In-Service Forcemain Condition Assessment

Size: px

Start display at page:

Download "In-Service Forcemain Condition Assessment"

Melinda Mills
6 years ago
Views:

1 In-Service Forcemain Condition Assessment Tim Ross and Reid McDougall TRENCHLESS TECHNOLOGY ROADSHOW May 28-29, 2014 Scotiabank Convention Centre, Niagara Falls, ON

2 Agenda Project background & planning EM assessment of CPP C301 (PCCP) and C303 (BWP) Planning and execution Calibration exercise Project results Conclusions & recommendations

3 Project Background Flow reversal project in 2012 CH2M Hill and the City of Calgary 2 forcemains flowing north Southbound flow considered Project criteria Condition assessment of the forcemains Forcemains must remain in service during inspections AWWA C 301 and C 303 Pipe Project / Logistical Considerations Tool insertion Tool retrieval Pipeline details plans Maintaining sufficient flow Identification of inline valves Tool tracking during inspection

4 Project Planning Total inspection: 12,096 m 750 mm diameter FM Mostly PCCP and BWP twinned section of HDPE Constructed 1985 and 1993 Flow reversal in consideration of moving flow to Pine Creek WWTP

5 Concrete Pressure Pipe C 301(L) C 303 Signs of Deterioration Leaks Prestressing Wire Breaks Bar Breaks Internal Cracking Delamination Corroded Steel Cylinder

6 EM Primer Exciter Coil Current creates a magnetic field Prestressing Wires Magnetic field from the exciter induces a current in the prestressing wires Detector Coil The current in the prestressing wires creates a magnetic field which induces a current in the detector coil Amplitude: The strength of the detector signal Phase: The time that it takes for the signal to go from the Exciter to the Detector Signal is sensitive to pipeline properties (wire spacing, diameter, cylinder thickness, etc ) Signals are compared against a baseline signal for similar pipes. Simulated wire breaks and cylinder damage are used to create a calibration curve

module Neutrally buoyant uses flexible fins Flexible body

7 PipeDiver Inspection Platform Free swimming tool Battery module Remote field transformer coupling module Tracking module Neutrally buoyant uses flexible fins Flexible body design Insertion under live or temporary depressurized conditions

8 Tool Insertion Anderson L/S Insertion at Anderson Lift Station Plug Valve Removed and PipeDiver Insertion

9 Tool Insertion Fish Creek WWTP Plug Valve to be Removed for PipeDiver Insertion

10 Inspection Tool Tracking A total of 12,096 m inspected 1,605 pipe segments Leap frog tracking teams ~1 hour from Anderson LS ~3 hours from Fish Creek

11 Tool Extraction Bonnybrook Forcemain Discharge Channel Tool Removed

12 Tool Extraction Bonnybrook Eager Anticipation! Despair Sets In!

13 Tool Extraction Bonnybrook Unknown interconnect chamber in the gravity main Tool Located on Private Property inside Interconnect Chamber Tool Extraction

14 Inspection Results Pipeline Diameter (mm) Pipe Type No. of Inspected Pipes Pipes with Wire or Bar Breaks Pipes with Cylinder Defect Anomalous Pipes # % # % # % Anderson Force Main 750 LCP 1, Fish Creek Force Main 762 BWP Total 1, km of PCCP C301 L pipe (Canron 1985) 5 km of BWP C303 pipe (Ameron 1993) Calibration Historical data used for 750 mm PCCP Custom pipe manufactured for 762mm BWP by Hanson Pipe & Precast Manufactured to nearly identical specifications Pipe Diameter Class Cylinder Thickness (mm) Wire Gauge (mm) Wire Spacing (mm) Calibration Pipe 762 mm N/A Fish Creek Force Main 762 mm

15 Calibration Data Progressive damage created to quantify EM data from the inspection Simulated up to 35 bar breaks at the middle window Simulated up to 40 bar breaks at the joint window Cylinder defects machined into cylinder

16 Calibration Data Simulation of 0 to 35 bar breaks at the middle window Simulation of 0 to 40 bar breaks at the joint window

17 Calibration Data Cylinder defects machined into the cylinder (30% to 35% cylinder loss) 5 X 10 at middle window 7 X 12 at joint window Third window simulated three coupon sizes 1X1 inch 3X3 inch 5X5 inch

18 Detailed Results Anderson Forcemain (PCCP) Rank Pure Ref # MK # STA Pipe length (m) Pipe Class Break Position (m) # WB by Region 1 41 STD STD STD STD STD Total #WB 5 pipes with wire breaks Pure Ref # MK # STA Pipe length (m) Pipe Class Signal Positional Range (m) 755 STD pipe with any cylinder defect

19 Detailed Results Fish Creek Forcemain (BWP) Item # Pure Ref # Piece # STA Pipe length (m) Pipe Class Break Position (m) # BB by Region Total #BB 2 pipes with bar breaks Pure Ref # Piece # STA Pipe length (m) Pipe Class Signal Positional Range (m) 18 18B pipe with measured cylinder defect

20 Results Summary Anderson FM (PCCP) 0.8% damage Fish Creek FM (BWP) 0.5% damage Pipeline Length (m) Pipes with 5 WB/BB Pipes with 10 to 15 WB/BB Pipes with >15 WB/BB # % # % # % Anderson Force Main 7, Fish Creek Force Main 4, Total 12, Both in excellent overall condition No pipes with >15 wire breaks / bar breaks No verifications or repairs were undertaken

21 Conclusions & Recommendations Both forcemains are in excellent overall condition Of the 1,022 pipes inspected in the Anderson FM, there are a total of 5 pipes with prestressing wire break damage and 1 pipe with cylinder defect Of the 583 pipes inspected in the Fish Creek FM, there are a total of 2 pipes with bar break damage, and 1 pipe with cylinder defect Structural evaluation was recommended to determine MAOP Periodic monitoring through re inspection or continuous monitoring would be appropriate to track deterioration

22 Further Technology Development Added functionality to the technology platform EM resolution on PipeDiver platform increased through the addition of detector petals Dependent on pipe diameter

23 Thank You For more information, please contact: Tim Ross: Reid McDougall: Or visit our website

Acoustic Fiber Optic Monitoring of PCCP and Pipelines of Other Materials. Stewart Day, Pure Technologies

Acoustic Fiber Optic Monitoring of PCCP and Pipelines of Other Materials Stewart Day, Pure Technologies 1 Presentation Outline PCCP Common failure modes Metallic pipe failure modes PCCP & metallic pipe