Pipeline Failure Investigation Report - PHMSA - U.S. Department of ...

Pipeline Failure Investigation Report
Pressure @ Time of Failure @ Failure Site
N/A
Pressure @ Failure Site: 795 psig at the Houstonia Station Elevation @ Failure Site: 660
Pressure Readings @ Various Locations:
Direction from Failure Site
Location/M.P./Station # Pressure (psig) Elevation (ft msl) Upstream Downstream
N/A
Type of Product:
Specific Gravity:
Pressure @ Time of Failure (4)
High Pressure Set Point:
Specific Gravity: .55
Pressure @ Time of Failure (4) 795 psig
High Pressure Set Point: 830 psig
Upstream Pump Station Data
API Gravity:
Flow Rate:
Distance to Failure Site:
Low Pressure Set Point:
Upstream Compressor Station Data
Flow Rate:
Distance to Failure Site: 21.6 miles
Low Pressure Set Point:
N/A
N/A
Operating Pressure
Max. Allowable Operating Pressure: 800 psig
Determination of MAOP: 192.619 (c)
Actual Operating Pressure: 795 psig
Method of Over Pressure Protection: Engine safeties - first engine speed and torque, then shutdown.
Relief Valve Set Point: 830 psig Capacity Adequate? Yes No
Integrity Test After Failure
Pressure Test Conducted in place? (Conducted on Failed Components or Associated Piping): Yes No
If NO, Tested after removal? Yes No
Method: N/A
Describe any failures during the test.
N/A
N/A
Soil/water Conditions @ Failure Site
Condition of and Type of Soil around Failure Site (Color, Wet, Dry, Frost Depth): Dry and very rocky
N/A
Type of Backfill (Size and Description): Rock
4 Obtain event logs and pressure recording charts
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Form 11 Pipeline Failure Investigation Report (Revised 03/07/08)