flaretot - total flare analysis

7/22/2019 FlareTot - Total Flare Analysis

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2014 Flaretot Ltd

The Flaretot program is designed to solve flare network problems, either for new network design, revamp and horizontal /vertical auditing.

A rigorous approach to Flare problems is used to endeavour to get the most accurate solution possible, while use of inbuilt data source, an integrated physical property simulator and clear interfaces all help to minimise setup time. Designscan be comparatively accurate from an early stage in the project, thus reducing redesign throughout project life.

Use of transparent (detailed) reporting and support for simultaneous solution using different methods is used throughoutsince we believe this helps checking and reduce unsuitable design by poorly chosen input data.

Comprehensive help files and standalone tutorials are provided to help reduce user training requirements.

We are also constantly striving to improve Flaretot by adding functionality and improving methods, and these updates areprovided without charge during the licence period.


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HYDRAULIC NETWORK ANALYSIS AND INTERFACE

At the core of Flaretot, is a windows style graphic interface where the piping network is defined. The data defined insources and resulting from the hydraulic analysis is linked to many of the modules in Flaretot.

In addition, if flare network analysis is not required, but rather flare property related modules, like radiation or dispersion,it is equally as easy to set up a simple system to define the flare properties.

It addresses all possible conditions of flow likely in flare networks, (compressible, two-phase flashing flow & potential forsonic conditions at pipe exits).

Easy to use interface

Windows style graphic interface is designed to reduceuser learning curve.

Network is fast to set up using drag and dropfunctionality with on screen connectivity. The drawingspace is not constrained, so that even large complicatednetworks can be modelled.

The interface supports quick header building and fullcopy and paste functionality.

Move seamlessly to Flaretot - Import and exportdata

Piping network models can be imported and exported toFlarenet.

Stream and component data from process simulators(currently Hysys and ProII) can easily be importedand mapped to source / cases in the Flare pipingnetwork.

User input is minimised as component mapping isautomated to aliases used in the simulators and sourcemapping is automatic if equivalent stream / sourcenames are used. Full user override control is provided.Data clarity helps reach a solution faster

A full piping network property summary with pipe sizingcriteria can be viewed and exported to spreadsheetformat.

Flowrate, pressure,temperature and Machnumber data is provideddirectly on the interfacedrawing to help identifybottlenecks in the system.

Colour coding also givesadditional feedback forexample for undefinedunits.

Customisable engineering units

Reduce data conversion errors with fully customisable engineering units. Units can be changed at any time so thatdifferent in-house and client units can be seamlessly used.


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CASE MANAGEMENT

Source cases

Cases in sources provide data for hydraulic analysis anddevice sizing. An unlimited number can be created.

Network cases

Network cases map source cases to a given overall plantscenario. An unlimited number can be created.

Use grid based source to network case mapping

Active source cases in each network case are easilydefined in the case manager grid.

When a network case isactive, non-contributingsources are greyed out onthe network drawing.

PIPE SIZING AND CLASSES

Size piping using sizing criteria

Piping can be automatically sized using any combinationof maximum velocity, mach number, Density x Velocity2and maximum pressure.

Piping is selected from network classes

Both user and automatic pipe selection is based onclasses defined in the network so that data does not haveto be input from piping class tables. Classes can alwaysbe overridden for cases where final project classes do notexactly match.

Piping class definitions reduce data input

Network piping classes use design temperature /pressure conditions, material and other piping designparameters such as weld type etc. to allow selection ofsuitable pipe for given nominal bores.

Typically these should closely match final projectspecifications. This ensures preliminary design canproceed with close to final design pipe sizes even thoughpiping classes may not be available until the project iswell under way.

PHYSICAL PROPERTIES

Flaretot has a built in physical property calculator with 310library components. Library components can be locatedeasily using name/synonyms, formula or CAS number.

The Peng-Robinson EOS and Lee Kesler methods forenthalpy are used for flash and fluid properties.

Petroleum fractions and components not in the library canbe defined as user components using the flexible usercomponent designer, which supports both Petro and Jobackgroup contribution methods. The Joback group contributionmethod is presented in a clear diagrammatic form.

Liquid temperature dependent properties can be calibratedwith known data. Feedback on predicted property data ispresented in chart form.


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THE FLARETOT CALCULATION MODULES


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FLARE RADIATION MODULE

Calculates combined radiation for multiple flares

Radiation is calculated at user specified points for all or selectedflares.

Data is linked to network

Flare data for radiation calculations is derived from the flarenetwork, so no further data entry is required.

Uses detailed flame shape modelsVarious 3D multi-point flame shape and length models with upto 100 points ensure the highest level of accuracy.

Uses detailed flame radiation models

The mixed IMS model allows any combination of traditionalopaque IDS or transparent IPS models to be used for radiationprediction.

Several methods for heat fraction radiated are provided, withvelocity and molecular weight correction.

Size the stack based on maximum radiationrequirements.

Generate contour plots

Generate plan and side view (from 2 directions)contour plots.

Overlay the plots onto scaled images such as plotplans.

FLARE STACK DISPERSION MODULE

Calculates combined pollutant for multiple flares

Uses gaussian model to calculate pollutant levels at userspecified points can be calculated for all or selected flares, withany combination of flared or flame out conditions. Data isderived from the flare network as in the radiation module.

Detailed plume shape calculation

The briggs equation models plume shape for both hot bouyantand cold jet plumes.

Covers a range of meteorological conditions

A range of dispersion coefficients are included coveringatmospheric stability, and rural/urban conditions. Wind speed iscorrected for height and conditions.

Includes sampling time basis

The sampling time basis for concentration values can bechanged to a user value.

Combustion calculated automatically.

The concentration of combustion product pollutants iscalculated automatically as well as combustion temperature.


Generate plan and side view contour plots showingplume and stack, and overlay on scaled images.


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FLARE NOISE MODULE

Calculate combined noise from multiple flares

Sound pressure levels at user specified points can be calculatedfor all or selected flares. Data is derived from the flare networkas in the radiation module.

Uses custom or standard noise spectrum


Generate plan and side view contour plots andoverlay on scaled images such as terrain maps.

Actual flare frequency spectrums can

be supplied or a typical built inprofile can be used.

Calculates atmospheric attenuation

Calculates attenuation by frequency to ISO9613 standard.

Reports A or C weighted sound pressure levels.

SHIELDING MODULE

Supports user or water shields

Define user (usually mesh type) or water spray shields. Attenuation for water shields canbe based on flare combustion temperature.

Define shield shape from sections

Define the shield shape from sections of rectangles, circles and polygons, and rotate into3D space for actual shield position.

Included in radiation and flare noise calculations modules

Both attenuation of radiation and noise (by frequency) is modelled.

VESSEL DEPRESSURISATION MODULE

Rigorous calculations

The blowdown module uses a rigorous componentproperty and phase model combined with unsteady statewall and insulation heat conduction to predict conditionsduring vessel depressurising. Blowdown of vertical,horizontal and spherical vessels can be modelled.Rigorous restriction orifice flowrate calculations are usedrather than generic pressure / flowrate equations so thatsimulated conditions are as realistic as possible.

Model both fire and normal blowdown

Wall property library data provided

A small library of metal and wall temperature dependentproperties for the metal wall and insulation is provided tominimise data input required.

Solution feedback provided in chart form

Extensive feedback on the blowdown calculation is givenin chart form to aid in reaching a viable solution with aminimum of complete and possibly unfeasible runs.

Includes wall stress analysis

Metal wall stress calculations are included to allow arealistic assessment of possible wall rupture duringblowdown.

Calculated stress during blowdown is overlaid on thematerial allowable stress chart, so it is clear whereallowable stress may be exceeded.

A library of allowable stress for various materials underASME VIII Sect 1 is provided.


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STRUCTURAL STEEL TEMPERATURE RISE MODULE

Calculates transient temperature rise

Predicts tubular metal element temperature rise with timeresulting from flare radiation.

Rigorous modelling

Uses a detailed 4 quadrant model with radiation and re-

radiation, conduction and convection taken into account.Convection coefficients for heat transfer to air arecalculated internally.

RELIEF VALVE SIZING MODULE

Create stand alone or network linked calculations

Rigorous sizing for all flow conditions

Size to API520 and rigorous DIERS method.

Unlimited sizing cases

Use any number of sizing cases, which can also be linkedto relief load calculations.

Supports ASME VIII and BS5500

Use ASMEVIII multiple or supplemental fire valves.Automatic valve selection based on API526

Includes excess area minimisation analysis.

Create API style or custom data sheets

Rigorous piping installation analysis

Analyse the inlet / outlet pipingand fittings in detail by definingthe installation from pipingelements and using rigorous

pressure drop methods includingDIERS and Beggs Brill. Createpressure profiles.

RUPTURE DISK SIZING MODULE

Create stand alone or network linked calculations

Unlimited sizing cases

Size using Kd or Kr methods

Supports coefficient of discharge and flow resistancemethods.

Size to API and rigorous DIERS methodsDetailed piping installation analysis

Kr method uses the same approach as relief valve pipinganalysis, rather than a lumped K value.

View pressure profile for Kr sizing.

RELIEF LOADS

Link relief load calculations to casesRelief load calculations are included in the case list fornetwork sources, and device sizing calculations (reliefvalves & rupture disks). The sizing results from thecalculation provide the case data.

All calculation properties are component based

Fire relief load

The fire relief load supports vertical, horizontal andspherical vessel types.

Connected piping and equipment is included Takes into account partial fire exposure and insulation Uses API521 methods or heat transfer model.Tube rupture relief load Includes rigorous DIERS method to cater for 2 phase,

flashing liquid and retrograde condensation cases.

Allows for hot shellside liquid relief load heating.

Gas blowby relief load Models gas escape through a liquid control valve. Includes control valve rating using ISA equations and

allows for attached fittings.

Includes bypass valve modelling (adiabatic/isothermal) Has database of typical control and bypass valve

coefficients.

All data is definedon a graphicinterface for clarity.

KNOCK OUT DRUM SIZING MODULE

Supports unlimited stand alone or network linked calculations

Sizes vertical or horizontal knock out drums

Sizes based on user provided hold-up time and droplet size criteria.

Includes vessel shell weight estimation from design parameters

Allows for horizontal drum optimisation

Presents several configurations for horizontal drums to allow for optimisationbased on shell weight.


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FLARE SYSTEM PURGE RATE MODULE

Calculate required purge rate with 3 methods

The Husa, Tan and modified Husa methods are provided to calculate a maximum 6% oxygen concentrationat a distance of 25f from the flare tip.

ADDITIONAL NOISE MODULES

Calculate noise produced by control valves and piping.

PHYSICAL PROPERTY CALCULATOR MODULE

Generate additional physical properties

Perform a flash calculation and generate additionalphysical properties for a specified composition.

Create physical property tables

Data for a selected pressure and temperature range.

Generate phase envelopes

Make standard dry basedphase envelopes

Make full phase envelopesshowing 2 and 3 phaseregions

UNIT CONVERSION MODULE

Aside from the ability to select custom units for the flare network, Flaretot also offers a unit conversion module coveringconversion from a wide range of other units.

flaretot - total flare analysis

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