API 653 Exam Questions and
Answers 100% Pass
what is the minimum thickness for a tank floor plate with no means for leak detection
or secondary containment if an RBI program is not in place - ✔✔0.1 inch reference table
4.4 API 653
when a full hydrostatic test is required, it shall be held for - ✔✔24-hours reference 12.3.1
API 653
how many radiographs shall be taken in a square 2 in x 24 in but welded insert play in a
1-inch thick shell - ✔✔6 total one horizontal one vertical one in each corner : reference
12.2.1.6.2 API 653
what is the minimum number of radiographs that shall be taken on a circular but
welded insert plate in a shell 1/2 in thick - ✔✔one : reference 12.2.16 .1 API 653
how much time do you need to keep the radiographs of a reconstructed tank - ✔✔1
year reference 13.2.3 API 653
who should conduct visual inspection and review and NDE results? - ✔✔the authorized
inspector
EMILY CHARLENE © 2025, ALL RIGHTS RESERVED 1
, how much time should the operator keep the cathodic protection records - ✔✔5 years
minimum diagnostic length of a radiograph is - ✔✔6 inches
the total metal lost / the period of time over which the metal loss occurred is the -
✔✔corrosion rate
the presence of rock under the steel bottom of an AST would have what effect -
✔✔promote severe Underside corrosion
when do you use thin-film linings - ✔✔when the tank is new or has light corrosion
a formal visual external inspection by an authorized inspector shall be made - ✔✔at
least every five years or RCA / 4N years whichever is less
radiographic density shall be check by densitometer calibrated on a step wedge film
traceable to - ✔✔a National Standard
a welder deposits more metal than Allowed by the WPS what should be done - ✔✔re-
qualify the welder
what is the maximum critical length for plate thickness determination - ✔✔40 inches
when is it necessary for a hydrostatic test on a reconstructed tank - ✔✔always
between thin film and thick film Linings which lining is best for crude oil tank that
operates at 190 degrees F - ✔✔thin film
what is the maximum spacing for MT prods - ✔✔8 inches
EMILY CHARLENE © 2025, ALL RIGHTS RESERVED 2
Answers 100% Pass
what is the minimum thickness for a tank floor plate with no means for leak detection
or secondary containment if an RBI program is not in place - ✔✔0.1 inch reference table
4.4 API 653
when a full hydrostatic test is required, it shall be held for - ✔✔24-hours reference 12.3.1
API 653
how many radiographs shall be taken in a square 2 in x 24 in but welded insert play in a
1-inch thick shell - ✔✔6 total one horizontal one vertical one in each corner : reference
12.2.1.6.2 API 653
what is the minimum number of radiographs that shall be taken on a circular but
welded insert plate in a shell 1/2 in thick - ✔✔one : reference 12.2.16 .1 API 653
how much time do you need to keep the radiographs of a reconstructed tank - ✔✔1
year reference 13.2.3 API 653
who should conduct visual inspection and review and NDE results? - ✔✔the authorized
inspector
EMILY CHARLENE © 2025, ALL RIGHTS RESERVED 1
, how much time should the operator keep the cathodic protection records - ✔✔5 years
minimum diagnostic length of a radiograph is - ✔✔6 inches
the total metal lost / the period of time over which the metal loss occurred is the -
✔✔corrosion rate
the presence of rock under the steel bottom of an AST would have what effect -
✔✔promote severe Underside corrosion
when do you use thin-film linings - ✔✔when the tank is new or has light corrosion
a formal visual external inspection by an authorized inspector shall be made - ✔✔at
least every five years or RCA / 4N years whichever is less
radiographic density shall be check by densitometer calibrated on a step wedge film
traceable to - ✔✔a National Standard
a welder deposits more metal than Allowed by the WPS what should be done - ✔✔re-
qualify the welder
what is the maximum critical length for plate thickness determination - ✔✔40 inches
when is it necessary for a hydrostatic test on a reconstructed tank - ✔✔always
between thin film and thick film Linings which lining is best for crude oil tank that
operates at 190 degrees F - ✔✔thin film
what is the maximum spacing for MT prods - ✔✔8 inches
EMILY CHARLENE © 2025, ALL RIGHTS RESERVED 2
