westlake interceptor repair savings prove long- term success · city of westlake •founded in 1811...
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Westlake Interceptor Repair Savings Prove Long- Term
Success Presented by: Brad Boyer Watermark Engineered Product Sales, Inc.
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CITY OF WESTLAKE • FOUNDED IN 1811 • POPULATION-35,000 • 16 SQUARE MILES • 124 MILES OF STORM • 142 MILES OF SANITARY • ENGINEERING DEPT.
– DESIGN – CONTRACT ADMIN. – INSPECTION
Westlake
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INTRODUCTION NEIGHBORING CITY HAD AN
INTERCEPTOR SEWER COLLAPSE
“RCP” PIPE WAS ONLY 18 YEARS OLD
FLOODED OVER 40 HOMES
SETTLED LAWSUITS HAVE
EXCEEDED $560k THIS PROMPTED WESTLAKE TO
INVESTIGATE THE CONDITIONS OF OUR INTERCEPTOR
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WORST CASE SCENARIOS
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PROJECT LIMITS
THE INTERCEPTOR IS LOCATED ALONG THE NORTHERN LIMITS OF THE CITY
23,700 FEET LONG INTERCEPTOR
PIPE SIZE RANGES FROM 36”
TO 60” IN DIAMETER 63 MANHOLES ARE ALONG
THE INTERCEPTOR
ADWF – 6 MGD
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CONDITION ASSESSMENT
• URS CORPORATION, CLEVELAND, OH – EMERGENCY RESPONSE PLAN – CONDITION ASSESSMENT
• CCTV INSPECTION OF THE INTERCEPTOR
• MANHOLE INSPECTION • WORK WAS CONDUCTED IN 2007,
REPORT SUBMITTED IN 2008
• BUILT IN THE 60’S WITH NO ASSESSMENT CONDUCTED BEFORE
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INVESTIGATION-MANHOLES STRUCTURAL INTEGRITY
DEFECTS CORROSION
INFILTRATION GENERAL AS-BUILT INFO
GRADE RING AREA CASTING STEPS
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MAINLINE INSPECTION
OPERATIONAL AND MAINTENANCE ISSUES LEAKING JOINTS (I/I) CAPACITY REDUCING OBSTRUCTIONS DEBRIS IN PIPE
STRUCTURAL DEFECTS CRACKS & FRACTURES CORROSION (MIC) OPEN JOINTS
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HYDROGEN SULFIDE CORROSION
BACTERIAL GROWTH OCCURS ON RCP WITH A pH<7 CARBON DIOXIDE HYDROGEN SULFIDE
17 pH SWAPS TAKEN – MH INSPECTION
15 SITES – pH OF 5 2 SITES – pH OF 2
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MAINLINE FINDINGS
HYDROGEN SULFIDE CORROSION WAS SEEN IN THE FIRST 7 MANHOLE RUNS FROM THE TREATMENT PLANT. GRADE CHANGES 90 DEGREE BEND PROXIMITY TO
PLANT
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MAINLINE FINDINGS HYDROGEN SULFIDE CORROSION
WAS SEEN AT ALL MAJOR TRUNK LINES (6) DUE TO DROP MANHOLES 50’ +/- MANHOLE REMAINDER GOOD CONDITION
CLAGUE ROAD
COLUMBIA ROAD
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MAINLINE FINDINGS
CANTERBURY ROAD
CAHOON ROAD
DOVER CENTER ROAD
CROCKER ROAD
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MANHOLE FINDINGS
THE MAJORITY OF THE MANHOLES HAD INFILTRATION.
LARGE MINERAL DEPOSITS
EXISTED AT SOME MANHOLES FROM INFILTRATION.
HYDROGEN SULFIDE
CORROSION OCCURED AT DROP MANHOLES.
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MANHOLE FINDINGS
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REHABILITATION DESIGN
• CITY PERFORMED THE DESIGN – TRADE SHOWS & CONFERENCES – DISCUSSIONS WITH CONTRACTORS
• PERMANENT REPAIR TO CORRODED PIPE • PREVENT FUTURE CORROSION • PERIODIC CHEMICAL TREATMENTS NOT
CONSIDERED FOR HYDROGEN SULFIDE CONTROL
• TARGET AREAS OF REHABILITATION - NOT ENTIRE PIPE LENGTH, WHICH WERE 550’
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CIPP OPTION • CURED IN PLACE PIPE WAS FIRST
THOUGHT OF AS A REHABILITATION OPTION.
• PARTIAL LINERS FOR THIS DIAMETER PIPE NOT FEASIBLE. ONLY LINE MH TO MH.
• CIPP OTHER COSTLY DRAWBACKS – MANHOLE CONE REMOVAL – PIPE HAD SIZE REDUCTIONS
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CCCP CENTRIFUGALLY CAST CONCRETE
COATING IS APPLIED WITH A ROTATING SPIN CAST NOZZLE
USED VERTICALLY HORIZONTAL
ANTIMICROBIAL ADDITIVE IS DOSED
INTO THE MIX TO RENDER THE COATING UNINHABITABLE FOR BACTERIA GROWTH, WHICH STOPS THE CORROSION. ConShield® from CONSHIELD
TECHNOLOGIES INCORPORATED IN THE MIX
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CCCP
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CCCP
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REHABILITATION PROJECT 2009-2010 1.6 MILLION DOLLARS UNITED SURVEY INC. OF CLEVELAND, OHIO
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REHABILITATION PROJECT • CLEANING • REHABILITATION
– CCCP – CIPP (TRUNK LINES)
• MANHOLE REHABILITATION
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BY-PASS - Pumping
REHABILIATION OCCURRED UNDER FULL BY-PASS
12 MGD CAPACITY RAIN EVENT COULD
CAUSE THE FLOW RATE TO INCREASE 5 FOLD
PUMP WATCHMAN VARIOUS SET-UPS
WERE REQUIRED AT EACH TRUNK LINE
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CCCP PREP WORK ORGANIC MATTER AND
DETERIORATED PIPE WERE CLEANED
- HIGH PRESSURE WATER - HIGH PRESSURE AIR - ACTIVE LEAKS SEALED - CONSHIELD RINSE APPLIED TO
KILL ANY ACTIVE BACTERIA
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CCCP REHABILITATION
TWO MOBILE BATCH PLANTS USED
SPIN CAST MIX PERMACAST PL-8000 –
DRY MIX CONSHIELD WATER AP/M PERMAFORM
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CCCP REHABILITATION SPIN CASTER
AIR LINE PRODUCT LINE
OPERATOR AT SPIN CASTER
TO CONTROL APPLICATION RATE
WINCH OPERATOR NEAR
MANHOLE TO CONTROL RETRIVAL SPEED OF SPIN CASTER
ID / CURING COAT APPLIED
LATER
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CCCP TEST RESULTS
• COMPRESSIVE STRENGTH TESTING • ASTM C 109 • FLOW WAS RESUMED UNDER 24 HOURS
WITH A MINIMUM 2,300 PSI BREAK
1 DAY 2 DAY 3 DAY 28 DAY
AVG. BREAK (PSI) 3,160 4,865 6,246 8,037
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CCCP REHABILITATION
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2010 COST SAVINGS
SIZE OF PIPE
DISTANCE FT (CCCP)
DISTANCE FT (CIPP)
CCCP UNIT $
CIPP UNIT $
CCCP COST CIPP COST
60" 562 2,119 $280.00 $420.00 $157,360.00 $889,980.00
60" 102 105 $214.00 $420.00 $21,828.00 $44,100.00
48" 75 952 $258.00 $336.00 $19,350.00 $319,872.00
42" 2,821 2,853 $173.00 $294.00 $488,033.00 $838,782.00
36" 401 1,184 $241.00 $252.00 $96,641.00 $298,368.00
TOTALS 3,961 7,213 $783,212.00 $2,391,102.00
TOTAL SAVINGS $1,607,890.00
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POST INSPECTION
VARIOUS PORTIONS OF THE INTERCEPTOR WERE FILMED THIS YEAR
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CONCLUSION
TARGET REHABILITATION APPROACH SAVES MONEY
CCCP ANOTHER TOOL FOR REHABILITATION COMPREHENSIVE ASSESSMENT WAS KEY TO
SUCCESSFUL PROJECT COMMUNICATION VITAL IN THE INDUSTRY
WITH EXCHANGE OF KNOWLEDGE
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THE END!