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API 635 CERTIFICATION EXAM
NEWEST 2025 WITH 250 QUESTIONS
AND VERIFIED DETAILED ANSWERS
BRAND NEW!!
With regard to the thickness of the repair plate at the perimeter of
the repair plate, when a lapped patch repair plate is used to
reinforce the thickness of a shell, which of the following is
correct?
a) The repair plate shall not exceed the thickness of the shell plate
by more than ¼th but no more than 1/8th inch. The maximum
repair plate thickness is l/2 inch.
b) The repair plate shall not exceed the thickness of the shell plate
by more than 1/3 rd but no more than l/4 th inch. The maximum
repair plate thickness is l/2inch.
c) The repair plate shall not exceed the thickness of the shell plate
by more than 1/3 rd but no more than l/8 th inch. The maximum
repair plate thickness is l/2 inch.
d) The repair plate shall not exceed the thickness of the shell plate
by more than ¼ th but no more than l/3rd inch. The maximum
repair plate thickness is l/2inch. - ANSWER-C
The minimum dimension for a replacement shall plate shall
be_______ inches or __________ thickness of the replacement
plate whichever is_______.
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a) 12, 12, greater
b) 12, 12, lesser
c) 18, 18, greater
d) 18, 18, lesser - ANSWER-A
Unless an entire shell plate is replaced, the replacement plate may
be circular, oblong, square or rectangular provide the corners are
a) Provided with a radius of at least 1 inch
b) Provided with a radius of at least 3% of the short dimension of
the plate
c) Provided with a radius of at least 3 inches
d) Provided with rounded corners - ANSWER-D
Prior to welding the new vertical joints, the existing horizontal
joints shall be cut for a minimum distance of _______ inches
beyond the new vertical joints.
a) Six
b) Eight
c) Twelve
d) Sixteen - ANSWER-C
Vertical joints shall be welded before the horizontal joints.
a) True
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b) False - ANSWER-A
For existing shell plates over ½ " thick, the outer edge of the butt
weld, attaching the replacement shell plate shall be at least
_______ times the weld thickness or _______ inches whichever is
greater from the outer edge of any existing butt-welded shell
joints.
a) 12, 10
b) 10, 12
c) 8, 10
d) 10, 8 - ANSWER-C
For existing shell plates ½ " thick and less, the outer edge of the
butt weld, attaching the replacement shell plate may be reduced
to _______ inches from the outer edge of vertical joints or
_______inches from the outer edge of horizontal joints.
a) 10, 8
b) 9, 6
c) 6, 9
d) 6, 3 - ANSWER-D
For existing shell plates over 1/2" thick, the outer edge of the butt
weld, attaching the replacement shell plate shall be at least
_______ times the weld size or _______ inches, whichever is
greater, from the edge (toe) of the fillet weld attaching the bottom
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shell course to the bottom. This rule does not apply if the
replacement shell plate extends to and intersects with the bottom-
to-shell joint at approximately _______ degrees.
a) 8, 10, 45
b) 8, 10, 90
c) 8, 10, 60
d) There are no exceptions - ANSWER-B
The edge of any vertical weld joint attaching a replacement plate
shall be at least how far from the edge of the weld joint in the
annular plate ring or sketch plate?
a) Eight inches
b) Ten inches
c) Twelve inches
d) Six inches - ANSWER-C
Lapped patch shell repairs are an acceptable form of repair for
butt-welded, lap-welded, and riveted tank shell only when
specified by:
a) The Authorized Inspector
b) Repair organization
c) The insurance company
d) The owner/operator - ANSWER-D
API 635 CERTIFICATION EXAM
NEWEST 2025 WITH 250 QUESTIONS
AND VERIFIED DETAILED ANSWERS
BRAND NEW!!
With regard to the thickness of the repair plate at the perimeter of
the repair plate, when a lapped patch repair plate is used to
reinforce the thickness of a shell, which of the following is
correct?
a) The repair plate shall not exceed the thickness of the shell plate
by more than ¼th but no more than 1/8th inch. The maximum
repair plate thickness is l/2 inch.
b) The repair plate shall not exceed the thickness of the shell plate
by more than 1/3 rd but no more than l/4 th inch. The maximum
repair plate thickness is l/2inch.
c) The repair plate shall not exceed the thickness of the shell plate
by more than 1/3 rd but no more than l/8 th inch. The maximum
repair plate thickness is l/2 inch.
d) The repair plate shall not exceed the thickness of the shell plate
by more than ¼ th but no more than l/3rd inch. The maximum
repair plate thickness is l/2inch. - ANSWER-C
The minimum dimension for a replacement shall plate shall
be_______ inches or __________ thickness of the replacement
plate whichever is_______.
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a) 12, 12, greater
b) 12, 12, lesser
c) 18, 18, greater
d) 18, 18, lesser - ANSWER-A
Unless an entire shell plate is replaced, the replacement plate may
be circular, oblong, square or rectangular provide the corners are
a) Provided with a radius of at least 1 inch
b) Provided with a radius of at least 3% of the short dimension of
the plate
c) Provided with a radius of at least 3 inches
d) Provided with rounded corners - ANSWER-D
Prior to welding the new vertical joints, the existing horizontal
joints shall be cut for a minimum distance of _______ inches
beyond the new vertical joints.
a) Six
b) Eight
c) Twelve
d) Sixteen - ANSWER-C
Vertical joints shall be welded before the horizontal joints.
a) True
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b) False - ANSWER-A
For existing shell plates over ½ " thick, the outer edge of the butt
weld, attaching the replacement shell plate shall be at least
_______ times the weld thickness or _______ inches whichever is
greater from the outer edge of any existing butt-welded shell
joints.
a) 12, 10
b) 10, 12
c) 8, 10
d) 10, 8 - ANSWER-C
For existing shell plates ½ " thick and less, the outer edge of the
butt weld, attaching the replacement shell plate may be reduced
to _______ inches from the outer edge of vertical joints or
_______inches from the outer edge of horizontal joints.
a) 10, 8
b) 9, 6
c) 6, 9
d) 6, 3 - ANSWER-D
For existing shell plates over 1/2" thick, the outer edge of the butt
weld, attaching the replacement shell plate shall be at least
_______ times the weld size or _______ inches, whichever is
greater, from the edge (toe) of the fillet weld attaching the bottom
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shell course to the bottom. This rule does not apply if the
replacement shell plate extends to and intersects with the bottom-
to-shell joint at approximately _______ degrees.
a) 8, 10, 45
b) 8, 10, 90
c) 8, 10, 60
d) There are no exceptions - ANSWER-B
The edge of any vertical weld joint attaching a replacement plate
shall be at least how far from the edge of the weld joint in the
annular plate ring or sketch plate?
a) Eight inches
b) Ten inches
c) Twelve inches
d) Six inches - ANSWER-C
Lapped patch shell repairs are an acceptable form of repair for
butt-welded, lap-welded, and riveted tank shell only when
specified by:
a) The Authorized Inspector
b) Repair organization
c) The insurance company
d) The owner/operator - ANSWER-D
