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mcinco50,
Your question is way too general for a simple answer. Piping has many facets.
Industry Sector:
Well Head, Off-Shore, Pipeline, Refinery, Petrochemical, Chemical, Water Treatment, Food Processing, Pharmaceutical, Hydraulics, Ship Building, Rocket Engine, etc.
Groups:
Leadership/Management/Supervision(Department or Project), Piping Material Engineering, Piping Material Control/Logistics, Plant Layout/Piping Design, Pipe Stress Engineering, Pipe Fabrication Shop Engineering, Field Piping Engineering, Valve Engineering