API 653 EXAM QUESTIONS AND
THEIR CORRECT SOLUTIONS
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
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
, what is the height of the lead symbol B that shall be
attached to the back of each film holder during each
exposure to determine if Backscatter radiation is
exposing the film
1/2 inch
any work on a tank that changes its physical
dimensions or configuration is called an
alteration
which Annex of API 653 provides guides about above
ground storage tanks inspector certification
Annex D
the maximum permissible limit of exposure to organic
lead in a normal 8 hour work day is
2 micrograms of organic lead per cubic feet
the full course width for shell plate as per API 650
shall be a minimum of
72 in
in accordance with API standard 653, critical zone for
repairs to a tank bottom is that portion, which is
measured radially inward within 3 inches of the Inside
Edge of the shell
as per API standard 653 a routine in-service visual
external inspection of an above ground storage tank
shall be done every
one month
how many types of authorized inspection agencies
can exist
four types
who has ultimate responsibility for complying with the
provisions of the API 653 standard
the owner-operator
THEIR CORRECT SOLUTIONS
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
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
, what is the height of the lead symbol B that shall be
attached to the back of each film holder during each
exposure to determine if Backscatter radiation is
exposing the film
1/2 inch
any work on a tank that changes its physical
dimensions or configuration is called an
alteration
which Annex of API 653 provides guides about above
ground storage tanks inspector certification
Annex D
the maximum permissible limit of exposure to organic
lead in a normal 8 hour work day is
2 micrograms of organic lead per cubic feet
the full course width for shell plate as per API 650
shall be a minimum of
72 in
in accordance with API standard 653, critical zone for
repairs to a tank bottom is that portion, which is
measured radially inward within 3 inches of the Inside
Edge of the shell
as per API standard 653 a routine in-service visual
external inspection of an above ground storage tank
shall be done every
one month
how many types of authorized inspection agencies
can exist
four types
who has ultimate responsibility for complying with the
provisions of the API 653 standard
the owner-operator
