Details on the Dimensioning Tab in the Potable Water Settings Dialog
Information on the Dimensioning tab in the Settings dialog in the discipline Potable water.
In this area, you define maximum velocities as limit values for dimensioning. The settings are saved with the project. Exceptions are noted accordingly.
Clicking on the unit of a velocity opens a context menu where you can adjust the unit used and the number of decimal places.
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Minimum flow pressure tolerance
Due to dimensioning during calculation, the network is throttled in such a way that minimum flow pressure is just about reached for all discharge valves. If you want to permit narrow undershoot of minimum flow pressure for selected discharge valves, enter a maximum value for the undershoot here.
Maximum Static Pressure
The value is preset to 5000 hPa and can be adjusted if necessary.
When exceeding the maximum static pressure, a message is issued in the report for sound protection reasons.
Maximum Volume of Hot Water without Circulation
Enter a limit value for the maximum volume of hot water pipes outside the circulation circuit. If during the calculation a larger volume is detected, a warning will be issued in the report.
Maximum Volume of Col Water for Single Connector Pipes
Enter a limit value for the maximum volume for cold water single connector pipes that connect consumer to the pipe network. If during the calculation a larger volume is detected, a warning will be issued in the report.
Estimated portion for fittings and joining pieces
Enter a percentage for the portion of fittings and joining pieces you want to be considered during calculation.
Maximum velocities
The maximum velocities are determined by the calculation basis. Maximum velocities are intended for the flow rates for the different sections of the potable water network. You can edit the values for your project.
House service connection pipe
Pipes from the drilling connection through to the main shut-off device (MSV).
Consumption pipes (Zeta < 2.5)
All remaining pipes in which a Zeta value is less than 2.5. Fittings will not be considered.
Consumption pipes
All remaining pipes in which a Zeta value is greater than or equal to 2.5. Fittings will not be considered.
Continuous supply pipelines
All pipes that serve a continuous consumer.
Flexible pipes
All pipes that have the material Flexible pipes from the pipe tables assigned to them.
Reset
Resets all flow velocities to the DIN values originally proposed by the program.
Velocity limits
When selecting the Russian potable water standard SP 30.13330.2020, you can additionally select the velocity limits based on sound levels according to the standard as a default for the pipe network calculation. Select the Velocity limits option to do this. By clicking the button, you open the dialog Velocity limits according to SP 30.13330.2020, where you will find an overview of the standard values.
Always dimension decreasingly
Enabled: A section part will always be either as large or smaller than the one preceding it (in direction of the tapping point).
Disabled: It may happen, that, during throttling the network by dimensioning pipes, a section part further away from the network starting point is dimensioned larger than the one preceding it.
Consider Internal Water Circulation
Enabled: Inliner circulating pipe is considered during dimensioning.
Dimensioning of closed circular pipe
Enabled: When dimensioning closed circular pipes, circular pipe closures are taken into account.
Consider flow type
This command is enabled if a flow divider is found in the potable water pipe network during the calculation.
Enabled: When dimensioning the closed circular pipe, a turbulent flow through is aimed at, in order to ensure hygienic operation. If, after dimensioning in the closed circular pipe, the nominal diameter is larger than the connection dimension of the flow divider, a corresponding message is displayed.
Disabled: When dimensioning the closed circular pipe, a turbulent flow through is not considered. An error message is displayed in the calculation if a closed circular pipe is flushed laminarly and thus hygienic requirements are not met. In such cases, turbulent flow can be achieved by manually adjusting the nominal diameters of the closed circular pipe.
Consider building curve
When you select a building type, you also select a building type-specific simultaneity (= building curve). Taking the building curve into account leads to more realistic results when determining volume flows.
Enabled: The peak volume flow in ring mains is determined taking into account the simultaneity specific to the building type.
Disabled: The peak volume flow is determined using the simultaneity approach of the active standard or, if available, taking into account the usage units.
Consider Usage Units
Enabled: Usage units that have been assigned to consumers in Usage units are considered during dimensioning.
Disabled: If you created usage units, you can exclude them from calculation without losing the assignment. You can compare calculation results with and without usage units. If you have created and assigned a usage unit but deactivated the checkbox Consider Usage Units, a note will be issued in the report. Calculation will be performed based on simultaneity curves in this case.
As part of the calculation bases SSP 30.13330.2016 and SP 30.13330.2020, it is necessary to define usage units in order to determine the number of users.
Zeta values based on manufacturer values
Enabled: If you use manufacturer pipe systems containing real, measured zeta values provided by the manufacturer, they will be used for calculation. If manufacturer zeta values are not available, norm zeta values are used.
Disabled: Norm zeta values are used during calculation regardless of the pipe system.