What is High-Density Polyethylene (HDPE) Pipe Used For?
What is High-Density Polyethylene (HDPE) Pipe Used For?
In the vast landscape of modern infrastructure, the choice of piping material plays a crucial role in ensuring efficiency, durability, and sustainability. Among the many options available, High-Density Polyethylene (HDPE) pipe stands out as a versatile and reliable solution for a wide range of applications. From municipal water distribution to industrial fluid transport and everything in between, HDPE pipes have earned their place as a cornerstone of modern engineering.
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What is High-Density Polyethylene (HDPE) Pipe Used For?
What is HDPE?
High-Density Polyethylene (HDPE) pipe is a flexible piping solution used for various projects. HDPE is made from thermoplastic, which is made with polymer resin. HDPE piping is mainly used for conveying fluid as well as gas at low temperatures. This includes hazardous wastes, slurry, and also stormwater. This is why HDPE has a distinguished and long service history in the oil, mining, gas, and water industries, among others.
Although it has been around for ages, recently many developments and construction companies have chosen the high-density polyethylene pipe option over the long-standing, standard PVC piping option. High-density polyethylene pipe has specific features that make it easily identifiable and also useful. These key features of HDPE pipes are what make them beneficial, from being easier to carry around on-site to the fewer fittings that are required in the assembly and installation processes, which makes them less labor-intensive.
Types of HDPE Pipes
The three types of HDPE pipes to choose from include:
- Single-wall polyethylene pipes Single-wall pipes of different diameters can be used at pressures between two and forty bars.
- Double-wall polyethylene pipes Double-wall polyethylene piping is also known as corrugated polyethylene piping. They have two walls with the outer layer being corrugated and the inner layer which is smoother allowing for the easier flow of fluids through the piping. The corrugation of the outer layer makes the pipe a lot more resistant to pressure and impact while still allowing for the flexibility of the pipe.
- Spiral polyethylene pipes Spiral polyethylene pipes are very similar to double-wall pipes, the main difference coming in the production of the pipes. The spiral piping has a corrugated outer layer but can withstand slightly higher pressures. Spiral corrugated pipes are generally connected with extrusion attachments.
Uses of HDPE Pipes
This innovative piping is used in infrastructure construction. HDPE pipes are used as or in:
- High-pressure pipelines
- Water mains
- Gas mains
- Sewer mains
- Slurry transfer lines
- Rural irrigation
- Fire system supply lines
- Electrical conduit
- Communications conducting
- Stormwater pipes
- Drainage pipes
Advantages and Disadvantages of HDPE Pipes
The use of HDPE High-Density Polyethylene piping systems is becoming more of a first choice for people in the industrial sector and construction industry. People are including the use of HDPE pipes because it has incredible benefits.
HDPE pipes are of high quality, which makes them an extremely reliable piping option. Fittings for HDPE are readily available and easily attached to the piping making it easier for the setup of the system. HDPE pipes are also flexible, so they allow for easy installation of the piping systems for contractors, making installation simpler and thereby quicker.
Being lightweight, DDPE pipes are also easier to load, transport, offload and move around for various projects as well as installations on site. Polyethylene pipes are also made to have a bending radius which allows for the piping to have good resistance to pressure and impact at low temperatures. One of the most important benefits of HDPE pipes is that they are very resistant to different chemicals, especially acidic ones, but of course only at lower temperatures.
Advantages of HDPE Pipes
In addition to being impact and chemical-resistant, as well as durable in low temperatures, other advantages include:
- Cheaper than other piping solutions
- Preserving the safety and quality of potable (drinking) water
- Long-term reliability
- Resistant to corrosion, tuberculation, and deposits
- Freeze damage resistant in colder climates
- Low value, making them pointless to steal from construction sites
- Durable and hardy which increases their cost-effectiveness
- Flameless joining of sections and fittings
- Made from eco-friendly, recyclable material
- Heat fusible ensuring a virtually leak-free performance
- Erosion resistant so good for transporting liquids containing non-soluble elements
- Lightweight, especially compared to concrete as well as steel pipes. Therefore, lowering labor requirements.
- Able to withstand compressive stress as well as tension stress.
- Resistant to fluids and gases at lower temperatures
- Flexibility makes elbows and also bends redundant
Disadvantages of HDPE Pipes
Though there are not many disadvantages to HDPE pipes, they are certainly important to be familiar with. The disadvantages include:
- High thermal expansion
- Low weather resistance
- Vulnerable to stress cracking
- Tricky to bond
- Flammable
- Poor high-temperature conduction
- Low strength/stiffness
Installation and Maintenance of HDPE Pipes
Proper installation and maintenance practices are essential for maximizing the performance and lifespan of HDPE piping systems. Heres what you need to know:
- Installation Methods: HDPE pipes can be joined using various methods, including butt fusion, electrofusion, and mechanical fittings. Butt fusion involves heating the ends of the pipes and then pressing them together to form a seamless joint. Electrofusion utilizes specialized fittings with embedded heating elements to create strong, leak-proof connections. Mechanical fittings provide a convenient alternative for applications where heat fusion is not feasible.
- Professional Expertise: While HDPE pipe installation can be performed by trained personnel, its important to engage qualified professionals with experience in handling HDPE materials and equipment. Proper fusion techniques, surface preparation, and alignment are critical to ensuring the integrity of the piping system.
- Maintenance Requirements: HDPE pipes are generally low-maintenance, but periodic inspections are recommended to identify any signs of damage, degradation, or stress concentration. Regular maintenance tasks may include visual inspections, leak detection, and cleaning of the piping system. Additionally, preventive measures such as cathodic protection or protective coatings may be employed in corrosive environments to enhance the longevity of HDPE pipes.
- Repair Techniques: In the event of accidental damage or wear, HDPE pipes can be repaired using various methods, such as electrofusion patching, hot tap saddles, or compression fittings. Prompt identification and repair of defects can help prevent costly downtime and mitigate potential environmental risks associated with leaks or failures.
By adhering to proper installation procedures and implementing proactive maintenance practices, HDPE piping systems can deliver reliable performance and environmental sustainability throughout their service life.
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Choosing Between HDPE and PVC – A Detailed Guide
HDPE and PVC pipe have several similarities, but there are important differences that you should understand when choosing a product. At Piedmont Plastics, we want you to have the right plastic for your specific application, and thats why we want to point out these differences.
Both PVC and HDPE are durable and lightweight options for piping in residential and commercial buildings. They carry a low risk of leaks, can carry gas and liquid, and can be used underground and in the water. Both are corrosion-proof and resistant to bacteria and chemical buildup as well. Yet, despite these similarities, distinct differences can dictate which choice is best for your needs.
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Differences Between PVC & HDPE
PVC and HDPE have some distinct differences. In general, HDPE is a flexible, strong, and impermeable plastic. PVC is also strong but less flexible and more prone to cracking and failure.
Both pipes can handle standard water pressure surges common in pipelines. However, with PVC, the pipe can handle 100 psi above its pressure class. With HDPE, the pipe can withstand twice the pressure class. In addition, PVC can handle 5.5 feet per second of flow rate before changing its water pressure rating, while HDPE can handle 14 feet per second. Overall, HDPE is 2,500 more resistant to cracking and failure due to water hammer and fatigue.
PVC has a higher pressure class for static water, but HDPE has a higher working pressure rating. In addition, when creating pipe systems, HDPE has a greater bend radius, so it works well for applications that require a curved or bent design.
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These two materials also vary in how they are joined. For example, HDPE is joined with heat fusion, while PFC must have a spigot or bell joint with cement. This means HDPE has less of a risk of leaks at the joints.
Finally, HDPE is more durable under extreme conditions. Unlike PVC, it is completely UV resistant and can be installed in extreme temperatures ranging from -40 to 140 degrees. It also has a service life of over a century.
Different Applications of PVC & HDPE Pipe
While the most common use of HDPE and PVC pipe is plumbing, these products have additional applications:
Common HDPE Applications
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Water and gas mains
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Sewage
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Irrigation
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Slurry transfers
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Stormwater and drainage
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Electrical and communications conduits
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Mining applications
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Firewater
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Brine lines
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Process chemicals
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Ocean clean-up
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Outtfall lines
Common PVC Applications
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Water mains
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Chemical transfers
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Stormwater drainage
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Sewage
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Household plumbing
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Irrigation
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Underwater Piping
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Exhust fumes
Chemical Resistance and Compatability
HDPE and PVC differ in their resistance to certain chemicals. They have the same chemical resistance for the following:
Acetic acid, Ammonium Sulfate, Ammonium Hydroxide, Borax, Calcium hypochlorite, Ferrous sulfate, Hydrochloric acid, Hypochlorous acid, Phosphoric acid, Sodium bicarbonate, Sodium carbonate, Sodium chloride, Sulfur, Urine, Water, and Saltwater.
Some chemicals had distinct differences. These include:
Chlorine at 50+ ppm: PVC is more resistant
Nitric acid: HDPE is more resistant
Lubricating oil: HDPE is more resistant
Sodium HypoChlorite: PVC is more resistant
Sulfuric Acid: HDPE is more resistant at most concentrations
Which Is More Cost -Effective: HDPE or PVC?
Even though HDPE is more durable and flexible than PVC and lasts longer without degradation, it costs a little more than its competition. However, when considering cost-effectiveness, you must look beyond the purchase price.
With HDPE, you dont have to use cement to join pieces. Because it is joined with heat, the process requires minimal wait time. As a result, you do not have to wait for the cement to cure, and you can use your new pipes more quickly.
HDPE is also more cost-effective to transport. You do not have to protect it from sunlight as you do with PVC because it is UV resistant. This combination of less cost and time to install and less cost for transportation helps counter the higher purchase cost.
Finally, HDPE will last longer than PVC in most applications. Not having to replace and repair pipes as often adds up to major cost savings. In light of these factors, HDPE is typically the more cost-effective option.
Get Expert Guidance
If you are curious about whether to choose PVC or HDPE, the sales professionals at Piedmont Plastics can help. Our knowledgeable team will help you learn more about the benefits and drawbacks of each material so that you can choose the best one for your application. Reach out today.
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