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 HYTRAN: 3-Step transient analysis

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  Hytran

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Step 1:

The screen image below shows the pipe system to be simulated. It comprises a downstream pump delivering to an upstream reservoir. Horizontal and vertical scales are selected and the pipe layout simply click-and-dragged on screen, lengths and elevations being approximated to the chosen scales. Actual lengths and elevations can then be defined using the Data Input dialogs or via the List dialog shown.

The coloured vertical lines at the pump and high point location are user-defined and generate a real-time display of transients at those locations.

This is the same model as illustrated on the preceding page.

Step 2:

In this step we define the bounday conditions. There are three boundaries in the model, the Pump Station, the Air Relief Valve and the Reservoir. The input dialogue for the air relief valve is shown, indicating a 3-stage Anti Surge Valve has been selected in an effort to ameliorate the high pressures generate by pump trip shown in the image on the previous page.

Plot Nodes have been specified at the Pump Station (1-blue) and the Air Relief Valve (2-red).

Step 3:

The image below shows a 150s run of the system and displays the following:

  • The pipe line with arrows indicating direction of fllow at the 150s time - blue in the forward direction, red in the reverse direction.
  • The steady state hydraulic grade line (blue). Pump head about 62m.
  • The upper and lower dotted lines showing the envelope of maximum and minimum pressures along the pipeline.
  • The black wavy line showing the pressures along the pipeline at the 150s time.
  • The insert graph showing the time-dependent pressures at the two plot node positions - the pump (blue) and the air relief valve (red).

Compare the pump pressure transients with the image on the previous page - the same system but without the air relief valve. The valve has cushioned the system, reducing the effect of colomn separation to more manageable values. Without the 3-Stage Air Relief Valve the head at the pump peaked at 230m; with the valve the head was reduced to 85m.

 HYTRAN: 3-Step transient analysis

 Previous
  Hytran

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