HDPE pipe terminology - everything you need to know

Are you unfamiliar with the terminology related to HDPE piping? You’re in luck. We’ve compiled a comprehensive collection of pivotal terms and definitions that are essential for understanding the world of HDPE pipes. Dive in for some insightful details and feel free to reach out to us for any additional information or to discuss your specific HDPE requirements.

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HDPE Overview

High-density polyethylene (HDPE) is a thermoplastic polymer derived from the monomer ethylene. Recognized for its excellent strength-to-density ratio, HDPE piping is lightweight, flexible, cost-effective, and resistant to corrosion. Beyond pipes, HDPE is utilized in crafting plastic bottles, geomembranes, shopping bags, toys, containers, and even plastic lumber.

Key Terminologies in HDPE

IPS and DIPS: Iron Pipe Size (IPS) denotes the nominal diameter of the pipe, indicating that a 6-inch IPS pipe has an internal diameter of six inches. Ductile Iron Pipe Size (DIPS) pertains specifically to ductile iron pipe sizes. Generally, IPS relates to black iron or carbon steel pipes, while DIPS is concerned with cast or ductile iron. IPS pipes range from ¾ inch to 65 inches in diameter, whereas DIPS pipes range from 4 inches to 36 inches.

CTS and Bend Radius

CTS: Copper Tube Size is primarily applicable in plumbing and potable water systems. The outer diameter (OD) of copper is typically 1/8 inch larger than its nominal size, a specification that also applies to HDPE conforming to CTS dimensions. Notably, for water applications, HDPE pipe can be as small as ¾ inch OD.

Bend Radius: The bend radius measures to the inner curvature and signifies the minimum radius that can be applied to the pipe without causing damage or shortening its lifespan. LDPE's flexibility allows for a smaller bend radius compared to its competitors, but breaching the specified bend radius can jeopardize structural integrity and performance.

Understanding Dimension Ratio

Dimension Ratio (DR): DR is a critical measurement, being the ratio of the pipe's outside diameter to its minimum wall thickness. A consistent pressure rating applies for the same material and application as dimensions vary.

Standard Dimension Ratio (SDR)

SDR: Established by ASTM International, standard dimension ratios are based on a defined number series including 32.5, 26, 21, and others, with each SDR representing a 25% variation in minimum wall thickness.

Calculating SDR: SDR is expressed using the formula SDR = dn/en, where 'dn' represents the nominal outside diameter and 'en' is the nominal wall thickness.

Additional Technical Specifications

Carbon Black (CB): Carbon black is an additive employed to enhance the strength and overall performance of HDPE pipes by improving UV resistance and minimizing moisture absorption.

Coefficient of Friction: This metric assesses the friction level between two surfaces; a decreased coefficient signifies reduced wear or damage in piping.

Surge Pressure

Surge Pressure: According to the American Water Works Association standard AWWA C901, surge pressure in HDPE pipes can be categorized as recurring or occasional, with safe peak pressures defined as 1.5 and 2.0 times the pipe's rating, respectively.

Temperature Derating and Certification

Temperature Derating: As temperatures rise, materials must often be ‘derated’ to account for decreased strength at higher temperatures.

FM Approved: FM Approvals provides rigorous testing and certification for products, ensuring that FM approved-HDPE pipes have undergone extensive evaluation.

Seismic Loading Insights

Seismic Loading: This principle relates to earthquake engineering, focusing on the application of seismic oscillation on structural elements. Per the Electric Power Research Institute, seismic loads on piping can arise from wave propagation in the soil.

Conclusion: The Future of HDPE

United Poly Systems specializes in quality HDPE pipe production suited for a diverse range of industries. Our products are designed to cater to the growing demand driven by infrastructure improvements. We provide customizable HDPE options, with quick delivery across major U.S. markets.

For further inquiries on HDPE pipe solutions tailored to your needs, please don't hesitate to contact us!

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