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Detroit Water and Sewerage DepartmentDepartment
Sewer Collection SystemSewer Collection System Maintenance and Rehabilitation
UpdateUpdate
Samuel A Smalley PESamuel A. Smalley, PE
Assistant Director Asset Maintenance Group
Sewer Collection System Maintenance and R h bili i U dRehabilitation Update
• DWSD sewer collection system overviewoverview
• Sewer maintenance improvements• Rehabilitation program for sewer collection systemcollection system
• CIPP Process
Asset Maintenance GroupAsset Maintenance Group
• Mechanical Maintenance Division (236 FTE)Mechanical Maintenance Division (236 FTE)
• Maintenance and Repair Division (326 FTE)
i i j i li b i li• Engineering – Major Pipeline, Urban Pipeline, and Planning (9 FTE)
• Responsible for all water mains, sewer mains, water booster stations, sewer lift stations, DWSD owned buildings, and 900+ vehicle and construction equipment fleet
Detroit Sewer Collection SystemDetroit Sewer Collection System
• 3 400 miles of sewer system piping3,400 miles of sewer system piping
• 2,300 miles of lateral sewers
3 lif i i i• 13 sewer lift stations in Detroit
• 78 outfalls to Detroit River and Rouge River
• 9 drainage districts in Detroit
• 4 maintenance yards4 maintenance yards
DWSD SEWER SERVICE AREA
Detroit Sewer Pipe Class and LengthDetroit Sewer Pipe Class and Length
Type of Sewer Typical Sizes Lengthyp yp g
Total 3,383 miles
Lateral 6 to 24 inches 2,258 miles
Connector 24 to 48 inches 559 miles
Trunk 48 to 60 inches 483 milesTrunk 48 to 60 inches 483 miles
Interceptor Large diameter 83 miles
DWSD Large Diameter SewersDWSD Large Diameter Sewers
9 DETROIT SEWER DISTRICTS
Detroit Section Maps – Water and Sewer
DWSD MaintenanceDWSD MaintenanceDistricts
Sewer System Maintenance Improvements
Sewer System MaintenanceSewer System Maintenance
• Refurbished (11) and replaced (3) vactors( ) p ( )• Factory training for fleet mechanics• Current fleet – 26 vactors and 1 Super Sucker• Purchase and deployment of better equipment , tools, and nozzles – rotating jet nozzles, root kits, metal detectors pole camera rebuilt sewer videometal detectors, pole camera, rebuilt sewer video truck
• Engaging employees at all levels of the g g g p yorganization – increased training and seek out input and bright ideas
Sewer System MaintenanceSewer System Maintenance
• Eliminate roadblocks to productionEliminate roadblocks to production
• Moved many employees back to day shift
Q /QC d l i i f• QA/QC – random sample inspections of rodding with pole camera and video truck
• Management by walking around
• Carrot and stick for overtime work
• Establish useful metrics and measure performanceperformance
Rotating Jet NozzleRotating Jet Nozzle
AMG Performance ScorecardMaintenance & Repair Division 2009‐10
Catch Basins Cleaned / RepairedCombined Yards
1,200
1,400
ers
Catch Basin Work Orders (New)
Catch Basin Work Orders (Completed)
Catch Basins Goal
(Approx. 90,000 in System Goal Rep.>1% or .006)
907
816
698756
801
889
764800
1,000
mbe
r of W
ork
Ord
e
Backlog of Catch Basin WOs, measured in total number of open Wos
331
790
487
573
600
491382
349
501
371
515
371
513
353
581
424
495
400
600
Nu
544445
331
269163
51
487
240
459 390328 186115
90 267
371359
200
400
91
0Jul 09 Aug 09 Sep 09 Oct 09 Nov 09 Dec 09 Jan 10 10-Feb Mar 10 Apr 10 May 10 Jun 10 Jul 10
NOTE: Total Work Orders = Previous Month's Backlog of Work Orders + This Month's New Work Orders
Lateral Sewer Rodding/CleaningLateral Sewer Rodding/Cleaning
• 2007 – 40 miles
• 2008 75 miles• 2008 – 75 miles
• 2009 – 105 miles
• 2010 – on pace to hit 400+ miles
• Goal is to clean 700 miles annually
AMG Performance ScorecardMaintenance & Repair Division 2009‐10
60Sewer Rodding/Combined Yards
50Leng
t
h
30
40
cle
a
n
20
e
d
in
m
10
mil
e
s
0
Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul2010
MAINTENANCE & REPAIR CENTRAL YARDPERFORMANCE SCORE CARD
140
160
180
d
Catch Basins Cleaned or Repaired Maintenance & Repair: Central Yard-2009-10
2
3n
mil
es
Sewer Rodding Maintenance & Repair Central Yard-2009-10
0
20
40
60
80
100
120
Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul
nu
mb
er o
f jo
bs
com
ple
ted
2009 2010
0
1
1
2
Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul
Len
gth
cle
aned
in
2009 2010
20
25
30
lete
d
Number of Mains Repaired by DWSD Personnel Maintenance & Repair: Central Yard-2009-10
200
250
300
mp
lete
d
Number of Services Repaired or Installed Maintenance & Repair: Central Yard-2009-10
0
5
10
15
Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul
nu
mb
er f
o j
ob
s co
mp
2009 2010
0
50
100
150
Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul
nu
mb
er o
f jo
bs
com
2009 2010
YARD TO YARD COMPARISON
EAST YARD
100
120
140
160
d
Catch Basins Cleaned or Repaired Maintenance & Repair Yard to Yard Comparison - July 2010
NORTH YARD
WEST YARD600
700
800
900
Number of Services Repaired or Installed Maintenance & Repair Yard to Yard Comparison - July 2010
CENTRAL YARD EAST YARD
WEST YARD
20
25
Number of Mains Repaired by DWSD Personnel Maintenance & Repair - Yard to Yard Comparison
July 2010
EAST YARD
30.0
35.0
40.0
45.0
es
Sewer Rodding Maintenance & Repair Yard to Yard comparison - July 2010
CENTRAL YARD ,0
NORTH YARDWEST YARD
0
20
40
60
80
100
num
ber
of jo
bs c
ompl
eted
CENTRAL YARD
EAST YARD
0
100
200
300
400
500
num
ber
of jo
bs c
ompl
eted
NORTH YARD
0
5
10
15
num
ber
of jo
bs c
ompl
eted
CENTRAL YARD NORTH YARD
WEST YARD
0.0
5.0
10.0
15.0
20.0
25.0
Len
gth
cle
aned
in
mile
Geographical Information Systems
DWSD Sewer RehabilitationDWSD Sewer Rehabilitation ProgramProgram
Sewer Rehabilitation UpdateSewer Rehabilitation Update
• Contractor based CIP programp g• Lining, pipe bursting, open cut replacement, and slip lining options – CIPP primary option
• Current rehabilitation program started 1996• 264 miles of sewer lined since early 1980’sI t t t d i fl d i filt ti i• Intent to reduce inflow and infiltration, improve customer service, reduce maintenance issues, increase system capacity without expansiony p y p
• Current Contract – 3 years $80 million contract with Inland Waters Pollution Control
CONTRACT # SEWER CLEANED SEWER LINED
Linear Foot Miles Linear Foot Miles
CS-963 8,990 1.7 8,990 1.7
CS 1164CS-1164 20,100 3.8 20,100 3.8
CS-1215 22,190 4.2 22,190 4.2
CS-1256 46,230 8.8 46,230 8.8
CS-1325 157,885 29.9 130,956 24.9
CS-1368 825,490 156.4 797,558 151.1
DWS-864 241,474 45.8 200,500 38.0
DWS-865 222,244 42.1 165,575 31.4
DWS-876 63,003 12.0 Ongoing Ongoing
DWS-877 81,905 15.6 Ongoing Ongoing
TOTALS 1,689,511 320.3 1,392,099 263.9
CIPP – 4’6” Brick SewerCIPP 4 6 Brick Sewer
CIPP – 4’6” Brick SewerCIPP 4 6 Brick Sewer
CIPP – 4’6” Brick SewerCIPP 4 6 Brick Sewer
CIPP – 4’6” Brick SewerCIPP 4 6 Brick Sewer
Before 9 Days Later
Outfall CIPP Rehabilitation
CIPP – Technical EnvelopeCIPP Technical EnvelopeDiametersDiameters 8” to 108”8” to 108”Effluent TemperatureEffluent Temperature Up to 130Up to 130°° FFpH RangepH Range 1.0 to 10.01.0 to 10.0Pipe ConditionPipe Condition Fully / Partially Fully / Partially
DeterioratedDeterioratedBends and TurnsBends and Turns Up to 90Up to 90°°Offset JointsOffset Joints YesYesDiameter ChangesDiameter Changes YesYesInstall Length*Install Length* Up to 1200’ Up to 1200’ gg ppHost Pipe MaterialHost Pipe Material All MaterialsAll Materials
* Depends on Diameter
CIPP Material MakeupCIPP – Material Makeup• LinerLiner
– Polyester Needle Felt Tube w/ Polyurethane Coating
– Thickness Designed to Structural Requirements– Container for Resin
• Resin System– Polyester, Vinyl Ester, or Epoxy Resin– Catalyst used to accelerate curing– Colored Dye added to assure resin saturation
CIPP Design CalculationsCIPP – Design Calculations• Design Parameters Based on ASTM F1216Design Parameters Based on ASTM F1216
– Pipe Condition– Pipe Diameterp– Pipe Ovality– Ground Cover– Water Table– Live Loads– Flexural Modulus
CIPP ProcessCIPP ‐ Process
• Clean and Inspect via CCTV prior to liningClean and Inspect via CCTV prior to lining
• Manufacture custom sized liner (i.e. wet‐out)
ll i b i• Install Liner by Inversion
• Cure Liner (Steam or Hot Water)
• Cut Ends and Reinstate Laterals
• Final Inspection and Report completed byFinal Inspection and Report completed by CCTV
Wet‐outImpregnated LinerPinch Point
Wet‐out
Resin Slug Roller Bedg
Liner InstallationLiner InstallationPreparing Liner Fasten Liner to ColumnImpregnated Liner
Liner InstallationLiner InstallationAir Inversion Water InversionImpregnated Liner
Impregnated LinerTower
Curing g
Water Cure
Steam Cure
Cut Liner EndsCut Liner EndsCutting Liner End at
ManholeCut Liner End
Manhole
Lateral ReinstatementLateral Reinstatement
Final TVFinal TV
Existing Pipe
Relined Pipe
Quality ControlQuality Control
– Progress Meetings
Wet Out– Wet Out
– Inspection• Inspector Training• Inspector Training
• Testing
• Cook LogsCook Logs
• Liner Samples
• Post Inspection
CIPP T hl O C tCIPP – Trenchless vs. Open‐Cut
• JointlessJointless– eliminates infiltration, exfiltration, root intrusion
• Less ‐intrusive construction– Minimal ground repair, relieves environmental concerns
• Minimal Public Disruptionp– Reduced traffic congestion and social costs
• Installation productivity gains– Reduced Construction Time
CIPP P f Th h P fCIPP – Proof Through Performance
• Millions of LF installed World‐WideMillions of LF installed World Wide
• Inert material with indefinite life
S l i i h i d fl i• Structural pipe with increased flow capacity
• Applicable to a variety of pipe conditions, diameters, and locations
• Custom designed to meet conditions specifiedg p
Q i ?Questions?
Samuel A. Smalley, PEAssistant Director – Asset Maintenance GroupDetroit Water and Sewerage Department
