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
Transalpine Pipeline It could be used to reverse the southern branch of the Druzhba pipeline to supply Slovakia. In Würmlach, Austria, the Adria-Wien Pipeline (AWP) branches off from the Transalpine Pipeline. It supplies the OMV refinery in Schwechat. Through the proposed Bratislava - Schwechat Pipeline it may supply also Slovakia. In addition to the sea transport, the Pan-European Pipeline, if constructed, will supply the Transalpine Pipeline. The diameter of the trunkline between Trieste and Ingolstadt is . Both sections starting from Ingolstadt are with in diameter. The pipeline has ten pumping stations. The pipeline system includes tank farms in Trieste and Lenting,