Design Area

FHC Project Data : Design area

The Project data : design tab provides information about the FHC project. The information entered is displayed on the Hydraulic Calculation Report and most critical item is Design Density in mm/min which must be completed if you require FHC to calculate the design density of each head in the systems. You must also specify the head area in m² for each head which is require in the calculation this information can by entered when you Add a pipe a specify the head or you can Edit a pipe and add the information.

Only the design density (mm/min) is used in FHC for the calculate all other fields are for reference.

	Design area reference information
	Area reference, installation number and hazard classification are all reference information which you can supply and will be printed on your final calculation report. This information will not effect the calculation.

Options

When you press the options button you will see a dialogue box appear as shown below this has a number of options which you can select:

Stop checking the fitting errors: FHC will normally check that you are correctly specified Tees and elbows but in some instances you may have special fittings which do not comply with this standard by selecting this option FHC will no longer provide checking the correct fittings.

Allow extended coverage heads: FHC will provide a warning if the area specified from the head is greater in 31m² this option will disable the warning.

Allow heads on larger pipes: FHC will normally provide warning if you have a's head on a pipe larger than XXX, this will disable the warning.

Draw heads as pendent: FHC will always draw the heads up right but if you wish it can display them pendent by using this option. Hydraulically it does not make any difference to the calculation on how they are represented.

Don't calculate 4 MRH: Some design standards (EN 12845) require the average design density of four sprinklers and FHC will make a attempt to automatically determine the four sprinkler and calculate the average design density and this works very well in large symmetrical arrays. This command will switch off the automatic calculation of the four sprinkler, just insure that all the sprinkler are providing the minimum design density.

Once you have selected the options press the Apply button you will see that command line options are inserted at the front of the installation number.

	Density of coverage / Design Density
	You can specify the design density for the FHC project (if required) in mm/min (L/min/m²) and this value will be used as the default throughout the project unless you are specified a different value for an individual head in the Add or Edit pipe command. For FHC to calculate the correct design density for each head in the systems you must also specify the area each head is covering in m² which you can enter when you Add or Edit a pipe.

	Design area
	You can specify the design area in m² and although this is not used in the calculation it is displayed in a number of areas such as when you selecting the heads to calculate and on the FHC calculation report.

Drawing number

You can add additional text information in the 'Drawing number(s) text box to help identify drawings and documents which may be helpful to cross reference when reading the hydraulic calculation report.

Issue

If the 'Issue number / date text' box has not been completed and you please the 'Issue' button FHC will promote provide you with a suggested issue number and today's date. Once you have used this option each time you use the Issue button it will update the issue number and date of issue.

If you do not wish to use this option you can just overwrite the text in the text and if its not in a similar format the Issue button will not respond. If you later wish to use the Issue just clear the text from the issue text box.

	Comments
	You can add a short comment in the comment text box which will be show on the Hydraulic Calculation Report.

FHC - Reference & Tutorial | Version 2.4

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Design Area

Density of coverage / Design Density