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City Gas

city gas

What is City Gas

City gas refers to a form of natural gas collected from gas fields,
which is liquefied into LNG, transported, vaporized back into natural gas,
and supplied to places where it is in demand, through pipelines.

  • Environment-friendlyDuring the liquefaction process of natural gas, impurities such as dust, sulfur, nitrogen, etc. are removed, therefore leading to almost no emission of pollutants during combustion, making it a clean form of energy.

  • EconomicalNatural gas has a relatively higher combustibility and thermal efficiency, so it is an economical fuel that contributes to energy conservation.

  • Convenient to UseCity gas is supplied to gas appliances through pipes. Therefore, it does not require separate transportation or storage facilities, and creates no foreign materials. Also, as their gas appliances are small, their space occupancy is lower

  • SafeNatural gas is lighter than air. Therefore, if there is a leakage, it will diffuse into the air quickly, making it highly unlikely to have leakages that will lead to fire and other accidents. Furthermore, the ignition temperature of natural gas is higher than that of other fuels, making it a safer fuel.

  • Can Be Supplied SafelyNatural gas is stored in abundance in various places throughout the world, thus playing a significant role as an alternative to oil.


Due to its environment-friendliness, safety, convenience, and economic feasibility, city gas is widely used for domestic, commercial, business, industrial, and power generation purposes.

  • Business or commercial buildings
  • House heating and cooking
  • Combined heat and power generation
  • Industrial
  • Cooling
  • Vehicle CNG
Supply Route

We receive our natural gas supply from KOGAS, and supply it to ordinary users after passing a district or region monostat.

Supply Route : Gas fields > Liquefaction base > Transportation by sea > Receiving terminals (Pyeongtaek/Incheon/Tongyeong) > High-pressure pipe(7MPa) > Supply management center > Supply management center(2.7MPa), District heating(0.85MPa), Medium-pressure pipe(0.85MPa) > District monostat City gas. District monostat City gas > Medium-pressure pipe(0.4~0.5MPa) > Industrial, Commercial, Regional monostat. Regional monostat >  Low-pressure pipe(2.5MPa) > Domestic, Business/Commercial.
What Is GHP?

The gas-engine-driven heat pump (GHP) is a new-concept cooling/heating system that uses gas instead of electricity as a fuel. A heat pump that uses LNG as a heat source is driven to circulate refrigerants in summer for cooling and in winter for heating.

  • Uses Clean and Safe Energy

    The natural gas used as the major fuel source by GHPs is a clean form of energy that emits almost no pollutants during its combustion, therefore contributing to the protection of the environment. In addition, natural gas is lighter than air, so in case of a leakage, it diffuses away easily, and its ignition temperature is high, making it a safe energy source that is highly unlikely to explode.

    Comparison of pollutant emissions :  gray(Sulfur oxygen compounds), brown(Carbon monoxide), orange(Dust). Natural gas(Almost no emission of pollutants), Kerosene, Crude oil, Coal briquette.
  • Standardizes Energy Demand

    Demand for energy peaks in summer, mainly due to the heat. GHP uses gas instead of electricity for cooling, thus lowering the utilization of electricity and ultimately standardizing the demand for electricity throughout the year. It also contributes to decreasing social costs by reducing costs related to the construction and operation of power plants and gas storage facilities.

  • Effective Cooling and Heating

    Because GHP uses the heat arising from generating the engine, its warming-up period is short; and even if the external temperature is low, GHP can reach the desired temperature in a short period of time. GHP uses waste heat from the engine for heating; therefore, despite a drop in the external temperature during extremely cold weather, it has a low decrease in performance. Also, as heat exchange of refrigerants and coolants occurs separately through heat evaporation, heating can be continuously implemented for long periods of time as there is no need to remove the frost created on the external heat exchanger.

  • Quiet and Pleasant to Operate

    Noise and vibration are minimized with the installation of a large low-noise fan, and the lowest levels of indoor noise (31-45 dB) among all coolers and heaters are demonstrated.

  • Cheap Maintenance

    GHP uses cheap gas as its main energy source for cooling and heating, and can therefore reduce maintenance expenses by up to 20-30% for electricity cooling and heating. (During cooling, a separate fee system is applied.)

  • Minimizes Electricity Fees through Low Energy Consumption

    The energy required to operate a GHP is equivalent to 1/10 of the energy used to operate an electric air conditioner. Therefore, GHP is capable of not only minimizing electricity fees but also reducing installation fees, as it does not require additional equipment.

  • Efficient Use of Space

    Indoor units are installed on ceilings, whereas outdoor units are installed on rooftops. Therefore, installation of a machine room, cooling tower, chemical pipes, water processing facilities, etc. is not required. In addition, 16 indoor units can be connected to one outdoor unit, thus reducing the space required to install outdoor units.

What Is CNG?

The Compressed Natural Gas (CNG) Refueling System supplies natural gas, which is then compressed and used to charge natural gas cars using a refueling charger.

Background of Introduction

The government is trying to reduce the increasing severity of air pollution caused by the increasing number of cars and to protect the environment by introducing the most optimal alternative of changing all city buses to natural gas vehicles.

CNG Refueling Diagram
CNG Refueling Diagram : City gas pipe > Compressor > Supply control panel > Storage equipment > Refueling charger > Bus refuel
CNG Refueling Diagram
Components Details
Compressor Supplies city gas through pipes and compresses it to 250 bars
Supply control panel Distributes compressed gas to storage equipment and refueling chargers
Storage equipment Temporarily stores compressed gas at 250 bars or provides it to cars
Refueling charger Decompresses the compressed gas to 200 bars and measures and supplies it to buses