Newport Force Main Rehabilitation GLASS FIBER...

Newport Force Main Rehabilitation GLASS FIBER REINFORCED Project No. 5-60 CURED-IN-PLACE PIPE (GFR-CIPP) 15146-1B

Section 15146

GLASS FIBER REINFORCED CURED-IN-PLACE PIPE (GFR-CIPP)

PART 1 - GENERAL

1.1 GENERAL

A. This section presents requirements of the glass fiber reinforced cured-in-place pipe (GFR-CIPP) for rehabilitation of portions of the force main pipelines. The GFR-CIPP shall consist of a resin-impregnated flexible tube that is inverted into the existing force main pipeline and expanded to fit tightly against the host pipe by water cure. The resin system shall be cured by elevating the temperature of the fluid (water) used for the inflation to a sufficient enough level for the initiators in the resin to effect a full polymerization (hardening). The finished new pipe shall, after curing, be a monolithic fiber and resin composite matrix that will be chemically resistant to withstand exposure to domestic sewage.

1.2 RELATED WORK SPECIFIED ELSEWHERE

A. Compliance with the requirements of the Contract Documents including General Conditions, Special Provisions, and General Requirements.

B. The requirements of the following sections and divisions apply to the Work of this section. Other sections and divisions of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this Work.

1. Section 01120, Work Sequence

2. Section 01140, Work Restrictions

3. Section 01150, Permits

4. Section 01300, Contractor’s Construction Schedule and Reports

5. Section 01500, Temporary Facilities and Controls

6. Section 02200, Earthwork

7. Section 02761, Sewer Cleaning and Television Inspection

8. Section 02998, Standby Pumping Requirements at Bay Bridge Pump Station

9. Section 15065, High Density Polyethylene Pipe

1.3 REFERENCED STANDARDS

A. The following documents form a part of this specification to the extent stated herein and shall be the latest editions thereof. Where differences exist between codes and standards, the requirements of these specifications shall apply. All references to codes and standards shall be to the revised version.

1. American Society of Testing and Materials (ASTM):

ASTM D543 Evaluating the Resistance of Plastics to Chemical Reagents

ASTM D638 Tensile Properties of Plastics

ASTM D790 Flexural Properties of Unreinforced and Reinforced Plastics and Insulating Materials

ASTM D2990 Tensile, Compressive, and Flexural Creep and Creep-Rupture of Plastics

GLASS FIBER REINFORCED Newport Force Main Rehabilitation CURED-IN-PLACE PIPE (GFR-CIPP) Project No. 5-60 15146-2B

ASTM D3350 Polyethylene Plastics Pipe and Fittings Materials

ASTM D5813 Specification for Cured-In-Place Thermosetting Resin Sewer Pipe Systems

ASTM F1216 Rehabilitation of Existing Pipelines and Conduits by the Inversion and Curing of a Resin-Impregnated Tube

2. Standard Specification for Public Works Construction, “Greenbook” adopted by Joint Cooperative Committee of Southern California Chapter, American Public Works Association and Southern California Districts, Associated General Contractors of California.

1.4 QUALIFICATIONS

A. Submittals shall be in accordance with General Requirements section entitled “Shop Drawing Submittals” and the requirements of this Section.

B. For the key personnel responsible for GFR-CIPP work, the experience record shall include a listing indicating the most recent, successful projects completed demonstrating the required experience. The experience record shall include name of project, agency name including all contact information, lined pipe diameter and lengths, curing methods, type of lined pipe material, and total footage. If the GFR-CIPP work was performed as a subcontractor, the record shall include name of general contractor, name of contact and all contact information.

C. GFR-CIPP Superintendent, Foreman, and Lead Crew Personnel: Individuals responsible for the installation of GFR-CIPP in accordance with the Contract Documents shall have a minimum of three (3) projects of experience installing GFR-CIPP liners in pressure pipe of a similar size (30-inch to 36-inch diameter), length and configuration included in this Contract. The key personnel for the CCTV inspection, resin wet-out, the GFR-CIPP liner installation and liner curing must have a minimum of three (3) projects of experience with the pressure GFR-CIPP technology for this Contract and must have demonstrated competency and experience to perform the Work.

1.5 SUBMITTALS

A. The submittals shall be provided in accordance with the General Requirements.

B. A copy of this specification section, with addendum updates included, and all referenced and applicable sections, with addendum updates included, with each paragraph check-marked to indicate specification compliance or marked to indicate requested deviations from specification requirements. Check marks shall denote full compliance with a paragraph as a whole. If deviations from the specifications are indicated, and therefore requested by the CONTRACTOR, each deviation shall be underlined and denoted by a number in the margin to the right of the identified paragraph, referenced to a detailed written explanation of the reasons for requesting the deviation. The ENGINEER shall be the final authority for determining acceptability of requested deviations. The remaining portions of the paragraph not underlined will signify compliance on the part of the CONTRACTOR with the specifications. Failure to include a copy of the marked-up specification sections, along with justification(s) for any requested deviations to these specification requirements, with the submittal shall be sufficient cause for rejection of the entire submittal with no further consideration.


C. The CONTRACTOR shall submit a Performance Work Statement (PWS) which clearly defines the GFR-CIPP product delivery in conformance with the Contract Documents. Unless otherwise directed by the ENGINEER, the PWS shall include, but not limited to, the following information:

1. Clearly indicate the GFR-CIPP will conform to the project requirements as defined in the Contract Documents. Included in this shall be the CIPP system's shipping, storage, and handling requirements to insure that proper protocols will be in place to maintain the quality of the components.

2. Where the Work is specifically delineated in the Contract Documents, a detailed installation plan describing all preparation work, internal diameter host pipe verification, cleaning operations, pre-CCTV inspections, by-pass pumping or rerouting flows, traffic control, odor control, installation procedure, method of curing, quality control during installation, testing to be performed including frequency, final CCTV inspection, warrantees furnished and all else necessary and appropriate for a complete GFR-CIPP liner installation. A detailed installation schedule shall be prepared and submitted, and shall conform to the requirements of the Contract Documents.

3. A description of the GFR-CIPP materials to be furnished for the Project. Materials shall be fully detailed (i.e. MSDS information, resin system technical data sheet, tube technical data sheet showing glass used and in what position, composite testing done using these systems together, etc.) in the submittals and conform to these specifications and/or shall conform to the pre-approved product submission. Included in this description there should a listing of past test results from field installations performed using these materials. For the glass-fiber tube the quantity and location of the glass should be detailed for comparison.

4. The CONTRACTOR shall submit a testing plan detailing and describing all materials to be furnished to fully isolate and test installed CIPP liner and closure spools for review and acceptance by the ENGINEER. Pressure test records for post-installation tests on the closure spools shall be submitted to the ENGINEER within 24 hours of completion of the tests.

PART 2 - PRODUCTS

2.1 ENGINEERING OF THE GFR-CIPP LINER

A. The CONTRACTOR shall have a California Registered Professional Engineer produce a wall thickness design for each reach of pipe to be rehabilitated using the CIPP technology. The design shall be based on the proposed GFR-CIPP material's proven performance parameters. In any case, the minimum finished thicknesses for the nominal 30-inch and 36-inch liners using the minimum material properties shown in paragraph 2.2 D shall be 11.7 mm and 13.7 mm, respectively.

B. The design of the GFR-CIPP wall thickness shall be made with the assumption the existing ductile iron pipe will continue to degrade after lining has taken place and cannot be relied upon for the required 50-year design service life; thus the GFR-CIPP liner will have transferred to it the full responsibility for resisting the internal and external pressures acting upon the soil-structure interaction system. The Plans reflect the known horizontal and vertical alignment of the existing North and South Force Mains and can be used to determine the cover depths along the areas to be lined. The location of the water table (phreatic surface) from commercial geotechnical surveys was shown to be at –8.5 feet. The minimum design external hydrostatic pressure acting on the liner shall be 1.0 foot (above the crown of the liner).


C. The maximum average operating pressures for the 30-inch and 36-inch liners is designated to be 40 pounds per square inch (psi). The 50 year design pressure is 40 psi for both pipeline diameters. The instantaneous maximum pressure during a surge event is 90 psi for the 30-inch liner and 72 psi for the 36-inch liner. The test pressure to be applied during the acceptance process shall be 80 psi. The short term pressure is 80 psi for both pipeline diameters.

2.2 MATERIALS

A. The GFR-CIPP system shall be designed and capable of being hydrostatically tested at 80 psi.

B. The GFR-CIPP system shall have a minimum 50-year designed service life, only products deemed to have documented proof from the manufacturer of this performance or engineering testing to support an estimated 50-year performance will be accepted.

C. The GFR-CIPP systems that shall be considered are those manufactured by Insituform Technologies, InsituMain; RS Technick; Sekisui NordiTube, or equal.

D. The cured liner shall meet the following minimum strength requirements:

MINIMUM PHYSICAL PROPERTIES of the GFR-CIPP

Easter Property System ASTM

Test Method Epoxy System

Vinyl Ester System

Flexural Strength D790 4,500 psi 5,000 psi

Flexural Modulus (initial) D790 350,000

psi 350,000 psi

Flexural Modulus (50-year) D2990 175,000

psi 175,000 psi

Tensile Strength (initial) D638 12,000

9,000 psi 12,000 9,000 psi

Tensile Strength (50-year) D2990 4,000 psi 4,000 psi

E. GFR-CIPP Tube:

1. The tube shall consist of one or more layers of a flexible needled felt or an equivalent nonwoven or woven material, or a combination of nonwoven and woven materials, capable of carrying resin, withstanding installation pressures and curing temperatures. The tube should be compatible with the resin system used on the Project. The material should be able to fit irregular pipe sections and negotiate bends in the host pipe up to 45⁰. Projected changes in groundwater level, temperature and other loading factors shall cause no significant changes in the service characteristics or service life of the installed GFR-CIPP.

2. The liner shall be fabricated from materials which when cured, will be chemically resistant to reagents as defined in ASTM F1216, ASTM F1743, ASTM F2019 and ASTM D543.

3. The tube should be fabricated under controlled conditions to a size that, when installed, will tightly fit the internal circumference and the length of the original pipe rehabilitated. Allowances should be made for the longitudinal and circumferential stretching that occurs during placement of the tube. Maximum stretching allowances shall be as defined in ASTM F1216 or ASTM F1743 or ASTM F2019. The CONTRACTOR shall verify the lengths in the field before cutting the liner to length. Individual liner segments can be made up to 1,000 feet in length.


4. The tube shall be uniform in thickness and when subjected to the installation pressures and any polymerization shrinkage shall meet or exceed the designed wall thickness.

5. Any plastic film applied to the tube on what will become the interior wall of the finished GFR-CIPP shall be compatible with the resin system used, translucent enough that the resin is clearly visible, and shall be firmly bonded to the fibrous material. The finished material shall be suitable for exposure to raw sewage.

6. At time of manufacture, each lot of liner shall be inspected and certified to be free of defects. The tube shall be marked for distance at regular intervals along its entire length, not to exceed five feet. Such markings shall also include the Manufacturer’s name or identifying symbol.

7. The reinforcing material layers of the liner shall be a woven or stitched glass fiber mat formed into sheets of verifiable finished thickness using long fibers (or equivalent) such that the stated tensile strength capabilities of the liner can be achieved both in the circumferential and longitudinal loading directions. The fibers shall be "sized" for the resin system to be used such that long-term wicking at any exposed ends will not lead to weakened areas in the new pipe's wall.

8. Liners may be made of single or multiple layer construction where any layer must not be less than 1.5 mm thick. A suitable mechanical strengthener membrane or strip may be placed in between layers where required to control longitudinal stretching.

F. Resin System:

1. The resin system shall be a corrosion resistant epoxy or vinyl ester and catalyst system that when properly cured within the tube composite meets the minimum requirements given herein or those that have been utilized in the wall thickness design of the GFR-CIPP for the Project.

2. The resin shall have sufficient elongation capabilities to fully transfer the tensile loading to the glass fibers.

G. The CONTRACTOR shall submit the resin characteristics, including filler identification, to the ENGINEER for acceptance prior to lining activities.

H. End Seals: The beginning and end of the new pipe liner shall be sealed to the host pipe with a hydrophilic epoxy or other material or mechanical end seal. Hydrophilic end seals shall be compatible with the lining material and host pipe and shall provide a watertight seal capable of withstanding system test pressures. The end seal shall provide a watertight seal capable of withstanding system test pressures. End seal shall be in accordance with Green Book 500-1.1.7 and submitted with the CIPP shop drawings for review and acceptance. End seals shall be pressure rated to 80 psi and be Victaulic, Weko Seal, or equal.

PART 3 - EXECUTION

3.1 GENERAL

A. The CONTRACTOR shall deliver the liner to the site and provide all equipment required to insert and cure the liner within the host pipe. The CONTRACTOR shall designate a location where the tube will be vacuum impregnated prior to installation. The CONTRACTOR shall notify the ENGINEER at least 48 hours prior to wet out to allow the ENGINEER to observe the materials and wet out procedure. All procedures to prepare the liner for installation shall be in strict accordance with the Manufacturer’s recommendations.


B. The liner shall be impregnated with resin not more than 120 hours before the time of installation and stored out of direct sunlight at a temperature of less than 70° F.

3.2 NOTIFICATIONS AND PUBLIC OUTREACH

A. The CONTRACTOR shall inform and coordinate notification to all affected agencies, residents, businesses, schools, and the general public with OCSD’s Public Information Officer (PIO) in accordance with the General Requirements, section entitled “Advance Notification to Agencies”. In addition, the CONTRACTOR shall coordinate distribution of informational flyers for those affected by the Work at least 48 hours prior to any service disruption. The CONTRACTOR shall make every effort to maintain service usage throughout the duration of the Work.

3.3 PRE-LINING PREPARATION

A. The CONTRACTOR shall field verify the inside diameter of each reach of the existing ductile iron pipe prior to ordering materials. Means for the CONTRACTOR to field verify the inside diameter of each reach, shall be but not limited to saddle taps, core drilling, field verification via existing blind flanged manways and connections, cutting of abandoned pipe, or other methods acceptable to the ENGINEER. The methods and procedures for verifying the internal diameters of each reach shall be included in the CONTRACTOR’s Sequence of Work Plan. All field verification work shall be coordinated and accepted by the ENGINEER in concert with flow isolation activities to maintain system service as set forth in Section 01120 Work Sequence.

B. The CONTRACTOR shall perform cleaning and closed circuit television (CCTV) in accordance with Section 02761, Sewer Cleaning and Television Inspection.

C. Field verification of pipe lengths being lined shall be compared with lengths document during pre-lining CCTV inspection.

D. Verification of internal diameters of existing pipe to be lined shall be performed prior to ordering material.

E. It shall be the responsibility of the CONTRACTOR to notify the ENGINEER of line obstructions, offset joints or collapsed pipe that will prevent the insertion of the tube. The ENGINEER with input from the CONTRACTOR shall determine the method of pipe repair required and shall address these concerns on a case-by-case basis.

3.4 BYPASS PUMPING

A. The CONTRACTOR, if required in support of their means and methods, shall provide for the flow of sewage around the reach or reaches of pipe designated for lining, if required. The CONTRACTOR shall construct all necessary pumping equipment, conduit, etc. to adequately, safely, and environmentally divert sewage flow around the Work while maintaining access to local businesses, residents, driveways, sidewalks, etc.

B. The CONTRACTOR shall submit a bypass plan in accordance with the requirements in Section 02999, Temporary Handling of Sewage Flow, if required.

3.5 INSTALLATION

A. The GFR-CIPP shall be installed in accordance with the practices in ASTM F1216 for direct inversion installations. The quantity of resin used for the tube’s impregnation shall be sufficient to fill the volume of air voids in the tube. A vacuum impregnation process shall be used in conjunction with a roller system to achieve a uniform distribution of the resin throughout the tube. The resin saturation log shall document that the volume of resin used is between 98% and 102% of the tube manufacturer's stated full saturation.


B. A scaffold or elevated platform shall be erected at the access point. The resin-impregnated tube shall be installed into the host pipe by methods approved by the Manufacturer and proven through previous successful installations. The insertion method shall not cause abrasion or scuffing of the tube. Hydrostatic pressure shall be used to inflate the tube and mold it against the walls of the host pipe. There will be no use of sewage in place of clean water for insertion of the tube, or for the curing of the liner.

C. The tube is to be installed in a controlled manner at a rate sufficient to prevent damage to the tube and to push or “squeegee” any remaining water in the pipe ahead of the inserted liner. The installation rate for hydrostatic inversions shall be consistent with the available water flow rate to constantly maintain the required inflation pressure on the nose of the advancing tube throughout the inversion process.

3.6 CURING THE GFR-CIPP

A. After tube installation is completed the CONTRACTOR shall supply suitable hot water cure source and recirculation equipment. The equipment shall be capable of delivering hot water throughout the section to uniformly raise the temperature above the temperature required to effect a cure of the resin. This temperature shall be determined by the resin/catalyst system employed. Air inversion and steam cure process will not be allowed.

B. The heat source shall be fitted with suitable monitors to gauge the temperature of the incoming and outgoing heat supply. A temperature monitoring system placed in the invert of the host pipe and running the full length of the reach being cured shall be employed to confirm in real time that the required temperature for complete curing is achieved at all points in the liner.

C. Curing Monitoring System: Water temperature in the pipe during resin curing period shall be as required by the CIPP System Manufacturer's documented testing. Temperature monitor curing system shall be VeriCure, Zia System LLC, or equal.

D. Initial cure shall be deemed to be completed when inspection of the exposed portions of cured pipe appear to be hard and sound and the remote temperature monitoring system indicates that the temperature is of a magnitude to have realized an exotherm. The cure period after initial cure is observed shall be of a duration recommended by the GFR-CIPP System Manufacturer, as modified for the installation process, during which time the recirculation of the heat and cycling of the heat exchanger to maintain the temperature continues.

E. Water used for curing operations may be reused in consecutive pipe segments as part of the CONTRACTOR’s means and methods for lining and curing operations or hydrostatic testing or otherwise shall be disposed of in the same manner and meet the same requirements as groundwater dewatering effluent in Section 02140.

3.7 COOL DOWN

A. Cool down may be accomplished by the introduction of cool water into the installation standpipe to replace water being relieved from the downstream end. The CONTRACTOR shall cool the hardened liner to a temperature below 90° F before relieving the static head. A minimum period of post cure shall be maintained under a static head to provide a minimum hoop tension on the tube such that any heat related shrinkage is avoided. The temperature monitoring system called out above shall be used to monitor the entire cool-down process to confirm that the liner is below 90°F throughout its entire length. Care shall be taken in the release of the static head so that a vacuum will not be developed.


3.8 FINISH

A. The finished lining shall be continuous over the entire length of an insertion run between two access locations and be as free from visual defects such as foreign inclusions, dry spots, pinholes, and delamination in accordance with NASSCO standards. The lining shall be homogeneous, impervious, and free of any leakage from the surrounding ground to the inside of the lined pipe.

B. Wrinkles or fins on the interior wall surface are to be minimized with proper sizing and proper head control during the inversion process. Wrinkles or fins running with the flow in the pipe (longitudinally) may be accepted provided that they are no taller than 3% of the finished inside diameter (I.D.) of the liner. For wrinkles in excess of 3% height, the and the ENGINEER will determines whether a repair meeting the manufacturer’s repair procedures shall be employed and tested prior to acceptance. that that there would be no potential operation or maintenance issues from being left in place. Wrinkles or fins that run across the direction of the flow in the pipe must be ground down to within 0.25 inches of the wall surface or cut out, replaced and sealed. Wrinkle or fins that run across the direction of the flow in the pipe exceeding 3% of the finished I.D. of the liner, shall also be evaluated for repair and acceptance by the ENGINEER.

C. There shall be no wrinkling or folding of the glass fiber layers in the liner. If an area of the finished liner is deemed to exhibit this condition, it shall be thoroughly investigated; and, if found to truly be in this condition, the subject areas shall be removed and replaced.

D. During the warranty period, any defects which will affect the integrity or strength of the liner, collect solids, or reduce hydraulic flow capabilities of the product shall be repaired at the CONTRACTOR’s expense in a manner mutually accepted by the ENGINEER and the CONTRACTOR.

3.9 QUALITY ASSURANCE TESTING

A. For every segment of liner installed, two (2) restrained samples shall be processed and tested. The samples shall be cut from a section of cured GFR-CIPP at an intermediate manhole or at the termination point that shall be installed through a like diameter section of conduit or other tubular restraining means which shall be wrapped by a suitable heat sink such as sandbags. A flat plate test of properly oriented glass is allowable in order to demonstrate compliance with ASTM D638. Coupon testing for flexural strength in order to demonstrate compliance with ASTM D790 shall still be required.

B. Liner quality testing shall be completed by an accredited, independent laboratory. All labor, materials, and third party testing laboratory necessary for all testing shall be furnished by the CONTRACTOR, as part of the Work at no additional cost to OCSD. The CONTRACTOR shall submit laboratory with appropriate accreditation documentation for acceptance by the ENGINEER prior testing. Laboratories considered for acceptance include: Ramtech Laboratories, Paramount, CA phone (562) 633-4824; Hauser Laboratory, a Division of Microbac Laboratories, Boulder, CO phone (720) 406-4800; or equal.

C. The physical properties for each segment of the installed GFR-CIPP shall be verified through field sampling and laboratory testing. All materials testing shall be performed by an independent third party laboratory that: can demonstrate experience and approved by the GFR-CIPP manufacturer; and submitted by the CONTRACTOR with shop drawings to OCSD for review and acceptance.

D. At the start of the Work, the CONTRACTOR shall request expedited test results to be obtained within and provide results with 24 to 48 hours after laboratory receipt of the


samples, upon the laboratory receipt of samples. wherein a consistent time frame and procedure for temperature and humidity conditioning and testing for all samples, accepted by the ENGINEER, is employed. Lab results shall be provided to the ENGINEER within 24 hours, unless otherwise authorized. Frequency of test samples may be changed at the discretion of the ENGINEER.

E. Samples shall be conditioned and prepared in accordance with ASTM D618 and ASTM D5813 to ensure consistency in laboratory results.

F. Flexural testing shall be in accordance with ASTM D790, latest version, with only the structural portion of the GFR-CIPP being tested.

G. Tensile testing shall be in accordance with ASTM D638, latest version, with only the structural portion of the GFR-CIPP being tested.

H. The resin shall be tested by Infrared Spectroscopy (IR) which will provide a baseline resin IR spectrum to be compared to an IR spectrum of a resin sample taken onsite after the GFR-CIPP process has occurred to ensure that the resin installed is the same as the resin tendered. The frequency of this this test shall be determined by the ENGINEER based upon successful demonstration of compliance in the initial test..

I. Thickness shall be measured in accordance with ASTM D5813, latest version, with only the structural portion of the GFR-CIPP being measured. The installed liner thickness shall be measured for each GFR-CIPP section installed. If the GFR-CIPP thickness does not meet the accepted design tolerance defined below, the GFR-CIPP shall be repaired or removed. The GFR-CIPP thickness shall have tolerance of minus 5% and plus 10% of the accepted design thicknessfinished liner thickness shall be no less than 95% of the design thickness accepted by the ENGINEER. The CONTRACTOR shall remove a minimum of one sample from every GFR-CIPP section of installed GFR-CIPP to be used to check the GFR-CIPP thickness. The samples shall be taken by core drilling 2-inch diameter test plugs at accessible locations near manholes. The samples shall be collected by core drilling 2-inch diameter test plugs of the pipe material cured in an accurately sized restraint sleeve at the GFR-CIPP closure access pit. CONTRACTOR shall not core drill liner to remain in place in the final installation. As an alternative, the CONTRACTOR may submit for OCSD review and acceptance, industry proven non-destructive methods for confirming the thickness of the installed GFR-CIPP.

J. All GFR-CIPP sample testing and repairs to the installed GFR-CIPP, as applicable, shall be completed, before Final Acceptance, meeting the requirements of this section and documented in written form.

3.10 TESTING AND ACCEPTANCE

A. The CONTRACTOR shall be responsible for assuring testing is conducted in a safe manner and all applicable safety procedures are followed.

B. All post-lining CCTV inspections and pressure testing shall be performed in the presence of the ENGINEER and be subject to the ENGINEER’s acceptance.

C. The CONTRACTOR shall provide water, bulkheads, blind flange, assemblies, air compressors, air release vents pressure gauges, bladders and all other labor equipment, and materials to perform testing as described herein.

D. For GFR-CIPP continuous liner segments between closure spool assembly limits:

1. Test Method: Post liner installation visual inspection by closed circuit television (CCTV)


2. For safety reasons, air testing of GFR-CIPP continuous liner segments between closure spool assembly limits will NOT be allowed in liner lengths greater than 20 feet.

3. Liner test lengths shall be determined by the CONTRACTOR and accepted by the ENGINEER.

4. Hydrostatic testing of CIPP liner segments between HDPE closure assemblies is allowed, but not required, unless deemed necessary by the ENGINEER in order to accept repairs of defects performed by the CONTRACTOR.

5. The CONTRACTOR shall perform a detailed CCTV inspection in accordance with NASSCO standards, in the presence of the ENGINEER. A radial view (pan and tilt) TV camera shall be used. The camera shall be panned 360 degrees around the circumference of the pipe and along the wall of the finished GFR-CIPP at 10 foot intervals. The finished GFR-CIPP shall be continuous over the entire length of the segment and shall be free of significant visual defects, damage, deflection, holes, leaks and other defects. CCTV shall be performed in accordance with Section 02761, Sewer Cleaning and Television Inspection.

6. The data shall note the inspection date as well as any other defects in the GFR-CIPP, including, but not limited to, wrinkles, fins, gouges, cracks, bumps, or bulges. Immediately prior to conducting the CCTV inspection, the CONTRACTOR shall thoroughly clean the newly installed CIPP removing all debris and buildup that may have accumulated, if required by the ENGINEER.

7. CCTV inspection of the liner shall be performed with no sewage in the pipe. In the case of bellies or low points in the GFR-CIPP liner, the pipe shall be cleared of any standing water to provide continuous visibility during the inspection.

8. Any defect deemed unacceptable by the ENGINEER in Section 3.9 of this section, shall be repaired at the CONTRACTOR’s expense in accordance with manufacturer’s repair methods and accepted by the ENGINEER.

9. The CONTRACTOR shall provide all materials required to repair any defects deemed unacceptable in the finished liner. The repair shall be isolated and re-tested in accordance with the test procedures for joint connections and closure spools.

E. For CIPP to New HDPE closure spool assemblies (see Sheet C5014 of the Plans) or repaired defects-:

1. The CONTRACTOR may elect toshall perform either a hydrostatic test or low pressure air test at the CIPP to new HDPE closure spool assemblies including internal end seals.

2. Test Pressure: Hydrostatic test pressure shall be maximum 80 psi. Air test pressure shall be maximum 5 psi. Test method shall be selected by CONTRACTOR in accordance with Paragraph E.1 above.

3. The CONTRACTOR shall leave closure spool assemblies exposed for visual inspection by the ENGINEER.

4. The CONTRACTOR shall construct all necessary testing apparatus, bulkheads, materials, equipment, restraint systems, labor to safely perform pressure testing of the GFR-CIPP to new HDPE closure spool assemblies or repaired sections.

5. The CONTRACTOR shall provide water, air compressor, bulkheads, blind flange, assemblies, air compressors, pressure gauges, bladders and all other labor equipment, and materials to isolate and test the new GFR-CIPP joint connections, closure spool assemblies, or repaired sections.


6. The closure spool assembly shall be adequately restrained prior to pressure testing. Thrust blocks, where required, shall be installed prior to testing.

7. For hydrostatic testing, the test section shall have concrete encasement or CLSM backfill in place prior to test. The test section shall be filled with water and all air shall be allowed to vent from the test section and then the pressure in the isolated test section shall be filled with clean water and raised at a steady rate to 80 psi. An independent air release mechanism shall be included as part of the testing apparatus. The initial pressure shall be applied and allowed to stand without makeup pressure for up to 1 hour to equilibrate. After the test pressure equilibrates, the test section shall be returned to the required test pressure and held for 1 hour.

8. For air pressure testing, test may be performed without concrete encasement or CLSM backfill in place. A pressure of 5 psi shall be applied to the isolated test section through a test valve. The test segment must be able to maintain a gauge pressure of 5 psi for 5 minutes without additional air added.

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