دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a weld made on a pipeline already in service. The gas from the line is purposely ignited at the point where the welding is to be done, thereby eliminating the chance that a spark could cause an explosion of gas and air.

n: a collective term for the construction tasks bypassed by regular crews on pipeline construction. Tie-in includes welding road and river crossings, valves, portions of the pipeline left disconnected for hydrostatic testing, and other fabrication assemblies, as well as taping and coating the welds.

n: workers responsible for tie- in tasks in the construction of a pipeline.