Pressure Regulated outlets

[sisirrigation]

Hello,

I am a new IrriCAD user and I am currently working at customizing the database. As our field of expertise is mainly golf irrigation, 99% of the "outlets" we will be using are pressure regulated Valve-in-Head sprinklers with multiple nozzles available... The manual states that we should be creating the nozzles first and then the outlets (and assign the nozzles to the proper outlet) but there does not seem to be a way to create nozzles with a fixed radius regardless of pressure (as they are pressure regulated).

Do I need to create an outlet for each type of rotor/nozzle combination to go around this in IrriCAD?

How do you suggest I go about creating my outlets?

Also, having the option to create pressure regulated outlets may be someting to consider for a updated release.

Thanks for your help!

[Hutch]

Hi Serge

It is best to follow the process outlined in the manual. Create the nozzles first, then assign them to a sprinkler. A sprinkler normally has a range of nozzles so it is necessary to set the flow characteristics for the nozzles, not the sprinklers.

Hope this helps.

[sisirrigation]

OK. Am I correct in assuming that the "fit curve" feature is irrelevent when dealing with pressure regulated outlets? How do you suggest I enter the exact radius at fixed pressure? Or am I not understanding this curve fit tool correctly.

[Hutch]

When dealing with pressure regulated nozzles, IRRICAD assumes a constant flow regardless of upstream pressure. In the curve fitting utility, if you input a range of pressures and equal flow for all those pressures, the resulting constant will be the flow in liters per hour and the exponent will be zero.

Similarly for radius. If you enter a range of pressures and equal radius for all those pressures, the resulting constant will be the radius in meters and the exponent will be zero.

In these cases, you don't need to use the curve fitting utility, you can enter the values. Make sure that you enter the flow in liters per hour and radius in meters, regardless of the units that you use for design.