Lessons Learned Archive

Overpressure and/or Unintended Loss of Pressure

Source	Asset	Type of Work	PDF
Near Miss / Good Catch	Service	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 2
Pipeline Safety Incidents (enter through use of .pdf F 7100-1)	Main	Construction	Overpressure and/or Unintended Loss of Pressure - 4
Pipeline Safety Incidents	Instrumentation and Electrical	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 7
Pipeline Safety Incidents	Customer Meter Regulator Relief Vent Cap	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 9
Pipeline Safety Incidents	Main	Construction	Overpressure and/or Unintended Loss of Pressure - 10
Internal QA Finding	Service	Construction	Overpressure and/or Unintended Loss of Pressure - 14
Near Miss / Good Catch	Valve (excluding regulator/control valves)	Construction	Overpressure and/or Unintended Loss of Pressure - 19
Pipeline Safety Incidents	Main	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 21
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 22
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 24
Pipeline Safety Incidents	Service	Construction	Overpressure and/or Unintended Loss of Pressure - 27
Near Miss / Good Catch	Main	Construction	Overpressure and/or Unintended Loss of Pressure - 28
Pipeline Safety Incidents	Main	Construction	Overpressure and/or Unintended Loss of Pressure - 30
Pipeline Safety Incidents	Main	Construction	Overpressure and/or Unintended Loss of Pressure - 42
Near Miss / Good Catch	Valve (excluding regulator/control valves)	Construction	Overpressure and/or Unintended Loss of Pressure - 50
Near Miss / Good Catch	Valve (excluding regulator/control valves)	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 52
Pipeline Safety Incidents	Inside Meter	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 54
Near Miss / Good Catch	Meter	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 55
Pipeline Safety Incidents	Main	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 58
Pipeline Safety Incidents	Service	Construction	Overpressure and/or Unintended Loss of Pressure - 62
Pipeline Safety Incidents	Outside Meter	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 70
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 75
Pipeline Safety Incidents	Main	Construction	Overpressure and/or Unintended Loss of Pressure - 82
Pipeline Safety Incidents	Main	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 83
Pipeline Safety Incidents	Main	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 84
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 88
Pipeline Safety Incidents	Main	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 93
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 94
Pipeline Safety Incidents	Service	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 96
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 100
Pipeline Safety Incidents	Service	Construction	Overpressure and/or Unintended Loss of Pressure - 101
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 104
Pipeline Safety Incidents	Service	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 112
Pipeline Safety Incidents	Service	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 114
Pipeline Safety Incidents	Main	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 126
Pipeline Safety Incidents	Main	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 129
Pipeline Safety Incidents	Main	Construction	Overpressure and/or Unintended Loss of Pressure - 130
Pipeline Safety Incidents	Wall Pipe	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 131
Pipeline Safety Incidents	Main	Operations & Maintenance	Overpressure and/or Unintended Loss of Pressure - 133

Damage Prevention (Excavation, Weather and Outside Force)

Source	Asset	Type of Work	PDF
Near Miss / Good Catch	Regulator Station	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 3
Pipeline Safety Incidents	Main	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 11
Pipeline Safety Incidents	Service	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 12
Regulatory Audit	Main	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 16
Near Miss / Good Catch	Main	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 37
Pipeline Safety Incidents	Service	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 41
Pipeline Safety Incidents	Service	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 43
Pipeline Safety Incidents	Main	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 46
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 48
Near Miss / Good Catch	Service	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 49
Near Miss / Good Catch	Service	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 53
Pipeline Safety Incidents	Inside Piping	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 63
Pipeline Safety Incidents	Service	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 64
Pipeline Safety Incidents	Service	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 65
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 67
Pipeline Safety Incidents	Main	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 68
Pipeline Safety Incidents	Service	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 69
Pipeline Safety Incidents	Service	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 71
Pipeline Safety Incidents	Test Point	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 79
Pipeline Safety Incidents	Main	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 86
Pipeline Safety Incidents	Steel Service	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 92
Pipeline Safety Incidents	Main	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 98
Pipeline Safety Incidents	Service	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 102
Pipeline Safety Incidents	Main	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 105
Near Miss / Good Catch	Main	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 108
Pipeline Safety Incidents	Service	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 109
Pipeline Safety Incidents	Main	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 111
Pipeline Safety Incidents	Service	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 115
Pipeline Safety Incidents	Main	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 118
Pipeline Safety Incidents	Main	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 119
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 120
Pipeline Safety Incidents	Main	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 121
Pipeline Safety Incidents	Service	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 123
Pipeline Safety Incidents	Service	Construction	Damage Prevention (Excavation, Weather and Outside Force) - 124
Pipeline Safety Incidents	Main	Operations & Maintenance	Damage Prevention (Excavation, Weather and Outside Force) - 128

Valve Operations and Maintenance

Source	Asset	Type of Work	PDF
Pipeline Safety Incidents (enter through use of .pdf F 7100-1)	Valve (excluding regulator/control valves)	Operations & Maintenance	Valve Operations and Maintenance - 5
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	Valve Operations and Maintenance - 6
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	Valve Operations and Maintenance - 17
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	Valve Operations and Maintenance - 51
Pipeline Safety Incidents	Main	Operations & Maintenance	Valve Operations and Maintenance - 57
Pipeline Safety Incidents	PRE START UP SAFETY REVIEW	Operations & Maintenance	Valve Operations and Maintenance - 59
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	Valve Operations and Maintenance - 95
Pipeline Safety Incidents	Main	Construction	Valve Operations and Maintenance - 99
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	Valve Operations and Maintenance - 106
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	Valve Operations and Maintenance - 116

Materials, Equipment and Tools

Source	Asset	Type of Work	PDF
Safety Alert	Main	Operations & Maintenance	Materials, Equipment and Tools - 8
Near Miss / Good Catch	Main	Construction	Materials, Equipment and Tools - 26
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	Materials, Equipment and Tools - 66
Near Miss / Good Catch	Material / Equipment / Tools	Operations & Maintenance	Materials, Equipment and Tools - 80

Corrosion Control

Source	Asset	Type of Work	PDF
Pipeline Safety Incidents	Main	Operations & Maintenance	Corrosion Control - 13
Pipeline Safety Incidents	Main	Construction	Corrosion Control - 87
Near Miss / Good Catch	Service	Operations & Maintenance	Corrosion Control - 107

Customer Meter / Regulator Installation and Inspection

Source	Asset	Type of Work	PDF
Pipeline Safety Incidents	Meter	Operations & Maintenance	Customer Meter / Regulator Installation and Inspection - 15
Near Miss / Good Catch	Inside Piping	Construction	Customer Meter / Regulator Installation and Inspection - 18
Pipeline Safety Incidents	Meter	Operations & Maintenance	Customer Meter / Regulator Installation and Inspection - 56

Gate/Regulator Station Operations and Maintenance

Source	Asset	Type of Work	PDF
Near Miss / Good Catch	Regulator/Control Valves	Operations & Maintenance	Gate/Regulator Station Operations and Maintenance - 20
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	Gate/Regulator Station Operations and Maintenance - 25
Pipeline Safety Incidents	Gas Transmission Pre Start Up Safety Review Not Completed for All Assets	Operations & Maintenance	Gate/Regulator Station Operations and Maintenance - 39
Pipeline Safety Incidents	regulator station damage	Operations & Maintenance	Gate/Regulator Station Operations and Maintenance - 60

Pipe Joining / Fusion Workmanship

Source	Asset	Type of Work	PDF
Pipeline Safety Incidents	Main	Operations & Maintenance	Pipe Joining / Fusion Workmanship - 23
Pipeline Safety Incidents	Tap Fitting	Construction	Pipe Joining / Fusion Workmanship - 38
Pipeline Safety Incidents	Main	Construction	Pipe Joining / Fusion Workmanship - 40
Pipeline Safety Incidents	Tap Fitting	Construction	Pipe Joining / Fusion Workmanship - 44
Pipeline Safety Incidents	Main	Operations & Maintenance	Pipe Joining / Fusion Workmanship - 61
Pipeline Safety Incidents	Main	Construction	Pipe Joining / Fusion Workmanship - 72
Pipeline Safety Incidents	Tap Fitting	Construction	Pipe Joining / Fusion Workmanship - 73
Regulatory Audit	Main	Construction	Pipe Joining / Fusion Workmanship - 89
Near Miss / Good Catch	Service	Construction	Pipe Joining / Fusion Workmanship - 113
Pipeline Safety Incidents	Tap Fitting	Construction	Pipe Joining / Fusion Workmanship - 127

Leak Detection (Including reduction and minimization)

Source	Asset	Type of Work	PDF
Pipeline Safety Incidents	Main	Operations & Maintenance	Leak Detection (Including reduction and minimization) - 29
Near Miss / Good Catch	Customer-owned piping	Operations & Maintenance	Leak Detection (Including reduction and minimization) - 33
Pipeline Safety Incidents	Main	Operations & Maintenance	Leak Detection (Including reduction and minimization) - 81
Pipeline Safety Incidents	Service	Operations & Maintenance	Leak Detection (Including reduction and minimization) - 85
Pipeline Safety Incidents	Main	Construction	Leak Detection (Including reduction and minimization) - 110
Pipeline Safety Incidents	Main	Operations & Maintenance	Leak Detection (Including reduction and minimization) - 125

Uprates

Source	Asset	Type of Work	PDF
Pipeline Safety Incidents	Inside Meter	Construction	Uprates - 31
Pipeline Safety Incidents	Service	Construction	Uprates - 32

Welding Practices

Source	Asset	Type of Work	PDF
Near Miss / Good Catch	Main	Construction	Welding Practices - 36
Internal QC Finding	Main	Construction	Welding Practices - 103

Work Zone and Excavation Safety

Source	Asset	Type of Work	PDF
Pipeline Safety Incidents	Main	Operations & Maintenance	Work Zone and Excavation Safety - 45
Near Miss / Good Catch	Service	Construction	Work Zone and Excavation Safety - 47
Pipeline Safety Incidents	Main	Operations & Maintenance	Work Zone and Excavation Safety - 74
Near Miss / Good Catch	Electric Pole	Construction	Work Zone and Excavation Safety - 90
Safety Alert	Meter	Operations & Maintenance	Work Zone and Excavation Safety - 91
Pipeline Safety Incidents	Main	Operations & Maintenance	Work Zone and Excavation Safety - 97
Pipeline Safety Incidents	Main	Operations & Maintenance	Work Zone and Excavation Safety - 117
Pipeline Safety Incidents	Service	Operations & Maintenance	Work Zone and Excavation Safety - 122

Lessons Learned Archive

Overpressure and/or Unintended Loss of Pressure​

Damage Prevention (Excavation, Weather and Outside Force)​

Valve Operations and Maintenance​

Materials, Equipment and Tools​

Corrosion Control ​

Customer Meter / Regulator Installation and Inspection ​

Gate/Regulator Station Operations and Maintenance ​

Pipe Joining / Fusion Workmanship​

Leak Detection (Including reduction and minimization)​

Uprates​

Welding Practices ​

Work Zone and Excavation Safety​

Overpressure and/or Unintended Loss of Pressure

Damage Prevention (Excavation, Weather and Outside Force)

Valve Operations and Maintenance

Materials, Equipment and Tools

Corrosion Control

Customer Meter / Regulator Installation and Inspection

Gate/Regulator Station Operations and Maintenance

Pipe Joining / Fusion Workmanship

Leak Detection (Including reduction and minimization)

Uprates

Welding Practices

Work Zone and Excavation Safety