New (an New (and d old) old) Stu Bowns Stu B ns Insp Inspec - - PowerPoint PPT Presentation

Stu B Stu Bowns ns HYD HYDROM OMAX USA USA 859 859-512 512-7878 7878

Mi Michigan WEA Collect higan WEA Collections ions Seminar Seminar Octobe October r 1, 20 1, 2009 09

New New (an (and d old)

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Insp Inspec ecti tion

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Tec echn hnolog

• logies

ies

• History

History

• Flow

low Met Metering ring

• Zoom

Zoom Came Camera ras s (Manh (Manhole Insp

• le Inspec

ection tions) s)

• Fo

Focu cused sed El Elec ectro trode de Le Leak ak Lo Loca cation tion (FELL (FELL)

• CCTV

CCTV In Insp spection tion

• La

Late tera ral In l Inspe spect ction ion

• Si

Side de Scan Scan CCT CCTV

• La

Larg rge Diamete e Diameter r Pi Pipe pe Insp Inspec ection tion (Came (Camera ra/L /Lase aser/ r/Sona Sonar) r)

• What’s Next

Mic ichigan higan WE WEA A Collections Collections Sem emina inar October ctober 1, 1, 2009 2009

After we started sewer systems, the need for inspection and cleaning quickly arose. The beginning of sewer line inspection was not with CCTV, but rather a primitive test which was only really capable of finding infiltration or a failure of the so called inspection method. First holes used to access the collection systems were referred to as lamp holes. Only large enough to lower a lamp which was used to see if light would appear at the other end. Later years the candle was dragged from one manhole to another by floating a thin line, such as a fishing line downstream with the flow and then retrieving it at the downstream hole. The thread was used to allow the operator to later pull a sled or a wagon on which the candle was

• placed. It was felt that, if the candle would still be lit at the far end if there was not a problem

with the line. If infiltration occurred, then it was thought that the candle would be extinguished. This of course also remained true if the candle went past a lateral with flow, or rolled over during the inspection also. At the end of the day, the operator would have a simple set of data which showed if a line passed or failed. A failure usually meant a re-inspection. If an actual failure did indeed occur the operator still had no idea where in the line the infiltration occurred.

Lamp-hole Designs Source: The Designing, Construction, and Maintenance of Sewerage Systems, by H. Prescott Folwell, 1901

Source: www.sewerhistory.org

Mic ichigan higan WE WEA A Collections Collections Seminar eminar Octo ctober ber 1, 1, 200 2009

Source: www.sewerhistory.org

Mic ichigan higan WE WEA A Collections Collections Seminar eminar Octo ctober ber 1, 1, 200 2009

Mic ichigan higan WE WEA A Collections Collections Seminar eminar Octo ctober ber 1, 1, 200 2009

Mic ichigan higan WE WEA A Collections Collections Seminar eminar Octo ctober ber 1, 1, 200 2009

TECHNOLOGY TO CONSIDER

• Primary Device

– Flume – Weir – Venturi

• Level (Depth)

– Pressure transducer – Ultrasonic

• Velocity

– Doppler – Radar – Range gated doppler

WHAT, WHY , HOW ACCURATE, HOW LONG, WHO IS USING INFO

FL FLOW W METERI RING

FL FLOW W METERI RING

Even with the accuracy of today’s equipment and the ability to look at real time data, site visits are necessary to insure accurate data.

Flow Debris Depth Velocity Depth Flow (in) (FPS) (in) 3 2 Calculated 3.25 2 11% Low 3 2.25 13% Low 3 2 0.5 8% High 6 2 Calculated 6.25 2 4% Low 6 2.25 11% Low 6 2 0.5 3% High

8-inch Line

Flow Debris Depth Velocity Depth Flow (in) (FPS) (in) 4 2 Calculated 4.25 2 9% Low 4 2.25 13% Low 4 2 0.5 5% High 16 2 Calculated 16.25 2 2% Low 16 2.25 13% Low 16 2 0.5 1% High 22 2 Calculated 22.25 2 1% Low 22 2.25 9% Low 22 2 0.5 1% High

24-inch Line

FL FLOW W METERI RING

• Allows you to see up to 75 feet in

8” lines

• Can see more than 100 feet in

larger lines

• Helps determine if cleaning is

needed in association with Preventative Maintenance

• Helps prioritize where more

detailed inspection is necessary

ZOOM CAM CAMERAS RAS

• Acceptance testing for new sanitary sewers
• Identify pipe defects including potential sources of infiltration

and exfiltration (driven by flow monitoring data)

FE FELL LL SYSTEM

CCT CCTV V INSPECT CTION

CCT CCTV V INSPECT CTION

• CCT

CCTV V INSPECT CTION

CCT CCTV V INSPECT CTION

Laterals comprise up to 50% of a municipalities collection system Faulty laterals can be significant sources of I/I Structural problems can lead to basement flooding and loss of service Locate cause of backups to determine financial responsibility Cross bores from other utilities

LA LATERAL RAL INSPECT CTIONS

Lateral camera is attached to a mainline camera Mainline camera used to position smaller lateral camera Lateral camera launched into the service line Mainlines can range from 8” to 48” Probe used in laterals from 3” to 6” View up to 80 feet in the lateral

LA LATERAL RAL INSPECT CTIONS

SIDE DE SCAN CAN INSPECT CTION

12-inch, Re-enforced Concrete “Un-wrapped” Side Scan Image Frontal view

• Frontal view identifies what appears to be a severely deteriorated

joint in need of repair

• The unwrapped side scan image identifies an intact joint with only

superficial surface defects. No repairs needed!

SIDE DE SCAN CAN INSPECT CTION

SIDE DE SCAN CAN INSPECT CTION

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

THE PROBLEMS:

• Illumination
• Image clarity
• Bypass pumping
• Personnel safety
• Data

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

ABOVE THE WATER SURFACE WITH LASER AND HIGH DEFINITION IMAGING

• Laser identifies loss of pipe wall from corrosion
• Laser calculates ovality
• Laser calculates deflection versus design
• HD Images

BELOW THE WATER SURFACE WITH SONAR

• Sonar determines lost capacity by calculating

debris levels and volumes

• Major structural anomalies

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

9 inches

• f silt

Sonar of a 30-inch line

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

Each brick face can easily be seen and the mortar loss between each brick can be measured. 42” 32” Typical characteristics of an egg shaped brick sewer. Less mortar loss near the water level, getting worse towards the invert.

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

Below the water line in a brick sewer shows the resolution that is achievable with sonar.

The invert condition can be seen using sonar under the cctv camera.

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

Enables inspection with minimum lighting requirements Measurement of the exact shape of the conduit Locate and measure the magnitude & location of deformations Identification of connection location and position

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

• HD Image, Laser and Sonar data

continuously collected

• Sewers >30 inches in diameter
• Bypass pumping is not needed
• Capable of performing

continuous inspections for more than a mile

• Easy to interpret data

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

• Laser data collected 12x per second
• Sonar readings taken 1x per second
• HD Images captured 6x per second

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

LAR LARGE DI DIAM AMETER P R PIPE INSPECT CTION

WHAT’S NEXT

A SENSOR THAT CAN IMAGE OUTSIDE THE PIPE WALL TO IDENTIFY VOIDS AND PIPE THICKNESS

• There are numerous technologies used to

investigate the collection system

• No one tool identifies all the problems
• New and emerging technologies are available to

provide better data

Mic ichigan higan WE WEA A Collections Collections Sem emina inar October ctober 1, 1, 2009 2009

THANK YOU – QUESTIONS? Stu.Bowns@HydromaxUSA.COM