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1/07 ITAC API 653 Exam Prep Homework #4 Questions Page 1

Study SheetsBased on API 653 Exam Information

The following is a collection of questions remembered by various students who took the API 653Exam in the past.

This study sheet is designed to help a student prepare for the API 653 Exam. Read eachquestion carefully and select the best answer by circling your choice. After selection of youranswer, write in the section number and publication in which your answer was found. Look up eachquestion in the reference publications listed below; remember, this exercise is to help you to learnto use the reference material. Generally, the assignment is broken into several sections. Eachsection should take approximately one hour to complete. Answers will be discussed at thebeginning of class the following morning.

The answers will be found in the following reference publications:

API 571 , Damage Mechanisms Affecting Fixed Equipment in the Refining Industry , First Edition, December, 2003

ATTENTION: Only the following mechanisms are included in the exam:

Par. 4.2.7 – Brittle FracturePar. 4.2.16 – Mechanical FatiguePar. 4.3.2 – Atmospheric CorrosionPar. 4.3.3 – Corrosion Under Insulation (CUI)Par. 4.3.8 – Microbiologically Induced Corrosion (MIC)Par. 4.3.9 – Soil CorrosionPar. 4.3.10 – Caustic CorrosionPar. 4.5.1 – Chloride Stress Corrosion Cracking (Cl-SCC)Par. 4.5.3 – Caustic Stress Corrosion Cracking (Caustic Embrittlement)Par. 5.1.1.11 – Sulfuric Acid Corrosion

API RP 575 , Guidelines and Methods for Inspection of Existing Atmospheric and Low- pressure Storage Tanks , Second Edition, May, 2005

API RP 577 , Welding Inspection and Metallurgy , First Edition, October, 2004

API 650 , Welded Steel Tanks for Oil Storage , Tenth Edition, November, 1998, including Addendum 1 (March, 2000), Addendum 2 (November, 2001), Addendum 3 (September, 2003) and Addendum 4 (December, 2005).

API RP 651 , Cathodic Protection of Aboveground Petroleum Storage Tanks , Third Edition, January, 2007

API RP 652 , Lining of Above Ground Petroleum Storage Tank Bottoms , Third Edition, October, 2005

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III TTT AAA CCC

API 653 , Tank Inspection, Repair, Alteration and Reconstruction , Third Edition, December, 2001, including Addendum 1 (September, 2003) and Addendum 2 (November, 2005).

ASME Boiler & Pressure Vessel Code , 2004 Edition, with 2005 and 2006 Addenda

Section V , Nondestructive Examination , Articles 1, 2, 6, 7 and 23 (Section SE-797 only)

Section IX , Welding and Brazing Qualifications

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76. What is the P number for the tank as listed above?

a. 1.5b. 1c. 6d. 24

Section: Reference Publication:

77. If studs were installed on this tank, what polarity would have been used for the “stud gun”?

a. DCENb. DCEPc. A Cd. No polarity


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III TTT AAA CCC78. What is the SFA number for E 7018 electrodes?

a. 5b 5.1

c. 5.29d. 5.42


79. What is the filler number for E-7018 electrodes?

a. 1b. 2c. 3d. 4


80. What is the minimum acceptable shell plate thickness for the first course of T 3-27, if thespecific gravity of the stored product is 1.3? NOTE: current inspection (2003) based onproduct alone, and full height operation.

a. .316”b. .500”c. .262”d. Not enough information given


81. What is the hydrostatic test height of T 3-27 if the joint efficiency is .85 and the specificgravity of the product is 1.3?

a. 56.88'b. 40'c. 28.27'd. Not enough information given


82. What is the minimum acceptable shell plate thickness for the top course of T 3-27 if eachcourse is 120" tall?

a. .1"b. .062"c. .269"d. Not enough information given


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III TTT AAA CCC83. What is the joint efficiency for T 3-27?

a. 1

b. .85c. .70d. .35


84. What is the corrosion allowance for T 3-27?



85. If T 3-27 was new, what would be the minimum first course thickness, based on productalone?



86. How many settlement points are required for an external settlement of T 3-27?

a. 4b. 6c. 8d. 10


87. A depression in the floor is discovered near the east manway of T 3-27. The diameter ofthe depression is 96", the deepest point in the depression is 4". The area _________.

a. is rejectable.b. is acceptable.c. must be monitored.d. can be filled in with epoxy and accepted.


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III TTT AAA CCC88. During the internal inspection of T 3-27, a patch plate welded to the floor, with a tombstone

shaped pad, extending to the inside of the shell was discovered. The plate had beenseal welded to the floor and shell, with a minimum dimension of 12 inches. The inspectorshould _____________.

a. have the patch removed.b . inspect the patch.c. recommend removal of the patch and floor plates in the repaired area, replacing with

new floor plates.d. this repair is in the critical zone and not allowed.


89. During the same internal inspection of T 3-27, a square lap-welded patch was found overan existing nozzle. The inspector should __________.

a. have the patch removed.b . inspect the patch.c. cut out the entire shell plate.d. radiograph the patch for weld quality.


90. T 3-27 has a hole, less than 1" in diameter, in the roof. Rain water does not contaminate thestored product. Is a repair required by API 653?

a. A repair may be made by using duct tape.b. Only if the owner requires the repair.c. Nod. Yes


91. What is the position designation for welding pipe in the horizontal fixed position?

a. 2Gb. 3Gc. 5G

d. 6GSection: Reference Publication:

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III TTT AAA CCC92. What is the minimum remaining thickness of a floor using the following conditions.

0 r = 10 years S tP r = 0 (the inside has been coated)

RT bc = .200” UP r = .007RT ip = .190”

a. .200”b. .190”c. .120”d. .100”


93. Terminology for weld metal in excess of the specified weld size.

a. Weld reinforcementb . Good weld techniquec. Weld toed. Weld throat


94. If T 3-27 had a new nozzle installed in the third course, north side, could the shell-to-nozzleweld be made using the oxyfuel welding process, if impact testing is not required?

a. Yesb. Noc. The oxyfuel process is not allowed by ASME Section IXd. Nozzle welds must be made using SMAW only


95. A circular insert replacement plate was installed on an existing tank. How many radiographsare required if the shell is 5/8” thick where the plate is installed?

a. 1b. 4c. None, if the thickness is less than 1 inch

d. NoneSection: Reference Publication:

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III TTT AAA CCC96. The minimum lbf/in 2 for a vacuum box test is a partial vacuum of ____ gauge.

a. 1 lbf /in 2b. 2 lbf /in 2

c. 3 lbf /in2

d. 4 lbf /in 2


97. A pipe welder is qualified to API 1104 only. What welds can he make on the tank if heis qualified in the 6G position?

a. Nozzle Weldsb. Shell Weldsc. Floor and roof fillet weldsd. None


98. A procedure is qualified on plate .500" thick. Which of the following thicknesses is notqualified?

a. 1"b. 1/2"c. 1/4"d. 1/8"


99. A procedure is qualified on plate .500" thick. Four nick break specimens were substitutedfor the four side bends.

a. The procedure is qualified.b. ASME does not allow nick breaks.c. Two tension specimens were required.d. Nick breaks are used only on pipe.


100. A welder is qualified in the 3F and 4F positions. Which of the following groove welds canhe make?

a. 1Gb. 2Gc. 6Gd. None


653 homework #4

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