Search

SECTION 02650

CURED-IN-PLACE PIPE (CIPP) LINING OF EXISTING SEWERS
(HOT WATER & STEAM)

PART 1 GENERAL

1.01 DESCRIPTION

A.

SCOPE

The work consists of furnishing all labor, equipment, materials, and incidentals
required to rehabilitate existing sewer mains by the installation of cured-in-place
pipe (CIPP) into the existing main. Work will include bypass pumping, sewer
cleaning and root cutting including decanting and disposal of debris at the City
landfill, initial closed circuit television (CCTV) inspection, identification of
existing live taps, removing of protruding taps by remote methods, installation of
resin-impregnated tube into the existing pipe followed by hot water or steam
curing as specified by the resin manufacturer, reopening service taps into the line,
sampling and testing, final closed circuit television (CCTV) inspection, and all
other related work. Before final acceptance of each line segment, a post-
rehabilitation video inspection and sample testing must be conducted and
approved. Rehabilitation must be completed for the full length from the manhole
to manhole, resulting in a sound, tight-fitting water-tight liner with a smooth
interior surface. All such work shall comply with these specifications and the
specific product manufacturer’s recommendations. Any conflict between the
product manufacturer’s recommendations and any portion of the contract
documents shall be resolved with the Engineer prior to proceeding with the work.

The Contractor, or the sub-contractor(s), shall not change any material, design
values or procedural matters stated or approved herein, without informing the
Engineer and receiving written advance approval of the change

Note:

Reference is made to the Supplementary Conditions Section A. Prosecution of
Work for a description of the process by which the Engineer will direct the
Contractor to make spot repairs both before and after lining.

SAFETY

This standard does not address safety problems associated with the use of this
product. It is the responsibility of the Contractor to establish appropriate safety
and health practices and determine the applicability of regulatory limitations prior
to use.

1.02 RELATED WORK:

A. Section 01110, CONTROL OF WORK AND MATERIALS

2019 CIPP Lining Project CIPP Lining of Existing Sewers (Hot Water or Steam)

Nashua, NH

02650-1

B. Section 02085, POLY VINYL CHLORIDE PIPE AND FITTINGS

C. Section 02252, SUPPORT OF EXCAVATION

D. Section 02300, EARTHWORK

E. Section 02441, CLEANING, ROOT CUTTING, AND TELEVISION (CCTV)

INSPECTION OF PIPELINES
F. Section 02631, PRECAST MANHOLES
G. Section 02745, ROAD RESTORATION

H. Section 02800, MANHOLE REHABILITATION

1.03 REFERENCE STANDARDS

A. ASTM STANDARDS
The following references are part of this Specification. The latest edition of the
following references shall be used:

ASTM D 543: Standard Test Methods for Resistance of Plastics to
Chemical Reagents.

ASTM D 638: Standards Test Methods for Tensile Properties of
Plastics.

ASTM D 790: Standard Test Methods for Flexural Properties of

Unreinforced and Reinforced Plastics and Electrical
Insulating Materials.

ASTM D2990: Standard Test Methods for Tensile, Compressive,
and Flexural Creep and Creep-Rupture of Plastics.

ASTM F 1216: Standard Practice for Rehabilitation of Existing
Pipelines and Conduits by the Inversion and Curing
of a Resin-Impregnated Tube.

ASTM F 1743: Rehabilitation of Existing Pipelines and Conduits
by Pulled-in-Place Installation of Cured-in-Place
Thermosetting Resin Pipe (CIPP)

2019 CIPP Lining Project CIPP Lining of Existing Sewers (Hot Water or Steam)
Nashua, NH 02650-2

* (Note: The Contractor may substitute an alternative method other than by
inversion to install the liner, as approved by the Engineer.

1.04 QUALITY ASSURANCE

A.

REQUIREMENTS

1.

Products used in the work of this section shall be produced by manufacturers
regularly engaged in the manufacture of cured-in-place liners for municipal
wastewater systems and with a history of successful production acceptable to
the owner.

The installing Contractor shall be licensed by the cured-in-place lining system
manufacturer and shall have successful experience in the installation of cured-
in-place lining systems in municipal wastewater systems. The Contractor
shall also be familiar with the specified requirements and the methods needed
for proper performance of the work of this section.

. When requested by the owner, the Contractor shall submit evidence

acceptable to the Engineer, such as a certified copy of a license or agreement,
that it has the authority to use and/or install the liner product.

The finished liner shall be continuous over the entire length of the liner
insertion run between the manholes and shall be free from visual defects such
as foreign inclusions, dry spots, pinholes, and delamination.

Wrinkles in the finished liner pipe which cause a backwater of one inch or
more or reduce the hydraulic capacity of the pipe are unacceptable and shall
be removed or repaired by the Contractor. If a void between the wrinkle and
the pipe develops, the Contractor shall repair or replace that section of the
pipe. Methods of repair shall be proposed by the Contractor and submitted to
the owner for review.

Following sewer cleaning and prior to installation of liner and finish work at
the manholes, the sewer shall be televised and recorded on videotape or in
digital format acceptable to the Engineer such as CD or DVD, and shall be
provided to the Engineer. The Contractor shall also televise the sewer after
completion of all liner insertion and finish work at the manholes. All Closed-
Circuit Television (CCTV) work is to be completed per industry standard of
care for sewer inspections and as specified herein.

The Contractor installing the Sectional Lining system shall have completed at
least five (5) projects, in the United States, within the past three (3) years and
projects that included CIPP installation lengths of at least 300 continuous
linear feet, on-site wet-out or resin impregnation of the liner tube, and design

2019 CIPP Lining Project CIPP Lining of Existing Sewers (Hot Water or Steam)

Nashua, NH

02650-3

of a similarly sized Sectional Liner wall thickness based on a fully
deteriorated condition.

8. Supervisory personnel shall have a minimum of five (5) years of experience in
a supervisory role, and shall have completed at least five (5) projects of
similar size and complexity as this project within the past five (5) years.
Attach résumés of each person named. Résumé information shall include, at a
minimum, educational background, the number of years in a supervisory
capacity and a list of completed projects within the past two (2) years,
including project description, complexity and contract total amounts.

1.05 SUBMITTALS
The Contractor shall submit the following information:

A. MATERIAL SUBMITTALS

Contractor shall provide submittals on all lining materials and resins, and shall
furnish the manufacturers’ certifications that all of the liner materials are in
compliance with the specifications, codes, and standards referenced herein.
Calculations for the liner design and wall thickness for each manhole to manhole
section of pipe shall be prepared in accordance with ASTM 1216, signed and
sealed by a Professional Engineer registered in New Hampshire. The submittals
shall include installation instructions and details of all component materials and
construction methods. The Contractor shall also provide the liner tube
manufacturer’s certifications, field measurements, and pipe sizing calculations
which demonstrate that the liner tube has been properly sized to avoid the creation
of wrinkles or folds. The Contractor shall furnish Material Safety Data Sheets for
all appropriate materials to be used in the project.

B. INSTALLATION SUBMITTAL
The Contractor shall submit the method of liner insertion, liner size, thickness
calculations, and assumptions used as the basis for calculations for review by the
Engineer prior to the start of work. The liner shall provide complete structural
support without considering any structural support from the existing pipe except
during construction.

1.06 DESIGN PARAMETERS

A. The newly installed liner shall be designed for a minimum fifty-year service life
under continuous loading conditions. The design shall assume no bonding to the
original pipe wall. The liner shall be designed to withstand all imposed loads.

2019 CIPP Lining Project CIPP Lining of Existing Sewers (Hot Water or Steam)
Nashua, NH 02650-4

Parameter C.LP.P. System

1. Pipe Condition Fully deteriorated

2. Soil Type Per in-situ conditions

3. Design Thickness Fiberglass: ASTM 1216 Design Formula,

4. Ovality of Pipe: 2% of circumference.

5. Soil Land 120 Ibs/ft.’

6. Traffic Loads Per AASHTO-HS-20-44 Highway Loading

7. Modulus of Soil 500 psi.

8. Maximum Deflection 5%

9. Minimum Safety 2.0

10. Resin Migration Not Allowed

11. Soil Cover Maximum depth of cover over the pipe
crown to highest ground surface along the
length of the pipe lining.

12. Water Table Assume at ground surface.

PHYSICAL PROPERTIES: The cured pipe shall conform to the minimum
structural standards, as follows:

Tensile Stress ASTM D-638 3,000psi
Flexural Stress ASTM D-790 4,500psi
Modulus of Elasticity ASTM D-790 250,000psi
(Initial)

Modulus of Elasticity ASTM D-2990 125,000psi
(Long Term)

Porosity/Water Tightness Test Tight

1.07 LINER THICKNESS CALCULATIONS

A. Calculations for the felt liner design and thickness for each manhole to manhole
section of pipe shall be prepared, signed and sealed by a Professional Engineer
registered in New Hampshire, and submitted to the Engineer for review prior to
lining. The minimum allowable thickness for CIPP products is 4.5mm and must
be increased as necessary to meet ASTM 1216 Design Formula in 1.5mm
manufacturing increments. Lining products below the stated minimum wall
thickness (above) will not be allowed under any circumstances.

1.08 CHEMICAL RESISTANCE

A. CHEMICAL RESISTANCE
Chemical resistance shall be in accordance with the requirements of Section 8 of
ASTM F 1216, Section X2, Chemical Resistance Tests for polyester resins and
completed in accordance with Test Method D 543. Exposure should be for a

2019 CIPP Lining Project CIPP Lining of Existing Sewers (Hot Water or Steam)
Nashua, NH 02650-5

minimum of one month at 73.4 degrees F when subjected to the following

solutions:
Chemical Solution Concentration, %
Tap Water (ph 6-9) 100
Nitric Acid 5
Phosphorus Acid 10
Sulphuric Acid 10
Gasoline 100
Vegetable Oil 100
Detergent 0.1
Soap 0.1

The Contractor shall be responsible for all costs associated with the chemical
resistance tests. Proof of meeting these requirements shall be provided to the
Engineer for approval at least 7 days prior to the commencement of work.

1.09 WARRANTY

A. WARRANTY
The Contractor shall provide the Owner with a warranty to be in force and effect
for a period of one (1) year from the date of final acceptance of the project by the
Owner. The warranty shall cause the Contractor to repair or replace the liner
should failure or damage result from faulty materials or installation. At the end of
the warranty period, the Owner may perform a television inspection to confirm
the condition of the liner.

PART 2 MATERIALS
2.01 GENERAL

A. CERTIFICATE OF COMPLIANCE
A Certificate of Compliance with these Specifications shall be provided by the
manufacturer for all materials furnished under these specifications.

2.02 MATERIALS

A. RESIN

1. Unless otherwise specified, the Contractor shall furnish a general purpose,
unsaturated, thermosetting, polyester resin, able to cure in the presence or
absence of water, and a catalyst system compatible with the liner material that
provides the cured physical and chemical resistance strengths specified. The
initiation temperature for cure shall be as recommended by the resin

2019 CIPP Lining Project CIPP Lining of Existing Sewers (Hot Water or Steam)
Nashua, NH 02650-6

B.

manufacturer and approved by the Engineer. Upon request, the Contractor
shall furnish satisfactory written certification that the materials comply with
the manufacturer’s standards and the reference specifications.

General corrosion requirements: The liner shall be fabricated from materials
which, when cured, will be chemically resistant to withstand exposure to
normal sewage effluent.

Resin shall not be affected by ultraviolet light and shall form no excessive
bubbling or wrinkling during lining. Resins shall be tinted for visibility and
provide indication of adequate liner wet-out. Material safety data sheets
(MSDS) for the resin, catalyst, cleaners and repair agents should be submitted
to the Engineer for review.

LINER TUBE

1.

The liner tube shall consist of one or more layers of flexible needled felt or an
equivalent non-woven and/or woven material capable of carrying resin,
withstanding installation pressures and curing temperatures, and compatible
with the resin system used. The liner tube shall be fabricated to a size that
will fit the internal circumference of the existing sewer main. Allowance shall
be made for stretching due to insertion of liner and deterioration of existing
pipe walls.

The minimum liner tube length shall be that deemed necessary by the
Contractor to effectively and continuously span the distance from the inlet to
the outlet of the respective manholes, unless otherwise specified. The
Contractor shall verify the lengths in the field before impregnation and
installation of the tube. Individual insertion mms may be made over one or
more manhole sections as determined in the field by the Contractor and
approved by the Engineer.

Prior to insertion, the liner tube shall be free of all visible tears, holes, cuts,
foreign materials, and other defects.

PART 3 INSTALLATION

3.01 GENERAL

3.02 PRE-INSTALLATION

A.

Prior to installation of the liner, the following activities are required:

a. Receipt and approval of pre-installation submittals.
b. Verification of line condition and any obstructions by video inspection.

2019 CIPP Lining Project CIPP Lining of Existing Sewers (Hot Water or Steam)

Nashua, NH

02650-7

B.

c. Verification of existing taps in service by flowing water, dye test, or visually
with a pan and tilt head camera or other means.

d. Cleaning of line (recorded on video tape).

Root cutting

f. Construct and complete any and all point repairs deemed necessary shall
receive Engineer’s approval before reworking the lines and the liner is
installed.

@

Prior to installation, the diversion pumping system, including back-up pumps,
shall be tested and running.

3.03 PREPARATION

A.

CLEANING, ROOT CUTTING AND INSPECTION

Debris shall be removed from the pipeline with high velocity jet cleaners. All
roots shall be cut and removed with appropriate equipment. The pipeline shall be
inspected with CCTV equipment to assure that the pipe is in a condition that it
can be lined. Obstructions shall be removed and services marked for
reinstatement prior to lining.

BYPASS PUMPING

Bypass pumping shall usually be made by plugging the upstream manhole and
pumping the sewage into the downstream manhole, or by pumping into an
alternate sewer system of adequate capacity to handle the additional sewage flow.
The pump and bypass lines shall be sized to handle the anticipated flows.

LATERAL CONNECTIONS
Contractor shall record location, size, material and relative invert elevation of
each lateral connection with respect to the pipeline.

3.04 INSTALLATION PROCEDURES

A.

INSTALLATION

Installation of the liner shall be through existing or new manholes. Excavation for
liner insertion shall not be permitted except to remove and replace the manhole
cones, if necessary and/or required.

WATER

Where water is used for insertion and curing processes it may be supplied from
existing fire hydrants. The Contractor shall make arrangements for obtaining
water. Costs for water shall be borne by the Contractor.

RESIN IMPREGNATION

The Contractor shall designate a location where the liner tube will be impregnated
with resin prior to installation. The liner tube shall be impregnated by vacuum or
other approved means. The Contractor shall allow the Owner and Engineer to

2019 CIPP Lining Project CIPP Lining of Existing Sewers (Hot Water or Steam)

Nashua, NH

02650-8

inspect the materials and “wet out” procedure. A resin and catalyst system
compatible with the requirement of this method shall be used.

Materials shall be transported to, and stored at, the site in such a manner that they
will not be damaged, exposed to direct sunlight, or result in any public safety
hazard. All materials shall be subject to inspection and review by the Engineer
prior to installation.

D. LINER INSERTION
The impregnated tube shall be inserted through existing or new manholes and the
application of a hydrostatic head, compressed air, or other means sufficient to
fully extend it to the next designated manhole. The liner shall be installed at a rate
greater than 3 feet per minute and less than 10 feet per minute.

The Contractor shall ensure that the pressure in the liner exceeds both the pressure
due to the groundwater head and any pressure due to sewage in laterals or
connecting side sewers

A pre-liner may be required prior to liner installation in sewers with infiltration or
missing pipe sections.

E. CURING
After insertion of the tube is complete, the Contractor shall provide a suitable heat
source and distribution system to circulate hot water, air, and/or steam through the
pipe as recommended by the manufacturer. The equipment shall be capable of
delivering hot water, air, and/or steam to uniformly raise the temperature above
that required to cure the resin. This temperature shall be determined by the
manufacturer based on the resin/catalyst system employed.

The heat source piping shall be fitted with suitable continuous monitoring
thermocouples to gauge the temperature of the incoming and outgoing curing
medium. The temperature of the curing medium shall meet the requirements of
the resin manufacture as measured at the heat source inflow and outflow return
lines. Additional continuous monitoring thermocouples shall be placed between
the impregnated felt tube and the pipe invert at the manholes. The curing medium
temperature in the line during the cure period shall be as recommended by the
resin manufacturer. Care shall be taken during the elevated curing temperature so
as not to over stress the liner materials.

Initial cure shall be deemed to be completed when inspections of the exposed
portions of liner appear to be hard and sound and the remote temperature sensor
indicates that the temperature is of a magnitude to realize an exotherm. The cure
temperature shall be held for the period recommended by the resin manufacture,
during which time the distribution and control of the curing medium shall
continue. Curing the CIPP shall consider the host pipe material, resin/catalyst
system, ambient temperature, moisture level, and thermal conductivity of the soil.

2019 CIPP Lining Project CIPP Lining of Existing Sewers (Hot Water or Steam)
Nashua, NH 02650-9

COOL-DOWN

The Contractor shall cool the hardened liner to a temperature below 100 degrees F
before relieving the pressure in the section. Cool-down may be accomplished by
the introduction of cool water or air into the lined pipe to replace water or steam
and water being drained. Water shall be drained from a small hole made in the
downstream end. Care shall be taken in the release of the static head or air
pressure so that a vacuum will not be developed that could damage the pipe or the
newly installed lining. After the tube is cured, a cool down period shall be used
prior to opening the downstream plug and returning normal flow back into the
system.

SEALING AT MANHOLES
A tight seal of the liner at the manhole walls consisting of a resin mixture
compatible with the liner/resin system may be applied in accordance with
manufacturer specifications.

FINISH

The finished CIPP shall be continuous over the entire length of any section
and be as free as commercially practicable from visual defects such as
foreign inclusions, dry spots, pinholes and delamination.

3.05 REINSTATEMENT OF SERVICES

A.

SERVICE CUTS

All live services shall be reinstated as soon as practical after rehabilitation,
testing, and cooling of sewer lines. Inactive services may be left unopened as
directed by the Engineer. It is the Contractor’s responsibility to document all live
services prior to lining. Each service connection shall be noted by its size,
position from a reference manhole, and orientation with respect to the
circumference of the pipe. Reconnection shall be accomplished from the interior
of the sewer line by means of a television camera and a remote controlled cutting
device. Excavation to activate existing sewer services shall not be allowed.

CUTTING AND BRUSHING

Holes cut through the rehabilitation liner shall be done in a two-step process. The
holes shall be first cut open with a router bit or deburring tool, and then brushed
with a wire brush to a neat and smooth surface. Holes shall reopen service lines to
a minimum of ninety (90%) percent of the service lateral. A one-step process that
accomplishes the same effect may be used if approved by the Engineer.

2019 CIPP Lining Project CIPP Lining of Existing Sewers (Hot Water or Steam)

Nashua, NH

02650-10