Hi all

Our current residential fire flow standard specifies a minimum residual pressure of 200kPa at the outlet of the hydrant for a fire flow of 10L/s. We use DN100 mushroom sealing and spring force closer hydrants.

To ensure this standard is achieved we wish to incorporate the headloss across the hydrant into our design modelling standards.

Has anyone ever undertaken any field tests to determine the actual headloss across this type of hydrant for a fire flow of 10 L/s? What hydrant headloss figures do other modellers use?