Calculators in InfoSurge Pro

00:03

When working in InfoSurge Pro,

00:06

there are several calculator tools available for computing operational characteristics of various model elements.

00:14

From the InfoSurge toolbar, clicking the Auxiliary Calculator button expands a dropdown

00:20

with options to calculate values such as:

00:24

Wave speed for a pipe

00:26

Flow resistance for various situations

00:30

Pump inertia

00:32

There are also options that allow you to calculate pump characteristics, optimal valve stroke, and air slam pressure.

00:40

Note that the AV (TCV) calculator is separate from these options.

00:47

The Wave Speed Calculator helps you determine the propagation speed for pressure waves in pipes.

00:54

Note that the stiffer the pipe material used and the more the pipe is restrained,

00:60

the higher the wave propagation speeds.

01:03

The liquid flowing through pipes is generally set to water,

01:07

but properties such as pipe material, diameter, and thickness can vary within a model.

01:15

The Resistance Calculator allows you to calculate resistance from minor loss coefficients,

01:21

flow coefficients, and other factors like orifice data.

01:26

There are several specific types of resistance calculators available, each one suited for specific situations.

01:35

Most surge protection devices (SPDs) require a resistance value for them to function properly within your model.

01:44

The Pump Inertia/Pump File Calculator identifies which of the eight standard pump files are the most appropriate for a specific pump.

01:55

This option helps you calculate the most appropriate pump file

01:59

that accounts for unexpected operating conditions that can occur.

02:04

You can also use the Edit User Pump File option to specify two different pump files,

02:10

to customize an intermediate file based on the pump speed.

02:15

The data in the intermediate file is interpolated from the two files you choose and saved to your specified file.

02:24

The Pump File Characteristics Calculator helps you determine operating conditions for pumps described by a pump file,

02:33

based on the rated conditions—as well as the flow and speed—at which the pump is operating.

02:40

You can adjust pump data values, such as relative density of liquid and reference flow,

02:46

as well as head-torque characteristics.

02:50

The Flowrate option of the Valve Stroking Calculator allows you to determine the optimum 2-stage closure for a valve in a single pipeline.

03:00

Based on the pipeline properties and initial conditions, it calculates the optimal set of closing time and area ratio for the first stage,

03:11

as well as the corresponding velocity and head.

03:15

Note that if you are using the Flowrate option, first ensure that you have the measurement units set to match that of your data.

03:24

Pay close attention to the Total Time for Closure option,

03:28

as it is the value you will be editing the most.

03:32

You can adjust it until the value of Head after Stage-1 Closure reaches an acceptable level.

03:39

Another Valve Stroking option allows you to adjust Velocity,

03:44

but note that instead of assigning a Steady State Flowrate value,

03:48

you assign a Steady State Velocity value.

03:52

Again, you adjust the Total Time For Closure until the Head after Stage-1 Closure value is acceptable.

04:01

Once you have calculated the Stage-1 Closure Time and Cv Ratio For Stage-1 Closure,

04:08

you can use options found in the Active Valve Characteristics Curve Generator dialog to choose the appropriate valve type.

04:17

You can also use the valve curve to estimate the opening percentage for the Cv ratio for the stage-1 closure.

04:25

The Valve Modulating Calculator allows you to calculate the data needed to use an active valve

04:33

as a modulating regulating valve.

04:36

For normal applications, static active valves are assumed to maintain their initial settings during the transient analysis.

04:45

Note that in order to use this option properly,

04:48

you first need to perform two steady state runs with different conditions outside of a surge analysis

04:55

to identify the upstream and downstream head and flowrates.

05:01

The Air Slam Pressure Calculator helps estimate the surge pressure potential due to air expulsion from an air release

05:09

or vacuum release valve.

05:12

It calculates the pressure surge generated by the water column impact following the expulsion of air.

05:19

The Bladder Tank Precharge Calculator allows you to use the results obtained for a closed surge tank

05:26

to size a bladder tank and determine the required precharge pressure.

05:32

This bladder tank will provide the same results as a closed surge tank.

05:37

Note that the initial volume is input for the closed surge tank.

05:43

Then, the maximum volume is determined by the volume plot for the surge tank.

05:49

You will need to make sure the initial maximum volume has been reached.

05:54

The initial air pressure is computed by an initial steady state analysis.

06:00

The Active Valve Characteristics Curve Generator option

06:05

allows you to calculate the minor loss (or k-coefficient)

06:10

for a valve based on an input curve of the open area ratio versus the stem position.

06:18

The curve generator can be used to create a curve that describes the minor loss versus percent open characteristics of a typical valve.

06:28

It is recommended that you view the Autodesk online help for more information about surge calculators

06:35

to fully understand what their input and output fields do before using them.

Video transcript

00:03

When working in InfoSurge Pro,

00:06

there are several calculator tools available for computing operational characteristics of various model elements.

00:14

From the InfoSurge toolbar, clicking the Auxiliary Calculator button expands a dropdown

00:20

with options to calculate values such as:

00:24

Wave speed for a pipe

00:26

Flow resistance for various situations

00:30

Pump inertia

00:32

There are also options that allow you to calculate pump characteristics, optimal valve stroke, and air slam pressure.

00:40

Note that the AV (TCV) calculator is separate from these options.

00:47

The Wave Speed Calculator helps you determine the propagation speed for pressure waves in pipes.

00:54

Note that the stiffer the pipe material used and the more the pipe is restrained,

00:60

the higher the wave propagation speeds.

01:03

The liquid flowing through pipes is generally set to water,

01:07

but properties such as pipe material, diameter, and thickness can vary within a model.

01:15

The Resistance Calculator allows you to calculate resistance from minor loss coefficients,

01:21

flow coefficients, and other factors like orifice data.

01:26

There are several specific types of resistance calculators available, each one suited for specific situations.

01:35

Most surge protection devices (SPDs) require a resistance value for them to function properly within your model.

01:44

The Pump Inertia/Pump File Calculator identifies which of the eight standard pump files are the most appropriate for a specific pump.

01:55

This option helps you calculate the most appropriate pump file

01:59

that accounts for unexpected operating conditions that can occur.

02:04

You can also use the Edit User Pump File option to specify two different pump files,

02:10

to customize an intermediate file based on the pump speed.

02:15

The data in the intermediate file is interpolated from the two files you choose and saved to your specified file.

02:24

The Pump File Characteristics Calculator helps you determine operating conditions for pumps described by a pump file,

02:33

based on the rated conditions—as well as the flow and speed—at which the pump is operating.

02:40

You can adjust pump data values, such as relative density of liquid and reference flow,

02:46

as well as head-torque characteristics.

02:50

The Flowrate option of the Valve Stroking Calculator allows you to determine the optimum 2-stage closure for a valve in a single pipeline.

03:00

Based on the pipeline properties and initial conditions, it calculates the optimal set of closing time and area ratio for the first stage,

03:11

as well as the corresponding velocity and head.

03:15

Note that if you are using the Flowrate option, first ensure that you have the measurement units set to match that of your data.

03:24

Pay close attention to the Total Time for Closure option,

03:28

as it is the value you will be editing the most.

03:32

You can adjust it until the value of Head after Stage-1 Closure reaches an acceptable level.

03:39

Another Valve Stroking option allows you to adjust Velocity,

03:44

but note that instead of assigning a Steady State Flowrate value,

03:48

you assign a Steady State Velocity value.

03:52

Again, you adjust the Total Time For Closure until the Head after Stage-1 Closure value is acceptable.

04:01

Once you have calculated the Stage-1 Closure Time and Cv Ratio For Stage-1 Closure,

04:08

you can use options found in the Active Valve Characteristics Curve Generator dialog to choose the appropriate valve type.

04:17

You can also use the valve curve to estimate the opening percentage for the Cv ratio for the stage-1 closure.

04:25

The Valve Modulating Calculator allows you to calculate the data needed to use an active valve

04:33

as a modulating regulating valve.

04:36

For normal applications, static active valves are assumed to maintain their initial settings during the transient analysis.

04:45

Note that in order to use this option properly,

04:48

you first need to perform two steady state runs with different conditions outside of a surge analysis

04:55

to identify the upstream and downstream head and flowrates.

05:01

The Air Slam Pressure Calculator helps estimate the surge pressure potential due to air expulsion from an air release

05:09

or vacuum release valve.

05:12

It calculates the pressure surge generated by the water column impact following the expulsion of air.

05:19

The Bladder Tank Precharge Calculator allows you to use the results obtained for a closed surge tank

05:26

to size a bladder tank and determine the required precharge pressure.

05:32

This bladder tank will provide the same results as a closed surge tank.

05:37

Note that the initial volume is input for the closed surge tank.

05:43

Then, the maximum volume is determined by the volume plot for the surge tank.

05:49

You will need to make sure the initial maximum volume has been reached.

05:54

The initial air pressure is computed by an initial steady state analysis.

06:00

The Active Valve Characteristics Curve Generator option

06:05

allows you to calculate the minor loss (or k-coefficient)

06:10

for a valve based on an input curve of the open area ratio versus the stem position.

06:18

The curve generator can be used to create a curve that describes the minor loss versus percent open characteristics of a typical valve.

06:28

It is recommended that you view the Autodesk online help for more information about surge calculators

06:35

to fully understand what their input and output fields do before using them.

Video quiz

Required for course completion

When using the Flowrate option of the Valve Stroking Calculator, which value do you edit the most?

(Select one)
Select an answer

1/1 questions left unanswered

When working in InfoSurge Pro, there are several calculator tools available for computing operational characteristics of various model elements.

From the Model Explorer, InfoSurge toolbar, expand the Auxiliary Calculator drop-down for options:

Identify Auxiliary Calculator drop-down selected from the Model Explorer toolbar.

Note that the AV (TCV) calculator is separate from these options.

Wave Speed Calculator:

Select Wave Speed to open.

In the InfoSurge Calculator dialog box, settings for the selected Wave Speed Calculator.

Helps determine propagation speed for pressure waves in pipes.

Note that the stiffer the pipe material used and the more the pipe is restrained, the higher the wave propagation speeds.

Liquid flowing through pipes is generally set to water, but properties such as pipe material, diameter, and thickness can vary within a model.

Resistance Calculator:

Click Resistance to open.

In the InfoSurge Calculator dialog box, settings for the selected Resistance Calculator.

Calculates resistance from minor loss coefficients, flow coefficients, and other factors like orifice data.

Several types of resistance calculators available, each for specific situations.

Most surge protection devices (SPDs) require resistance value to function properly within model.

Pump Inertia/Pump File Calculator:

Click Pump Inertia to open.

In the InfoSurge Calculator dialog box, settings for the selected Pump Inertia/Pump File Calculator.

Identifies which of eight standard pump files are most appropriate for specific pump.

Helps calculate most appropriate pump file that accounts for unexpected operating conditions.

Select Edit User Pump File to specify two different pump files, to customize an intermediate file based on pump speed—data in intermediate file is interpolated from two files chosen and saved to specified file.

In the InfoSurge Calculator dialog box, settings for the selected Edit User Pump File tab.

Pump File Characteristics Calculator:

Click Pump File Characteristics.

In the InfoSurge Calculator dialog box, settings for the selected Pump File Characteristics Calculator.

Helps determine operating conditions for pumps described by pump file, based on rated conditions—as well as flow and speed—at which pump is operating.

Adjust pump data values, such as relative density of liquid and reference flow, as well as head-torque characteristics.

Valve Stroking Calculator (Flowrate):

Click Valve Stroking and use the Flowrate option to determine optimum 2-stage closure for a valve in a single pipeline.

In the InfoSurge Calculator dialog box, settings for the selected Valve Stroking Calculator.

Based on pipeline properties and initial conditions, it calculates optimal set of closing time and area ratio for first stage, as well as corresponding velocity and head.

First, ensure that measurement units are set to match the data.

Pay close attention to Total Time for Closure, as it is the most-edited value—adjust until value of Head after Stage-1 Closure reaches acceptable level.

Valve Stroking Calculator (Velocity):

Click Valve Stroking and select the Velocity option to assign Steady State Velocity instead of Steady State Flowrate.

Again, adjust Total Time For Closure until Head after Stage-1 Closure value is acceptable.

Once Stage-1 Closure Time and Cv Ratio For Stage-1 Closure are calculated, use options in the Active Valve Characteristics Curve Generator to choose appropriate valve type.

Use valve curve to estimate opening percentage for Cv ratio for stage-1 closure.

Valve Modulating Calculator.:

Click Valve Modulating to open the Valve Modulating Calculator.

In the InfoSurge Calculator dialog box, settings for the selected Valve Modulating Calculator.

Calculates data needed to use an active valve as a modulating regulating valve.

For normal applications, static active valves are assumed to maintain initial settings during transient analysis.

To use properly, first perform two steady state runs with different conditions outside of a surge analysis to identify upstream and downstream head and flowrates.

Air Slam Pressure Calculator:

Click Air Slam Pressure to open.

In the InfoSurge Calculator dialog box, settings for the selected Air Slam Pressure Calculator.

Helps estimate surge pressure potential due to air expulsion from air release or vacuum release valve.

Calculates pressure surge generated by water column impact following expulsion of air.

Bladder Tank Precharge Calculator:

Click Bladder Precharge to open.

In the InfoSurge Calculator dialog box, settings for the selected Bladder Tank Precharge Calculator.

Can use results obtained for a closed surge tank to size a bladder tank and determine required precharge pressure—this bladder tank will provide same results as closed surge tank.

Note that initial volume is input for closed surge tank, and then maximum volume is determined by volume plot for surge tank.

Make sure initial maximum volume has been reached.

Initial air pressure is computed by an initial steady state analysis.

Active Valve Characteristics Curve Generator:

Click AV Characteristics Curve Generator to open.

In the InfoSurge Calculator dialog box, settings for the selected Active Valve Characteristics Curve Generator.

Calculates minor loss (or k-coefficient) for a valve based on input curve of open area ratio versus stem position.

Curve generator can be used to create a curve that describes minor loss versus percent open characteristics of a typical valve.

Refer to Autodesk InfoSurge Help topic, Surge Calculators for more information on surge calculators and their input and output fields.

 

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