Help is available on each data entry screen. In addition a How do I? screen steps you through various options in the program.
Calculations may be performed in English units or SI units.
The pipe roughness, used in pressure drop calculations may also be varied along the pipeline, thus aiding the analysis of internally coated and bare pipelines. The pipeline data is created in an Excel style spreadsheet that can easily be imported to and from Excel, via the Windows clipboard. The gas pressure at the delivery end may be held at some desired value or the discharge pressure at the last compressor station may be held constant and the corresponding delivery pressure at the pipeline terminus calculated.
Multiple compressor stations along the pipeline may be specified. Gas fuel consumption for turbine driven compressor stations can also be calculated. Pipeline elevations are taken into account in determining the pressures and horsepower required at each compressor station. If a head compressor station does not exist, you may specify an inlet pressure at the pipe origin from a connecting pipeline.
Gas may be injected or delivered at various locations along the pipeline. The composition of the gas may be specified, if available. Otherwise the gas gravity and viscosity may be input for each gas stream entering the pipeline.
Pressure drop for each pipe segment is calculated using one of the various equations (such as AGA, Colebrook-White, Darcy-Weisbach, General Flow Equation, IGT, Panhandle A & B, and Weymouth equations). The gas compressibility factor may be calculated using Standing-Katz, AGA or the CNGA methods.
The pipeline may be bare or insulated. The thermal conductivity of the pipe, insulation and surrounding soil may all be varied along the entire length of the pipeline, or an overall heat transfer coefficient may be specified.
In a grass-roots pipeline, the approximate number and locations of compressor stations required may be quickly calculated, based upon a given flow rate, specified compression ratio and maximum compressor station discharge pressure.
The results of the calculations may be customized in the output report. A short output or a long one may be generated as desired.
The pipeline pressures, temperatures, compressor station suction and discharge pressures and compressor horsepower required are calculated and output on the screen. Gas fuel consumption for turbine driven compressor stations can also be calculated. Results of each calculation are also saved to a disk file.
To view a full sample of the output report, click here: www.systek.us/downloads/Gasmod/GasmodOutputReport.txt
The hydraulic pressure gradient depicting the gas pressure variation along the pipeline may also be plotted.
For preliminary feasibility studies, GASMOD includes an option for calculating the pipeline capital cost and the annual operating cost and thus determining the annual cost of service and transportation tariff.
Based on specified gas fuel cost, pipe material and labor cost, the operating cost, capital cost and tariff for a pipeline system can be determined for quick economic analyses.
Features:
GASMOD has the following significant features:
- Simulates steady state single-phase hydraulics of a pipeline transporting gas, considering heat transfer between the gas and the surrounding medium.
- Gas may be injected or delivered at various points along the pipeline.
- The pipe diameter, wall thickness, absolute roughness, thermal conductivity, insulation thickness and the surrounding soil temperatures and soil thermal conductivity can all be varied throughout the length of the pipeline.
- Available pressure drop formulas include AGA, Colebrook-White, General Flow Equation, IGT,Panhandle A & B, and Weymouth equations.
- The gas compressibility factor is calculated using Standing-Katz, AGA or the CNGA methods.
- Compressor stations may be located (maximum: 50) along the pipeline. The maximum discharge pressure, required minimum suction pressure and the overall compressor efficiency at each station may be specified. The final delivery pressure at the end of the pipeline may be fixed and the corresponding discharge pressure at the last compressor station computed. Alternatively, the discharge pressure at the last compressor station may be fixed and the resulting pipeline delivery pressure calculated.
- Compressor station suction and discharge piping losses may also be included.
- For preliminary feasibility studies, the optimum locations of compressor stations may be determined for specified Maximum Allowable Operating Pressure(MAOP) and a fixed compression ratio.
- The pipeline may have branches or delivery segments of pipe. Maximum number of pipe branches is limited to 50. Each branch pipe may have up to 500 data points (nodes) compared to a maximum of 1000 nodes for the main pipeline. Branch pipes may not have compressor stations. Flow injection and delivery in the branches can be modeled.
- The main pipeline may be looped. Maximum number of loops is limited to 50. Pipe loops may not have compressor stations.
- The line pack in the main pipeline may be calculated.
- The hydraulic pressure gradient can be plotted.
- The capital cost of the pipeline and compressor stations and the annual operating cost for the pipeline may be calculated. This is based on specified material and labor costs and fuel gas cost for the turbine driven compressor stations. Annual cost of service and the transportation tariff for the pipeline can also be quickly calculated for economic analyses and feasibility studies.
GASMOD is ideal for the analysis of existing gas pipelines or the design of new pipelines. The latest version of this software can be run on Pentium and AMD based computers with a minimum 256 MB RAM running Microsoft Windows 98/2000/XP and Windows Vista. A minimum hard disk space of 20 MB is required for installing the software.
Multi-user and Network versions are available. Purchase price includes Free Technical Support for 60 days after purchase date. Annual Maintenance and Technical Support Plan can be purchased separately (includes all updates and maintenance releases for a full year). Additionally, a two-day hands-on training program for GASMOD is also available. Please email SYSTEK for details.
Technical Support:
Technical support is provided for licensed users of the software for a period of sixty (60) days from the initial purchase date. Affordable Annual Technical Support plans are available after the initial 60-day period. Minor program updates and maintenance releases are posted at SYSTEK's Web site for licensed users to download free of charge. You may need to contact SYSTEK to obtain a password for downloading and installing an updates from the web site. Major upgrades are issued twice a year at special prices to current licensed users. Call or write for details of Technical Support plans.
Purchase/Lease:
You may purchase or lease GASMOD software. The minimum lease period is two months. Multi-user licenses are also available. The software is available for purchase or lease via direct download from our web site as well as via CD-ROM shipped to you in the mail. Registration is via the internet. A single user license may be installed on multiple machines and registered via the internet. However, only one copy may be executed at any time on one computer.
We welcome comments and suggestions from users. Please give us your thoughts on how GASMOD can be improved further. Our goal is to make this software the most user-friendly program available for engineers.
Contact SYSTEK as follows:
SYSTEK Technologies, Inc.
Phone/fax: (928) 453-9587
Email: techsupport@systek.us
Web Site: www.systek.us
