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Gas trains

Design and function

Natural gas trains for burners installed on boilers and furnaces can be made based on the specific requirement by the user. Depending on the needed gas quantity, available inlet pressure, required outlet pressure, custom designs of gas trains are available.

Depending on the available inlet pressures, different concepts for gas train design is used. For higher gas consumption facilities, it is more common to use pressures in range of 1-6 bar, to avoid large diameters of pipes and valves. In that case, it is necessary to use high pressure gas train which consist of ball valve on the inlet, cartridge filter, pressure regulator with safety shut of valve and safety relief valve.

After this high pressure gas train, the gas is prepared to enter the burner where appropriate air-gas mixture is made for efficient combustion. Depending on the burner construction, required pressures are in the range of 0.022 - 350 mbar or even more for some burners. For quality combustion it is important to have outlet pressure with constant value, even if the consumption and inlet pressure is changing. For safe work of high pressure gas trains, relief and shut valve are installed on the line. Shut off valve is regularly integrated in the same housing with pressure regulator.

If available gas pressure is not to high for use in burners directly, only low pressure gas train is needed. Low pressure gas train has set of equipment that include two solenoid shut off globe valves with tightness check system, pressure switch for high and low pressure, and pressure governor if required. All low pressure equipment is to be connected with burner automation system for safe and continues work.

If required gas meters can be integrated within gas train, or in more economic way, a place for gas meter can be left to enable easy combustion adjustment and after the combustion is adjusted, gas meter can be used on other places.

Technical data

For designing of gas trains several technical information are usually required:

Nominal sizeDN
Standard pressure categoriesPN
Ambient temperature range[OC]
Inlet pressure[bar]
Outlet pressure[bar]


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