Line Sizes / Percentages

Question 1

Repad - Nozzle size that never requires a repad

Answer 1

< or = 2NPS

Question 2

RT - Max pipe size when using a RT elliptical shot (double wall technique, double wall view)

Answer 2

3 NPS

Question 3

Hot Tap - Max nozzle size that can be hot tapped when course thickness is >1/2” and shell has unknown toughness

Answer 3

4 NPS

Question 4

Repairs - On existing tank, new nozzle must use insert plate if shell is over 1/2” thick and shell material does not meet current MDMT requirements

Answer 4

> 4 NPS

Question 5

Definition - When adding a new nozzle, nozzle size to be considered a major alteration

Answer 5

> 12 NPS

Question 6

NDE - Limits of RT film density of weld as compared to IQI (range)

Answer 6

-15 to +30%

Question 7

AI - Time inspector needs to be involved in inspection to maintain 653

Answer 7

20%

Question 8

RT Reconstruction - % of weld intersections (new welds to old welds) that need to be RT’d

Answer 8

25%

Question 9

Max relative humidity when installing tank bottom linings

Answer 9

80%

Question 10

% to RT when installing a new insert plate with a nozzle into an existing shell plate

Answer 10

100%