API 653 Sec-10 (Dismantling and Reconstruction)

Question 1

All reconstruction work must be authorized by the ……………experienced in
storage tank design, prior to commencement of the work by a reconstruction organization (see 3.23)

Answer 1

authorized inspector or an engineer

Question 2

……………. in storage tank design shall approve all reconstruction work at the designated hold points and after reconstruction has been completed in accordance with the requirements
of this standard

Answer 2

The authorized inspector or an engineer experienced

Question 3

The tank shall be ………….d prior to commencement of dismantling

Answer 3

cleaned and gas-free

Question 4

Bottom plates that will be reused shall be cut by ……………. except where cuts cross existing weld seams

Answer 4

deseaming of lapwelds; or by cutting alongside of the

remaining welds at a minimum of 2 in. away from existing welds,

Question 5

Any shell ring may be dismantled by cutting out……………….For the purpose of this method, the minimum HAZ to be removed will be …………, on both sides of the weld seam.

Answer 5

• existing weld seams and the heat affected zone (HAZ) of the weld
• 1/2 of the weld metal width or 1/4 in., whichever is less

Question 6

Any shell ring ………… may be dismantled by cutting through the weld without removing the HAZ

Answer 6

1/2-in. thick or thinner

Question 7

Shell rings may be dismantled by cutting vertical and/or horizontal cuts through the shell a minimum of …………. away from existing welds, except where cuts cross existing welds.

Answer 7

6 in.

Question 8

Roof plates shall be cut by ………., or by cutting alongside of the ……………at aminimum of ……

Answer 8

deseaming of lap welds
remaining welds
2 in.

Question 9

Shell, bottom, and roof plates shall be ………….. prior to dismantling for ready identification and placement
when the tank is reconstructed

Answer 9

marked

Question 10

Marking material shall be of a ………….type

Answer 10

durable

Question 11

A minimum of …… sets of matching center punch marks shall be located on the top and bottom edges of
each shell plate to facilitate proper alignment during reconstruction

Answer 11

two

Question 12

New vertical joints in adjacent shell courses, made in accordance with 10.3.3.1, shall not be ………… but shall be offset from each other a minimum distance of …., where t is the plate thickness of the thicker course at the point of the offset

Answer 12

aligned

5t

Question 13

No welding of any kind shall be performed when the temperature of the base metal is less than ……

Answer 13

0 °F

Question 14

When the temperature of the base metal is between ……… or the thickness is in excess ….., the base metal within ….. of the place where welding is to be started shall be heated to a temperature ….. before welding.

Answer 14

0 °F and 32 °F
of 1 in
3 in.
warm to the hand
(approximately 140 °F)

Question 15

The edges of all welds shall ……..with the surface of the plate without a sharp angle

Answer 15

merge

Question 16

Tack welds used in the assembly of vertical joints of tank shells shall be ………. and shall not …….. in
the finished joint when the joints are welded …,,….

Answer 16

removed
remain
manually.

Question 17

When joints are welded by the …………… process, the tack welds shall be thoroughly cleaned of all welding slag but need …….. be removed

Answer 17

submerged-arc

not

Question 18

Tack welds shall be made using a ………… procedure qualified in accordance with ……..

Answer 18

fillet-weld or butt-weld

Section IX of the ASME Code

Question 19

Tack welds to be left in place shall be made by …………..

Answer 19

qualified welders.

Question 20

If weldable primer coatings have been applied on surfaces to be welded, they shall be ……….. in welding
procedure qualification tests for the brand, formulation, and maximum thickness of primer applied

Answer 20

included

Question 21

…………..electrodes shall be used for manual metal-arc welds, including the attachment of the ……………….

Answer 21

Low-hydrogen

first shell course to the bottom plates or annular plate ring,

Question 22

…………….shal be used for all welds in shell courses over …… thick of API 650 Group……….matrials

Answer 22

Low-hydrogen electrodes
1/2-in
I – III materials;

Question 23

………….for all welds in all shell courses of API 650 Group ………….materials

Answer 23

Low-hydrogen electrodes

IV – VI

Question 24

Low-hydrogen electrodes shall be used for welding temporary and new permanent attachments to
shells of API 650 Group ……………. materials

Answer 24

IV, IVA, V, or VI

Question 25

After the bottom plates are laid out and tacked, they shall be joined by welding the joints in a sequence that
results …………..from shrinkage and provides, as nearly as possible, a plane surface.

Answer 25

in the least distortion

Question 26

The welding of the shell to the bottom (except for door sheets) shall be completed prior to the welding of
………….

Answer 26

bottom joints

Question 27

Plates shall be held in close contact at all …………. during welding

Answer 27

lap joints

Question 28

Plates to be joined by butt welding shall be matched ………….and retained in position during welding

Answer 28

accurately

Question 29

Misalignment in completed vertical joints over 5/8-in. thick shall not exceed ………… of the plate thickness, with a maximum of ……..

Answer 29

10 %

1/8 in

Question 30

Misalignment in joints 5/8-in. thick or less shall not exceed ,…………. and………….. joints shall be completed
before the lower horizontal weld is made.

Answer 30

1/16 in.

Vertical

Question 31

In completed horizontal butt joints, the upper plate shall not project beyond the face of the lower plate at
any point by more than …………….of the thickness of the upper plate, with a maximum projection of …….., except that a projection of …….. is acceptable for upper plates less than …………thick.

Answer 31

20 %
1/8 in
1/16 in
5/16-in.

Question 32

For horizontal and vertical joints in tank shell courses constructed of material over ………. thick (based
on the thickness of the thicker plate at the joint), multi-pass weld procedures are required, with no pass more than ……… thick permitted. A minimum preheat of ,,,,,,,,is required of these welds

Answer 32

1 1/2-in.
3/4-in
200 °F

Question 33

Measurements to verify these tolerances shall be taken before the …………… test of the reconstructed
tank.

Answer 33

hydrostatic

Question 34

The maximum out-of-plumbness of the top of the shell relative to the bottom of the shell shall not exceed ………..
of the total tank height, with a maximum of …….

Answer 34

1/100

5 in

Question 35

The out-of-plumbness in one shell course shall not exceed the values specified for mill tolerances in
……….., whichever is applicable

Answer 35

ASTM A6 or ASTM A20

Question 36

With a horizontal sweep board ………… long, peaking shall not exceed ………

Answer 36

36-in.

1/2 in

Question 37

The sweep board shall be made to the true …………of the tank.

Answer 37

outside radius

Question 38

With a vertical sweep board 36-in. long, banding shall not exceed ………

Answer 38

1 in.

Question 39

where concrete ringwalls are provided under the shell, the top of the ringwall shall be level within …………. in any ……..of the circumference and within …… in the total circumference measured from the average elevation

Answer 39

±1/8 inches
30 ft
±1/4 inches

Question 40

where concrete ringwalls are not provided, the foundation under the shell shall be level within ……… in any ……. of circumference and within . in the total circumference measured from the average elevation

Answer 40

±1/8 in
10 ft
±1/2 in

Question 41

For foundations specified to be sloped from a horizontal plan, where concrete ringwalls are provided ……. in any ……….. of circumference and ……….. in the total circumference;

Answer 41

±1/8 inches
30 ft
±1/4 inches

Question 42

For foundations specified to be sloped from a horizontal plan, where concrete ringwalls are not provided, ……..inches in any …… of circumference and . inches in the total circumference

Answer 42

±1/8
10 ft
±1/2