Butt Welding

Question 1

Name the 2 most common pressure rated butt weld pipe:

Answer 1

1) 3000
2) 6000

Question 2

What is the thermal expansion gap on a socket weld?

Answer 2

1/16”-1/8”

Question 3

End of the pipe to the center of the fitting?

Answer 3

Takeout

Question 4

What type of flange is double welded to the pipe?

Answer 4

Slip on flange

Question 5

How do you determine the takeout on a long radius 90° fitting?

Answer 5

1 1/2 x pipe diameter

Question 6

How do you determine the takeout for a 45° fitting?

Answer 6

.625 x pipe diameter

Question 7

What is the weld gap on butt welds?

Answer 7

1/16”-1/8”

Question 8

What is the take out of a butt weld fitting?

Answer 8

Face to center + gap

Question 9

Name 3 common flange types:

Answer 9

1) Slip on
2) Weld neck
3) Lap joint

Question 10

What is the strongest most permanent weld joint?

Answer 10

Butt weld

Question 11

What is the purpose of 2 holing a flange?

Answer 11

To align mating flange bolt holes

Question 12

Slip on flange normal practice is to extend the flange how far past the pipe?

Answer 12

3/8” or pipe wall thickness

Question 13

Flat end of pipe after pipe has been chamfered?

Answer 13

Land

Question 14

Pipe can be socket welded up to _____ inches, but is rarely seen above _____ inches?

Answer 14

3
2

Question 15

Why can’t you socket weld galvanized?

Answer 15

Because it gives off poisonous gas

Question 16

What flange is preferred in severe services?

Answer 16

Weld neck flange

Question 17

Weld neck flange is marked with weight so that the _____ holes will match the pipe schedule.

Answer 17

Bore

Question 18

What are the 2 most common pipe fittings:

Answer 18

1) 90°
2) 45°

Question 19

Any 45° angle can be found by doing what?

Answer 19

Multiplying the rise of run x 1.414