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Questions and Answers
What design requirement calls for provision to be made for preheaters of natural gas?
In what type of area should a CGS be placed as per the provided text?
What is the maximum transmission pressure system value mentioned in the text?
How is the DRS compared to the City Gate in terms of capacity?
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What causes coalescence of droplets in the gas filtration process?
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Where are contaminants generally collected in the filtration process?
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What defines the Equation Of State (EOS) for process streams in a chemical plant?
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How is dust and liquid particles separated from the gas stream?
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What happens to gas velocity as larger solid particles are removed by gravity?
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Study Notes
City Gate Station (CGS)
- Custody transfer occurs from the transmission company to the distribution company at the CGS.
- Functions include filtration, pressure reduction, custody transfer metering, odourization, and preheating of natural gas if necessary.
- Key components consist of inlet/outlet valves, filters, separators, metering skid, heaters, pressure reduction skid, slam shut off valves, creep relief valves, and odourization equipment.
- The CGS is strategically located at the main tap-off point of the transmission line.
- Contains high-pressure transmission pipeline inlet supply and essential monitoring and control systems.
- The pressure reduction facility features pressure regulators with standby units, each equipped with slam-shut protection.
Gas Pipeline Network
- City or local natural gas distribution involves an interconnected network of pipelines for transporting gas from high-pressure transmission mains to medium-pressure distribution grids.
- Supports domestic, commercial, and industrial premises along with CNG stations in a defined geographical area.
- The value chain includes multiple segments: PNG Industrial, PNG Domestic, and CNG.
Pipeline Pressure Specifications
- High-pressure transmission mains operate between 40-100 bar for industrial use.
- City Gate Station pressure averages 38-40 bar, while distribution systems operate at 4 bar for residential areas.
- CNG stations function at 200-250 bar, while service regulators and pipelines operate at pressures ranging from 21 mbar to 4 bar and below.
Infrastructure Overview
- The pipeline network consists of a primary high-pressure system using steel pipelines (49 to 7 bar) connecting transmission pipelines to CGS and CNG stations.
- Secondary networks utilize medium to low pressure through polyethylene distribution systems, bridging DRS to service regulators (4 to 1.5 bar).
- Tertiary networks are built with GI or copper piping, maintaining low pressures under 100 mbar to connect end users.
Skill Development in CGD
- A 2024 Skill Development program is highlighted, focusing on technical aspects of City Gas Distribution (CGD).
- Emphasizes the importance of gas filtration, odourization, and effective metering in safe gas distribution.
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Description
Test your knowledge on the custody transfer process from a transmission company to a distribution company at a City Gas Station (CGS). Learn about the functions and components of a CGS including filtration, pressure reduction, metering, odourization, and more. Get ready for the Skill Development 2024 Program!
