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HDPE Pipes & Fittings

HDPE pipes and fittings, which stand for High-Density Polyethylene pipes and fittings, are integral components in the field of modern fluid transportation and distribution systems. They are widely used in various industries, including water supply, drainage, natural gas transportation, industrial processes, and more.

HDPE fittings are designed to seamlessly connect to HDPE pipes. They come in a variety of types, including elbows, tees, couplings, reducers, and more, to facilitate changes in direction, branch connections, and transitions.

HDPE Electrfusion Fittings

HDPE Pipes
HDPE Electrofusion Coupler
HDPE Electrofusiong Equal Tee
HDPE Electrofusion 90° Elbow
HDPE Electrofusion 45° Elbow

HDPE buttfusion Fittings

HDPE 45° Elbow
HDPE 90° Elbow
HDPE End Cap
HDPE Equal Tee
HDPE Flange Adaptor(Stub End)

All You Need To Know About HDPE Pipes Fittings

HDPE (High-Density Polyethylene) is a thermoplastic polymer with high density, which contributes to its strength, stiffness, and durability. High-density polyethylene (HDPE) is a white powder or granular product. Non-toxic, odorless, crystallinity is 80%~90%, softening point is 125~135℃, The temperature range of HDPE is usually between -50℃ and 80℃.

HDPE piping systems are made from high-density polyethylene, a thermoplastic polymer known for its excellent strength, durability, and resistance to chemicals, corrosion, and UV rays. This material ensures a long service life and low maintenance costs. HDPE piping systems can be joined using either heat fusion or electrofusion. These joints are leak-free and ensure the integrity of the pipeline.

This article gives you everything you need to know about PE100-grade HDPE pipes and fittings. You will learn about the advantages, installation methods, applicable temperature range, uses, etc. of HDPE pipes and fittings.

HDPE Pipes Fittings

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HDPE piping system standards

High-density polyethylene (HDPE) pipes are manufactured and regulated according to various standards and specifications to ensure their quality, performance, and safety. Some of the key standards related to HDPE pipes include:

ISO 4427: ISO 4427 is an international standard that specifies the requirements for HDPE pipes and fittings used to convey water for human consumption, including drinking water applications. It outlines various parameters such as dimensions, pressure levels, and test methods.
GB/T13633-2000: GB/T13633-2000 Chinese standard, which includes specifications, material properties, processing properties, installation methods, and other requirements for HDPE pipes in water supply systems.
ASTM F714: ASTM F714 outlines requirements for HDPE pipe materials and quality control, including dimensions and tolerances for various pipe sizes. This standard is specific to HDPE pipes used for water conveyance.
DIN 8074/8075: These German standards provide specifications for polyethylene pipes used in water and sewerage systems. They cover dimensions, material properties, and test methods.
EN 12201: This European standard outlines the requirements for PE pipes and fittings for water supplies, including technical specifications, test procedures, and product classification.
BS EN 12201: This is the EN 12201 standard adopted in the UK and specifies the requirements for PE pipes and fittings for water supplies in the UK.
GSO 4427: The Gulf Standards Organization (GSO) standard defines specifications for HDPE pipes used in water and gas supply in the Gulf Cooperation Council (GCC) countries.
It is important to note that the specific standards applicable to a specific HDPE piping project may vary depending on location, intended use, and local regulations. Compliance with relevant standards and specifications is essential to ensure the quality, safety, and compliance of HDPE pipes in different applications.

PE 100 HDPE Features:

High Density: PE100 features high density, which provides excellent strength and durability.
High Molecular Weight: It has a high molecular weight, which contributes to its excellent toughness and resistance to environmental stress cracking.
Chemical Resistance: PE100 exhibits excellent resistance to a wide range of chemicals, acids and alkalis, making it suitable for applications involving corrosive substances.
Low Hygroscopicity: It has low hygroscopicity, which prevents it from degrading in humid environments.
UV Resistance: PE100 is resistant to ultraviolet (UV) radiation, making it suitable for outdoor applications and will not degrade due to sunlight exposure.
Flexibility: Although PE100 is relatively rigid, it still has a certain degree of flexibility, allowing it to withstand impact and deformation without breaking.

Rolled PE pipe

Learn more about HDPE pipes

Color: In many cases, HDPE pipes have colored stripes or markings to indicate their type or application. These colors are standardized, and you can typically find the color code information on the pipe manufacturer’s website or documentation. For example, blue stripes may indicate that the pipe is for potable water, while yellow stripes could denote gas distribution.

Size and Dimensions: The size and dimensions of the HDPE pipe are typically marked on the pipe’s surface. This includes details such as the pipe’s outer diameter (OD), inner diameter (ID), and wall thickness. Knowing these measurements can help you identify the pipe’s intended use.

Bar code or QR code: Some electrofused HDPE pipe fittings have bar codes or QR codes. After scanning, they can provide relevant information about the pipe heating temperature, heating time, etc. necessary for installation.

HDPE Pipes

SDR and stress relationship

SDR (Standard Dimension Ratio) is a standardized metric used to describe the relationship between the wall thickness and the outer diameter of high-density polyethylene (HDPE) pipes. SDR values help engineers and designers understand the performance characteristics of a pipe, particularly its pressure-bearing capacity. There is a direct relationship between SDR and a pipe's pressure capacity, which can be described as follows:
  1. Definition of SDR: SDR is the ratio of the outer diameter (OD) of a pipe to its wall thickness. Specifically, SDR = OD/Wall Thickness. For example, if the outer diameter of an HDPE pipe is 160 millimeters, and the wall thickness is 10 millimeters, its SDR is 160/10, which is SDR 16.

  2. SDR and Pressure Relationship: SDR values are commonly used to describe the pressure-bearing capacity of HDPE pipes. Lower SDR values indicate relatively thicker pipe walls, which can withstand higher internal pressures. Higher SDR values indicate relatively thinner pipe walls, which can withstand lower internal pressures.

  3. SDR and PN Rating: SDR values are often used in conjunction with PN (Pressure Number) to indicate the pressure rating of a pipe. Pipes with different SDR values may have different PN ratings, referring to the maximum internal pressure the pipe can withstand under specific conditions. In general, pipes with lower SDR values typically have higher PN ratings, indicating their ability to withstand higher pressures. The larger the SDR value, the smaller the pressure it can withstand. For example, what is marked on the PE pipe: SDR26 PN6, SDR21 PN8, SDR17 PN10, SDR13.6 PN12.5, SDR11 PN16, etc.

  4. Applications: Engineers typically select HDPE pipes with the appropriate SDR value based on the pressure requirements of specific applications. For instance, in water supply systems, sections requiring high-pressure tolerance would often use pipes with lower SDR values.

    In summary, SDR is an important parameter for describing the relationship between the wall thickness and outer diameter of HDPE pipes, and it is closely linked to a pipe’s pressure-bearing capacity. Lower SDR values generally indicate pipes capable of withstanding higher pressures, while higher SDR values suggest pipes suitable for lower-pressure applications. When choosing HDPE pipes, the selection of the appropriate SDR value and PN rating should be based on the specific pressure requirements of the application.

HDPE pipe size

Standards:GB/T13663-2000 Unit:mm
Nominal pressure 0.6MPa 0.8MPa 1.0MPa 1.25MPa 1.6MPa
Standard size table SDR26 SDR21 SDR17 SDR13.6 SDR11
Nominal outer diameter Wall Thickness
20 2 2.3
25 2.3 3
32 2.3 2.4 3
40 2.3 2.3 3 3.7
50 2.3 2.9 3.7 4.6
63 2.3 2.5 3.6 4.7 5.8
75 2.9 3.6 4.5 5.6 6.8
90 3.5 4.3 5.4 6.7 8.2
110 4.2 5.3 6.1 8.1 10
125 4.8 6 7.4 9.2 11.4
140 5.4 6.7 8.3 10.3 12.7
160 6.2 7.7 9.5 11.8 14.6
180 6.9 8.6 10.7 13.3 16.4
200 7.7 9.6 11.9 14.7 18.2
225 8.6 10.8 13.4 16.6 20.5
250 9.6 11.9 14.8 18.4 22.7
280 10.7 13.4 16.6 20.6 25.4
315 12.1 15 18.7 23.2 28.6
355 13.6 16.9 21.1 26.1 32.2
400 15.3 19.1 23.7 29.4 36.3
450 17.2 21.5 26.7 33.1 40.9
500 19.1 23.9 29.7 36.8 45.4
560 21.4 26.7 33.2 41.2 50.8
630 24.1 30 37.4 46.3 57.3

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HDPE Pipe for Potable Water Supply

What Are HDPE Pipes Used For?

Municipal engineering water supply system 

Building an indoor water supply system 

water treatment engineering piping system 

Gardening, irrigation

HDPE Pipes System Installation

There are two common installation and connection methods for HDPE pipe systems: Hot melt and electrofusion.

Butt Welding: Butt welding is a common method of joining HDPE pipes and fittings. It involves heating the ends of pipes and fittings and then pressing them together to create an even and leak-free connection. This method is suitable for larger-diameter pipes and is widely used in water and gas distribution systems. Hot melt connection includes two common methods: “butt welding” and “butt plugging”.

Electrofusion: Electrofusion involves the use of special electrofusion fittings with embedded heating elements. These fittings are connected to the pipes and an electrofusion control unit is used to heat and fuse them together. Electrofusion is a reliable method of joining HDPE pipes and fittings, especially in applications where precision is required.

Hot Melt Connection VS Electrofusion Connection

How to choose the appropriate link method?

Socket Fusion

Socket Fusion connection is to heat and soften the insertion end and socket end of the pipe respectively, then insert them quickly, and then a relatively strong connection can be achieved after cooling.

Small-Diameter Pipe: Hot Melt Sockets are generally available for small to medium-diameter HDPE pipe, typically in the DN20 (3/4 inch) to DN110 (4 inch) range.

Butt Fusion

Butt welding is to heat the end faces of two HDPE water supply pipes to a softened state, and then press them together to form a uniform fused joint between the pipes. Butt welding has the advantages of simple operation and high joint strength, but it requires high skills of the operator.

Large-diameter pipes: Hot melt butt welding is generally suitable for large-diameter HDPE pipes, usually for pipes above DN63 (2.5 inches).

Electrofusion Connection

Using a special electric fusion welding machine, the electric heating wire embedded in the inner surface of the electric fusion pipe is energized to heat it, so that the inner surface of the pipe fitting and the outer surface of the pipe are melted respectively, and after cooling to the required time, welding is achieved. the goal of. Electrofusion connection is suitable for HDPE water supply pipes of various diameters and has the advantages of good sealing performance and high joint strength. It should be noted that electrofusion connections have higher requirements for the stability of the power supply.
Pipe Diameter: Electrofusion couplings are typically available for small to medium-diameter HDPE pipes, such as the DN20 (3/4 inch) to DN400 (16 inch) range. If the pipe diameter is smaller, electrofusion is a quick and reliable method of joining.

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Hot Melt Connection VS Electrofusion Connection

1. In terms of operation, hot fusion welding is more complex and involves several steps such as cutting, cleaning the pipe ends, aligning them, welding with heat, applying pressure for cooling, and releasing pressure. It requires a high level of skill and typically needs a trained technician to operate. On the other hand, electrofusion welding only requires using a scraper to remove the oxidized layer from the outer surface of the pipe end and then attaching an electrofusion saddle. The operation is relatively simple.
2. The flexibility of electrofusion and hot fusion welding methods varies with the type of PE pipes. Different PE pipe types require different hot fusion welding machine models, and as the pipe diameter increases, the corresponding machine size also increases. This makes it inconvenient to carry larger machines for welding. In contrast, for welding different diameters of PE pipes, electrofusion welding machines have consistent models with small and convenient sizes.
3.Welding conditions for electrofusion and hot fusion welding differ. Hot fusion welding machines are relatively large in size, making them less suitable for narrow trenches or areas with steep slopes. Additionally, when using hot fusion welding machines, a certain hydraulic cylinder stroke is required during welding. Therefore, when dealing with fixed pipe ends, if the welding stroke is insufficient, it can be challenging to ensure welding quality. Electrofusion welding avoids these issues.
4. Welding quality varies between electrofusion and hot fusion welding. The quality of hot fusion welding can be directly observed through parameters like bead size and peel length. The weld has high strength and stability, and the quality of the welded pipeline can be largely ensured by inspecting the weld joints. Electrofusion welding, on the other hand, involves melting the two pipe ends from the inside using the electrofusion saddle. Due to the enclosure of the electrofusion saddle, the quality of the weld cannot be directly observed from the outside. The completion of the electrofusion welding process is indicated indirectly by observing the length of the marking pillar that rises in the inspection hole. Quality inspection of the weld joint in the pipeline can only be achieved through pressure testing.

HDPE Butt Fusion Welding Guide

When performing butt fusion welding on HDPE (High-Density Polyethylene) pipes and fittings, it's crucial to follow certain precautions and guidelines to ensure a successful and reliable joint. Here are some important considerations for HDPE butt fusion welding:

The Right Equipment: Make sure you have the right equipment with the right size and pressure capabilities for the HDPE pipe you are processing.
Material Compatibility: Make sure the HDPE pipe and fittings are of the same material grade (e.g. both PE100) to ensure compatibility.
Clean surfaces: Thoroughly clean pipe ends and fittings to remove any dirt, debris, or contaminants that could damage the weld.
Heating plate temperature: Set the heating plate to a temperature appropriate for the HDPE material you are using. Follow the manufacturer’s guidelines and standards (e.g. ISO 4427).
Pipe and Fitting Alignment: Accurately align pipes and fittings to be connected. The ends should be flush and positioned correctly to create an even blend.
Heating and Cooling Times: Follow recommended heating and cooling times based on pipe size and wall thickness. These times vary and should be adhered to for proper blending.
Pressure Control: Monitor and control fusion pressure during welding. Excessive or insufficient pressure will affect the quality of the joint.
Heating plate alignment: Make sure the heating plate is evenly aligned with the tube ends to promote even heating and blending.
Fusion Depth: Learn about the recommended blend depth. Typically 0.8 to 1.2 times the pipe wall thickness.
Cooling and Handling: Allow the splice to cool naturally without the need for external cooling methods. Handling the joint before it has cooled may result in improper fusion.

Quality Control: Inspect fused joints for visible defects such as voids, cold melt, or irregularities. Use non-destructive testing methods such as visual inspection and, when necessary, destructive testing to verify the integrity of the joint.

Record Keeping: Maintain records of the welding process, including fusion parameters, pipe and fitting details, and other relevant information.
By adhering to these guidelines, you can achieve high-quality butt welds of HDPE pipe and fittings, ensuring leak-free and reliable joints for a variety of applications.

HDPE Electrofusion Guide

When performing electrofusion installations on HDPE (high-density polyethylene) pipe and fittings, it is critical to follow certain precautions and guidelines to ensure a successful and reliable connection. The following are some important considerations when installing HDPE electrofusion:

Use the correct equipment: Make sure you use electrofusion equipment that meets relevant standards.
Clean Pipes and Fittings: Thoroughly clean the mating surfaces of pipes and fittings before electrofusion to remove dust, debris, or any contaminants that may affect the quality of the connection.
Choose the correct pipe fitting: Choose an electrofusion socket that matches the pipe diameter and specifications. Ensure that the socket and pipe are made of the same material and comply with applicable standards.
Follow temperature and time recommendations: Scan the QR code on the fusion key to get the manufacturer’s recommendations for setting proper preheat and cool-down times.
Align and Secure Pipe: Properly align the pipes and fittings to be joined, making sure the ends are flush and properly positioned to create an even and strong electrofusion joint.
Monitor welding parameters: During the electrofusion process, closely monitor and control the welding parameters, and carefully control the electrofusion temperature, including voltage and amperage, to ensure a successful connection.
Allow Proper Cooling: Allow the electrofusion joint to cool naturally without the need for external cooling methods. Premature handling or exposure to external elements may compromise the integrity of the connection.

Check for defects: Inspect electrofusion joints for visible defects, voids, or any irregularities. Use non-destructive testing methods such as visual inspection and, if necessary, destructive testing to verify the quality of the joint.

Prioritize safety measures: Follow safety precautions and wear appropriate personal protective equipment (PPE) when working with electrofusion equipment and hot surfaces..

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