Calculate – Options

When you use the Calculate command then the calculate options dialogue window will open as below.

Design parameters

When you are designing a system based on design density the design parameter information will help you to ensure that you have the correct number of heads selected for the area of operation and provides the design density which you set the project data

If you have specified the head area for each head in the system when you added or edit the pipes in the system then the total head area will be added together for all the heads which you have selected and will be in operation. In the example below the design density has been set to 7.5mm/min in the project data and the area all the heads selected for this calculation is 261m²

Limits for warning messages

You can select the limits for warning messages for the calculation, there is no right and wrong criteria for these warnings and it will be dependent on the type of system you are designing, the design authority and your own requirements.

If you are designing a sprinkler system to EN 12845 you may wish to set the maximum velocity to 10 m/s as this is the maximum permitted velocity in any pipe in the system. In the example below as we have set the minimum velocity to -1m/s this ensures FHC will ignore any pipes with zero flow. The maximum velocity is set to 10 m/s and the maximum pressure drop is set to 3.00 bar. If any the the three warning limits are exceeded then FHC will show you a list of the pipe after the calculation has completed and the pipes will be shown in RED in the drawing view.

Water Supply

If you have added a water supply curve the name will displayed and when you calculate the system FHC will try balance to the curve. If 'None' is displayed then FHC will calculate the minimum pressure and flow requirements for the system based on the design perimeters set in Project Data the Heads codes and the area of coverage for the head.

Report Comment

The comments edit text box will display any comments which you have added in the project data and you can modify as you require. This information is provided on the final report

Allow FHC to find the MRH

The normal operation is to allow FHC to locate and find the most remote head in the system and you should normally leave this tick box selected.

	MRH not required

MRH Node number

Part Save

You can select and deselect the Part Save option. If it is selected then when the calculation has been completed you will be prompted to save the project with a new file name and only the heads which you are selected and calculated will be saved in the new project file. This is useful if you have a project with a large number of heads and you wish to save the operating heads such as the most remote area or the most favourable area. This makes it much easier to return to the calculations the heads already selected.

You can also use the Part Save button on the Calculate - Summary at the end of the calculation. The command is available to use after each calculation regardless to setting of the Part Save check-box. See Calculation - Summary -> Part Save for more information.

OK Button

Once you have reviewed the information in the calculations options press the OK button to start the calculation

	Cancel Button
	If you do not wish continue with the calculation press the cancel button

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Calculate – Options