How to Convert a Pressure Drop into an Equivalent Length Using PIPENET
PIPENET provides several ways of converting a pressure drop into an equivalent length. This operation is most likely to be performed in the PIPENET Spray/Sprinkler Module. Therefore, the examples below are based on Spray/Sprinkler Module calculations.
Let us suppose that we have an item such as a strainer in a fire protection system. The known data is the following:
Diameter = 100 mm nominal size of Schedule 40 pipe
Pressure drop = 0.3 bar
Flowrate = 1000 lit/min
2. A PIPENET Spray/Sprinkler Module calculation using the following data:
Input a pipe with a diameter of 100 mm and length of 100 m.
Set the inlet pressure to 10 barg and the outlet flowrate to 1000 lit/min. Perform a calculation.
Note that the pressure drop is 0.4988825 bar
3. Calculate the Equivalent Length:
A Length of 100 m gives a pressure drop of 0.4988825 bar. So the length which will give a pressure drop of 0.3 bar is 100 x 0.3 / 0.4988825 = 60.1344 m
4. Alternative Approach:
A simpler method might be to use the general pressure loss model of PIPENET Spray/Sprinkler Module. The dialog box is shown below.