Presentation Flarenet

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2What is FLARENET?What is FLARENET?

The design of flare and vent system piping is an important part of the overall system design for any chemical process. Traditional methods for the design of these flare and vent systems are often reliant upon the experience of the engineer. He or she must make a number of decisions in order to try to reduce the number of relief scenarios for evaluation based upon tight project deadlines. Failure to evaluate a single scenario due to "a lack of time" in the project design phase can have catastrophic penaltiesonce the process is in operation.

FLARENET has been designed to facilitate the design and rating of flare and vent system piping throughout the entire design process. The program interface uses a flow diagram for direct visualisation of the piping network. This is supported by detailed tables of all pertinent data and calculated results.

FLARENET can model the piping system topologies most commonly found in flare systems.

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3Component MangerComponent Manger

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4Component MangerComponent Manger

Path: Build menuPath: Build menu-->Components>ComponentsComponent Types

You may filter the list of available components to include only those belonging to a specific family. The All and None buttons turn all of the filters on and off, respectively, while the Invert button toggles the status of each check box individually.

Component ListYou can navigate through the database component list using: Arrow, PageUp/PageDown and Home/End keys Scroll Bar The Selection Filter The cell accepts keyboard input, and is used to locate the

component(s) in the current list that best matches your input. You may use wildcard characters as follows:

? - Represents a single character. * - Represents a group of characters of undefined length.Any filter string has an implied * character at the end.Add a ComponentTo add a component, you must first highlight it (by moving through the list until that component

is highlighted), then transfer it by double-clicking on it or selecting the Add button.

5Add Hypothetical Component/Edit Component ViewAdd Hypothetical Component/Edit Component View

On clicking either the Hypothetical button or the Edit button the Component Editor view opens up (identification, critical properties, other properties). This view is similar between adding a new hypothetical component and editing an existing component.

Sorting the Component ListPressing the Sort button allows you to select the sort option for components: name,

molecular weight, normal boiling point and group

Swapping two componentsSelect the first component in the Selected Component list by clicking on it. Then select

the second component either using the Shift key if the two are in sequence or pressing the Ctrl key and then clicking on the component. Swap the two componentsby pressing the Swap button.

Changing the ComponentsYou can switch the components in the Selected Component list with the ones in the

Database list while maintaining the source mole fractions. Select the components in both the Selected Components and the Database lists. Press the Change button to switch the two components.

6Pipe ManagerPipe Manager


7Pipe ManagerPipe Manager

Path: Build menuPath: Build menu-->Pipes>Pipes

Button DescriptionAdd Select this button to add a new pipe segment in the list.Edit Edit the currently highlighted pipe segment by opening the

Pipe Editor view where you can set the pipe parameters (connections, dimensions, fittings, heat transfer parametersand calculation methods).

Delete Remove the currently highlighted pipe segment. Sort Sort the Pipes list according to alphabetically descending

order or by location.Up and Down Arrow Move the highlighted pipe up and down the list.Swap Swap the two selected pipes in the Pipes list.OK Close the Pipe Manager view.


8Scenario ManagerScenario Manager

Path: Build menuPath: Build menu-->Scenarios>Scenarios

A scenario defines a set of source conditions (flows, compositions, pressures and temperatures) for the entire network. The design of a typical flare header system will be comprised of many scenarios for each of which the header system must have adequate hydraulic capacity. Typical scenarios might correspond to:

Plantwide power failure. Plantwide cooling medium or instrument air failure. Localized control valve failure. Localized fire or Depressurization.The scenario management features within FLARENET allow you to simultaneously design and rate the header system for all of the possible

relief scenarios.The Scenario Manager view displays all Scenarios in the case, and indicates the Current Scenario. Several buttons are available:

Button DescriptionAdd Adds a new scenario and opens the Scenario Editor view where you can set the scenario parameters (general,

headers, tailpipes and sources).Edit Edits the highlighted scenario and opens the Scenario Editor view where you can set thescenario parameters (general,

headers, tailpipes and sources).Delete Removes the currently highlighted scenario (note that there must always be at least one scenario in the case).Sort Arrange the scenario list alphabetically in descending order.Up and Down Arrow Move the highlighted scenario up and down the Scenario list.Swap Swap the two selected scenarios in the list.Current To make a scenario the current one, highlight the appropriate scenario, and then click on theCurrent button.OK Closes the Scenario Manager view.

9Node ManagerNode Manager

Path: Build menuPath: Build menu-->Nodes>Nodes

Button DescriptionAdd You will be prompted to select the type of node. This new

node will be named with a number depending upon the number of nodes already added.

Edit Allows you to edit the currently highlighted node. The form varies, depending on the type of node.

Delete Allows you to remove the currently highlighted node.Sort Sort the node list according to alphabetically descending

order either by name or location or type of node.Up and Down Arrow Move the highlighted pipe up and down the list.Swap Swap the two selected pipes in the Pipes list.OK Closes the view.


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Flare Tip ConnectionsFlare Tip Connections

Path: Build menuPath: Build menu-->Nodes>Nodes-->Add/Edit Button>Add/Edit Button-->Tip>Tip-->Connections tab>Connections tab

Field DescriptionName The alphanumeric description of the node (e.g. - HP

Flare Tip).Location You may wish to specify the location of the node in the plant.

Note that the location can have an alphanumeric name. This feature is useful for large flowsheets; you can provide a different locationname to different sections to make it more comprehensible.

Inlet Either type in the name of the pipe segment or select from the drop down menu.

At You can specify the end of the pipe segment attached with the flare tip.

To ignore the flare tip node during calculations, select the Ignore check box. Flarenet will completely disregard the node until you restore it to an active state by clearing the check box.


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Flare Tip CalculationsFlare Tip Calculations

Path: Build menuPath: Build menu-->Nodes>Nodes-->Add/Edit Button>Add/Edit Button-->Tip>Tip-->Calculations tab>Calculations tab

Field DescriptionDiameter You can specify a diameter for the tip. The default value

is 1000 mm. Valid values are between 0 and 1000 mm.Fitting Loss Fitting loss will be used to correct the sizing for the tip.

Select the Use Curve check box to enter a vendor-supplied data for the pressure drop through a flare tip, which often take the form of a curve. It gives the pressure drop versus the mass flowrate for a fluid with defined molecular weight and temperature and uses linear interpolation. To add a new data point, press the Add button and to delete an existing data point press the Delete button. You can provide upto 10 data points.


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ConnectorConnector CalculationsCalculations


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ConnectorConnector CalculationsCalculations

Path: Build menuPath: Build menu-->Nodes>Nodes-->Add/Edit Button>Add/Edit Button-->Connector>Connector-->Calculations tab>Calculations tab

Field DescriptionTheta Specify the connector expansion angle. If not

defined, it will be calculated from length.Length Enter the connector length. If not defined, it

will be calculated from theta.Fitting Loss Method The available options are: Calculated - The fitting loss willl be calculated based on

upstream/downstream pipesizes. Ignored - Flarenet will not calculate the fitting loss if this is

selected.


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TeeTee CalculationsCalculations


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TeeTee CalculationsCalculations

Path: Build menuPath: Build menu-->Nodes>Nodes-->Add/Edit Button>Add/Edit Button-->Tee>Tee-->Calculations tab>Calculations tab

Field DescriptionTheta Specify the connector expansion. This will be zero if

used between pipes with the same diameter.Fitting Loss Method The available options are: Ignored - Flarenet would not calculate the fitting loss if this option

is selected. Simple - It uses a constant flow ratio independent K factor for the

loss through the branch and run. Miller - This method uses a K factor which is interpolated using

Miller Curves, which are functions of the flow and area ratiosof the branch to the total flow as well as the branch angle.


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ReliefRelief ValveValve ConditionsConditions


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Path: Build menuPath: Build menu-->Nodes>Nodes-->Add/Edit Button>Add/Edit Button-->Relief Valve>Relief Valve-->Conditions tab>Conditions tab

Field DescrptionMAWP The Maximum Allowable Working Pressure (MAWP) is the maximum gauge

pressure permissible in a vessel at its operating temperature. It is normallyequal to the relief valve set pressure unless you have a low pressure vessel.

Contingency In general there are two types of process upset conditions:Fire - The relieving pressure is 121% of MAWP.Operating - The relieving pressure is 110% of MAWP.

Some of the operating upset examples are cooling failure, power failure and instrument air failure.Relieving Pressure The Relieving Pessure is equal to the valve set pressure plus the overpressure.

You can either enter the value or have it calculated using the MAWP and the Contingency by pressing the Set button. If you entered a value less than the MAWP, a warning message will be generated. Valid values are between 0.01 and 600 bar.

Inlet Temp Spec. The temperature specification of the source on the upstream side of the relief valve. Valid values are between 250C and 1500C.You can select the fluid condition from the drop down box on the ledft side. The available option are:

Actual - it uses the given inlet temperature as the actual fluid temperature. Subcool - If this option is selected, enter the amount of subcooling Superheat - If this option is selected, enter the amount of superheat.

Contingency

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Path: Build menuPath: Build menu-->Nodes>Nodes-->Add/Edit Button>Add/Edit Button-->Relief Valve>Relief Valve-->Conditions tab>Conditions tab

Field DescrptionAllowable Back Pressure The Allowed Back Pressure is the pressure that is allowed

to exist at the outlet of a pressure relief device as a result of the pressure in the discharge system. It is the sum of the superimposed and built-up back pressure. Pressing the Setbutton calculates the Allowable Back Pressure as a functionof the valve type as defined on the Dimension tab. Valid values are between 0.01 to 600 bar.

Outlet Temperature This is the temperature of the source on the downstream side of the valve.If the enthalpy method chosen is the Ideal Gas model, then this temperature is used to determine the enthalpy of the source at the entrance to the pipe network, otherwise this enthalpy is calculated by isenthalpic flash from the upstream pressure and temperature. Valid values are between 250C and 1500C.

Mass Flow It is the mass flow of the source. Valid values are between 0 and 100,000,000kg/hr.

Rated Flow It is the rated mass flow of the source. This is the sized or allowable flowrate. Valid values are between 0 and 100,000,000 kg/hr.


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ReliefRelief ValveValve CompositionComposition

Path: Build menuPath: Build menu-->Nodes>Nodes-->Add/Edit Button>Add/Edit Button-->Relief Valve>Relief Valve-->Compositions tab>Compositions tab

Field DescriptionBasis The composition basis, which may be either Mol. Wt., Mole Fraction or Mass Fraction.Mol. Wt. The molecular weight of the fluid. You can only enter data here if the composition basis

selected is Molecular Weight. Valid values are between 2 and 500.If the composition basis selected is Mole Fractions, the molecular weight is updated when you enter or change the component fractions.

Fluid Type If Molecular Weight is selected in the composition basis drop down box, you need to select the Fluid Type to calculate a binary composition in order to match the molecular weight. If the two components of the specified fluid type are not found then the other components are used.

Component Fractions The fluid composition in either mole or mass fractions. You can only enter data here if the composition basis selected is Mole Fractions.When you exit the Source view, you will be prompted about an Invalid Composition if the sum of these fractions is not equal to one. You can normalized the composition either manually editing the component fractions or by pressing the Normalize button.If the composition basis selected is Molecular Weight, the component fractions are re-estimated when you change the molecular weight.


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ReliefRelief ValveValve DimensionsDimensions

Path: Build menuPath: Build menu-->Nodes>Nodes-->Add/Edit Button>Add/Edit Button-->Relief Valve>Relief Valve-->Dimensions tab>Dimensions tab

Field DescriptionFlange Diameter The diameter of the valve discharge flange.Number of Valves Specify the number of valves for the source. Valid values

are between 1 and 10.Orifice Area Per Valve You can either enter it manually or press the Lookup button

and select from the Orifice Selection view. Valid values are between 0 and 100,000,000 mm2.

Valve Type The choices are: Balanced - A spring loaded pressure relief valve that incorporates a means for

minimizing the effect of back pressure on the performance characteristics. Conventional - A spring loaded pressure relief valve whose performance

characteristics are directly affected by changes in the back pressure on the valve.


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ReliefRelief ValveValve CalculationCalculation MethodsMethods

Path: Build menuPath: Build menu-->Nodes>Nodes-->Add/Edit Button>Add/Edit Button-->Relief Valve>Relief Valve-->Methods tab>Methods tab

Fields DescriptionFitting Loss Method The Fitting Loss drop down menu have the following two options

available: Ignored - If this option is selected, the fitting losses for the relief valve would not be calculated. Calculated - The fitting losses for the source will be calculated.VLE Method The options for the Vapour-Liquid Equilibrium calculations are as follows (see

Appendix A - Theoretical Basis for more details): Compressible Gas - Real Gas relationship. Peng Robinson - Peng Robinson Equation of State Soave Redlich Kwong - Soave Redlich Kwong Equation of State. Vapour Pressure - Vapour Pressure method as described in API Technical Data Book - Volume 1. Model Default - If this is selected, the Default method for the VLE method (as defined on the

Options view) will be used.Sizing Method The two Sizing Method available are: API - American Petroleum Institute HEM - Homogeneous Equilibrium Model

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