Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
A series of multiple-choice questions and answers related to api 653 certification. It covers various aspects of tank inspection, repair, and construction, including weld procedures, corrosion assessment, and material selection. The questions are designed to test knowledge and understanding of api 653 standards and practices.
Typology: Exams
1 / 35
This page cannot be seen from the preview
Don't miss anything!
An insert plate is required for a new 4 NPS nozzle (4.5" O.D.) in the shell. What is the minimum diameter for this insert?
A welder is qualified on a plate in the 3G position. The welder is qualified for what fillet weld position(s)?
A. None
B. F, H
C. F, H, V
D. All fillets ✔✔C. F, H, V
When must a shim be placed under an Image Quality Indicator?
A. When the area of interest is darker.
B. When the area of interest is darker by more than 15%.
C. When the area of interest is lighter
D. When the area of interest is lighter by more than 15%. ✔✔D. When the area of interest is
lighter by more than 15%.
A welder passes a qualification test using a 3 NPS pipe with a groove weld. What is the maximum pipe diameter that the welder is now qualified to weld?
D. Unlimited ✔✔D. Unlimited
A portion of a 1/2" thick shell plate is replaced. What is the closest distance allowed between this plate and the adjacent vertical weld?
Tank Number: T-
Diameter: 114'
Specific Gravity: 0.
Plate Material: A-283 gr C
Shell Corrosion Rate: 0.003"/yr
Allowable Liquid Height: 40'
Construction Code: API 650 4th Edition
A corroded area is found 3' from the bottom and 4" from the nearest weld. The lowest reading in the locally corroded area is 0.368".
What is the required thickness "tmin" in this corroded area?
Tank Number: T-
Diameter: 114'
Specific Gravity: 0.
Plate Material: A-283 gr C
Shell Corrosion Rate: 0.003"/yr
Allowable Liquid Height: 40'
Construction Code: API 650 4th Edition
A corroded area is found 3' from the bottom and 4" from the nearest weld. The lowest reading in the locally corroded area is 0.368".
API 653 sets a limit on the thickness of "t2". In order to provide a 10 year run, what is the minimum thickness that "t2" can be during this inspection?
A flush patch (patch with butt welds) is installed in a shell plate that is 1" thick. What is the closest distance allowed between this piece and the existing horizontal weld?
Joe Welder qualified using a 4G coupon that is 0.625" thick. The qualification weld was made with 4 layers. What is the maximum weld metal thickness that Joe is now qualified to weld?
D. Unlimited ✔✔D. Unlimited
A reconstruction tank has a tank height of 50 feet. During reconstruction, what is the maximum acceptable out-of-plumbness?
A. 0.25 inches
B. 3.0 inches
C. 5.0 inches
D. 6.0 inches ✔✔C. 5.0 inches
When evaluating a radio-graph of a 1" thick weld, the Geometric Unsharpness should not exceed:
The original floor thickness was 0.250". The minimum thickness before repairs was 0.120" and the minimum floor thickness after repairs was 0.180".
The bottom-side has a maximum corrosion rate of 0.002 ipy. The top-side had a maximum corrosion rate of 0.003 ipy. A new reinforced lining (0.060" thick) was just installed on the tank floor. The next inspection interval is 20 years.
The radiographer is RT'ing a small tank's horizontal weld. The examiner places the source in the center of the tank and wraps 15 RT films completely around this tank weld. What is the minimum number of IQI's that can be used?
A riveted tank has shell plates that butt up to each other with butt straps on both sides of the shell. There are a total of 6 rows of rivets *********** strap. What joint efficiency is used when determining the minimum thickness for the shell?
A tank shell plate has a deep pit. The shell plate away from the pit is 0.500" and has a corrosion allowance of 0.100" (t-min = 0.400"). What is the maximum pit depth allowed?
Densitometers that are used to measure film density must be calibrated to:
A. company standards.
B. jurisdictional standards.
C. ASTM E-114-
D. a calibrated step wedge film. ✔✔D. a calibrated step wedge film.
When qualifying a weld procedure using the SMA W process, which variable is considered an essential variable?
A. Groove design
B. Weld position
C. Shielding gas composition
D. Filler rod "F-number" ✔✔D. Filler rod "F-number"
A replacement tank bottom uses 3/8" plates that will be fillet-welded. What is the minimum size of fillet weld allowed for these tank bottom welds?
When radiographing a flat plate, location markers should be placed:
A. on the source side.
B. on the film side.
C. on either side.
D. every 6". ✔✔A. on the source side.
A shell course that is 3/8" thick is being replaced. The plates must be rolled to the curvature of the tank when the tank diameter is:
A. ≤ 40 ft
B. ≤ 60 ft
C. ≤ 80 ft
D. Shaping is required on all diameters. ✔✔B. ≤ 60 ft
A groove-weld procedure is being qualified. If the test coupon is 1/4" thick, what bend tests are required?
A. 2 root bends and 2 face bends
B. 4 side bends
C. 2 root bends and 2 face bends, or 4 side bends
D. 1 root bend and 1 face bend
E. 1 root bends and 1 face bend, or 2 side bends ✔✔A. 2 root bends and 2 face bends
A nozzle is hot tapped onto a tank. This nozzle should be:
A. a minimum of 12" long.
B. installed 6' from the nearest nozzle.
C. made with extra strong pipe.
D. made using a Class 300 flange. ✔✔C. made with extra strong pipe.
A welder is being qualified by radiography on a 0.750" plate using the SMA W process. What is the maximum length permitted for an elongated slag inclusion?
A. None allowed
B. 0.125"
C. 0.250"
D. 0.333"
E. 0.750" ✔✔C. 0.250"
ASME Section VIII had few limitations concerning Brittle Fracture prior to:
Determine the minimum allowed thickness in the critical zone of a bottom plate. The bottom shell course was originally 0.400" and has a t-min of 0.360". The tank floor was originally 0.250" thick.
An existing 160' weld tank has an annular plate ring. The tank was built to API 650 4th Edition and has product specific gravity of 0.85. Determine the minimum allowed thickness for the annular plate. The bottom shell course is 7/8" thick and has a stress level of 29,000 psi.
A hot tap is performed on a tank with an overall liquid height of 38'. The nozzle is installed 4' above the bottom. The product specific gravity is 0.80. Prior to cutting the shell, the nozzle should be pressure tested. Determine the pressure for this test. (Density of water is 0.0361 lb/in³)
A. 17.7 psig
B. 19.8 psig
C. 22.1 psig
D. 24.7 psig ✔✔C. 22.1 psig
Determine the maximum edge settlement allowed in a 120' tank. The settlement is perpendicular to the bottom plate welds and "breaks" 4' from the shell.
