Pipe connection

Pipe connection is varied, the commonly used have Butt weld, Flanged, Threaded, Socket weld, Glued, Brazed and Grooved end.

You assign connection types in the Connector Properties dialog box as you build fittings content using the Content Builder (see Adding Connectors to a Parametric Fitting). Assigned connection types are then displayed on the Connection Assignments tab of the Pipe Layout Preferences dialog box.

Unthreaded Connections are not threaded, must be either welded or bolted together. The following table shows the different orientations of pipe connection types:

Butt weld:
A butt weld is two pipes lined up with one another and welded along the contact edge to create a seal.

Butt weld
No extra objects are added.

Fittings and pipe segments connect directly to each other.

Flanged All types
A flange is a plate or ring that is attached to a pipe. Two flanged pipe then create a tight seal by being bolted together.


  • Fitting to pipe: Flanges are typically included on fittings. A separate flange is added to the pipe segment.
  • Pipe to pipe: A separate flange is added to each pipe end to create the connection.
  • Fitting to fitting: Fittings with inherent flanges connect directly to each other. No separate flanges are added to the connection.

Threaded, Socket weld, Glued, Brazed
The pipe is the male fitting and the socket is equivalent to a female fitting. To provide a tight seal it is best to line the outside of the pipe and the inside of the socket with a sealant.

Socket welds require a pipe and socket connection.

  • Fitting to pipe: Pipe segments typically have inherent male ends, and fittings are typically female. The pipe inserts directly into the fitting.
  • Pipe to pipe: A female coupling is inserted between the pipe segments.
  • Fitting to fitting: Fittings connect directly to each other.

Grooved end
A grooved end fitting has a groove or shoulder along the edge. This fittings groove allows for a seal without the need for welding.


  • Fitting to pipe: Fittings and pipe segments are considered to have grooved ends that are ready to accept a coupling. A coupling is added to connect the fitting and pipe.
  • Pipe to pipe: A coupling is added to connect the pipe segments.
  • Fitting to fitting: A coupling is added to connect fittings.


The Piping domain includes a connection type called Same Connection. When Same Connection is configured for a pipe object that is attached to a hub, connector 1 inherits the connection type of the connection type on connector 2 of the attached hub.

Welded pipes by manufacturing process

Sunny Steel produce an extensive selection of welded steel pipe including ERW, HFI, EFW, LSAW, DSAW and UOE type carbon steel pipe along with their respective flanges and fittings.

Electric Resistance Welded Pipe
High Frequency Induction (HFI) Welded Pipe
UOE (Uing and Oing forming) Pipes

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