Format #1: Junctions With One or Two Connecting Pipes

The first basic window format is for junction types that allow only one or two connecting pipes (see Figure 1). While junctions do not have an explicitly defined flow direction like pipes do, typically those with two pipes or less adopt a direction from the connecting pipes. For these junction types, upstream and downstream pipes are recognized by AFT xStream based on the reference positive flow direction of the connecting pipes. The upstream and downstream pipes are displayed separately near the top of the window.

In this first basic window type, it is generally important to have the pipes' reference positive flow directions specified in the physically correct directions. A good example of this is a Compressor junction. A compressor will add pressure to the system, but it does so only in the direction of positive flow through the connecting pipes. The compressor junction interprets where to add the pressure based on the directions of the connecting pipes.

To inspect in this window format, position the mouse pointer over the connected pipe ID and hold down the right mouse button.

Format #2: Junctions With More Than Two Connecting Pipes

The second basic window format for junction Properties windows is for junctions that allow more than two connecting pipes (see Figure 2). These junctions typically allow up to 25 connecting pipes; the exception is the Tee/Wye junction, which allows only three.

An example of this second window format is the Branch Properties window, shown in Figure 2, which has three connecting pipes.