Natural Gas City Gate Station

Product Overview

HUAYI Natural Gas City Gate Station provides an integrated interface between high- or medium-pressure gas transmission pipelines and downstream urban or regional gas distribution networks.

The station can combine multiple gas conditioning and control functions within a coordinated process system, allowing incoming natural gas to be filtered, measured, heated where required, pressure-regulated and safely delivered to the downstream network.

Typical Process Functions

Depending on the project requirements, the City Gate Station can incorporate:

• Gas inlet isolation

• Gas filtration and separation

• Flow metering

• Gas heating

• Pressure regulation

• Overpressure and underpressure protection

• Safety shut-off and relief

• Gas odorization

• Gas distribution

• Pressure and temperature monitoring

• Flow and operating data acquisition

• Remote monitoring and control

The actual process configuration is determined according to the upstream gas conditions and downstream distribution requirements.

Typical Process Flow

A typical station process may include:

Gas Inlet → Isolation → Filtration / Separation → Metering → Gas Heating → Pressure Regulation & Safety Protection → Odorization → Gas Outlet

The actual sequence and equipment configuration can be adjusted according to project requirements.

Gas Filtration

Gas filtration equipment is used to remove solid particles and other contaminants from the incoming gas stream to help protect downstream metering, regulating and control equipment.

Filter configuration, filtration requirements, differential pressure monitoring and drainage arrangements can be selected according to the gas conditions and project specifications.

Gas Metering

The station can incorporate gas flow metering equipment according to the required capacity, accuracy and project standards.

Depending on the application, the metering system can include flow meters, pressure and temperature transmitters, flow computers and associated instrumentation.

The final metering technology is selected according to the required flow range, operating pressure and project specifications.

Gas Heating

Gas heating can be incorporated where required to manage the temperature reduction associated with pressure regulation or to maintain suitable downstream gas conditions.

Heating technology and capacity are determined according to the inlet gas temperature, pressure reduction ratio, gas flow and required outlet conditions.

Pressure Regulation and Safety Protection

The pressure regulating system reduces and controls the incoming gas pressure according to downstream distribution requirements.

Depending on the required operating philosophy, the station can incorporate multiple regulating lines, standby arrangements, safety shut-off devices and pressure relief protection.

Regulating configuration and protection set points are determined according to the confirmed operating conditions and project requirements.

Gas Odorization

Where required for downstream gas distribution, an odorization system can be integrated into the City Gate Station.

The odorization system can be configured according to gas flow, selected odorant, required dosing rate, operating pressure and project control requirements.

Instrumentation and Station Control

Depending on the project scope, the station can incorporate instrumentation and control functions for monitoring parameters such as:

• Gas flow

• Inlet and outlet pressure

• Gas temperature

• Filter differential pressure

• Equipment operating status

• Alarm and safety conditions

Remote monitoring, telemetry and control functions can also be incorporated according to the required station automation philosophy and communication requirements.

Typical Applications

Natural Gas City Gate Stations can be engineered for applications including:

• Urban natural gas distribution networks

• Regional gas distribution systems

• Industrial gas distribution networks

• Natural gas transmission and distribution interfaces

• Municipal gas supply systems

• Large commercial and industrial gas supply networks

Customized Engineering

HUAYI can engineer the City Gate Station according to project-specific requirements, including:

• Required gas flow capacity

• Gas composition

• Inlet pressure

• Required outlet pressure

• Design pressure

• Inlet and outlet temperature

• Filtration requirements

• Metering requirements

• Gas heating requirements

• Pressure regulating configuration

• Odorization requirements

• Instrumentation and control philosophy

• Remote monitoring and communication requirements

• Applicable codes and standards

• Site conditions and equipment arrangement

Final station configuration and technical parameters are determined according to the confirmed process conditions and project specifications.

Documentation and Technical Support

Depending on the project scope, HUAYI can provide relevant technical documentation for engineering review, manufacturing, installation and commissioning coordination.

Detailed technical parameters, process documentation, drawings and project-specific documentation can be prepared after confirmation of the operating conditions and supply scope.