Section 10

Question 1

Who can authorize all tank reconstruction work?

Answer 1

Inspector or Engineer

API 653 par 10.1.3

Question 2

When dismantling a tank, how close to an existing weld can the tank bottom plates be cut if they are going to be reused?

Answer 2

2”

API 653 par 10.3.2.1

Question 3

When dismantling a tank by cutting out the existing weld, how much of the existing shell weld should be cut out?

Answer 3

Lesser of 1/2 of the weld width or 1/4” on each side of the welds, whichever is less

API 653 par 10.3.3.1a

Question 4

When dismantling a tank without cutting out the weld, how far from the existing shell welds should the cuts be made?

Answer 4

A minimum of 6” from the weld

API 653 par 10.3.3.1c

Question 5

If reusing bottom plates to recontruct a tank, what is the minimum distance to cut from existing bottom welds (if plates are not deseamed)?

Answer 5

2”

API 653 par 10.3.2.1

Question 6

When dismantling a tank, how should roof plates be cut out?

Answer 6

By deseaming or 2” away from existing welds if not deseaming

API 653 par 10.3.4.1

Question 7

How many sets of punch marks on top and bottom edges of shell plates are required to facilitate proper alignment during reconstruction?

Answer 7

2 sets

API 653 par 10.3.5.2

Question 8

During reconstruction of a tank, what is the base metal temperature where welding is not allowed?

Answer 8

< 0°F

API 653 par 10.4.2.3

Question 9

During reconstruction of tank, at what base metal temperature are your required to preheat to a temperature warm to the hand (~140°F)?

Answer 9

Between 0°F and 32°F

API 653 par 10.4.2.3

Question 10

During reconstruction of a tank, what is the required preheat for before welding members over 1½” thick?

Answer 10

200°F minimum

API 653 par 10.4.2.3 & 10.4.4.3

Question 11

During recontruction of tank, when is it necessary to remove the tack welds?

Answer 11

When a manual welding process is being used

API 653 par 10.4.2.7

Question 12

During reconstruction of tank, when is it not necessary to remove the tack welds?

Answer 12

When joints are welded with submerged arc process

API 653 par 10.4.2.7

Question 13

During reconstruction of tank, when is it required to weld the first shell course to the bottom plate or annular plate with low-hydrogen electrodes?

Answer 13

Shell course over ½” thick of API 650 Group I - III materials and all shell chourses of API 650 Group IV - VI

API 653 par 10.4.2.9

Question 14

During reconstruction of a tank, what should be welded first; shell to bottom joints or bottom joints?

Answer 14

Shell to bottom joints

API 653 par 10.4.3.2

Question 15

During reconstruction of a tank, when can misalignment at the vertical seam exceed 10% of the top shell plate thickness?

Answer 15

When upper plate is 5/8” or less thick (examplate; 0.250 top plate can be misaligned by 1/16” max, which is 25% of the 1/4” thickness).

API 653 par 10.4.4.1

Question 16

What is the maximum allowed shell misalignment for a reconstructed tank with a 1/2” shell thickness?

Answer 16

1/16” (0.0625”)

API 653 par 10.4.4.1

Question 17

During reconstruction of a tank, when can misalignment at the horizontal seam exceed 20% of the top shell plate thickness

Answer 17

When upper plate is less than 5/16” thick

API 653 par 10.4.4.2

Question 18

What is the maximum out-of-plumness of the top of the shell relative to the bottom of the shell for a reconstructed tank?

Answer 18

Lesser of 1/100 or 5”

API 653 par 10.5.2.1

Question 19

When measuring the peaking/banding of a tank, what is the required length for a sweep board?

Answer 19

36”

API 653 par 10.5.4 & 10.5.5

Question 20

What does peaking check for?

Answer 20

Deviations from the theoretical shape at a vertical weld

API 653 par 10.5.4 and API 650 par 7.5.4

Question 21

What does banding check for?

Answer 21

Deviations from the theoretical shape at the horizontal weld

API 653 par 10.5.5 and API 650 par 7.5.4

Question 22

What is the maximum allowed peaking for a 60’ diameter reconstructed tank?

Answer 22

1/2”

API 653 par 10.5.4

Question 23

What is the maximum allowed banding for a 60’ diameter reconstructed tank?

Answer 23

1”

API 6530 par 10.5.5

Question 24

When a concrete ring wall is used, what is the maximum allowed out-of-levelness under the shell for 120’ diameter tank at any point around the shell?

Answer 24

1/8”, in any 30’ of circumference

API 653 par 10.5.6.2

Question 25

When a concrete ring wall is used, what is the total allowed out-of-levelness under the shell for 120’ diameter tank?

Answer 25

1/4” of the average elevation

API 653 par 10.5.6.2

Question 26

When a concrete ring wall is not used, what is the maximum allowed out-of-levelness under the shell for 120’ diameter tank at any point around the shell?

Answer 26

1/8”, in any 10’ of circumference

API 653 par 10.5.6.2

Question 27

When a concrete ring wall is not used, what is the total allowed out-of-levelness under the shell for 120’ diameter tank?

Answer 27

1/2” of the average elevation

API 653 par 10.5.6.2