Certified Pipefitter Blueprint Reading and Symbols Questions and Answers

Question 1

On a piping isometric drawing, what does the abbreviation 'EL' typically precede?

Accepted Answer

The elevation of a pipe's centerline

Answer

In piping isometric drawings, 'EL' stands for Elevation. It is used to indicate the vertical distance of a pipe's centerline from a specific reference point or datum, such as sea level or a finished floor.

Question 2

A pipefitter is reviewing a P&ID and sees a valve symbol represented by two triangles pointing towards each other with a solid black circle in the middle. What type of valve does this symbol represent?

Accepted Answer

Globe Valve

Answer

The standard symbol for a valve is two triangles pointing at each other. The character in the middle specifies the valve type. A solid or filled-in circle indicates a Globe valve.

Question 3

While examining a welding symbol on a blueprint, a pipefitter notes a small flag at the junction of the reference line and the arrow. What does this flag signify?

Accepted Answer

The weld must be performed on-site (field weld).

Answer

A flag on a welding symbol indicates that the weld is a 'field weld,' meaning it must be completed at the construction or installation site rather than in a controlled shop environment.

Question 4

A blueprint shows a pipeline with the label '6"-CS150-A-1021'. Which part of this label most likely indicates the nominal pipe size?

Accepted Answer

6"

Answer

In standard pipe labeling conventions, the first number followed by an inch symbol (") denotes the Nominal Pipe Size (NPS). In this case, '6"' indicates a 6-inch nominal pipe size.

Question 5

Which of the following drawing types is NOT drawn to scale but provides a three-dimensional representation of a single pipeline, showing all fittings, dimensions, and elevations?

Accepted Answer

Piping Isometric Drawing

Answer

Piping isometric drawings are unique in that they show a single pipe run in a 3D view. They are not drawn to scale; instead, dimensions are written directly on the drawing to ensure accuracy for fabrication and installation.

Certified Pipefitter Practice Test

Certified Pipefitter Practice Test

Certified Pipefitter Blueprint Reading and Symbols Questions and Answers