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1 Introduction USE-IT is a Case Study tool, for the UniSim® Design program. USE-IT takes the form of a Microsoft Excel worksheet which is used to configure the case study and store the results.
2 Installation When installing UniSim Design if you choose the Complete option the USE-IT tool will be installed.
If you choose the Custom option, the USE-IT feature is initially disabled. At this point the user can choose to install USE--IT by enabling the option. NOTE : Excel macros security should be enabled in order to use USE-IT (UniSim Excel Interface Tool) Excel 2003 : Excel Standard Menu Æ Tools Æ Macro Æ Security Æ Check Security Level Medium
Excel 2007 : Office Button Æ Excel options Æ Trust center Æ Trust center settings Macro settings Æ Enable all macros
8/13/2010
Predict-SW for UniSim Design Overview
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UniSim Design (Release R380) now provides users with access to Predict-SW (Release Version 2.0) through the UniSim Design interface. This document will provide users with a brief background on Predict-SW and information needed to utilize it. Predict-SW is a user-friendly software system, which incorporates comprehensive data obtained in a joint industry sponsored program conducted by Honeywell International Inc.
between March 2000 and February 2003 entitled "Prediction and Assessment of Ammonium Bi-sulfide Corrosion under Refinery Sour Water Service Conditions". Data from this program, combined with flow modeling calculations on plant tubing/piping configurations are used to predict the corrosion rates of the fourteen materials studied over a wide range of NH4HS concentration, H2S partial pressure, temperature, hydrocarbon content and chemical treatment.
Within UniSim Design, Predict-SW can be launched as a Thermo Utility and stream data can be transferred to Predict-SW and the results from Predict-SW are sent back to UniSim Design. The following sections are used to illustrate how users can attach the Predict-SW utility to a particular stream and get corrosion rate predictions from UniSim Design. Some details on Predict-SW program limitations are also presented.
UniSim Design (Release R380) now provides users with access to Predict-SW (Release Version 2.0) through the UniSim Design interface. This document will provide users with a brief background on Predict-SW and information needed to utilize it. Predict-SW is a user-friendly software system, which incorporates comprehensive data obtained in a joint industry sponsored program conducted by Honeywell International Inc.
between March 2000 and February 2003 entitled "Prediction and Assessment of Ammonium Bi-sulfide Corrosion under Refinery Sour Water Service Conditions". Data from this program, combined with flow modeling calculations on plant tubing/piping configurations are used to predict the corrosion rates of the fourteen materials studied over a wide range of NH4HS concentration, H2S partial pressure, temperature, hydrocarbon content and chemical treatment.
Within UniSim Design, Predict-SW can be launched as a Thermo Utility and stream data can be transferred to Predict-SW and the results from Predict-SW are sent back to UniSim Design. The following sections are used to illustrate how users can attach the Predict-SW utility to a particular stream and get corrosion rate predictions from UniSim Design. Some details on Predict-SW program limitations are also presented.
UniSim Design PIPESYS User Guide
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A pipeline must transport fluids over diverse topography and under varied conditions. Ideally this would be done efficiently with a correctly sized pipeline that adequately accounts for pressure drop, heat losses and includes the properly specified and sized inline facilities, such as compressors, heaters or fittings. Due to the complexity of pipeline network calculations, this often proves a difficult task. It is not uncommon that during the design phase an over-sized pipe is chosen to compensate for inaccuracies in the pressure loss calculations. With multi-phase flow, this can lead to greater pressure and temperature losses, increased requirements for liquid handling and increased pipe corrosion.
Accurate fluid modelling helps to avoid these and other complications and results in a more economic pipeline system. To accomplish this requires single and multi-phase flow technology that is capable of accurately and efficiently simulating the pipeline flow. PIPESYS has far-reaching capabilities to accurately and powerfully model pipeline hydraulics. It uses the most reliable single and multi-phase flow technology available to simulate pipeline flow.
Functioning as a seamless extension to UniSim Design, PIPESYS has access to UniSim Design features such as the component database and fluid properties. PIPESYS includes many inline equipment and facility options relevant to pipeline construction and testing. The extension models pipelines that stretch over varied elevations and environments.
A pipeline must transport fluids over diverse topography and under varied conditions. Ideally this would be done efficiently with a correctly sized pipeline that adequately accounts for pressure drop, heat losses and includes the properly specified and sized inline facilities, such as compressors, heaters or fittings. Due to the complexity of pipeline network calculations, this often proves a difficult task. It is not uncommon that during the design phase an over-sized pipe is chosen to compensate for inaccuracies in the pressure loss calculations. With multi-phase flow, this can lead to greater pressure and temperature losses, increased requirements for liquid handling and increased pipe corrosion.
Accurate fluid modelling helps to avoid these and other complications and results in a more economic pipeline system. To accomplish this requires single and multi-phase flow technology that is capable of accurately and efficiently simulating the pipeline flow. PIPESYS has far-reaching capabilities to accurately and powerfully model pipeline hydraulics. It uses the most reliable single and multi-phase flow technology available to simulate pipeline flow.
Functioning as a seamless extension to UniSim Design, PIPESYS has access to UniSim Design features such as the component database and fluid properties. PIPESYS includes many inline equipment and facility options relevant to pipeline construction and testing. The extension models pipelines that stretch over varied elevations and environments.
UniSim Design PIPESYS Tutorial
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3.2.3 Compare CompressorsThe PIPESYS calculations indicate that when a 1000 hp compressor is used the wellhead pressure is lower than when a 750 hp compressor is used. However, this may not result in an economically significant higher production rate, especially if these pressures are located on the steeper region of the wellhead performance curve. Figure 3.4, Figure 3.5 and Figure 3.6 at the end of this application show the wellhead performance curves for Well A, Well B and Well C, respectively.
These curves can be used to evaluate compressor size that would be most economical for use in a particular pipeline network.Locate 686.7 psia and 753.2 psia on the Well A wellhead curve and you should find that these correspond to flows of 11.1 MMSCFD and 10.8 MMSCFD, respectively. This indicates that the 1000 hp compressor would increase production by less than 5%, over that of the 750 hp compressor.
It is therefore reasonable to conclude that adding compression to the system is worthwhile since both compressors lower the wellhead pressures by a large amount, but the small increase in production may not be enough to justify the choice of the 1000 hp compressor. For this example, assume that economic and engineering considerations favour installing the 750 hp compressor.
3.2.3 Compare CompressorsThe PIPESYS calculations indicate that when a 1000 hp compressor is used the wellhead pressure is lower than when a 750 hp compressor is used. However, this may not result in an economically significant higher production rate, especially if these pressures are located on the steeper region of the wellhead performance curve. Figure 3.4, Figure 3.5 and Figure 3.6 at the end of this application show the wellhead performance curves for Well A, Well B and Well C, respectively.
These curves can be used to evaluate compressor size that would be most economical for use in a particular pipeline network.Locate 686.7 psia and 753.2 psia on the Well A wellhead curve and you should find that these correspond to flows of 11.1 MMSCFD and 10.8 MMSCFD, respectively. This indicates that the 1000 hp compressor would increase production by less than 5%, over that of the 750 hp compressor.
It is therefore reasonable to conclude that adding compression to the system is worthwhile since both compressors lower the wellhead pressures by a large amount, but the small increase in production may not be enough to justify the choice of the 1000 hp compressor. For this example, assume that economic and engineering considerations favour installing the 750 hp compressor.
UniSim Design PIPESYS Getting Started
http://www.cadfamily.com/downinfo/300595.html
The PIPESYS extension includes these pipeline units, each of which is accessible through a property view:
• Pipe - The basic pipeline component used to model a straight section of pipe and its physical characteristics.
• Compressor - Boosts the gas pressure in a pipeline.
• Pump - Boosts the liquid pressure in a pipeline.
• Heater - Adds heat to the flowing fluid(s).
• Cooler - Removes heat from the flowing fluid(s).
• Unit X - A black box component that allows you to impose arbitrary changes in pressure and temperature on the flowing fluid(s).
The PIPESYS extension includes these pipeline units, each of which is accessible through a property view:
• Pipe - The basic pipeline component used to model a straight section of pipe and its physical characteristics.
• Compressor - Boosts the gas pressure in a pipeline.
• Pump - Boosts the liquid pressure in a pipeline.
• Heater - Adds heat to the flowing fluid(s).
• Cooler - Removes heat from the flowing fluid(s).
• Unit X - A black box component that allows you to impose arbitrary changes in pressure and temperature on the flowing fluid(s).
UniSim Design Operations Guide
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In modeling operations, UniSim Design uses a Degrees of Freedom approach, which increases the flexibility with which solutions are obtained. For most operations, you are not constrained to provide information in a specific order, or even to provide a specific set of information. As you provide information to the operation, UniSim Design calculates any unknowns that can be determined based on what you have entered.For instance, consider the Pump operation. If you provide a fully-defined inlet stream to the pump, UniSim Design immediately passes the composition and flow to the outlet.
If you then provide a percent efficiency and pressure rise, the outlet and energy streams is fully defined. If, on the other hand, the flowrate of the inlet stream is undefined, UniSim Design cannot calculate any outlet conditions until you provide three parameters, such as the efficiency, pressure rise, and work. In the case of the Pump operation, there are three degrees of freedom, thus, three parameters are required to fully define the outlet stream.All information concerning a unit operation can be found on the tabs and pages of its property view. Each tab in the property view contains pages which pertain to the unit operation, such as its stream connections, physical parameters (for example, pressure drop and energy input), or dynamic parameters such as vessel rating and valve information.
In modeling operations, UniSim Design uses a Degrees of Freedom approach, which increases the flexibility with which solutions are obtained. For most operations, you are not constrained to provide information in a specific order, or even to provide a specific set of information. As you provide information to the operation, UniSim Design calculates any unknowns that can be determined based on what you have entered.For instance, consider the Pump operation. If you provide a fully-defined inlet stream to the pump, UniSim Design immediately passes the composition and flow to the outlet.
If you then provide a percent efficiency and pressure rise, the outlet and energy streams is fully defined. If, on the other hand, the flowrate of the inlet stream is undefined, UniSim Design cannot calculate any outlet conditions until you provide three parameters, such as the efficiency, pressure rise, and work. In the case of the Pump operation, there are three degrees of freedom, thus, three parameters are required to fully define the outlet stream.All information concerning a unit operation can be found on the tabs and pages of its property view. Each tab in the property view contains pages which pertain to the unit operation, such as its stream connections, physical parameters (for example, pressure drop and energy input), or dynamic parameters such as vessel rating and valve information.
UniSim Design OLGA Link User Guide
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Known ProblemsThe OLGA Server does not always consistently handle the case of labels. To avoid problems, it is recommended that you always use upper case for all labels both within the extension and in the *.inp file.On occasion and with certain LAN networks, it has been observed that the first attempt to connect to the OLGA Server (either via the Connect button on the Server page of the Setup tab or via the Auto Start feature) may result in a refusal to connect.
Simply try again and the connection should be successful. This problem occurs when you typically start a new UniSim Design session.Whilst this is not a problem, it has been observed that simulating your integrated model across two computers with a LAN may lead to slower simulation run speeds.
In our testing a 2 computer model (one computer for UniSim Design and one for OLGA) obtained a simulation speed of 4 times real time. When the same model was run on a single computer, 24 times real time was achieved. This will be dependent on your network communication speed.
Known ProblemsThe OLGA Server does not always consistently handle the case of labels. To avoid problems, it is recommended that you always use upper case for all labels both within the extension and in the *.inp file.On occasion and with certain LAN networks, it has been observed that the first attempt to connect to the OLGA Server (either via the Connect button on the Server page of the Setup tab or via the Auto Start feature) may result in a refusal to connect.
Simply try again and the connection should be successful. This problem occurs when you typically start a new UniSim Design session.Whilst this is not a problem, it has been observed that simulating your integrated model across two computers with a LAN may lead to slower simulation run speeds.
In our testing a 2 computer model (one computer for UniSim Design and one for OLGA) obtained a simulation speed of 4 times real time. When the same model was run on a single computer, 24 times real time was achieved. This will be dependent on your network communication speed.
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