Pipe Fabrication Methods Flashcards

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?

Answer: 2 cuts

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

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

Answer: Saddle or Weldolet fitting

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.

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

Answer: To change pipe direction in two planes simultaneously

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

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

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

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.

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

Answer: Use of fabrication fixtures and rolling stands

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

What is the correct sequence when laying out a pipe spool for fabrication?

Answer: Mark, cut, fit-up, weld

The correct sequence is mark (layout), cut to length, fit-up components, then weld — ensuring accuracy before committing to cuts.

When fabricating a concentric reducer using plate, the transition cone is developed using which geometric method?

Answer: Radial line development

Concentric reducer cones are developed using radial line development, where lines radiate from a common apex point of the cone.