Detroit Water and Sewerage Department
Sewer Collection System Sewer
Collection System
Maintenance and Rehabilitation Update
Samuel A. Smalley, PE
Samuel
A Smalley PE
Assistant Director Asset Maintenance Group
Sewer Collection System Maintenance and R h bili i U d
Rehabilitation Update
• DWSD sewer collection system overview
• Sewer maintenance improvements
• Rehabilitation program for sewer collection system
collection system
• CIPP Process
Asset Maintenance Group
Asset Maintenance Group
• Mechanical
Mechanical Maintenance Division (236 FTE)
Maintenance Division (236 FTE)
• Maintenance and Repair Division (326 FTE)
• Engineering –
i
i
Major Pipeline, Urban Pipeline, j
i li
b
i li
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 System
Detroit Sewer Collection System
•
•
•
•
•
•
3,400 miles of sewer system piping
3
400 miles of sewer system piping
2,300 miles of lateral sewers
13 sewer lift stations in Detroit
3
lif
i
i
i
78 outfalls to Detroit River and Rouge River
9 drainage districts in Detroit
4 maintenance yards
4 maintenance yards
DWSD SEWER SERVICE AREA
Detroit Sewer Pipe Class and Length
Detroit Sewer Pipe Class and Length
Type of Sewer
yp
Typical Sizes
yp
Total
Length
g
3,383 miles
Lateral
6 to 24 inches
2,258 miles
Connector
24 to 48 inches
559 miles
Trunk
48 to 60 inches
48 to 60 inches
483 miles
483 miles
Interceptor
Large diameter
83 miles
DWSD Large Diameter Sewers
DWSD Large Diameter Sewers
9 DETROIT SEWER DISTRICTS
Detroit Section Maps – Water and Sewer
DWSD Maintenance
DWSD
Maintenance
Districts
Sewer System Maintenance Improvements
Sewer System Maintenance
Sewer 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 video
metal detectors, pole camera, rebuilt sewer video truck
• Engaging employees at all levels of the g g g
p y
organization – increased training and seek out input and bright ideas
•
•
•
•
Sewer System Maintenance
Sewer System Maintenance
• Eliminate
Eliminate roadblocks to production
roadblocks to production
• Moved many employees back to day shift
• QA/QC –
Q /QC random sample inspections of d
l i
i
f
rodding with pole camera and video truck
• Management by walking around
• Carrot and stick for overtime work
• Establish useful metrics and measure performance
Rotating Jet Nozzle
Rotating Jet Nozzle
AMG Performance Scorecard
Maintenance & Repair Division 2009‐10
Catch Basins Cleaned / Repaired
Combined Yards
(Approx. 90,000 in System Goal Rep.>1% or .006)
1,400
Catch Basin Work Orders (New)
Catch Basin Work Orders (Completed)
Nu mber of Work Orde
ers
1,200
Catch Basins Goal
Backlog of Catch Basin WOs, measured in total number of open Wos
1,000
907
889
816
801
800
764
756
698
790
600
600
581
513
491
573
424
382
353
515
501
371
495
349
400
371
487
331
544
445
359
186
328
459
390
115
200
267
90
269
163
51
240
0
Jul 09
Aug 09
Sep 09
Oct 09
Nov 09
Dec 09
Jan 10
NOTE: Total Work Orders = Previous Month's Backlog of Work Orders + This Month's New Work Orders
10-Feb
91
Mar 10
Apr 10
May 10
Jun 10
Jul 10
Lateral Sewer Rodding/Cleaning
Lateral Sewer Rodding/Cleaning
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•
•
•
•
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 Scorecard
Maintenance & Repair Division 2009‐10
60
L
e
n
g
t
h
Sewer Rodding/Combined Yards
50
40
c
l
e
a
n
e
d
i
n
m
i
l
e
s
30
20
10
0
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
2010
Jun
Jul
MAINTENANCE & REPAIR CENTRAL YARD
PERFORMANCE SCORE CARD
Sewer Rodding Maintenance & Repair Central Yard2009-10
Catch Basins Cleaned or Repaired Maintenance &
Repair: Central Yard-2009-10
3
180
160
Length cleaned in
n miles
2
number of jobs completed
d
140
2
1
120
100
80
60
1
40
20
0
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
0
2010
2009
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
2009
Number of Mains Repaired by DWSD Personnel
Maintenance & Repair: Central Yard-2009-10
Number of Services Repaired or Installed Maintenance
& Repair: Central Yard-2009-10
300
30
250
number of jobs com
mpleted
25
number fo jobs completed
Jul
2010
20
15
200
150
100
10
50
5
0
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
2009
0
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
2010
Jul
2010
2009
YARD TO YARD COMPARISON
Sewer Rodding Maintenance & Repair Yard to Yard
comparison - July 2010
Catch Basins Cleaned or Repaired Maintenance &
Repair Yard to Yard Comparison - July 2010
160
Number of Mains Repaired by DWSD Personnel
Maintenance & Repair - Yard to Yard Comparison
July 2010
Number of Services Repaired or Installed Maintenance
& Repair Yard to Yard Comparison - July 2010
25
900
EAST YARD
45.0
EAST YARD
CENTRAL YARD
140
EAST YARD
40.0
800
NORTH YARD
20
120
35.0
700
WEST YARD
WEST YARD
15
80
NORTH YARD
60
40
10.0
WEST YARD
10
NORTH YARD
5
number of jobs completed
15.0
600
100
number of jobs completed
20.0
number of jobs completed
d
Length cleaned in mile
es
WEST YARD
30.0
25.0
500
400
300
200
CENTRAL YARD
20
5.0
CENTRAL YARD
0.0
100
NORTH YARD
CENTRAL YARD ,0
0
EAST YARD
0
0
Geographical Information Systems
DWSD Sewer Rehabilitation DWSD
Sewer Rehabilitation
Program
Sewer Rehabilitation Update
Sewer Rehabilitation Update
• Contractor based CIP program
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• 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’s
• Intent to reduce inflow and infiltration, improve I t tt
d
i fl
d i filt ti
i
customer service, reduce maintenance issues, increase system capacity without expansion
y
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
8,990
1.7
8,990
1.7
20,100
3.8
20,100
3.8
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
CS-963
CS 1164
CS-1164
CS-1215
CIPP – 4
CIPP 4’6”
6 Brick Sewer
Brick Sewer
CIPP – 4
CIPP 4’6”
6 Brick Sewer
Brick Sewer
CIPP – 4
CIPP 4’6”
6 Brick Sewer
Brick Sewer
CIPP – 4
CIPP 4’6”
6 Brick Sewer
Brick Sewer
Before
9 Days Later
Outfall CIPP Rehabilitation
CIPP – Technical Envelope
CIPP Technical Envelope
Diameters
Effluent Temperature
pH Range
Pipe Condition
Bends and Turns
Offset Joints
Diameter Changes
g
Install Length*
Host Pipe Material
* Depends on Diameter
8” to 108”
Up to 130
130°° F
1.0 to 10.0
Fully / Partially
Deteriorated
Up to 90
90°°
Yes
Yes
Up
p to 1200’
All Materials
CIPP Material Makeup
CIPP –
Material Makeup
• Liner
– 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 Calculations
CIPP –
Design Calculations
• Design Parameters Based on ASTM F1216
Design Parameters Based on ASTM F1216
– Pipe Condition
– Pipe Diameter
p
– Pipe Ovality
– Ground Cover
– Water Table
– Live Loads
– Flexural Modulus
CIPP Process
CIPP ‐
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Clean and Inspect via CCTV prior to lining
Clean
and Inspect via CCTV prior to lining
Manufacture custom sized liner (i.e. wet‐out) Install Liner by Inversion
ll i
b
i
Cure Liner (Steam or Hot Water)
Cut Ends and Reinstate Laterals
Final Inspection and Report completed by
Final Inspection and Report completed by CCTV
Wet‐out
Pinch Point
Resin Slugg
Impregnated
Liner
Roller Bed
Liner Installation
Liner Installation
Preparing Liner
Impregnated Liner
Fasten Liner to Column
Liner Installation
Liner Installation
Air Inversion
Impregnated Liner
Water Inversion
Tower
Impregnated Liner
Curing g
Water Cure
Steam Cure
Cut Liner Ends
Cut Liner Ends
Cutting Liner End at
Manhole
Cut Liner End
Lateral Reinstatement
Lateral Reinstatement
Final TV
Final TV
Existing
Relined
Pipe
Quality Control
Quality Control
– Progress Meetings
– Wet Out
Wet Out
– Inspection
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•
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•
Inspector Training
Inspector
Training
Testing
Cook Logs
Cook Logs
Liner Samples
Post Inspection
CIPP Trenchless vs. Open‐Cut
CIPP –
T
hl
O
C t
• Jointless
– eliminates infiltration, exfiltration, root intrusion
• Less ‐intrusive construction
– Minimal ground repair, relieves environmental concerns
• Minimal Public Disruption
p
– Reduced traffic congestion and social costs
• Installation productivity gains
– Reduced Construction Time
CIPP Proof Through Performance
CIPP –
P f Th
hP f
Millions of LF installed World
Millions
of LF installed World‐Wide
Wide
Inert material with indefinite life
S
Structural pipe with increased flow capacity
l i
i hi
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i
Applicable to a variety of pipe conditions, diameters, and locations
• Custom designed to meet conditions specified
g
p
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•
Q
Questions?
i ?
Samuel A. Smalley, PE
Assistant Director – Asset Maintenance Group
Detroit Water and Sewerage Department