Details of ”Calculation Presettings "in the "Settings” (Gas)
Information about the Calculation Presettings section in the Settings dialog of the Pipe Network Calculation Gas.
In this dialog, you can make global settings for the calculation of gas pipe networks. The settings are saved with the project.
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Calculation Method
Select the desired calculation method from the drop-down list. Depending on the selected method, different settings are at your disposal.
Basic Conditions
Specifies the permissible pressure loss and permissible velocity. To change the permitted velocity, activate the checkbox.
Display Calculation Dialog
Define the units used to display the load, pressure loss, and individual resistance in the calculation dialog, in the results, and in the printouts.
Material Values
The gas type and its material values depend on the selected calculation method. The names of the material values are adjusted according to the selected method. When using Dimensioning acc. General Method the gas type can be chosen and by entering material values be freely defined. If you enter material values in this dialog, the input is saved with the project. If you create the new gas type in the dialog Material values, it will also be available for other projects.
| Element | Description |
|---|---|
| Name | The name can be customized for Dimensioning acc. To General Method and Dimensioning acc. to TRGI 2018. The input is saved with the project. |
 Material value table | Opens the Material Values dialog. With Dimensioning acc. General Method, and Dimensioning acc. to TRGI 2018 you can select the gas type in the dialog Material Values and create a new gas types. The values are saved in the table. |
| Net Calorific Value or Standard Calorific Value or Standard Heating Value | Net calorific value or standard calorific value or standard heating value of the selected gas type. When using the Dimensioning acc. to General Method and Dimensioning acc. to TRGI 2018, the value can be entered freely. The input is saved with the project. |
| Operating Density or Standard Density | Operating density or standard density of the selected gas type. When using the Dimensioning acc. to General Method and Dimensioning acc. to TRGI 2018, the value can be entered freely. The input is saved with the project. |
| kin. Operating viscosity or dyn. viscosity or kin. viscosity | Kinematic operating viscosity or dynamic viscosity or kinematic viscosity of the selected gas type. For Dimensioning acc. to General Method, Dimensioning acc. to TRF 1996, Dimensioning acc. to ÖVGW F G61 and Dimensioning acc. to TRGI 2018, the value can be entered freely. The input is saved with the project. |
Determination Pressure loss
Depending on the selected calculation method, different setting options are available in the Pressure Loss Calculation section.
| Element | Description |
|---|---|
| Zanke Prandtl-Colebrook Prandtl-Kármán Renouard | Select the method to determine pressure loss. |
| Consider hydrostatic pressure | Enabled: Pressure losses or pressure recoveries due to gravitational forces are also considered during dimensioning. If the gas used is lighter than air and the consumers are positioned higher than the house service connection, pressure recovery is possible and the pipes will be dimensioned smaller accordingly. If the gas used is heavier than air and the consumers are positioned higher than the house service connection, this height difference must be overcome additionally. |
| Consider acceleration | Enabled: Considers the dynamic pressure change per pipe section caused by changes of volume flow rates and dimensions over the course of a flow path. |
Simultaneity
The simultaneity of appliances in the flow paths can be calculated according to the rules of the respective dimensioning basis or according to a 100% approach.
| Element (depending on the selected dimensioning method) | Description |
|---|---|
| according to TRGI 2008/TRF 2012 according to TRGI 2018/TRF 2021 according to TRGI 2018 | Enabled: The simultaneity of appliances in the flow paths is automatically set according to the relevant TRGI/TRF rules. |
| 100 % approach / user defined 100% approach | Enabled: A simultaneity of 100 % is initially assumed for all consumers in flow paths. You can adjust the simultaneity of individual appliances in the technical data for the appliances. |
General Settings
The setting options described below are used, among other things, to optimize the processing time for large networks.
| Element | Description |
|---|---|
| Height above Sea Level Height above Adriatic Sea | Enter the height level of the building. In the Dimensioning in accordance with ÖVGW, the height above the Adriatic Sea is specified instead of the height above sea level. |
| Execute GEFV Balancing | Enabled: GEFV balancing is performed with each calculation. Disabled: The calculation is performed without GEFV balancing. If the selected design method requires balancing, a corresponding warning is issued in the calculation. |
| Without GEVF Checks, Commercial Use without GEFV testings | Enabled: Calculation is carried out without GEFV testings. When printing Basic conditions, a note is issued commenting on GEFV testings being deactivated. |
| Allow smaller nominal diameters before the pressure closed-loop controller | Enabled: When dimensioning, decreasing pressure is allowed downstream of pressure regulators. A smaller nominal diameter is permitted upstream of a pressure regulator without the nominal diameter being considered the maximum for the entire system. Disabled: All pipes are dimensioned decreasingly. |
Detect Material with Every Calculation | Enabled: Material for creating the parts list is detected with every calculation. Disabled: Material for creating the parts list is not detected with every calculation. For large project where changes in material are not to be expected, this can shorten calculation time. If the checkbox is unchecked and you want to create printouts using the Output ... function, you will be asked whether the material should be determined. |
| Recalculation after editing | Enabled: After editing pipe sections or components in the calculation dialog, the calculation will be carried out again. Disabled: Calculation results will be updated after clicking Calculate. |