Lessons Learned Archive Having trouble? View documents here. Corrosion Control Customer Meter and Regulator Installation & Inspection Damage Prevention (Excavation, Weather and Outside Forces) Gate and Regulator Station Operation and Maintenance Leak Detection Materials, Equipment and Tools Over pressurization and/or Unintended Loss of Pressure Pipe Fusion and Workmanship Uprates Valve Operations and Maintenance Welding Practices Work Zone and Excavation Safety