Piping drawing and symbols

Piping drawing and symbols

                         Piping and isometric Drawing 

Isometric:

Unlike orthographic, piping isometrics allow 

the pipe to be drawn in a manner by which the

 length, width and depth are shown in a single

 view. Isometrics are usually drawn from 

information found on a plan and elevation 

views. The symbols that represent fittings,

Valves and flanges are modified to adapt to 

the isometric grid. Usually, piping isometrics 

are drawn on

HOW TO READ A PIPING ISOMETRIC

A pipe into a isometric view, is always drawn by a single line. This single line is the center line of the pipe, and from that line, the dimensions measured. So, not from the outside of a pipe or fitting.
The image below shows a orthographic view of a butt welded pipe with three sizes (A, B, C).

·         The A size is measured from the front to the center line of the elbow / pipe.

·         The B size is measured from center line to center line.

·         The C size is like the A size, measured from the front to the center line of the 

Drawing Isometric Offsets:

Offset:

indicates that a piece of pipe is shifted from one line of direction to another

 is done with a fitting (typically a 45° elbow)

 one of the few times you might have “artistic license” in making a piping drawing

Horizontal offsets:

If you draw a horizontal pipe with a 45°

Elbow running form southeast to northwest

Technically correct, it would look like a

Vertical line… to prevent confusion, the

Offset is drawn 22 ½ ° from vertical to give.The illusion of the angle

Vertical Offsets

These offset can get just as confusion as the horizontal offset

                                   

                                     PIPE FITTING SYMBOLS: