140P2022R0045-0005_Att01a-Q35_SpecSect334120-HighDensityPolyethylenePipe_220819_0005.pdf

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1/28/2022 HIGH DENSITY POLYETHYLENE PIPE

SECTION 33 41 20 - HIGH DENSITY POLYETHYLENE PIPE

PART 1- GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SCOPE

A. This Section governs the material, pipe, fittings, joining methods and general construction practice for High Density Polyethylene (HDPE) piping systems.

1.3 EXPERIENCE OF THE CONTRACTOR IN PERFORMING WORK

A. The work described herein shall be performed by a company with not less than three (3) years of experience in providing installation of HDPE Pipe and Fittings, employing experienced workers and experienced supervisory personnel. Supervisory personnel shall have not less than three (3) years of experience in providing the required services and shall be present at the jobsite during all work related to the required services.

B. The Contractor and the Contractor’s job foreman shall have three (3) years of experience in the installation of HDPE Pipe and Fittings. Both shall have installed a minimum of 10,000 lineal feet of HDPE butt fused pipe and have experience in electrofusion. Both shall have completed a manufacturer’s HDPE training program on the McElroy fusion equipment and Central or Friatec electrofusion equipment.

1.4 REFERENCES

A. The following standards form a part of this specification as referenced herein.

1. American National Standards Institute (ANSI);

2. American Society for Testing and Materials (ASTM);

3. Federal Specifications (FS);

4. International Standards Organization (ISO); and

5. Manufacturer’s printed recommendations.

1.5 QUALITY CONTROL TESTING

A. Prior to HDPE pipe being installed in the trench, after the Contractor has begun butt fusion of the pipe, the Contracting Officer reserves the right to select at random two butt fusion joints (with a minimum of 18 inches of pipe on each side of the joint). These samples shall be sent to the HDPE supplier for hydrostatic testing at the Contractor’s expense.

B. The testing procedure shall be to Factory Mutual Standards. In no case will the failure be in the butt fusion joint. The test will be recorded and sent to the Contractor and Contracting Officer.

Upon failure of any butt fusion weld; Contractor shall be required to cut and re-weld all questionable butt fusion joints as directed by the Contracting Officer.

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1.6 SUBMITTALS

A. Submittals shall be provided in accordance with the requirements as specified in Division 01.

B. Prior to beginning the work, submit six (6) sets of the following:

1. Qualifications of the firm/personnel who will perform the work.

2. Provide at least five (5) references of different projects in which at least 500 linear feet of

HDPE piping have been installed by the firm within the past three (3) years.

C. Shop Drawings and/or brochures shall be submitted for all items furnished in accordance with the provisions of the General Conditions.

D. Submittals required under this section include, but are not limited to, shop drawings or manufacturer's literature for the following:

1. Horizontal joint sealing material

2. Pipe connections and fittings

3. Pipe

4. Testing results

1.7 WARRANTY

A. The HDPE piping installation work performed shall have a warranty against faulty workmanship and materials for a period of one (1) year after the project is accepted by the Contracting Officer.

PART 2 - PRODUCTS

2.1 HDPE PIPE

A. Pipe shall be manufactured from a PE 4710 resin listed with the Plastic Pipe Institute (PPI) in TR-4. The supplier shall be ISCO Industries, LLC or approved equal. The resin material shall meet the specifications of ASTM D 3350-12 with a minimum cell classification of PE445474C or higher. Pipe shall have a manufacturing standard of ASTM F 714. The pipe shall contain no recycled compounds except that generated in the manufacturer's own plant from resin of the same specification from the same raw material. The pipe shall be homogeneous throughout and free of visible cracks, holes, foreign inclusions, voids, or other injurious defects.

1. 3 INCHES & SMALLER – Pipe shall have nominal IPS OD and be DR-11 (202 psi

WPR) unless otherwise specified in the Contract Documents.

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2.2 BUTT FUSION FITTINGS

A. Molded butt fusion fittings shall be in accordance with ASTM D-3261 and shall be manufactured by injection molding. Fabricated fittings made from HDPE pipe conforming to this specification are also acceptable. All fittings shall be pressure rated to provide a working pressure rating no less than 202 psi (DR-11). Fabricated fittings shall be manufactured using a McElroy Datalogger to record fusion pressure and temperature. A graphic representation of the temperature and pressure data for all fusion joints made producing fittings shall be maintained as part of the quality control. The pipe shall be homogeneous throughout and free of visible cracks, holes, foreign inclusions, voids, or other injurious defects. The supplier shall be ISCO Industries, LLC.

2.3 ELECTROFUSION FITTINGS

A. Electrofusion Fittings shall be PE4710 HDPE, Cell Classification of 445474C as determined by ASTM D-3350-12 and be the same base resin as the pipe. Electro fusion Fittings shall have a manufacturing standard of ASTM F-1055. Fittings shall be DR11 unless otherwise specified on the plans. The supplier shall be ISCO Industries, LLC or approved equal.

2.4 FLANGED AND MECHANICAL JOINT ADAPTERS

A. Flanged and Mechanical Joint Adapters shall be PE 4710 HDPE, Cell Classification of

445474C as determined by ASTM D-3350-12 and be the same base resin as the pipe. All flange adapters and back up rings shall be pressure rated to provide a working pressure rating no less than that of the 202 psi (DR-11). The supplier shall be ISCO Industries, LLC or approved equal.

2.5 MECHANICAL RESTRAINT

A. Mechanical restraint for HDPE pipe may be provided by mechanical means. Bell MJ Adapters and standard MJ adapters can be used. The supplier shall be ISCO Industries, LLC or approved equal.

2.6 DELIVERY, STORAGE, AND HANDLING

A. Materials shall be delivered to the site in the Manufacturer’s original, unopened containers and packaging, with labels clearly identifying product name and manufacturer.

B. All materials shall be stored properly and in accordance with Manufacturer’s instructions.

PART 3 - EXECUTION

3.1 GENERAL

A. Pipe and Fitting size shall be as indicated on the plans. Install as shown in accordance with manufacturer’s recommendations.

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3.2 JOINING

A. Butt Fusion: Sections of polyethylene pipe should be joined into continuous lengths on the jobsite above ground. The joining method shall be the butt fusion method and shall be performed in strict accordance with the pipe manufacturer's recommendations. The butt fusion equipment used in the joining procedures should be capable of meeting all conditions recommended by the pipe manufacturer, including, but not limited to, temperature requirements of 400-450 degrees Fahrenheit, alignment, and an interfacial fusion pressure of 75 PSI. The butt fusion joining will produce a joint weld strength equal to or greater than the tensile strength of the pipe itself. A data logger shall be used to record all fusion conditions.

1. All on site fusion welds to be performed using McElroy Datalogger and Weld Map as provided by ISCO Industries, LLC or approved equal.

2. On site fusion to be contracted to ISCO Industries, LLC or approved equal, or On Site

Fusion Technician to be ISCO Fusion Program Qualified or from a similar approved program; and to have Fusion Welded over 5000ft of Solid Wall HDPE pipe.

Qualification letter required.

a. Fusion Program Training for fusion qualifications shall be made available for hire to the public.

B. Sidewall Fusion: Sidewall fusions for connections to outlet piping shall be performed in accordance with HDPE pipe and fitting manufacturer’s specifications. The heating irons used for sidewall fusion shall have an inside diameter equal to the outside diameter of the HDPE pipe being fused. The size of the heating iron shall be ¼ inch larger than the size of the outlet branch being fused. Sidewall Fusion Welds shall only be performed by qualified personnel from ISCO Industries LLC or approved equal.

C. Mechanical: Bolted joining may be used where the butt fusion method cannot be used. Flange joining will be accomplished by using a HDPE flange adapter with a ductile iron back-up ring.

Mechanical joint joining will be accomplished using either a molded mechanical joint adapter or the combination of a Sur-Grip Restrainer and Pipe Stiffener as manufactured by JCM Industries, Inc. Either mechanical joint joining method will have a ductile iron mechanical joint gland.

D. Other: Socket fusion, hot gas fusion, threading, solvents, and epoxies may not be used to join

HDPE pipe.

3.3 QUALITY AND WORKMANSHIP

A. The pipe and/or fitting manufacturer’s production facility shall be open for inspection by the Contracting Officer or his designated agents with a reasonable advance notice. During inspection, the manufacturer shall demonstrate that it has facilities capable of manufacturing and testing the pipe and/or fittings to the standards required by this specification.

3.4 PIPE PACKAGING, HANDLING & STORAGE

A. The manufacturer shall package the pipe in a manner designed to deliver the pipe to the project neatly, intact and without physical damage. The transportation carriers shall use appropriate methods and intermittent checks to insure the pipe is properly supported, stacked and restrained during transportation such that the pipe is not nicked, gouged, or physically damaged.

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B. Pipe shall be stored on clean, level ground to prevent undue scratching or gouging. If the pipe must be stacked for storage, such stacking shall be done in accordance with the pipe manufacturer’s recommendations. The pipe shall be handled in such a manner that it is not pulled over sharp objects or cut by chokers or lifting equipment.

C. Sections of pipe having been discovered with cuts or gouges in excess of 10% of the pipe wall thickness shall be cut out and removed. The undamaged portions of the pipe shall be rejoined using the heat fusion joining method.

D. Fused segments of the pipe shall be handled so as to avoid damage to the pipe. Chains or cable type chokers must be avoided when lifting fused sections of pipe. Nylon slings are preferred.

Spreader bars are recommended when lifting long fused sections.

3.5 TRENCH CONSTRUCTION

A. Trenching, including earth excavation, bedding material and backfill, shall be done in accordance with Section 31 23 00, Excavation and Backfill.

3.6 PRESSURE TESTING OF PIPELINES

A. Pressure pipelines shall test in accordance with the specifications and requirements of the Contracting Officer and pipe manufacturer’s recommendations. The hydro-test shall be conducted in accordance with the “Inspections, Tests and Safety Considerations” document as available through PPI. If a system component such a fabricated or mechanical fitting has a pressure rating less than that of the pipe, the piping system shall be pressure tested to the manufacturer’s guideline on that component.

END OF SECTION 33 41 20