Pipeline transport in order to avoid melting the frozen ground by hot petroleum which would result in sinking the pipeline in the ground. Maintenance of pipelines includes checking cathodic protection levels for the proper range, surveillance for construction, erosion, or leaks by foot, land vehicle, boat, or air, and running cleaning pigs, when there is anything carried in the pipeline that is corrosive. US pipeline maintenance rules are covered in Code of Federal Regulations(CFR) sections, 49 CFR 192 for natural gas pipelines, and 49 CFR 195 for petroleum liquid pipelines. In the US, onshore and offshore pipelines used to transport oil and
Central Europe Pipeline System European countries, known as the Northern European Pipeline System (NEPS). The pipeline system was founded in the late 1950s by NATO being funded as part of the NATO Common Infrastructure Program, with the various participating countries already having some of the infrastructure and capabilities required to operate such a system. In the 1980s, the pipeline was attacked several times by terrorist organizations. The Belgian communist terrorist organisation Communist Combatant Cells carried out five bombings against the pipeline on 11 December 1984, and one more attack on 6 December 1985. Earlier that year, in April 1985, a bomb attack was carried