Pipefitter Blueprint and Drawing Interpretation 2

Question 1

What does the abbreviation 'BOP' mean on a piping isometric drawing?

Accepted Answer

Bottom of pipe

Answer

BOP stands for Bottom of Pipe and indicates the elevation measurement is taken from the bottom of the pipe.

Question 2

On a P&ID, what does a dashed line between two instruments typically represent?

Accepted Answer

An electrical signal connection

Answer

A dashed line on a P&ID between instruments represents an electrical signal connection.

Question 3

What does a weld symbol with the tail pointing to the right and an open circle at the arrow elbow indicate?

Accepted Answer

A field weld

Answer

An open circle (flag) at the elbow of the weld symbol arrow indicates a field weld, meaning it is to be performed at the job site.

Question 4

In a piping isometric drawing, what do the numbers 'N 45° E' represent?

Accepted Answer

A compass bearing for pipe routing direction

Answer

N 45° E is a compass bearing used on isometric drawings to indicate the pipe routing direction — 45 degrees east of north.

Question 5

What does Schedule 80 indicate on a pipe specification?

Accepted Answer

The wall thickness of the pipe

Answer

Schedule 80 refers to the wall thickness of the pipe — higher schedule numbers indicate thicker walls.

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