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Easy GuideWhere to Set Elevation

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IntroductionFlowmaster can take account of elevation by inputting ‘level’ data at nodes. The level is from a fixed datumpoint as shown below.

 

ExampleCreate a new network as below by using pipes, bends and pumps, using the values shown on the diagram.Whilst inputting the data, select the analysis type to be Incompressible Steady State to show the data fields

which have to be completed. Note the negative figure on the flow source to highlight it is a demand.

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Once modelled, run the model as steady state. Look at the results forthe node nearest the flow demand. This should show a pressure at

node level result of 2.27 bar.

Clear the current collection, and then collect the two nodes betweenthe bend and the flow demand components. Click on the levelproperty in the data fields, and then select the toggle icon (see right)and set the level of both nodes to 10m.

Re-run the simulation. The pressure at node level should now be 1.29bar. You can see from the results that Flowmaster also produces aresult which is termed node pressure. The difference between thesetwo results being of course that node pressure is the result from a

network which is assumed level i.e. no elevation.

This is defined as:

Pressure

Absolute Total Pressure = Ptotal + ATM Pressure

Whereas Ptotal = Pstatic +

And Absolute Static Pressure = Pstatic + ATM Pressure

[note. Pstatic is the gauge static pressure]

Pressure at Node level

Pat_node_level

= Pstatic + Pdynamic

Or Pat_node_level

 = Ptotal -

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