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DNV PHAST MANUAL PDF

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PHAST™. The Multi Component extension supports the core steady-state discharge models, and dispersion modelling via the UDM, currently limited to clouds. PHAST Tutorial Manual - Download as PDF File .pdf), Text File .txt) or read online. tut. Contact [email protected] for more information. Re: DNV PHAST step by step guide. Good afternoon I have a Phast manual. Pdf, but I have no license Phast , could you help me on.


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Prerequisite: The course is suitable for new users and for more experienced users who have not attended a formal training course or would like a refresher. Training catalogue PHAST, SAFETI AND KFX 03 The course introduces the concepts and models within Phast. . It also introduces methods of manual. We are using Phast , dispersion / explosion modelling with consideration Energy_Model/links/aaebccc4e1apdf?origin.

The Study Tree pane allows you to organise and edit the input data for your consequence analysis. The pane contains a number of tab sections, each of which covers a different type of input data, and these tab sections are described below. The term Model is used in two different ways in PHAST, though these different meanings are unlikely to cause you confusion. Model: a set of available calculations The program has several different sets of calculations available, and each of these sets is known as a separate Model and has its own icon. There are eleven different types of Model in total. You define a given hazardous event that you want to analyse by selecting the most suitable Model from the list of the eleven Models.

Chapter 1: Introduction Pinpointing an Individual Model If you select a Model in the Study Tree and then select Pinpoint from the View menu or press the F4 key , the dot for that Model will become centred in the Map window and will also be highlighted i.

This allows you to locate a specific Model, which is useful if you cannot identify the name for that Model on the Map.

Viewing Input Data The section above introduced the main types of input data and their organisation, and this section describes how to work on the details of the input data. The dialog contains a large number of input fields organised over sixteen tab sections, but many of these fields are relevant only to advanced modelling options e. Input Dialog for the Chlorine Rupture Model Chapter 1: Introduction Getting Help on the Input Data This tutorial does not attempt to describe every item on input data, but the program is supplied with comprehensive online Help.

Every input dialog contains a Help button at the bottom right. When you click on this button, the online Help will appear in a separate window, as shown. The Help Window The Help Window will be displaying a description of the current tab section, but you can use the links inside the topic and the Contents, Index and Search tabs to reach any topic in the Help system and gain a full understanding of the way that the input data will be used in the calculations and the appropriate values that you should set for the hazardous events that you want to model.

Most dialogs also have a Whats This Help button in the form of a question mark at the right of the title bar. If you click on this button, the cursor will change to a question mark, showing that you are in Whats This Help mode, and if you then click on a field in the dialog, a popup window will appear over the field, describing the field and giving advice on setting values, as shown.

There are some tab sections that appear in the input dialog for more than one Model. The Help is written in order to give full guidance for either Model, so there may be references in the Help to features that are not currently relevant to you. After you have finished exploring the input dialog, click on Cancel to close the input dialog without saving any changes you might have made. If you wish, you can move to the other tab sections and explore the input dialogs for other types of data.

Toxic Release Dispersion Modelling with PHAST: Parametric Sensitivity Analysis - PDF

The program will process the calculations for each of the eighteen Models in turn, performing the calculations for each of the three Global Weathers, and showing the progress through the calculations.

When the calculations for a given Model have been completed for all three Weathers, the name of that Model will change from black to blue, which is the colour-coding that the program uses to show that a Model has run successfully and has a complete set of results.

The calculations will take several minutes to complete, depending on the speed of your machine.

Phast pdf dnv manual

You do not have to run the calculations for all Models and all Weathers. The selection of Weathers in the Setup dialog will be used for all calculations, but the selection of Models will be used only when you select Batch Run from the Run menu. Viewing the Graphs for the Chlorine and Butadiene Releases Select the Vessels or Pipe Sources folder and then select Graph from the View menu, from the right-click menu or the toolbars.

A dialog will appear as shown, prompting you to chose the weather conditions whose results you want to view. If you had selected a single Model rather than a folder with multiple Models, then the dialog would have checkboxes next to the Weathers instead of radio buttons, and you would be able to compare the results for several Weathers for that Model.

If you choose a single Weather in this situation, then the graphs will have additional features that are not available when you are viewing the results for multiple Models or Weathers. For this example, select the F 1.

This is the weather with the most stable conditions, and is likely to give the longest dispersion distances.

211576535 PHAST Tutorial Manual

When you click on OK there will be a pause of a few seconds, and then the Graph Window will open as shown in the space to the right of the Study Tree pane. The Graph Window The Graph Window will usually contain many tab sections, each with a different type of graph. The tab sections included for a particular combination of Model will depend on the type of the Models e. The Chlorine and Butadiene Models have graphs for cloud concentration, for pool vaporisation, for toxic effects, for jet fire, fireball and flash fire effects, and for explosion effects.

S ij where i j , the second-order sensitivity indices, measures the interaction effect of p i and p j on the output variance. Other higher-order indices are defined in the same manner. The total sensitivity index, S Ti is the sum of all sensitivity indices involving factor p i Homma and Saltelli, The FAST method calculates the first-order and total sensitivity indices, whereas Sobol s method, in addition to these, also provides all higher-order sensitivity indices to determine quantitatively the interaction between parameters.

However, the computational cost implied by Sobol s method increases significantly as the number of indices to be calculated is increases. Our method comprises of six steps, as shown in Figure 1. Depending on the selected sensitivity analysis method FAST or Sobol , SimLab calculates various sensitivity indices 1 st order, 2 nd order,, Total order.

Case Study We have studied a nitric oxide gas release scenario. Nitric oxide NO is stored in a pressurized tank and it is assumed that there is sufficient quantity of NO available for continuous discharge up to seconds.

The source term considered is Leak : a hole in the tank results in the release of NO to the atmosphere. The discharge calculations are carried out in PHAST using Orifice model, which calculates release rate and state of the gas after its expansion to the atmospheric pressure.

These discharge data are used by UDM for the consequence calculations. UDM simulates the progression of the cloud through several phases: jet, heavy, transition and passive Gaussian concentration profile phase.

As NO is not a heavy gas, only three phases have been observed during the dispersion of its cloud: jet phase, transition phase and passive phase.

Phast manual pdf dnv

The jet phase is dominant initially, followed by the transition phase and the full passive phase. Each phase uses a separate set of correlations to calculate the dimension and concentration of the cloud in the downwind direction. The starting of the transition phase depends on several criteria, such as maximum difference between cloud and wind speeds and maximum difference between cloud and atmosphere densities.

This transition is needed to avoid discontinuous entrainments and spread rates. The scenario is defined as follows: continuous horizontal release over land, Pasquill stability class D, temperature of dispersing surface equals to atmospheric temperature.

The following model outputs are considered for the analysis: Output 1. Concentration at m downwind and at 1.

Downwind distance and at 1. Downwind distance where transition to passive phase occurs Dtr 5 The description of the independent input parameters studied is given in Table 1.

Pressure Continuous uniform Pa Ta Atm. Temperature Continuous uniform K Ha Atm. Figure 2 represents the first-order S i and total S Ti sensitivity indices for the model outputs C, C10k and Xcmax.

For the output C Figure 2a , it can be observed from the S i values that release height ZR and orifice diameter Do have a strong impact on this output variance.

Furthermore, high S Ti values of these parameters suggest that there is a strong interaction between these two parameters. For the model output C10k Figure 2b , orifice diameter Do , storage pressure Pst and wind speed Ua are the most influential parameters alone and interaction.

Chapter 1: Introduction Pinpointing an Individual Model If you select a Model in the Study Tree and then select Pinpoint from the View menu or press the F4 key , the dot for that Model will become centred in the Map window and will also be highlighted i. This allows you to locate a specific Model, which is useful if you cannot identify the name for that Model on the Map. Viewing Input Data The section above introduced the main types of input data and their organisation, and this section describes how to work on the details of the input data.

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The dialog contains a large number of input fields organised over sixteen tab sections, but many of these fields are relevant only to advanced modelling options e. Input Dialog for the Chlorine Rupture Model Chapter 1: Introduction Getting Help on the Input Data This tutorial does not attempt to describe every item on input data, but the program is supplied with comprehensive online Help.

Every input dialog contains a Help button at the bottom right. When you click on this button, the online Help will appear in a separate window, as shown.

The Help Window The Help Window will be displaying a description of the current tab section, but you can use the links inside the topic and the Contents, Index and Search tabs to reach any topic in the Help system and gain a full understanding of the way that the input data will be used in the calculations and the appropriate values that you should set for the hazardous events that you want to model. Most dialogs also have a Whats This Help button in the form of a question mark at the right of the title bar.

If you click on this button, the cursor will change to a question mark, showing that you are in Whats This Help mode, and if you then click on a field in the dialog, a popup window will appear over the field, describing the field and giving advice on setting values, as shown.

Pdf manual dnv phast

There are some tab sections that appear in the input dialog for more than one Model. The Help is written in order to give full guidance for either Model, so there may be references in the Help to features that are not currently relevant to you. After you have finished exploring the input dialog, click on Cancel to close the input dialog without saving any changes you might have made.

If you wish, you can move to the other tab sections and explore the input dialogs for other types of data.

More stuff

The program will process the calculations for each of the eighteen Models in turn, performing the calculations for each of the three Global Weathers, and showing the progress through the calculations.

When the calculations for a given Model have been completed for all three Weathers, the name of that Model will change from black to blue, which is the colour-coding that the program uses to show that a Model has run successfully and has a complete set of results.

The calculations will take several minutes to complete, depending on the speed of your machine. You do not have to run the calculations for all Models and all Weathers. The selection of Weathers in the Setup dialog will be used for all calculations, but the selection of Models will be used only when you select Batch Run from the Run menu. Viewing the Graphs for the Chlorine and Butadiene Releases Select the Vessels or Pipe Sources folder and then select Graph from the View menu, from the right-click menu or the toolbars.

A dialog will appear as shown, prompting you to chose the weather conditions whose results you want to view. If you had selected a single Model rather than a folder with multiple Models, then the dialog would have checkboxes next to the Weathers instead of radio buttons, and you would be able to compare the results for several Weathers for that Model.

If you choose a single Weather in this situation, then the graphs will have additional features that are not available when you are viewing the results for multiple Models or Weathers. For this example, select the F 1. This is the weather with the most stable conditions, and is likely to give the longest dispersion distances. When you click on OK there will be a pause of a few seconds, and then the Graph Window will open as shown in the space to the right of the Study Tree pane.

Phast manual pdf dnv

The Graph Window The Graph Window will usually contain many tab sections, each with a different type of graph. The tab sections included for a particular combination of Model will depend on the type of the Models e. The Chlorine and Butadiene Models have graphs for cloud concentration, for pool vaporisation, for toxic effects, for jet fire, fireball and flash fire effects, and for explosion effects.