Line Sizes

Question 1

Repad - Nozzle size that never requires a repad

Answer 1

<= 2 NPS

650: 5.7.2.1

Question 2

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

Answer 2

3 NPS
(3-1/2” O.D.)

V: T-271.2.b

Question 3

Hot Tap - Maximum nozzle size that can be hot tapped when shell has unknown toughness

Answer 3

4 NPS 653: 9.15.1.1.b.1

Question 4

Repairs – On existing tank, new nozzle must use insert plate if shell is over ½” thick and shell material does not meet current MDMT requirements

Answer 4

> 4 NPS

653: 9.9.6

Question 5

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

Answer 5

> 12 NPS

653: 3.26.a