Miscellaneous Numbers

Question 1

Roofs - Maximum amount of primary seal that can be removed for repair while tank is still in service

Answer 1

1/4

653: 9.14.1

Question 2

NDE - Minimum number of RT’s required on a circular shell replacement plate

Answer 2

1

653: 12.2.1.6.1

Question 3

FFS – Current joint efficiency “E” in API 650

Answer 3

1.0

653: Table 4.2

Question 4

FFS – Joint Efficiency “E” – Calculating tmin for an LTA, when LTA is away from rivets by > 6”

Answer 4

1.0

653: 4.3.4.1

Question 5

FFS – Joint Efficiency “E” – Calculating tmin for an LTA, when LTA is away from weld by greater of: 1” or 2t

Answer 5

1.0

653: 4.3.3.1
“E” defined

Question 6

Reconstruction - Number of sets of center punch marks located on top and bottom edges of each shell piece

Answer 6

2

653: 10.3.5.2

Question 7

Weld Qualification - Number of tension tests to qualify a WPS

Answer 7

2

IX: QW451.1

Question 8

Weld Qualification - Number of bend tests to qualify a welder or welding operator in welding positions 1G-4G

Answer 8

2

IX: QW452.1.a

Question 9

NDE - Minimum # of exposures to RT 360o
of a weld using a double-wall technique, double-wall view (elliptical shot)

Answer 9

2

V: T-271.2.b.1

Question 10

NDE - RT film Density Range - allowed for the weld & IQI when using a gamma ray source

Answer 10

2.0 – 4.0

V: T-282.1

Question 11

NDE - Minimum # of exposures to RT 360 deg of a weld using a double-wall technique, single-wall view

Answer 11

3

V: T-271.2.a

Question 12

Impact Test - Number of test bars required in each set of impact test specimens

Answer 12

3

650: 4.2.9.3

Question 13

NDE - When using a shim under a hole-type IQI, the number of sides of the IQI that must be seen in the RT image

Answer 13

3

V: T-277.3

Question 14

Hot Tap - Minimum number of UT readings around the circumference of a new hot tapped nozzle

Answer 14

4

653: 9.15.3.2

Question 15

Weld Qualification - Number of bend tests to qualify a WPS

Answer 15

4

IX: QW451.1

Question 16

Weld Qualification - Number of bend tests required to qualify a welder in welding positions 5G & 6G

Answer 16

4

IX: QW452.1.a
Note 1

Question 17

FFS - Corrosion Averaging in a Shell LTA - Minimum # of UT readings to take on each designated vertical line.

Answer 17

5

653: 4.3.2.1.c

Question 18

NDE - Minimum number of RT’s required on a square or rectangular shell replacement plate

Answer 18

6

653: 12.2.1.6.2

Question 19

Settlement - Minimum number of settlement points around circumference

Answer 19

8

653: 12.5.2 &
Fig B.1