In systems with slight pressure on the walls, welded pipes are used, for pipelines with high pressure — seamless, or whole. Basically used directly — and spiral -shovel, as well as water and gas pipeline structures made of ordinary carbon steel. For oil — and gas pipelines operating in conditions of large temperature differences, pipes made of high -quality thick -lobed steel are used. For grocery pipelines with aggressive solutions, stainless steel grades are used, and underground water intakes are equipped with casing seamless and drill metal rolled.
