The Fire module of the Protector allows you to determine if delivering fire flows are possible during a breakdown or isolation event. In the Fire simulation, you are able to remove any portion of the hydraulic system by specifying a facility set (via the Isolation or Breakdown tabs) that has been involved in a contamination event. In effect, the Fire tab is capable of informing you if a fire can be extinguished should a portion of the system be closed.

Fire flow demands are combined with static demands in an additive fashion. Thus, when a fire demand is applied to a junction node, all demands (junction and fire) are combined and evaluated with the fire demand.

Facilities Management

Remove

Remove facilities from the current Facility set prior to running a fire simulation. It is best to run an Isolation or Breakdown simulation first in order to determine which facilities will need to be removed from the Fire simulation. Use the Browse  button to open the Selection Set manager.

Fire Nodes

Select the nodes in the distribution system to be modeled for a fire condition.

  • All - Runs a fire demand at each junction node in the distribution system. Nodes that have been removed with the Remove button will not be considered.

  • Domain - Only those nodes with a fire demand in the currently active domain will be evaluated during the Fire simulation. Edit Domain - Use this to create, modify and delete node elements to be included in a domain prior to a Fire simulation.

  • Selection - Only those nodes that have been graphically selected will be assigned a fire demand during the Fire simulation. Edit Selection - Select elements on screen.

Fire Flow Demand

Specify the fire flow demand to be analyzed at the junction nodes specified in the Fire Nodes section.

For example, a value of 500 will apply a fire flow demand of 500 gpm at each junction node assigned in the Fire Nodes section. Demands are evaluated one junction node at a time as seen in the Report section. It is important to note that any fire demands assigned via the main program will be disregarded during a Fire simulation.

Residual Pressure

The minimum residual pressure, usually 20 psi, targeted at each hydrant (junction node) in the modeled Fire Node set. You will calculate the maximum flow available at the hydrant while maintaining the user-specified residual pressure in the Protector. 

Accuracy

Convergence criterion used to signal that a solution has been found. Trials end when the sum of all flow changes divided by the sum of all link flows is less than this number.  Suggested value is 0.001.

Maximum Iteration

Specify the maximum number of trials used to solve the nonlinear equations that govern network hydraulics. Suggested starting value is 40.

Critical Node Searching Range

Use this to specify which nodes will be evaluated for minimum pressures during the Fire simulation. The options are fire nodes, entire network, or domain.

Select Time

Select a time from which to conduct an Fire simulation. The Fire simulation will run from hour 0:00 to the time specified with the Select Time dialog box. For example, if hour 13:00 is specified the Fire analysis will be run from hour 0:00 to 13:00 hours.

  • Select Time - The Select Time button will display the select time slider. Use the slider to select a time from which to conduct an Fire simulation.

  • Run - Use the Run button to run the Fire simulation.

  • Report - Displays the Fire Flow Report. 

  • Edit Facility - This button activates the Facility Manager dialog box which allows you select particular elements of the system to be removed from the Fire simulation. In most instances, you will select a facility that has already been created, via an Isolation or Breakdown simulation, by clicking on the adjacent drop-down box.

  • Reset Facility - Resets the active facility set back to its original state (the facilities that were active in the current scenario, prior to running the Protector).

Options - The Options button is used for assigning the GIS-based layer to be used for conducting a customer notification. Customer notification is not used for the Fire analysis. 

Reset Map - Click on this button to reset the Map display to its default state.

Close - Click Close to close the Protector dialog box. To conduct another water security analysis, simply click on another analysis tab in the Protector dialog box.