Method of operating an internal combustion engine and corresponding arrangement

A method of operating an internal combustion engine specified to be run with a fuel gas mixture having a maximum specified hydrogen content, the fuel gas mixture comprising at least one hydrocarbon and hydrogen, the method comprising:

• withdrawing a pipeline gas from a pipeline, the pipeline gas comprising at least one hydrocarbon and hydrogen wherein the hydrogen content of the pipeline gas exceeds the maximum specified hydrogen content,
• subjecting at least a part of the pipeline gas to a hydrogen depletion to yield a hydrogen depleted gas mixture not exceeding the maximum specified hydrogen content, and
• using at least a part of said hydrogen depleted gas mixture as the fuel gas mixture for the internal combustion engine,
• wherein said hydrogen depletion includes a membrane separation, and
• before said pipeline gas is subjected to the hydrogen depletion, subjecting at least a part of said pipeline gas to a heating step, when a temperature of the pipeline gas is determined to be below a specified temperature, using an indirect fired or bath heater, wherein said heating step is controlled using (i) a temperature of a liquid bath of the indirect fired heater or of the bath heater and (ii) a temperature of a stream from the hydrogen depletion.