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Pipe Fittings

03 February, 2023


Piping isometrics let the pipe be drawn by which the length, width, and depth are shown in a single view. Isometrics are commonly drawn from information on a plan and elevation views. The symbols the resemble the fittings, valves, and flanges are altered to adapt to the isometric grid.

This infographic will allow you to understand the piping coordination systems symbols for isometrics to properly fit your pipes.



The following is a transcript of the Pipe Fitting Infographic:

Piping Coordination Systems Symbols for Isometrics


  • Elbow 90
  • Elbow 45
  • Tee Equal
  • Tee Reducing
  • Cap
  • Reducing Concentric (Butt Weld only)
  • Reducing Eccentric (Butt Weld only)

Butt Weld Symbol, Socket Weld Symbol, Threaded Symbol


Welding Neck, Socket Weld, Threaded, Slip-On, Lap-Joint, Blind


  • Gate
  • Globe
  • Ball
  • Plug
  • Butterfly (No Socket or Threaded Symbol)
  • Needle
  • Diaphragm
  • Y-type
  • Three-way
  • Check
  • Bottom (Flanged Symbol only)
  • Relief (Flanged Symbol only)
  • Control Straight (Flanged Symbol only)
  • Control Angle (Flanged Symbol only)

Butt Weld Symbol, Flanged Symbol, Socket or Threaded Symbol, Valves, Image


  • Branch outlet Weldolet
  • Branch outlet Nipolet
  • Flanged branch Outlet Flangolet
  • Spade
  • Spectacle blind
  • Hammer blind
  • Spacer
  • Restriction orifice
  • Field Weld
  • Butt Weld
  • Pipe to pipe Connection
  • Pipe bend with Special radius
  • Sight glass
  • Direction of hand Wheel/wrench
  • Y-type strainer
  • Conical strainer
  • Conical strainer built-in
  • Orifice assembly (typical showing position of taps)
  • Meter run orifice assembly (typical) flanged/butt weld

Note: Symbols are shown in black lines. Lighter lines show connected pipe, and are not parts of the symbols.