7013 - Lake Lewisville Water Treatment Plant Phase II Improvements, Addendum 2- Modification to the Specs (2)HDPE Piping 33 31 13.16 - 1
DTN18104 – Lake Lewisville Water Treatment Plant Phase II Improvements
33 31 13.16 HDPE PIPING
1.00 GENERAL
1.01 WORK INCLUDED
A. Furnish labor, materials, equipment and incidentals necessary to install polyethylene pipe,
and complete installation in accordance with the Contract Documents. The finished pipe
shall be continuous over the entire length and be free from defects.
1.02 QUALITY ASSURANCE
A. Polyethylene pipe jointing shall be performed by personnel trained in the use of the thermal
butt-fusion equipment and recommended methods for new pipe connections. Personnel
directly involved with installing the new pipe shall have received training in the proper
methods for handling and installing the polyethylene pipe. Training shall be performed by a
qualified representative of the pipe manufacturer. The Contractor shall maintain records of
trained personnel, and shall certify that training was received not more than 12 months
before commencing construction.
1.03 SUBMITTALS
A. Submittals shall be in accordance with Section 01 33 00 “Submittals” and shall include:
1. Shop Drawings, catalog data, and manufacturer’s technical data showing complete
information on material composition, color, physical properties, and dimensions of new
pipe and fittings. Include manufacturer’s recommendation for handling, storage, and
repair of pipe and fittings.
1.04 STANDARDS
A. Comply with local governing regulations if more stringent than specified herein. Piping shall
meet the following standards and shall be a part of this Section as if written here in their
entirety.
1. American Society for Testing and Materials (ASTM) Standards:
ASTM F1473 Test Method for Notch Tensile Test to Measure the Resistance to
Slow Crack Growth of Polyethylene Pipes and Resins
ASTM D2122 Determining Dimensions of Thermoplastic Pipe and Fittings
ASTM F2620 Standard Practice for Heat Fusion Joining of Polyethylene Pipe and
Fittings
ASTM D2837 Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials
ASTM D3035 Specification for Polyethylene (PE) Plastic Pipe (SDR-PR) Based on
Controlled Outside Diameter (up to 3-Inch IPS)
ASTM D3350 Specification for Polyethylene Plastics Pipe and Fittings Material
ASTM F714 Specification for Polyethylene (PE) Plastic Pipe (SDR-PR) Based on
Outside Diameter (4-Inch IPS and larger)
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DTN18104 – Lake Lewisville Water Treatment Plant Phase II Improvements
2. American Water Works Association (AWWA) Standards:
AWWA C906 Polyethylene (PE) Pressure Pipe and Fittings, 4 through 64 Inches, for
Water Distribution
AWWA M55 Polyethylene (PE) Pipe Design and Installation
B. Domestic water piping shall be approved by the Underwriters Laboratory and shall be
accepted by the State Fire Insurance Commission for use in water distribution systems.
HDPE water pipe shall bear the seal of approval (or “NSF” mark) of the National Sanitation
Foundation Testing Laboratory for potable water pipe.
1.05 DELIVERY, STORAGE, AND HANDLING OF MATERIALS
A. Transport, handle, and store pipe and fittings as recommended by manufacturer.
B. If new pipe and fittings become damaged before or during installation, it shall be repaired as
recommended by the manufacturer or replaced as required by the Owner’s Project
Representative at the Contractor’s expense, before proceeding further.
C. Deliver, store, and handle other materials as required to prevent damage.
2.00 PRODUCTS
2.01 MATERIALS
A. Pipe: Polyethylene Plastic Pipe shall be high density polyethylene pipe (HDPE).
1. Solid wall high density polyethylene for pressure water pipe shall meet the
requirements of AWWA C906 “Polyethylene (PE) Pressure Pipe and Fittings, 4 through
64 Inches, for Water Distribution” (Ductile Iron Pipe Sizing).
B. All pipe shall be made of virgin material. No rework except that obtained from the
manufacturer’s own production of the same formulation shall be used.
1. The pipe shall be homogenous throughout and shall be free of visible cracks, holes,
foreign material, blisters, or other deleterious faults.
2. Dimension Ratios: The minimum wall thickness of the polyethylene pipe shall meet the
following:
a. Pressure Applications: AWWA C906 DR-11 Pressure Class 160.
3. All HDPE shall be carbon black or solid gray stabilized throughout the structural wall for
ultra-violet protection. The pipe shall have a near white inside diameter to facilitate
future TV inspection.
C. Polyethylene Fittings: The polyethylene fittings shall be manufactured from a polyethylene
compound which conforms to ASTM D3350 cell class PE445574C or E material. Fittings shall
be manufactured by the same manufacturer as the pipe.
1. Pipe fittings shall have a long-term hydrostatic strength rating of 1600 psi or more at 23
degrees Celsius, in accordance with ASTM D2837.
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2. Environmental stress crack resistance (ESCR) of the material shall meet the
requirements as specified in ASTM D3350 Cell Classification of 7 for a 500-hour PENT
material using ASTM F1473 (PENT).
D. Select Material: Selected or processed excavated trench material shall be Class 10
Aggregate Fill in accordance with Section 31 23 33.19 “Trenching and Backfill.”
2.02 MATERIALS TEST
A. Tests for compliance with this Section shall be made as specified herein and in accordance
with the applicable ASTM Specification. A certificate of compliance with ISO 9000 shall be
furnished, by the manufacturer for all material furnished under this Section. Polyethylene
plastic pipe and fittings may be rejected for failure to meet any of the requirements of this
Section.
3.00 EXECUTION
3.01 HANDLING
A. The joints shall be handled near the middle with wide web slings and spreader bars. Rope
slings also work well with straight lengths. The use of chains, end hooks or cable slings that
may scar the pipe are not permitted. The following procedures shall be observed when
handling HDPE pipe.
1. Always stack the heaviest series of pipe at the bottom.
2. Protect the pipe from sharp edges when overhanging the bed of a truck or trailer by
placing a smooth, rounded protecting strip on the edge of the bed.
3. The load should be anchored securely to prevent slippage.
B. Lengths of small-diameter, lightweight pipe can be unloaded manually.
C. Pipe applications shall normally be handled by:
1. Unloading the pipe from the truck in a row along the side of the installation area and
moving the fusion unit along the row of joints.
2. Stacking the pipe beside the fusion unit and trailing the pipe out after fusion, then
dragging the long length of pipe into place for installation. It is suggested that as the
pipe is fused and moved through the fusion machine, additional joints of pipe should be
placed in the moveable jaw side of the machine for each subsequent fusion. This
prevents the hydraulic system of the machine from having to pull the previously fused
long length.
D. Dragging the pipe into place is permitted provided the pipe isn’t damaged from sharp rocks
or excessive abrasion created by pulling the pipe great distances.
3.02 STORAGE
A. If the pipe must be stacked for storage, avoid excessive stacking heights. Out-of-roundness
can be created in the lower rows of pipe, due to excessive stacking heights. The limitation
on storage height is 8 rows for pipe 6 inches or less, 3 rows for pipe 8 inches or less, 2 rows
for pipe 32 inches or less and 1 row for pipe 63 inches or less.
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B. Care shall be taken to ensure that the pipe is stacked in straight rows. The expansion and
contraction caused by uneven heating by the sunlight shall be prevented by restraining the
racks.
C. Pipe laid directly on the ground shall be placed on an area free of loose stones or sharp
objects. Scarring or gouging of the pipe shall be avoided.
3.03 PIPE JOINING
A. The polyethylene pipe shall be assembled and joined at the Site using the thermal butt-
fusion method to provide a leak proof joint. Threaded or solvent-cement joints and
connections are not permitted. All equipment and procedures used shall be in strict
compliance with the manufacturer’s recommendations. Fusing shall be accomplished by
personnel certified as fusion technicians by a manufacturer of polyethylene pipe and/or
fusing equipment.
B. The butt-fused joint shall be in true alignment and shall have uniform roll-back beads
resulting from the use of proper temperature and pressure. The joint shall be allowed
adequate cooling time before removal of pressure. When cool, all weld beads shall then be
removed from both the inside and outside surface such that the joint surfaces shall be
smooth. The fused joint shall be watertight and shall have a tensile strength equal to that of
the pipe. All joints shall be subject to acceptance by the Owner’s Project Representative. All
defective joints shall be cut out and replaced at no cost to the Owner. Any section of the
pipe with a gash, blister, abrasion, nick, scar or other deleterious fault greater in depth than
10 percent of the wall thickness, shall not be used and must be removed from the Site.
However, a defective area of the pipe may be cut out and the joint fused in accordance with
the procedures stated above. In addition, any section of pipe having other defects such as
concentrated ridges, discoloration, excessive spot roughness, pitting, variable wall thickness
or any other defect of manufacturing or handling as determined by the Owner’s Project
Representative shall be discarded and not used.
3.04 BENDING PIPE
A. HDPE may be cold-bent to a minimum radius of 40 times the pipe diameter as it is installed,
eliminating the need in many cases for elbows for slight bends. The minimum bending
radius that can be applied to the pipe without kinking varies with the diameter and wall
thickness of the pipe. Contractor shall conform to manufacturer’s recommendations. If
adequate space is not available for the required radius, a fitting of the desired angle shall be
fused into the piping system to obtain the necessary change in direction.
3.05 INSTALLATION BELOW GROUND
A. Pipe Laying:
1. When pulling pipe, either a pulling head or a suitable wraparound sleeve with rubber
protective cover shall be used to prevent the pulling cables from damaging the pipe.
The pipe shall not be pulled by the flanged end.
2. Open cut installations shall be in accordance with Section 31 23 33.19 “Trenching and
Backfill.”
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B. Grouting (Continuous or at Manholes): Pipe running through a manhole wall shall be
anchored by attaching a collar or side fused branch saddles to the pipe and encasing them in
the wall of the manhole.
3.06 FIELD QUALITY CONTROL
A. Testing shall be as specified in Section 01 45 23 “Testing and Inspection Services.”
B. Hydrostatic Testing for pressure piping systems shall be performed in accordance with ASTM
F2164. Testing pressure shall not exceed 1.5 times the system design pressure and total
testing time including the time required to pressurize, stabilize, hold test pressure, and
depressurize should not exceed 8 hours. If 5 psi is lost during testing pipeline must be re-
pressurized.
C. HDPE pipe deflection shall not exceed deflection percentages identified in ASTM F1962 or
manufacturer’s maximum allowable deflection, whichever is lower. Allowable pipe
deflection varies based on DR rating. The following maximum deflection percentages can be
used for the following DR ratings: DR21 – 7.5 percent, DR17 – 6.0 percent, DR15.5 – 6.0
percent, DR13.5 – 6.0 percent, DR11 – 5.0 percent, DR9 – 4.0 percent, DR7.3 – 3.0 percent.
Deflection measurements can be taken by mandrel or by measurement of inside diameter
before and after backfill operations.
D. Do not enclose or cover any Work until inspected.
3.07 CLEAN AND ADJUST
A. Remove surplus pipeline materials, tools, rubbish and temporary structures and leave the
construction site clean, to the satisfaction of the Owner’s Project Representative.
END OF SECTION