AWWA Has Published C! Updates Include: • High Performance Polyethylene Resin (PE) with Safety Factor ≥ 2. • Zero-leakage allowance for. Plastics Pipe Institute position statment on AWWA C High density polyethylene (HDPE) has been used for municipal and industrial water applications for almost 50 years. HDPE’s heat-fused joints create a leak free.
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A pipe may sometimes be subjected to net negative internal pressure because of the individual or combined effect of internal negative transients and external forces such as the water table. Occasional surge pressure POS: The party that manufactures, fabricates, or produces materials or products. The pipe manufacturer should aawwa consulted for this information.
Appendix A Pressure Class Selection Per AWWA C Pressure Class for HDPE
Rework materials shall meet the requirements of Sec. However, this standard also includes provision for specifying pipe with custom diameters and diameter ratios.
Handbook of Polyethylene Pipe, Washington, D. The following requirements may also be specified in the purchase contract: The party that provides the work and materials for placement or installation.
The inside and outside surfaces shall be semimatte to glossy in appearance and free from sticky or tacky material. Care shall be taken during shipment to prevent cuts, scratches, and other damage. The defined surge capacities and corresponding allowable changes in flow velocities are stated in Table B.
A vise with a minimum of 2 in. The PC values listed in the table identify the maximum working pressure ratings WPR of pipe made and classified in accordance with this standard.
AWWA C defines working pressure as “the maximum anticipated, sustained operating pressure applied to the pipe exclusive of transient pressures. When this situation exists, refer to the supplier for information on the hydraulic collapse resistance of the pipeline. Purchaser Options and Alternatives. The person, company, or organization that purchases any materials or work to be performed.
The flange thickness shall be supported by calculations based on a safety factor agreed on by the purchaser and the supplier. Fittings that are produced by injection molding shall be tested once per production run.
Peak pressure during a surge is equal to the sum of the pumping pressure and the transient surge pressure. This allowance assumes that the total number of surge events the piping will experience over its intended service life will not exceed one million.
Polyethylene piping shall not be joined by solvent cements, adhesives such as epoxiesor threaded-type connections. The dimensional tolerances for diameter and wall thickness shall be the same tolerance on a percentage basis as that specified for the average outside diameter and minimum wall thickness for the next smaller size. Each length of pipe shall be visually examined and checked for marking accuracy and legibility.
American Society of Civil Engineers. However, the designer expects the pipe to endure the particular operating conditions in which the recurring surge and occasional surge pressures both result from a sudden velocity change of up to 5 feet per second.
Standard code designation of the PE material Sec. Standard material code designation such as PE Use of Annex A procedures may not always be identical, depending on the certifier.
PPI updated position statement on AWWA C – High Country Fusion
Specific policies of the state or local agency. Color or color coding. The aawwa specified outside diameter is used for establishing pipe DR using inch—pound units. Nominal size and OD base such as 18 in. A shipment of resin material that is included under one material certification. American Water Works Association.
Fittings described by this standard include fittings intended to be joined to PE pipe by thermal fusion. The product shall be made from only the materials listed within this standard. Each fitting shall be visually checked inside and outside for defects as described in Sec. Joining methods shall be capable of conveying water at the design pressure of the piping system. Estimated surge pressures for PE pipe for a given sudden adwa in water flow velocity are listed in C.
The inside and outside surfaces shall be semimatte to glossy in appearance and free of sticky or tacky material. An engineer is designing a water system that operates at 85 psi and has some runs in it where the flow velocity is 4 fps. The use of solid-color nonblack or color-striped pipe is allowed. This standard classifies pipe in accordance with its pressure class PC. These three materials provide two series of pressure class ratings, one for PE or PE material and one for PE material.
MUNICIPAL & INDUSTRIAL
The five- second pressure test shall be as referenced in Sec. The inner surface of the pipe shall give no indications of brittle-like cracking or crazing when examined with the naked eye. The following tests relative to qualification of compounds and manufacturing processes and for quality assurance shall be conducted at or more often than the indicated intervals, unless otherwise specified by the purchaser.
News August 3, Any suitable equipment such as band saw, jigsaw, or router is useful for specimen preparation.
The fitting shall meet the five-second pressure awwaa Sec.