The IGGI dataset is a collection of open source European gas transport data produced by SciGRID_gas team. The data set contains geographical and meta information on the European gas transport network. The data results from the merged data sets of INET_raw, GIE, GSE and IGU data and heuristic process to fill missing parameter values. It contains data about 69.000 km of European transport pipeline network as well as storages, production, lng terminals, entry points, interconnection points and compressors.
You can download the dataset and the documentation of IGGI from Zenodo