ASSET MANAGEMENT WATER MAINS OWWA - OMWA

Transcription

1 ASSET MANAGEMENT WATER MAINS OWWA - OMWA Water department Drinking water branch City of Montreal Serge Martin Paul, P.Eng. M.Eng., Project manager

2 Presentation plan ASSET MANAGEMENT WATER MAINS Overview of the network Context Asset management plan Case study

3 OVERVIEW OF THE NETWORK The network map Population served: 1.8 M people 6 water treatment plants 14 reservoirs

4 OVERVIEW OF THE NETWORK Distribution areas

5 OVERVIEW OF THE NETWORK The Plan network s du réseau assets Total water lines: 5045 km Distribution lines: 4305 km Water mains: 740 km 2500 Valve chambers, main network Concrete cylinder Pipe: 320 km Precast concrete cylinder Pipe C-301: 140km Metal pipe: steel, cast or ductile iron: 280 km Without external protection: 110 km With external protection: 30 km

6 Statistiques Statistics OVERVIEW PORTRAIT OF DU THE RÉSEAU NETWORK Pipes diameters Average age of the steel pipes Average age of the cast iron pipes Average age of the concrete pipes Total pipe length with a diameter 900 mm Total length of pipe with a diameter >900 mm et 1500 Total length of pipe with a diameter > 1500 mm 400 to 2700 mm 84 years 72 years 46 years 630 km 70 km 40 km

7 CONTEXT Issues and objectives Population growth, industrialization and an aging network are the key factors that pushed the city of Montreal to think about its role as a drinking water supplier The water fund creation in 2003 Adoption of the Montreal Charter of rights and responsibility in 2006 The City of Montreal commits to provide quality drinking water in sufficient quantity Montreal Water Strategy

8 MANAGEMENT PLAN GESTION DES ACTIFS Management cycle: inventory Water mains Valve chambers Inventory update

9 GIS: the visualization tools MANAGEMENT PLAN

10 Inventory MANAGEMENT PLAN PLAN DE GESTION Update TOTAL (m) ,00 Geo spatial data and pipe condition data Available documents # Pipe section Diam. (mm) Street From To Downtow n area Year of Length (m) installat ion Year of rehabilit ation Type of rehabil itation Material As built drawin gs Lay plans Key plans Tunnel - Servitude (Tréfonds) Tunnel - Servitude (Tréfonds) Réservoir Châteaufort Réservoir Châteaufort Atwater Centre A-40 (côté Nord) Usine Des Baillets n/a n/a n/a C-301-E A-206 Beauharnois n/a n/a n/a C-301-E A-205 Raccord 60'' (Atwater - Lymburner) OUI n/a n/a C-301-E A-179 A e/jarry n/a n/a n/a C-301-E A N-30, O-68 N-30 O-63 N-30

11 MANAGEMENT PLAN GESTION DES ACTIFS Management cycle: priorization Inventory update Water mains Valve Chambers Inspections priorization

12 Durée Materials de vie service life GESTION MANAGEMENT DES ACTIFS PLAN CONTEXTE MATERIALS SERVICE LIFE Materials Minimum Probable Maximum Steel Lined steel pipe Asbestos-cement Concrete cylinder pipe PCCP without external protection < PVC Cast iron between 1940 and 1965 Cast iron before 1940 and after 1965 Ductile iron 1979 and before Ductile iron after Lined cast iron Polyethylene C-301!!!

13 Defects by types of materials Problématiques par type de matériau MANAGEMENT PLAN MATERIALS COMMON DEFECTS Cast iron Ductile iron Steel Concrete cylinder pipe Precast concrete cylinder pipe, PCCP, C-301 Longitudinal, circomferential cracks X X Spiral cracks X X Pitting X X X X X Alteration of the concrete X X Cracks in the concrete X X Wire breaks X

14 MANAGEMENT PLAN Decision tree PCCP (C-301) 6 types of decisions (No action, inspection in 3 or 5 years, repair, rehab, replacement) 5 ratings Inspection data available? Spot repairs Water main break Diameter 400 mm New pipe for redundancy Can be inspected? Monitoring / Inspection Replacement 1 : Number of repairs 6 breaks or 2 :repair rate 2 breaks /km / year (according to hierarchy) Other projects? Service life 100% No action Service life 80% Concrete cylinder pipe PCP 1 : Number of repairs 6 breaks or 2 :Repair rate 2 breaks /km / year (according to hierarchy) Leak detection / inspection No action Replacement Leak detection / inspection Remplacement Service life 80% Other projects? No action Replacement Leak detection / Inspection

15 Decision tree: PCCP C-301 MANAGEMENT PLAN PCCP (C-301) 6 types of decisions (No action, inspection in 3 or 5 years, repair, rehab, replacement) 5 ratings Inspection data available? Spot repairs Water main break New pipe for redundancy Can be inspected? Monitoring / Inspection

16 Materials other than C-301 MANAGEMENT PLAN PCCP (C-301) Diameter 400 mm 1 : Number of repairs 6 breaks or 2 :repair rate 2 breaks /km / year (according to hierarchy) Service life 100% Replacement Other projects? No action Replacement Leak detection / inspection

17 MANAGEMENT PLAN Materials other than PCCP, C-301 PCCP (C-301) Diameter 400 mm Concrete cylinder pipe PCP Service life 80% 1 : Number of repairs 6 breaks or 2 :Repair rate 2 breaks /km / year (according to hierarchy) Leak detection / inspection No action Remplacement Service life 80% Other projects? No action Replacement Leak detection / Inspection

18 MANAGEMENT PLAN GESTION DES ACTIFS Management cycle: inspections Water mains Valve Chambers Inventory update Inspections Inspections priorizations

19 Résumé des divers types Types of inspection MANAGEMENT PLAN d inspection Electromagnetic inspection In-line acoustic leak detection Acoustic leak detection using correlator Visual internal and external inspection Acoustic monitoring (fiber optic)

20 Electromagnetic inspection MANAGEMENT PLAN Courtesy Pure Technologies

21 MANAGEMENT PLAN Inspection method by material INSPECTION METHODS Cast iron Ductile iron MATERIALS Steel Concrete cylinder pipe (PCP) Leak detection x x x x Visual internal and external inspeciton Electromagnetic inspection Acoustic monitoring Precast concrete cylinder pipe C- 301 x x x x x x x Courtesy Pure Technologies Hydrophones and acoustic correlators: Echologics

22 MANAGEMENT PLAN Valve chambers inspection Assigning a rating of 0 to 5 0. In excellent condition 1. Structure in good condition without visible presence of corrosion: To be re-inspected in 5 years 2. Stable structure with corroded elements: minor repairs needed 3. Moderately degraded structure requiring repairs in 1 to 3 years 4. Very damaged structure requiring a short-term intervention 5. Unstable structure requiring immediate action

23 MANAGEMENT PLAN Inspections results Valve chamber N-10-1 rating 1 Valve chamber O-12-4 rating 5

24 MANAGEMENT PLAN Leak detection and electromagnetic inspection ,49 Length in km ,03 5,4 10,28 4,83 11,96 3,62 7,63 7,67 4, ,65 1, Year Auscultation en km Détection de fuites en km inspected valve chambers

25 MANAGEMENT PLAN GESTION DES ACTIFS Management cycle: Repair, Rehab, Replacemnt Repair Rehabilitation Replacement Water mains Valve Chambers Inventory update Inspections Inspections priorization

26 Intervention Résumé des divers types MANAGEMENT PLAN d inspection Choose the type of intervention Target the intervention area Have an integrated planning Act at the right time = Better ressource management

27 Decarie Boulevard: Montreal CASE STUDY

28 Costs: 900 mm water main break Decarie Boulvard, April 2011 Police Traffic management $ Claims of citizens $ The break repair $ Social costs related to the closing of Decarie (2 weeks)? $ Support to the operation (city workers)? $ Total $ Inspection cost for 581 m of a 900 mm water main $ Cost of a planned repair $

29 CASE STUDY 2 Chemin de la Côte-Ste-Catherine Electromagnetic inspection Inspected length, October 2009 (from Darlington to Côte-des-neiges) 906 m Inspection cost $ Cost of spot repairs Total length replaced 87 m Replacement cost of 87 m $ Traffic control 3 weeks Replacement cost Total length to be replaced 906 m Replacement cost $ Traffic control for replacement 906 m 14 weeks

30 QUESTIONS?