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How To Read Isometric Drawing

The document provides instructions on how to read isometric drawings. It explains that a pipe in an isometric view is drawn with a single line along the centerline and dimensions are measured from that line, not the outside of the pipe. It also provides examples of routing directions for piping starting from a point and includes notes on isometric orientation, dimensions, and calculating pipe lengths.

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BLY YEDEKPA NOEL BENITO
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874 views7 pages

How To Read Isometric Drawing

The document provides instructions on how to read isometric drawings. It explains that a pipe in an isometric view is drawn with a single line along the centerline and dimensions are measured from that line, not the outside of the pipe. It also provides examples of routing directions for piping starting from a point and includes notes on isometric orientation, dimensions, and calculating pipe lengths.

Uploaded by

BLY YEDEKPA NOEL BENITO
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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How to read Isometric drawing

1- A pipe into a isometric view, is always drawn by a single line.


2- This single line is the centerline of the pipe, and from that line, the
dimensions measured. So, not from the outside of a pipe or fitting.
3- The image below shows a orthographic view of a butt welded pipe
with three sizes (A, B, C).

4- The above drawing is very simple and quick to implement.


5- The red lines show the pipe, the black dots are the butt welds and A, B and C are
the dimensions of front to center line and center line to center line.
Routing starting point X

• pipe runs to the east


• pipe runs up
• pipe runs to the north
• pipe runs to the west
• pipe runs down

Routing starting point X

• pipe runs to the south


• pipe runs up
• pipe runs to the west
• pipe runs to the north
• pipe runs down
Routing starting point X

• pipe runs to the south


• pipe runs up
• pipe runs up and to the west
• pipe runs up
• pipe runs to the west
• pipe runs to the north-west
• pipe runs to the north

Routing starting point X

• pipe runs to the south


• pipe runs up
• pipe runs up and to the north-
west
• pipe runs to the north
Routing starting point X

• pipe runs up
• pipe runs up and to the east
• pipe runs up

Routing starting point X

• pipe runs up
• pipe runs up and to the north
• pipe runs up
Routing starting point X

• pipe runs up
• pipe runs up and to the north-
west
• pipe runs to the north

Important Notes
The Iso, as isometric are commonly referred, is oriented on the grid relative to the north arrow found on plan
drawings. Because iso's are not drawn to scale, dimensions are required to specify exact lengths of piping
runs.
Pipe lengths are determined through calculations using coordinates and elevations. Vertical lengths
of pipe are calculated using elevations, while horizontal lengths are caculated using north-south
and east-west coordinates.
ISOMETRIC SYMBOLS

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