Pipefitter Pipe Fabrication Methods 3

Question 1

When fabricating a 90-degree elbow using the miter cut method on 6-inch pipe, how many cuts are required to produce a two-piece miter?

Accepted Answer

2 cuts

Answer

A two-piece miter elbow requires 2 cuts, each at 45 degrees, which when welded together form a 90-degree change in direction.

Question 2

Which fabrication technique is used to create a branch connection on a pipe run without cutting out a full section of pipe?

Accepted Answer

Saddle or Weldolet fitting

Answer

A saddle or Weldolet fitting is welded directly onto the pipe run and requires only a hole to be cut, not removal of a full pipe section.

Question 3

What is the purpose of a 'rolling offset' in pipe fabrication?

Accepted Answer

To change pipe direction in two planes simultaneously

Answer

A rolling offset changes the direction of a pipe run in both the horizontal and vertical planes at the same time.

Question 4

In pipe fabrication, what does the term 'takeout' refer to?

Accepted Answer

The amount subtracted from the overall measurement to account for a fitting's end-to-center dimension

Answer

Takeout is the end-to-center dimension of a fitting that must be subtracted from the overall run length to determine the actual cut length of pipe.

Question 5

Which method is commonly used to fabricate large-diameter pipe spools in a shop environment to ensure dimensional accuracy?

Accepted Answer

Use of fabrication fixtures and rolling stands

Answer

Fabrication fixtures and rolling stands keep large-diameter spools aligned and supported during welding, ensuring dimensional accuracy.

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