 12 nozzle is to be installed in an existing 96 feet diameter AST. The shell course thickness is .625 and the reinforcement plate thickness is .75. What minimum size of nozzle-to-reinforcing plate fillet weld is required to comply with API-650?

a) .3125

b) .4375

c) .5625

d) .6250

Answer a): Reference: API-650 Figure 3-4B and Table 3-7 t=.75 and T=.625 (.3125

Closed Book

1.If soil movement raises the grade level to cover the lower portion of the shell, what would you as the inspector look for?

a) Severe external corrosion of the shell beneath the soil level onlyb) Severe external corrosion of the shell at, just above or below the grade linec) Severe internal corrosion of the shell beneath the soil level onlyd) Severe internal corrosion of the shell at, just above or below the grade lineAnswer: b) Reference: API-575, Paragraph 5.2.1

2.An inspector should be aware of the possibility of accumulation of dry pyrophoric deposits that could ignite during the inspection. What should be done with these deposits if they can not be removed prior to the inspection?

a) These deposits should be kept moist

b) These deposits should be kept dry

c) These deposits should be covered with foam

d) These deposits should be left alone and the inspector should stay at least 12 feet from them

Answer: a) Reference: API-575, Paragraph 7.4.2

3.What is the minimum overlap for ultrasonic thickness readings according to API-575?

a) 10 percent based on the thickness of the part being examined

b) 10 percent based on the diameter of the transducer

c) 10 percent based on the thickness of the calibration block

d) 10 percent based on the diameter of the transducer cable

Answer: b) Reference: API-575, Paragraph A.2

4. To ensure suitability for service, what is the minimum permitted frequency of tank foundation inspection?

a)Annually

b)Every five years

c)Monthly

d)PeriodicallyAnswer: c) API-653 Paragraphs 4.5.1.1 & 6.3.1.2

5.All tanks shall be given a visual external inspection, by an Authorized Inspector, at what frequency?

a)Inspection conducted at least every 20 years or at the quarter corrosion rate of the bottom whichever is less

b)Inspection conducted at least every 5 years or at the quarter corrosion rate of the bottom whichever is less

c)Inspection conducted at least every 5 years or at the quarter corrosion rate of the shell whichever is less

d)Inspection conducted at least every 20 years or at the quarter corrosion rate of the shell whichever is less

Answer: c) API-653 Paragraph 6.3.2.1

6.Heated tanks or tanks storing hot product can cause:

a)Increased water intrusion due to causing snow to melt and run down the tank sides

b)Excessive drying out of concrete foundations resulting in premature deterioration and failure

c)Accelerated corrosion on the internal surface especially in tanks with water bottoms

d)Accelerated corrosion on the external surface due to elevated temperature if the area is wet

Answer: d) API RP 651, Paragraph 5.4.1

7.The velocity in the material under test is a function of which of the following?

a) The physical properties of the material

b) The physical properties of the transducer

c) The skill of the UT technician

d) The atmospheric conditions at the time of the test

Answer a): Reference ASME Section V, SE-797 Paragraph 4.3

8. How does a welder maintain his or her qualification in a particular process?

a) A welder must perform Code welding in each process qualified at least every six months

b) A welder must weld in each process qualified at least every six months

c) A welder must perform Code welding in each process qualified at least every three months

d) A welder must weld in each process qualified at least every three months

Answer b): Reference ASME Section IX, QW-322

9. API Standard 653 defines the Critical Zone for repairs to tank bottoms as what?

a) That portion of the bottom or annular plate within 3" from the inside edge of the shell, measured radially inward

b) Within the annular plate ring, within 12 inches of the shell, or within 12 inches of the inside edge of the annular plate ring

c) That portion of the bottom or annular plate within 6" from the inside edge of the shell, measured radially inward

d) Within the annular plate ring, within 3" of the shell, or within 12 inches of the inside edge of the annular plate ring

Answer a) Reference API-653, Paragraph 9.10.1.2 and Paragraph 3.9

10.What is the requirement when protective coatings are used on surfaces to be welded?

a) The coating must be removed prior to welding

b) The coating shall be included in the welders performance qualification tests

c) The coating shall be included in the welding procedure qualification

d) The coating shall be identified on the purchase order

Answer: c) Reference: API-650, Paragraph 5.2.1.9

30'

61'

31'

Leakage at

29 feet from

top of tank

API-653 Exam Prep Course 2007BAY Technical Associates, Inc.(610) 594-9036