Gaskets And Piping

Question 1

What is your standard tapered pipe thread pitch?

Answer 1

3/4” per foot

60° thread angle

Question 2

Is a tongue and groove flange confined or unconfined?

Answer 2

Confined

Question 3

How much crush should you have for an o-ring gasket?

Answer 3

10%

Question 4

How do you find bolt hole spacing?

Answer 4

Angle method
-Divide the bolt hole circle (360°) by the number of spaces needed to match the bolt holes in the flange. Then, using a set of dividers, lay out the latter using a protractor to lay out the angle for that particular bolt pattern.

Chord method

Chord=sin(180/#BH) x BC

Question 5

How is pipe measured?

Answer 5

The outside stays a constant and the ID changes dependent on the pipe schedule.

Small number is small

Big number is big

Question 6

What are the three common solid metal ring designs?

Answer 6

Delta

Oval

Octagonal

Question 7

What are 2 reasons why gaskets move while in place?

Answer 7

Internal pressure

Bolt load