API 653 2025 OPEN BOOK EXAM2
A 10" nozzle is to be hot tapped into the first course of an in-service above ground
storage tank constructed with material of recognized toughness. What must the
minimum shell thickness be in order to install this nozzle?
a. 3/16"
b. 1/4"
c. 5/16"
d. 1/2" - answerc. 5/16"
A peripheral seal of an internal floating roof shall be designed to accommodate __
inches of local deviation between the floating roof and the shell.
a.+. 1
b. +_2
C.+_ 3
d.+_4 - answerd.+_4
A new above ground storage tank has its bottom and second course plates constructed
of ASTM A516 Gr 60 steel that is thicker than 1 inch. How much of the vertical shell
welds must be radiographed?
a. Vertical spot radiographs are required in each vertical seam in the lowest course.
b. Spot radiographs of the bottom of each vertical seam in the lowest shell course are
required.
c. Vertical spot radiographs are required in the first 10 feet and one in each 100 feet
thereafter. d.Complete radiography of each vertical seam is required.
d. Complete radiography of each vertical seam is required. - answerd. Complete
radiography of each vertical seam is required.
4. When visually examining a weld of an aboveground storage tank, the frequency of
surface porosity in the weld must not exceed one cluster (one or more pores) in any __
inches of length and the diameter of each cluster must not exceed 3/32 inch.
a.2
b.3
c.4
d.5 - answerc.4
4. Which of the following is not included on the API 653 reconstruction nameplate?
a. Specific Gravity.
b. Minimum operating temperature.
c. Maximum operating liquid level.
d. Shell material for each shell course. - answerc. Maximum operating liquid level.
, 4. An aboveground storage tank is constructed of ASTM A-516 Grade 55 plate. The
tank is dismantled, deseamed and reconstructed at another site. The tank was originally
butt weld constructed to API 650, 1988 edition. The specific gravity of the product to be
stored in the tank is 0.85. The maximum operating temperature in the new service is
120 degrees F. The minimum operating temperature is 65 degrees F. The tank diameter
is 75 feet and its operating height is 40 feet. Determine the minimum thickness required
in the bottom course for a hydrostatic test.
a.0.338"
b. 0.380".
c.0.287"
d.0.410" - answerc. 0.287"
7. A 75' diameter by 40' high storage tank has a thin area in the bottom shell course 1
foot above the floor of the tank. The specific gravity of the liquid stored in the tank is
0.80. The temperature of the product in the tank is 200 degrees F. The minimum
thickness measured in the thin area is 0.30". Determine the critical length in the
corroded area.
a. 60.8"
b. 40.0"
C. 17.55"
d.4.74 - answerC. 17.55"
When changing the operating temperature of an atmospheric storage tank to above 200
degrees F., all the requirements of :
a. API Standard 653, Appendix D shall be considered.
b. API Standard 650, Appendix F shall be considered.
c. API Standard 650, Appendix M shall be considered.
d. API Standard 620, Appendix E shall be considered. - answerc. API Standard 650,
Appendix M shall be considered.
For tanks greater than 200 feet in diameter, the design method to be used is known as:
a. the 1-foot method.
b. the variable design point method.
c. the elastic meridian design method.
d. the average hoop stress design method. - answerb. the variable design point method.
The joint efficiency of a riveted lap joint with one rivet row is:
a. 0.75
b. 0.70
C. 0.60
d. 0.45 - answerd. 0.45
A 10" nozzle is to be hot tapped into the first course of an in-service above ground
storage tank constructed with material of recognized toughness. What must the
minimum shell thickness be in order to install this nozzle?
a. 3/16"
b. 1/4"
c. 5/16"
d. 1/2" - answerc. 5/16"
A peripheral seal of an internal floating roof shall be designed to accommodate __
inches of local deviation between the floating roof and the shell.
a.+. 1
b. +_2
C.+_ 3
d.+_4 - answerd.+_4
A new above ground storage tank has its bottom and second course plates constructed
of ASTM A516 Gr 60 steel that is thicker than 1 inch. How much of the vertical shell
welds must be radiographed?
a. Vertical spot radiographs are required in each vertical seam in the lowest course.
b. Spot radiographs of the bottom of each vertical seam in the lowest shell course are
required.
c. Vertical spot radiographs are required in the first 10 feet and one in each 100 feet
thereafter. d.Complete radiography of each vertical seam is required.
d. Complete radiography of each vertical seam is required. - answerd. Complete
radiography of each vertical seam is required.
4. When visually examining a weld of an aboveground storage tank, the frequency of
surface porosity in the weld must not exceed one cluster (one or more pores) in any __
inches of length and the diameter of each cluster must not exceed 3/32 inch.
a.2
b.3
c.4
d.5 - answerc.4
4. Which of the following is not included on the API 653 reconstruction nameplate?
a. Specific Gravity.
b. Minimum operating temperature.
c. Maximum operating liquid level.
d. Shell material for each shell course. - answerc. Maximum operating liquid level.
, 4. An aboveground storage tank is constructed of ASTM A-516 Grade 55 plate. The
tank is dismantled, deseamed and reconstructed at another site. The tank was originally
butt weld constructed to API 650, 1988 edition. The specific gravity of the product to be
stored in the tank is 0.85. The maximum operating temperature in the new service is
120 degrees F. The minimum operating temperature is 65 degrees F. The tank diameter
is 75 feet and its operating height is 40 feet. Determine the minimum thickness required
in the bottom course for a hydrostatic test.
a.0.338"
b. 0.380".
c.0.287"
d.0.410" - answerc. 0.287"
7. A 75' diameter by 40' high storage tank has a thin area in the bottom shell course 1
foot above the floor of the tank. The specific gravity of the liquid stored in the tank is
0.80. The temperature of the product in the tank is 200 degrees F. The minimum
thickness measured in the thin area is 0.30". Determine the critical length in the
corroded area.
a. 60.8"
b. 40.0"
C. 17.55"
d.4.74 - answerC. 17.55"
When changing the operating temperature of an atmospheric storage tank to above 200
degrees F., all the requirements of :
a. API Standard 653, Appendix D shall be considered.
b. API Standard 650, Appendix F shall be considered.
c. API Standard 650, Appendix M shall be considered.
d. API Standard 620, Appendix E shall be considered. - answerc. API Standard 650,
Appendix M shall be considered.
For tanks greater than 200 feet in diameter, the design method to be used is known as:
a. the 1-foot method.
b. the variable design point method.
c. the elastic meridian design method.
d. the average hoop stress design method. - answerb. the variable design point method.
The joint efficiency of a riveted lap joint with one rivet row is:
a. 0.75
b. 0.70
C. 0.60
d. 0.45 - answerd. 0.45
