lockhart day 2 training

Question 1

What are 2 NDE methods that are normally used to determine tank bottom corrosion?

Answer 1

1. UT and MFL

Question 2

Min required thickness of the projection of the bottom plate outside the bottom to shell weld ?

Answer 2

0.1”

Question 3

How far must the plate extend past the bottom to shell per API653?

Answer 3

3/8”

Question 4

require interval and who for routine inspection

Answer 4

monthly/operator

Question 5

require interval and who for external inspection

Answer 5

5 years or RCA/4N (lessor) / AI

Question 6

require interval and who for UT if CR is known

Answer 6

15 years or RCA/2N (lessor) / (not specified)

Question 7

require interval and who for UT if CR is not known

Answer 7

5 years

Question 8

require interval and who for internal inspection

Answer 8

10 years w/o safeguard or RPS

Question 9

initial internal inspection max ?

Answer 9

1. 10 years w/o safe guard or RPB
2. 20 years with safe guard but no RPB
3. 30 years with RPB

Question 10

subsequent internal intervals?

Answer 10

1. 10 years w/o safe guard or RPB
2. 20 years with safe guard but no RPB
3. 30 years with RPB

Question 11

When is brittle not a concern? at what stress?

Answer 11

when less than 7000 KSI , no brittle concern

Question 12

what temp is brittle not a concern?

Answer 12

greater 60F

Question 13

What thickness is brittle not a concern

Answer 13

less than 1/2”

Question 14

API651

Answer 14

cathodic protection

Question 15

Require inspection interval for cathodic?

Answer 15

annually

Question 16

Required inspection interval for impressed current?

Answer 16

at least 2 months

Question 17

when can an on stream inspection be performed in lieu of visual internal inspection?

Answer 17

when the inspection is being performed to determine the condition of the tank bottom

Question 18

By what date must owner/operator comply with API653?

Answer 18

1/2012

Question 19

when can pitted corrosion be ignored (2)

Answer 19

1. 8” length total pitting length cannot exceed 2”

2. tremaining&raquo_space; 50% of tmin

Question 20

tank with highly viscous material which will solidify below what temp is not required to meet max internal inspection interval requirement?

Answer 20

110F

Question 21

how often must RBI assessment be reviewed?

Answer 21

10 years or sooner

Question 22

when is it allow to not scan the tank bottom during an internal inspection?

Answer 22

when the bottom thickness can be determine by external means

Question 23

What must be done if material is unknown?

Answer 23

Chemical analysis, charpy V , tension test

Question 24

when is CR subtracted to liquid height calculation

Answer 24

when Height of product is needed (not done for height for hydro) and only for uniform corrosion (NOT LTA)

Question 25

for height calculation if given t1 and t2, what do you use?

Answer 25

t1 - average thickness

Question 26

material spec for structural material code?

Answer 26

a36 or a992

Question 27

records should be maintained by owner? (3)

Answer 27

1. construction records
2. inspections
3. repair history

Question 28

when is alternative internal inspection permitted?

Answer 28

when size is limited for entry