Sewer System Inspection: Techniques and Resources. Presented by: Doug Severson
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1 Sewer System Inspection: Techniques and Resources Presented by: Doug Severson
2 Sewer Inspection Why should you inspect a sewer system? Preserve critical assets Confirm system integrity Peace of mind Disaster avoidance
3 Sewer Inspection When should you inspect a sewer system? Conjunction with road or other utility projects After new installations to confirm quality Complaints/problems from users and/or downstream partners Have a proactive plan i.e., all the time as part of a complete maintenance program
4 Sewer Pipe Today Clay: good chemical/biological resistance; but easily cracked or quartered most common old material Brick/Mortar: common in large diameter old sewer; the mortar is what s susceptible to deterioration Concrete: good structural material; poor H 2 S resistance (pitting/deterioration) Storm Sewer Plastic: PVC/PE/HDPE newer technology; high chem resistance; flexible; good flow characteristics Steel/CMP: storm sewers/culverts; easily rusts; weld/joint issues; poorer flow regime; thinner design CIPP or HDPE Lining: good flow characteristics; no annular space or joints; Flexible to small changes in host pipe diameter
5 Typical Collection System
6 Sewer Inspection Sewer systems should be inspected for: Dirty - Blockages, Root Intrusion, Grease, Debris, Mineral Deposits
7 Sewer Inspection Sewer systems should be inspected for: Dirty - Blockages, Root Intrusion, Grease, Debris, Mineral Deposits Major Structural Issues - Cracks, Holes, Collapses, Significant Obstructions, Pipe Failure
8
9 Sewer Inspection Sewer inspection methods/techniques/ procedures: Man-entry Crawler (large/small diameter) Skids Floater LETS Push camera from cleanout/basement
10 Sewer Inspection CCTV Inspection Main Line man-entry Large diameter, usually greater than 48-inch Ventilation or self-contained breathing mechanisms
11 Sewer Inspection CCTV Inspection Main Line small and large diameter crawlers (under 48- inch diameter). Pictures courtesy of Aeries Industries, Inc.
12 Sewer Inspection CCTV Inspection Main Line skid systems When debris/access/etc. deny use of crawler Jet machine/truck required
13 Sewer Inspection CCTV Inspection Lateral Services from the main line LETS Lateral Evaluation Television System
14 Lateral Inspection
15 Visu-Sewer Clean & Seal, Inc. W230 N4855 Betker Road, Pewaukee, WI Tel.: (262) Fax: (262) Web: CITY OF RACINE CCTV Date 12/9/2003 Pipe Size 8 Pre-Cleaning Jetting Upstream MH TO191A Job Number 03254W-01 Material Reinforced Concrete Pipe Weather Dry Jt. Spacing 0 Surface Asphalt Location (Street) RACINE ST. Shape Circular US MH Depth 10.2 Downstream MH TO191 Flow Direction S DS MH Depth 10.5 Use of Sewer Sanitary Survey Direction Downstream Pipe Length Typical Sewer Inspection Report Media No. 03 Alt.Media No. Counter Start 1:24:09 Counter End 1:50:49 Surveyor RAUL M. LOPEZ Certificate No Comments SANITARY SEWER Ftg. Code Description Position Cont. Comment 0.0 AMH Access Point - Manhole MH-TO191A 0.0 DAE Deposits Attached: Encrustation 12 to 12 S TF Tap, Factory Made TF Tap, Factory Made TFC Tap, Factory Made: Capped TF Tap, Factory Made 9 HOLE IN TAP 43.0 TF Tap, Factory Made TF Tap, Factory Made TFC Tap, Factory Made: Capped TFC Tap, Factory Made: Capped TF Tap, Factory Made DAE Deposits Attached: Encrustation 7 to TF Tap, Factory Made TF Tap, Factory Made TFC Tap, Factory Made: Capped TFC Tap, Factory Made: Capped TFC Tap, Factory Made: Capped TFC Tap, Factory Made: Capped TFC Tap, Factory Made: Capped TF Tap, Factory Made TFC Tap, Factory Made: Capped TFC Tap, Factory Made: Capped TF Tap, Factory Made 3 DAE IN TAP DAE Deposits Attached: Encrustation 12 to 12 F01 AT JOINTS AMH Access Point - Manhole MH-TO191 Generated on Monday, 2/23/2004 at 11:38 AM by the PipeTech TV inspection system.
16 Sewer Inspection Other Information DVD/CD-ROM format available Preferable to videotape for ease of use/storage PACP certification requirements Look for an inspector who is PACP certified PACP = Pipeline Assessment and Certification Program developed by NASSCO Unified Nationwide abbreviations and codes so that logs and records can be used/reviewed/understood by any and all other contractors/municipalities
17 Sewer Inspection NASSCO = National Association of Sewer Service Companies NASSCO was assisted by the Water Research Centre (WRc) of the UK & Europe in deriving the PACP program. website:
18 Sewer Inspection PACP will: Eliminate confusion and save time Provide standard defect codes Enables standard data exchange format through the development of software Provide consistency of reporting/descriptions of defects Promote a standard of professionalism through certification
19 Sewer Inspection What is the Inspection/Televising Contractor looking for? Accessibility (easement vs. street) Length/Diameter No/Light/Heavy cleaning desired - Water Number of set-ups, locations Bypassing requirements Traffic Control requirements Working &/or completion date restrictions Above determines type of inspection equipment, labor requirements & timeline
20 Sewer Inspection Additional Inspection Techniques: Smoke Testing Manhole Inspections Dye Water Flooding
21 Smoke Testing Smoke Testing is the most cost effective method of I/I source investigation. Somewhat weather dependent Have to work with community closely Great for finding uncapped cleanouts, connected downspouts, and line/manhole defects (through cracks in pavement or seepage through grass)
22
23 Smoke Testing
24 Manhole Inspections MH inspection to check lids, frame, seals, chimney, corbel/cone, barrel, bench, all joints/connections Can be completed in conjunction with televising/smoke testing/dye flooding Don t have to enter the manhole Use approved/common inspection form
25 Manhole Inspections
26 Dye Water Flooding Especially important in areas where the storm sewer is in close proximity to the sanitary/process sewer (i.e. alongside or crosses over). Camera placed in sanitary/process sewer while storm sewer is flooded with water and inert dye color. Entry of dyed water into sanitary/process sewer is often noted at joints, laterals and defects.
27 Dye Water Flooding
28
29 Dye Water Flooding
30 Dye Water Flooding
31 Sewer Maintenance Goes Hand- in-hand with Inspection Why is sewer maintenance important? The single greatest asset of a municipality is their sewer system. Preventative vs Emergency A properly maintained system can save money by eliminating backups. Sewer maintenance methods / techniques.
32 Sewer Maintenance Jet Cleaning Jet cleaning uses 2000 psi water pressure to pull debris to downstream manhole. Debris may be removed by hand/bucket or left in manhole. Local (at the jobsite) access to water is very important for efficient work.
33 Sewer Maintenance Jet Cleaning Jet / Vacuum Cleaning The Vactor combines jet cleaning with debris removal. A dump site is required in addition to water access.
34 Sewer Maintenance Jet Cleaning Jet / Vacuum Cleaning Mechanical Rodding/Root Cutting
35 Sewer Maintenance Jet Cleaning Jet / Vacuum Cleaning Mechanical Rodding/Root Cutting Bucketing
36
37 Doug Severson
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