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Details on the Calculation Dialog for Gas

Information on the dialog LINEAR Analyse Gas.

The calculation dialog shows an overview of the detected pipe network and contains all commands necessary for the calculation.

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Project tabDiscipline GasPlanning typeAnalyse tabCalculation ...

Calculation dialog Analyse Linear AutoCAD

Commands for the calculation

The commands in the upper part of the calculation dialog pertain to the entire pipe network.

Element

Meaning

Systems

If the project contains several systems or partial networks you may determine which of the systems or partial network to display in the calculation dialog’s tables.

This button will open the technical data of the initial component. Here, you can change the system name shown in the drop-down list.

Calculate

Initiate the calculation of the pipe network after having made changes to see current calculation results. If you have activated the Recalculate after editing checkbox in the Settings dialog, the calculation is automatically performed again after each editing of section parts or components.

Visualization ...

This command displays properties and calculation results of the pipe network in color in the drawing.

Results ...

Displays additional information regarding the pipe network and an overview of the calculation results, which also are part of the printouts.

Reports ...

Displays an overview of notes, warnings and errors that occurred during calculation. You can recognize the type of report by the color of the button:

green check mark: No current notes, warnings or errors.

blue i There are notes on the calculation.

yellow warning triangle: There are warnings for the calculation.

red cross: There are errors in the calculation.

Note:

It is recommended to always carefully read the reports to correct errors in the drawing and ensure a proper calculation.

Labeling ...

Label components and section parts with calculation results.

Update <

If components or section parts have already been labeled and calculation results have changed retrospectively, this button will refresh all labels with current data.

Commands for the tables

Similar commands are available in the sections Flow paths, Section parts and Components.

Element

Description

Maximize list

The tables of flow paths, section parts and ventilation section parts can be enlarged over the entire calculation dialog. The other tables are hidden.

Minimize list

Reduces a maximized table. The other tables are displayed again.

Search <

The command is available in the sections Flow paths, Section parts and Components. After clicking Search < select the element in the drawing. The respective table then highlights the flow path, the section part or the component.

If a certain flow path number, a section part number or a component number needs to be found, enter the number into the text field and click Search <. The respective table then highlights the flow path, the section part or the component.

Show

The command is available in the sections Flow paths, Section parts and Components. First, select the element from the table and click Show. The flow path, the section part or the component is shown in the drawing.

Edit...

The command is available in the sections Flow paths, Section parts and Components. First, select the element in the table and click Edit.... The dialog for editing components or section parts is opened.

Edit <

The command is available in the Section part, and Components sections. After clicking edit in drawing <, select the element in the drawing. The dialog for editing components or section parts is opened.

Table for Flow paths

This table shows the calculation data for all flow paths of the selected system. It provides an overview over all ending components of the network. If you select a flow path, the table Section parts displays all corresponding section parts. The most unfavorable flow path is highlighted in a different color. You can also select the most unfavorable flow path by pressing U.

Column

Description

No.

Number of the flow path.

Consumer

Name of the consumer. The name can be modified in the table.

Q

Load by consumer.

Length

Length of the flow path.

Height

Height of the flow path.

dpCnt

Pressure loss due to meters.

dpTot

Sum of all individual pressure losses from pipes, built-in parts, appliances, valves.

dpH

Pressure loss due to changes in hydrostatic pressure (Uplift).

dpKin

Pressure change due to acceleration.

dpStat

Static pressure change measured from the flow path beginning (Pressure regulating device) to the consumer.

Table for section parts

This table shows the calculation data for all section parts of the selected flow path. If you select a section part, the table Components displays all corresponding components.

Unfix / fix section parts

This command allows you to fix or unfix the dimensions of all section parts. If values are displayed in bold in theDN column, the dimension of the respective section parts will not be adjusted during the calculation. This is sensible when calculating existing systems. If the dimensions of some section parts have been fixed already, you will be asked whether to fix or unfix all section parts.

Column

Description

No.

Number of the section part.

Type

Section part type:

DBP: Distribution pipe

CSP: Consumption pipe

BRP: Branch pipe

SFP: Single feed pipe

pB

Working pressure (static pressure).

DN

Nominal diameter of pipes in this section part. The nominal diameter can be changed in the table. The value is then fixed and will not be adjusted by the software during calculation. Fixed values are shown in bold.

L

Length of section part. The length be changed in the table. The new length will be distributed among all pipes of the section parts proportionately to constructed length. All pipes affected by the change in length will be displayed bold in the tables for section parts and components.

H

Height of section part.

Sum Q

Sum- or section load.

Q

Peak load.

w

Velocity.

R

Pipe friction pressure loss per meter.

Ltot(L+L(equiv.)

Additional length of section part.

R*Ltot

Total pressure loss from pipe friction.

dpApp

Pressure loss from appliances.

dpTot

Sum of all individual pressure losses from pipes, built-in parts, appliances, valves.

dpH

Hydrostatic pressure change (Uplift).

dpStat

Pressure change due to acceleration.

dpResid

Residual pressure at the end of the section part.

Table for components

The table shows the calculation data of all components contained in the selected section part.

Column

Description

No.

Component number.

Name

Name of the component.

DN

Dimension.

di1/di2

Pipe inside diameter for pipes (ÖVGW).

L

Length for pipes.

R

R-value of pipes.

L(equiv.)

Length equivalent for fittings.

R*Ltot

Total pressure loss from pipe friction.

w1/w2

Velocity relating to the pipe inside diameter d1/d2 (ÖVGW).

Re

Reynolds number (ÖVGW).

Sum zeta

Sum of resistance coefficients (ÖVGW).

dpP,F

Pressure loss from pipes and fittings (ÖVGW).

dpApp

Pressure loss from appliances.

dpTot

Total pressure loss.

Generating 3D pipes

Allows the assignment of pipe materials from the 3D Piping module after the calculation of a single-line pipe network. After successful assignment, a three-dimensional pipe network is generated. Pre-assigned insulation material is considered. This process requires a license for the LINEAR 3D Design Pipe&Power module.