Pipefitter Blueprint Reading and Symbols 4

Question 1

On an isometric piping drawing, what does a dashed circle with an 'X' through it typically represent?

Accepted Answer

A spectacle blind in the closed position

Answer

A dashed circle with an X indicates a spectacle blind (figure-8 blank) oriented in the closed/blinded position.

Question 2

Which line type on a piping drawing indicates a pipeline that is hidden behind another object or structure?

Accepted Answer

Hidden line (evenly spaced dashes)

Answer

Hidden lines are drawn as evenly spaced dashes to show features or pipes that exist but are concealed from the current view.

Question 3

On a P&ID, a triangle pointing downward connected to a pipe typically symbolizes what?

Accepted Answer

A drain point or funnel

Answer

A downward-pointing triangle or funnel symbol on a P&ID represents a drain point or open funnel drain.

Question 4

A pipefitter reads a drawing dimension noted as '6"-150# RF FLG'. What does '150#' indicate?

Accepted Answer

The ANSI/ASME pressure class rating of the flange

Answer

'150#' refers to the ANSI/ASME Class 150 pressure rating of the flange, defining its allowable pressure-temperature limits.

Question 5

In a plan view drawing, what do elevation markers (e.g., EL. 15'-6") on a piping drawing typically reference?

Accepted Answer

The height of the pipe's centerline above the finished floor or datum

Answer

Elevation markers on plan view piping drawings indicate the height of the pipe centerline above an established datum, usually finished floor (EL. 0'-0").

Certified Pipefitter Practice Test

Certified Pipefitter Practice Test

Pipefitter Blueprint Reading and Symbols 4