Preparing Your Agency for an Electro Scan Water CIPP Certification Field Demonstration

Transcription

1 Preparing Your Agency for an Electro Scan Water CIPP Certification Field Demonstration January 2016

2 Water Lining Defects Are Typically Missed by CCTV. Electro Scan Is Now Being Recommended For CIPP Lining QA/QC. ASTM F1216 (2008) and F1743 (2009) continue to recommend visual inspection of Cured-In-Place Pipe (CIPP); but, newer technologies, like Electro Scanning Inspection or Low Voltage Conductivity, ASTM F2550 (2013) now is most cited, in addition to the draft AWWA M77 Water Main Condition Assessment, Standards of Practice recommended to find defects not found by missed by CCTV) inspection. 1

3 *** IMPORTANT NOTICE *** Field Demonstrations are a resource intensive, time consuming, & expensive Service that is provided at No Charge, except for a city s or county s responsibility to provide a water jet truck, permitting, and traffic control. Scheduled on a first-come, first served basis, priority is given to water utilities that have included at a minimum language in its bid specification that has reserved the right to utilize new assessment techniques that have become generally accepted by the water industry or pipe inspection market. 2

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5 The recommended timing for Electro Scanning Testing -- to properly certify water main lining projects -- is at least one (1) hour after lining, utilizing the same entry/exit pits. 4

6 And, After Liner End-Sealing has been Finalized. 5

7 Electro Scanning: The Basics 1. What Does Electro Scan Do, That CCTV Cannot? Answer: Find and measure defects in pre- and post-rehabilitated sewer and water pipes. Electro Scan automatically locates and estimates the amount of defect flows in gallons per minute (liters per second) caused by defects at joints, service connections, cracks, and poorly installed CIPP linings. Electro Scan can also certify newly installed, recently repaired and rehabilitated pipe lining projects as leak free and can work year around, in dry or wet weather. 2. How Does It Work? Liners are made of non-conductive materials (e.g. felt, woven hose, epoxy resins, membranes ), so no electrical current should ever be able to leak or escape into the ground from inside the liner via either direct leak or via the metallic host pipe, unless, of course, there is a defect or compromise in the liner. Electro Scan s patent-pending technology releases a focused array of low-voltage high-frequency electrical current that locates and quantifies all defects. 3. Who Has Endorsed or Used Electro Scan? Electro Scan has been endorsed by the USEPA with its inclusion in the Seventh Edition Operations and Maintenance of Wastewater Collection Systems, Volume 1 (2015). Electro Scan is also the only company with products in compliance with ASTM Standard F

8 Low Voltage Conductivity Systematically Evaluates 360-degrees of CIPP Pipe Wall Field Set-Up Low voltage current represents 40 ma or about 4 AA batteries, posing no threat to workers or customers. ASTM F A Water Main Does Not Require to be Full of Water -- Only Enough to Surround the Probe. Water Quantity is Equivalent to a Light Cleaning. 7

9 Electro Scan Inc. Recommends Three (3) Low Voltage Surveys 1. Pre-CIPP 2. Post-CIPP 3. Post-Service Reinstatement However, For Field Demonstrations Purposes it is Recommended That Electro Scanning Be Done Post-CIPP, but Pre-Service Reinstatement for One (1) or More Pipe Segments. 8

10 A. No Leakage Example Liner Defects That Leak Leak-Free CIPP Electrical Current Shows Zero Exits of Spikes from Inside Main to Ground. B. Leakage Leak Leak Leak CIPP Severe Defect Flows Identified With Low Voltage Conductivity CIPP Defects Not Recorded By Closed-Circuit Television Inspection 9

11 1. Recommended Pipe Selection Pipe Diameter from 6 to 10 for efficient demonstrative purposes and time constraints, timed for post-cipp survey. Pipe Lengths from 100 (minimum) to 500 (maximum). Low traffic area for safety and control. Additional helpful pipe selection criteria which helps demonstrate Electro Scan s features and benefits: Pipes with questionable liner installation. Pipe are pre- and post-cipp televised, with at least one pipe with Zero CCTV defects. Any maps of the distribution system in that area, including lengths, sizes, and materials. Please have available your CCTV videos (mp4 or Windows-media compatible file format) available at the job site or immediately afterward to allow side-by-side side-by-side comparison. 10

12 2. Equipment Needs We request your Agency provide: Any required traffic control o Electro Scan trucks are equipped with flashing directional arrows, strobes, and cones. Anything above and beyond required by the local municipality will need to be provided. Jet or Combo Truck, plus operators with: o o A full tank of water General cleaning nozzle (only needed to propel hose up the pipe) Proper Trench Conditions o o Trench shoring and access per OSHA regulations Dewatering equipment and operation (if necessary) Any Necessary Temporary Risers and Fittings o If Electro Scan s dual funnel cone cannot be utilized to maintain the proper amount of water around the probe due to pipe conditions such as grade, ovality, diameter reductions, etc it may be necessary to surcharge the pipe by attaching temporary 90 degree fittings and risers. 11

13 3. Scheduling Oftentimes we can perform demos at two or more locations in a given day morning and afternoon. Senior Managers should be on hand for both our in-office executive summary and onsite demonstration, should results indicate that an immediate Change Order is warranted in order to QA/QC the remainder of the project. Once scan is completed (in many cases in less than 30 minutes) it is saved to a laptop equipped with the Electro Scan application, and if Internet or WiFi connection is available, will be uploaded directly to the Electro Scan cloud, Results can often be viewed in minutes at the site. We typically like to spend a half-hour at the beginning of the demo giving an explanation of the equipment and procedures. This is often done at the office or shop, but can also be done on location. Actual scans, including mobilization, set-up, and removal, typically takes about an hour to 45 min minutes or so per pipe. 12

14 Official Specifications A. ASTM F The focused electrode current data may be processed to grade the variations of the focused electrode current values into those that represent small, medium, and large pipe leaks according to the maximum amplitude of focused electrode current. The apparatus manufacturer should be consulted regarding the relationship between focused electrode current and pipe leak size and classification. Detected leaks maybe classified into those that are likely to be due to pipe joints or other types of pipe leaks resulting from faulty service connections or pipe cracks by associating focused electrode current maxima that occur at regular location intervals with pipe joints. It is recommended that separate scanning tests be taken before and after any pipe repair, relining, or renewal activity to compare electrode current values, and for closed-circuit television (CCTV) video to re-examine pipes to determine if any visual defects were missed or not recorded during initial examination. 13

15 Official Specifications B. Office of Water Programs Post-CIPP Assessment Sixth Edition ,000 copies In print. Seventh Edition Released Dec Electro Scanning Inspection Pages Traditionally, CCTV inspection has been the primary method of inspecting postrehabilitation projects, such as relining, in a typical cured-in-place pipe (CIPP) installation and assessment (Figure 4.41). However, since the objective is to deliver a leak.free project, other methods should be used to ensure that projects are delivered without new or potential sources of infiltration. Water or air pressure tests may be used (see Chapter 6 for more information); although if segments fail the pressure tests, the specific locations of defects are not defined by these tests. As there are no joints in lined pipes, the two greatest weaknesses of CIPP and other lining materials are either at the service reconnection or any material defect in the liner. One of the benefits of electro scanning is the repetitive trace patterns produced by the data that assists operators in defining the nature and type of defects. When electro scanning is used, separate scans should be taken before and after any pipe repair, relining, or rehabilitation activity to compare electrode current values and to determine if any visual defects were missed during initial assessment. Electro scanning data should be compared to available CCTV inspection data to calibrate defect locations with service connections and other pipe features. 14

16 Official Specifications C. AWWA M77 Standards of Practice - Draft c. Low Voltage Conductivity method DRAFT to be distributed at AWWA Annual Conference & Exposition, June

17 Official Specifications AWWA Manual M77: Condition Assessment of Water Mains - DRAFT Chapter 6: Leak Detection b. Low Voltage Conductivity Testing When to Use Water agencies, consulting engineers, and contract managers can use low-voltage, electric resistivity testing as part of their overall condition assessment programs. By providing quantitative data, the technology can help assess deteriorating pipelines and prioritize rehabilitation. Additionally, using low-voltage, electric resistivity testing can also help system operators significantly change their acceptance criteria for rehabilitated pipes. Water rehabilitation methods - such as water main point repairs, relined pipes, and new pipe installations have typically been assessed using either 1) visual inspection techniques which often have difficulty identifying small defects that can leak, or 2) air or hydrostatic pressure tests, which provide a pass / fail result with no way of identifying where the leak is. When feasible, it is recommended that separate scanning tests be taken before and after any pipe repair, relining, or renewal activity to compare results. 16

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