Omar Khalid
Plastic water pipes are classified by their material and are popular for their reliability, flexibility, and corrosion resistance. The most common types of plastic water pipes include PEX, ABS, PVC, CPVC, and HDPE. Each offers unique benefits, such as ease of installation, durability, and suitability for various applications, from residential plumbing to industrial systems. Understanding the different types of plastic water pipes is essential for effective and long-lasting plumbing solutions.
| Characteristics | Values |
|---|---|
| Name | Polyvinyl chloride pipes (PVC) |
| Other names | Polyethylene pipes, plastic water pipes |
| Composition | Polyvinyl chloride (PVC) |
| Variants | Cross-linked polyethylene (PEX), chlorinated PVC (CPVC), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE) |
| Applications | Household plumbing, water lines, wastewater, chemicals, compressed gases, irrigation, potable water supply, drainage, sewerage, industrial effluent conduits, hot water drainage systems, firewater |
| Pros | Affordable, durable, recyclable, lightweight, easy to work with, flexible, corrosion-resistant, chemically stable, good longevity |
| Cons | Becomes brittle over time when exposed to sunlight or high heat, lack of heat resistance, potential health risks due to leaching of chemicals, not suitable for hot water lines |
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What You'll Learn
PEX (Cross-linked polyethylene)
PEX stands for cross-linked polyethylene, a type of plastic water pipe. It is one of the newest types of plastic plumbing pipes available today. PEX pipes are made from high-density polyethylene (HDPE) and contain cross-linked bonds in the polymer structure, changing the thermoplastic to a thermoset. Cross-linking can be achieved during or after the extrusion of the tubing. The flexibility of PEX pipes allows plumbers to run long lines with very few connection sites, making installation quicker and easier than with other pipe types.
PEX pipes are used predominantly in building services pipework systems, hydronic radiant heating and cooling systems, domestic water piping, insulation for high-voltage electrical cables, and baby play mats. They are also used for natural gas and offshore oil applications, chemical transportation, and transportation of sewage and slurries. PEX is often used as an alternative to polyvinyl chloride (PVC) or copper tubing for residential water pipes.
One of the main advantages of PEX is its flexibility, which makes it easier to install than other types of pipes. It also has high thermal stability and improved creep behaviour, maintaining high strength and hardness at very high temperatures compared to thermoplastic polyethylene. PEX pipes are also resistant to corrosion and have improved chemical and mechanical properties.
PEX pipes are well-suited for use in solar thermal systems due to their thermal resistance and durability. They are also used in the automotive industry, particularly for the production of various automobile parts and components. In the construction industry, PEX is used for pipes and wiring, and its flexibility, corrosion resistance, and ease of installation make it an attractive option for construction projects.
However, PEX pipes do have some drawbacks. They are susceptible to oxidative degradation and embrittlement when exposed to hot chlorinated water, and can fail when exposed to chlorine within the water or overexposure to sunlight before installation.
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PVC (Polyvinyl chloride)
Polyvinyl Chloride (PVC) is a high-strength thermoplastic material that is widely used in pipes, wires, cables, and medical devices. It is the third-most-widely produced synthetic plastic polymer in the world. PVC is available in many forms, including rigid (unplasticized) and flexible varieties. It is commonly used in construction, domestic, packaging, automotive, medical, toys, clothing, wires, and cables. PVC pipes are among the most common plastic plumbing pipes today, known for their affordability, durability, and recyclability. They can last up to 70 years without rusting or corroding and are free from bisphenol A (BPA), making them suitable for creating home water lines. However, PVC pipes have limited heat resistance and can become brittle when exposed to sunlight or high temperatures, making them unsuitable for hot water applications.
PVC is a versatile and cost-effective material with excellent electrical insulation properties. It is produced through suspension polymerization, where surfactants (soaps) are used to disperse the vinyl chloride monomer in water. The polymerization process involves water-soluble initiators, resulting in solid, smooth-surfaced primary particles. These particles form aggregates with a mean size of 40-50 µm, ranging from 0.1-100 µm. The aggregates' irregular shapes contribute to the unique properties of PVC.
PVC pipes are easy to work with and can be joined using various pipe fittings, glues, and cements. They are often white in colour and are commonly used for plumbing and drainage systems. PVC has become a popular replacement for metal piping due to its strength, durability, ease of installation, and low cost. It is a thermoplastic material that can be moulded into different shapes, making it suitable for creating pipes, fittings, valves, and other liquid handling supplies.
While PVC is a widely used material, it is important to consider its limitations. PVC pipes are not suitable for hot water applications as they can soften and weaken at temperatures above 140 degrees Fahrenheit (60 degrees Celsius). For hot water lines, CPVC (Chlorinated Polyvinyl Chloride) pipes are often recommended due to their increased heat resistance. CPVC pipes can withstand temperatures up to 200 degrees Fahrenheit (93 degrees Celsius) and are less prone to becoming brittle over time. However, CPVC pipes are slightly more expensive and have a shorter lifespan of about 20 to 25 years.
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LLDPE (Linear low-density polyethylene)
LLDPE, or Linear low-density polyethylene, is a type of plastic water pipe. It is the most common type of plastic water pipe and is used for potable water, food and beverage, and pneumatic compressed air applications. LLDPE is more robust than traditional low or medium-density polyethylene and is recommended for use with cold and intermittent hot water. It offers excellent pressure and temperature ratings and has outstanding resistance to environmental stress cracking.
LLDPE is a semi-crystalline polymer with many short branches on its main molecular chains. This means that these linear molecules do not become entangled as easily as LDPE and HDPE. LLDPE plastic is typically made from one of three different co-monomers classified as alpha-olefins: octene, hexene, and butene. Octene is the highest-performance co-monomer and has the longest branch chains, while butene has the shortest branch chains and is the most common due to its lower cost. Various blends of these co-monomers are also used to adjust the properties of LLDPE plastic.
LLDPE is manufactured via the copolymerization of ethylene and an alpha-olefin co-monomer. The Unipol process, or gas phase process, is the most common method for polymerization. During this process, the catalyst (either Ziegler-Natta or metallocene) and ethylene are blown into a fluidized bed reactor where copolymerization occurs. The polymer then settles at the bottom and exits the reactor as a powder, which is then pelletized and processed using methods such as blow molding, film extrusion, or injection molding.
LLDPE has a high shrinkage rate due to its semi-crystalline nature, taking up more volume in its melt state than in its solid state. It also has unique melt flow properties (rheology) and is less shear-sensitive than LDPE, with a faster stress relaxation of polymer chains during extrusion. LLDPE is not environmentally friendly and is difficult to recycle, contributing to a large percentage of environmental pollution. However, it can be recycled into new items such as industrial bins, composite lumber, flooring, and new plastic films.
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CPVC (Chlorinated PVC)
Chlorinated Polyvinyl Chloride (CPVC) is a thermoplastic produced by chlorination of polyvinyl chloride (PVC) resin. CPVC is a PVC homopolymer that has been subjected to a chlorination reaction. Typically, chlorine and PVC react according to a basic free radical mechanism, which can be brought about by various approaches using thermal and/or UV energy.
CPVC differs from PVC in that it has a higher chlorine content, with approximately 40% of the bonding sites on the backbone filled with chlorine atoms, compared to 25% in PVC. This increased chlorine content enhances the heat resistance of CPVC, making it suitable for hot water lines. CPVC can also withstand corrosive water at temperatures up to 40–50 °C higher than PVC, contributing to its popularity in water-piping systems. The maximal operating temperature of CPVC is 200 °F (93 °C).
CPVC is a flexible and versatile compound that can be manufactured into various product forms using standard molding techniques, such as extrusion and injection moulding. It is easy to weld and cut, making it ideal for applications in chemical processing plants, residential homes, and hotel plumbing. CPVC is also inherently inert to acids, bases, and salts, which makes it a suitable alternative to metal piping in certain conditions.
However, it is important to note that the incineration of CPVC can result in the creation of dangerous chlorinated dioxins and polychlorinated dibenzofurans due to its chlorine content. CPVC pipes are also slightly more costly than PVC pipes, with a lifespan of about 20 to 25 years.
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ABS (Acrylonitrile Butadiene Styrene)
ABS, or Acrylonitrile Butadiene Styrene, is a common thermoplastic polymer used for injection moulding applications. It is a popular material due to its low production cost and ease of machining. ABS is derived from three monomers: acrylonitrile, butadiene, and styrene, which, when combined, create a tough and durable product. Acrylonitrile provides chemical and thermal stability, butadiene adds toughness and strength, and styrene gives the finished polymer a glossy finish.
ABS has a range of desirable physical attributes, including superior hardness, gloss, toughness, and resistance compared to pure polystyrene. It is impact-resistant, rigid, and can withstand heavy use and adverse environmental conditions. These qualities make it suitable for a wide range of applications, from computer keyboard keys to protective headgear and musical instruments.
ABS is also widely used in the automotive industry for items such as plastic alloys, decorative interior car parts, and automotive components. In construction, ABS is used to manufacture plastic tubing and corrugated plastic structures. It can be easily cut to size and comes in various colours and finishes, making it versatile for different projects.
One of the key advantages of ABS is its recyclability. It can withstand multiple heating and cooling cycles without losing its structural integrity, making it a sustainable choice for manufacturers. Additionally, ABS can be electroplated, moulded, sanded, and shaped to create a desired form and effect, further enhancing its versatility.
While ABS offers numerous benefits, there are some concerns about its decomposition at high temperatures. If exposed to temperatures of 400°C (750°F), ABS can decompose into its constituents, including butadiene and acrylonitrile, which are known to be carcinogenic to humans. Ultrafine particles (UFPs) produced during processes like 3D printing have also been linked to potential adverse health effects. Therefore, caution is necessary when working with ABS under certain conditions to ensure safe handling and disposal.
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Frequently asked questions
The different types of plastic water pipes include Polyvinyl Chloride (PVC), Cross-Linked Polyethylene (PEX), Chlorinated Polyvinyl Chloride (CPVC), Linear Low-Density Polyethylene (LLDPE), and High-Density Polyethylene (HDPE).
PVC is commonly used for main water lines, but not for hot water applications as it warps at temperatures higher than 140°F. PVC is also used for drainage and vent lines within the house.
PEX is used in home plumbing systems for hot and cold water pipes, as well as freshwater kitchen and bathroom systems. PEX is also used in hydronic heating systems and compressed air systems.
CPVC is commonly used in industrial plumbing and residential hot water lines that standard PVC is not suitable for. CPVC can also be used in HVAC systems to carry hot and cold water and refrigerant lines.
When choosing a plastic water pipe, it is important to consider the chemical compatibility, temperature rating, and pressure of the fluid in the application. It is also essential to check local regulations, as certain pipe types may not be permitted in specific locations.
