API 653 EXAM QUESTIONS WITH
100% CORRECT ANSWERS
What are you looking for when you check the immediate area of an addition of a
reinforcing plate to an exisiting penetration? - Answer-UT examination of shell plate for
laminations (12.1.2.1)
For AST's what NDE technique shall be used to check completed welds attaching
nozzle neck to shell, and reinforcing plate to shell and to nozzle neck? - Answer-Mag
particle or liquid penetrant (12.1.2.3)
Unless a stress analysis is performed what is the minimum bottom plate thickness in the
critical zone of the tank bottom? - Answer-the smaller of one-half the original bottom
plate thickness or 50 % of tmin of the lower shell course, but not less than 0.1 in.
(4.4.5.4)
For AST's, NDT examinations shall be performed in accordance with which API
standards? - Answer-API 650 (12.1.1.1)
May welding be performed during the reconstruction of a tank if the temprature of the
base metal is less than 32F? - Answer-Yes, base metal 3" from start of weld should be
heated until is warm to the touch (140F) before welding. No welding below 0F (10.4.2.3)
On a reconstructed tank, according to API 653, reinforcement of new welds on all butt
joints on each side of the plate shall not exceed the following, for plate thickness < 1/2",
the maximum reinforcement thickness for 'vertical' joint is what? - Answer-3/32" (Table
10.1)
During reconstruction of a tank shell with plate thickness 5/8" or less, misalignment in
completed vertical joints shall not exceed what dimension? - Answer-1/16" (10.4.4.1)
A reconstructed tank with a height of 36ft and a diameter of 100ft is checked for out of
plumness. What is the calculated max out of plumbness? - Answer-(36*12)/100 = 4.32".
No greater than 5". (10.5.2.1)
For AST's, welding procedure specifications (WPS) and welders and welding operators
shall be qualified in accordance with what ASME standard? - Answer-ASME Section IX
(11.1.1)
The welder of welding operator's identifications mark shall be hand or machine-stamped
along the completed welds on reconstructed tanks. What is the interval spacing in feet?
- Answer-3ft (11.2.2)
, An inspector is responsible for inspecting a new shell plate that is joined to another new
shell plate. What inspection method(s) is/are required by API 653? - Answer-
Radiography (12.1.5.2)
Upon completion of a welding on a tank bottom, the plates and the entire lenght of new
welds for tank bottom plates shall be examined by what NDE technique to check for any
potential defects and leaks? - Answer-Visually (12.1.7.1)
Repaired vertical joints in existing shell plates shall have how many additional
radiographs taken at each joint? - Answer-One aditional at each joint( 12.2.1.1.2)
What is the minimum number of radiographs required, when a new or replacement
circular insert plate is butt welded to the shell? - Answer-A minimum of 1 radiograph
(12.2.1.6.1)
If you see a "R" on a radiograph and radiograph records of repaired welds, what does
the "R" signify? - Answer-Whats the question? (12.2.3.2)
When a reconstructed tank and any tank that has undergone major repairs or major
alterations, it shall have a full hydrostatic test. How long is that hydrostatic test held
(hrs)? - Answer-24hrs (12.3.1)
What steps and documentation is required by API 653 in order to exempt a major repair
or alteration of a tank from hydrostatic testing? - Answer-Engineer and owner/operator
must authorize in writting (12.3.2.2)
When tanks are recosntructed in accordence with API 653, what attachment is required
to be attaced to the tank? - Answer-A corrosion resistant metal nameplate with
reconstructed data (13.1.1.1)
When should a monitoring program to determine the effects of settlement on storage
tanks be initiated? - Answer-At onstruction and continued during hydrostatic testing and
operation (B1.1)
What steps should be taken if at any time the settlement of a tank is deemed to be
excessive? - Answer-Empty and re-level (B1.2)
When taking tank settlement readings internally accross the bottom of a tank (tank is
OOS), what is the maximum spacing of the points along the tank diameter? - Answer-
32ft spacing (Fig B.2)
What type of settlement (more than all the others) should be evaluated to ensure the
structural integrity of the shell and bottom of the tank? - Answer-Out of plane settlement
(B2.2.4)
100% CORRECT ANSWERS
What are you looking for when you check the immediate area of an addition of a
reinforcing plate to an exisiting penetration? - Answer-UT examination of shell plate for
laminations (12.1.2.1)
For AST's what NDE technique shall be used to check completed welds attaching
nozzle neck to shell, and reinforcing plate to shell and to nozzle neck? - Answer-Mag
particle or liquid penetrant (12.1.2.3)
Unless a stress analysis is performed what is the minimum bottom plate thickness in the
critical zone of the tank bottom? - Answer-the smaller of one-half the original bottom
plate thickness or 50 % of tmin of the lower shell course, but not less than 0.1 in.
(4.4.5.4)
For AST's, NDT examinations shall be performed in accordance with which API
standards? - Answer-API 650 (12.1.1.1)
May welding be performed during the reconstruction of a tank if the temprature of the
base metal is less than 32F? - Answer-Yes, base metal 3" from start of weld should be
heated until is warm to the touch (140F) before welding. No welding below 0F (10.4.2.3)
On a reconstructed tank, according to API 653, reinforcement of new welds on all butt
joints on each side of the plate shall not exceed the following, for plate thickness < 1/2",
the maximum reinforcement thickness for 'vertical' joint is what? - Answer-3/32" (Table
10.1)
During reconstruction of a tank shell with plate thickness 5/8" or less, misalignment in
completed vertical joints shall not exceed what dimension? - Answer-1/16" (10.4.4.1)
A reconstructed tank with a height of 36ft and a diameter of 100ft is checked for out of
plumness. What is the calculated max out of plumbness? - Answer-(36*12)/100 = 4.32".
No greater than 5". (10.5.2.1)
For AST's, welding procedure specifications (WPS) and welders and welding operators
shall be qualified in accordance with what ASME standard? - Answer-ASME Section IX
(11.1.1)
The welder of welding operator's identifications mark shall be hand or machine-stamped
along the completed welds on reconstructed tanks. What is the interval spacing in feet?
- Answer-3ft (11.2.2)
, An inspector is responsible for inspecting a new shell plate that is joined to another new
shell plate. What inspection method(s) is/are required by API 653? - Answer-
Radiography (12.1.5.2)
Upon completion of a welding on a tank bottom, the plates and the entire lenght of new
welds for tank bottom plates shall be examined by what NDE technique to check for any
potential defects and leaks? - Answer-Visually (12.1.7.1)
Repaired vertical joints in existing shell plates shall have how many additional
radiographs taken at each joint? - Answer-One aditional at each joint( 12.2.1.1.2)
What is the minimum number of radiographs required, when a new or replacement
circular insert plate is butt welded to the shell? - Answer-A minimum of 1 radiograph
(12.2.1.6.1)
If you see a "R" on a radiograph and radiograph records of repaired welds, what does
the "R" signify? - Answer-Whats the question? (12.2.3.2)
When a reconstructed tank and any tank that has undergone major repairs or major
alterations, it shall have a full hydrostatic test. How long is that hydrostatic test held
(hrs)? - Answer-24hrs (12.3.1)
What steps and documentation is required by API 653 in order to exempt a major repair
or alteration of a tank from hydrostatic testing? - Answer-Engineer and owner/operator
must authorize in writting (12.3.2.2)
When tanks are recosntructed in accordence with API 653, what attachment is required
to be attaced to the tank? - Answer-A corrosion resistant metal nameplate with
reconstructed data (13.1.1.1)
When should a monitoring program to determine the effects of settlement on storage
tanks be initiated? - Answer-At onstruction and continued during hydrostatic testing and
operation (B1.1)
What steps should be taken if at any time the settlement of a tank is deemed to be
excessive? - Answer-Empty and re-level (B1.2)
When taking tank settlement readings internally accross the bottom of a tank (tank is
OOS), what is the maximum spacing of the points along the tank diameter? - Answer-
32ft spacing (Fig B.2)
What type of settlement (more than all the others) should be evaluated to ensure the
structural integrity of the shell and bottom of the tank? - Answer-Out of plane settlement
(B2.2.4)
