How to Make a Venturi Pipe

Written by sean lancaster
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How to Make a Venturi Pipe
Obtain better aeration or mixing by using a venturi pipe. (mixing colours image by Pix by Marti from

The venturi effect creates efficient mixing and, in other applications, generates a vacuum in the region following the restriction in the flow. To achieve the venturi effect, place a restriction in a tube with a flowing liquid. As the liquid exits the restriction in the tube, it travels faster than it was prior to the restriction. The region just past the exit experiences a drop in pressure as the flow pulls on the region outside of the main flow. If the region exiting the restriction is open to the air, air mixes with the liquid in the flow and serves as means of aerating the liquid. This technique is useful for enhancing the aeration of a pond.

Skill level:

Things you need

  • 2 lengths of pipe
  • Sheet of cardboard
  • Scissors
  • Brass T compression fitting
  • Propane torch
  • Wide jaw vice
  • Plumber's unfluxed solder
  • Solder flux
  • Drill
  • 15mm drill bit
  • 12mm drill bit
  • 4mm drill bit

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  1. 1

    Trace around one of the pipes on the cardboard with a pencil. Draw six circles and cut them out of the cardboard as accurately as possible. These will serve as gaskets on the compression T.

  2. 2

    Place three cardboard gaskets in each side of the compression T. The side arm of the T should be pointing up.

  3. 3

    Place the two pieces of pipe in the sides of the T to press against the gaskets. Clamp this assembly between the jaws of a wide vice. Direct the side arm in the up direction.

  4. 4

    Heat the assembly with a propane torch until the solder melts and flows into the bottom of the T from the top of the side arm. Continue to heat the assembly and add solder until the assembly fills with solder to the top of the straight section used for the pipe.

  5. 5

    Dab a small amount of flux around the top of the solder in the side arm to ensure the solder wets the brass T. Allow the assembly to cool until you can handle it.

  6. 6

    Remove the pipes and cardboard gaskets. Inspect the compression T to make sure the solder sealed against the brass fitting without gaps or bubbles. The faces of the solder should be flat.

  7. 7

    Drill a 12mm hole through the centre of the brass compression fitting. The side arm of the T is still solid.

  8. 8

    Drill a 4mm hole through the solder in the side arm angled from the centre to just short of the end of the solder in the 12mm hole at the bottom.

  9. 9

    Use a larger drill bit to bevel the two sides of the 12mm hole. Twist the drill bit by hand to open the start and end of the 12mm hole. The solder block now has a bevelled edge at the start and end of a 12mm hole through the block. There is a 4mm hole at the start of the exit bevel coming from the side arm.

Tips and warnings

  • Use goggles and gloves when using the solder and propane torch.
  • Do not breathe the fumes from the hot solder or flux.

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