crossings through natural and manmade obstructions
1Gas linepipe — is a part of a gas trunkline, which unites gas compressor stations into a single gas transmission system to deliver gas from gas fields to gas consumers. A gas linepipe comprises a pipeline itself with branch lines, loops, shunts, control valves …
2Aboveground crossing — is a pipeline facilities complex for pipe laying through natural or manmade obstructions (ravines, minor rivers with steep shores, canals and irrigation ditches, mountain walker rivers, mine openings, landslides, permafrost soils, motorways and… …
