Rajan Wilcox
PEX tubing is a flexible plastic piping made of cross-linked polyethylene. It is commonly used for external underground gas lines and to transport oil, natural gas, hazardous chemicals, and sewage or slurry for waste treatment. PEX tubing is also used for waterproofing electrical wires and protection of underground power cables. While PEX tubing is approved for use with some fuels, there are concerns about its durability and possible permeation by outside contaminants such as gasoline or solvents. Some sources suggest that PEX tubing should not be used for fuel oil lines, while others claim that it can be used temporarily. It is important to consider the minimum radius that PEX can be bent at, as well as its compatibility with the fuel.
| Characteristics | Values |
|---|---|
| Use case | PEX tubing is commonly used for external underground gas lines that deliver large amounts of gas to serve a whole neighborhood. It is also used to transport oil, natural gas, hazardous chemicals, and sewage or slurry for waste treatment. |
| Pros | PEX tubing is 75% cheaper than other piping options and often provides less intensive installation, resulting in lower labor costs. It can also be routed from point to source without splicing or cutting, making it easier and less messy to use. |
| Cons | PEX is a soft material that can be damaged by nails, rodents, and other external factors. It is also not resistant to UV light, so extended exposure to direct sunlight must be avoided. |
| Other considerations | PEX tubing might not be allowed by your building codes, and it may not be the best material for your specific needs. |
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What You'll Learn
- PEX tubing is not resistant to UV light
- PEX tubing is suitable for hot and cold water applications
- PEX tubing is flexible and rated for high pressure
- PEX tubing is made of polyethylene with a stronger bond between polymer chains
- PEX tubing is used to transport oil, natural gas, hazardous chemicals, and sewage
PEX tubing is not resistant to UV light
While PEX tubing can be used for fuel oil lines, it is important to note that it is not resistant to UV light. This means that PEX tubing should not be exposed to direct sunlight for extended periods, typically more than a few weeks.
The sensitivity of PEX tubing to UV light is due to the material's composition, which includes plastic and polyethylene. Certain plastics are susceptible to degradation caused by ultraviolet waves in natural sunlight. This degradation may not be visible to the naked eye, but it can reduce the service life of the tubing.
To address this issue, manufacturers have developed UV-resistant PEX tubing by incorporating UV stabilizers or carbon black into the HDPE compound during production. Alternatively, they may add UV-blocking and absorbing barrier layers to the exterior of the tubing wall. These measures help protect the tubing from incidental sun exposure during installation.
When choosing PEX tubing for fuel oil lines, it is important to look for products that have been tested and certified for UV resistance. The ASTM F2657 standard provides a recognized test method for evaluating UV resistance in PEX tubing, ensuring its durability and longevity in outdoor applications.
In conclusion, while PEX tubing can be used for fuel oil lines, its lack of UV resistance should be considered. By selecting UV-resistant PEX tubing and avoiding prolonged direct sunlight exposure, you can maintain the integrity and effectiveness of the tubing over its service life.
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PEX tubing is suitable for hot and cold water applications
PEX tubing is a popular choice for plumbing applications, suitable for both hot and cold water use. It is made from cross-linked polyethylene, a flexible form of plastic discovered by German scientist Thomas Engle in 1968. PEX tubing first arrived in the US in the 1980s for radiant floor heating systems and has since become a common choice for water supply systems.
There are three main types of PEX tubing: PEX-A, PEX-B, and PEX-C, which are differentiated by their manufacturing processes. PEX-A is the most flexible type, while PEX-B is the most common, manufactured using the silane method of cross-linking. PEX-C, on the other hand, has been associated with the development of cracks due to early oxidation and is generally not recommended for plumbing applications.
When selecting PEX tubing for plumbing, it is crucial to ensure it meets specific standards for potable water safety, lead-free requirements, and chlorinated water compatibility. For example, the Everhot Non-barrier PEX tubing complies with the US Safe Drinking Water Act and is NSF-certified for potable water applications.
While PEX tubing is a popular choice for plumbing and heating applications, it is not recommended for fuel oil lines. Some sources suggest that PEX may be suitable for temporary use, but others advise against it due to concerns about durability and possible permeation by outside contaminants such as gasoline or solvents.
In summary, PEX tubing is a versatile and popular choice for hot and cold water applications in plumbing and heating systems, but it is important to select the appropriate type and ensure it meets the necessary standards for potable water safety and compatibility with chlorinated water. For fuel oil lines, other materials like copper pipe and solder fittings are generally preferred.
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PEX tubing is flexible and rated for high pressure
PEX tubing is a common material used in residential plumbing systems. It is a flexible pipe that can expand during the initial pressurization of the system, causing a drop in pressure reading. This flexibility is highest in PEX-a, which is made using the Peroxide, or Engel, method. PEX-b, the most common type, is formed using the silane, or moisture cure, method, while PEX-c is created using the electronic irradiation, or cold, method of cross-linking.
The flexibility of PEX tubing allows it to be bent to a minimum radius, which is an important consideration when using it for fuel lines, as it may cause problems where lines come down off the top of the tank and then head forward.
In terms of pressure, PEX tubing is designed for high-pressure applications. The maximum working pressure indicates the highest anticipated operating pressure, and it is important to comply with local codes and manufacturer instructions when pressure testing. Concrete slabs, for example, require a pressure of 30 psi during the pour to maintain system integrity.
While PEX tubing is flexible and rated for high pressure, there are some concerns about its durability and possible permeation by outside contaminants such as gasoline or solvents. It is also important to note that PEX tubing is not resistant to UV light, so extended exposure to direct sunlight must be avoided.
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PEX tubing is made of polyethylene with a stronger bond between polymer chains
PEX tubing is a type of plastic pipe made of cross-linked HDPE (high-density polyethylene). The "X" in PEX denotes the chemical or physical modification of the polyethylene material's molecular structure, resulting in cross-linked bonds between carbon atoms. This process forms permanent links between the polymer chains, creating a high-performing pipe.
The cross-linking process can occur during or after the extrusion of the tubing, and it enhances the chemical, thermal, and mechanical properties of the polymer. According to ASTM Standard F876, the required degree of cross-linking should be between 65% and 89%. Achieving a higher degree of cross-linking may lead to material brittleness and stress cracking, while a lower degree may result in inferior physical properties.
There are several methods to prepare PEX, including the silane method, electron beam processing, and the Engel method. The silane method, also known as the "moisture cure" method, involves cross-linking in a secondary post-extrusion process, forming cross-links between a cross-linking agent. Electron beam processing, on the other hand, was introduced in the 1970s and provides a "cold" cross-linking process below the crystal melting point. The Engel method, similar to electron beam processing, offers cross-linking either during or after extrusion.
While PEX tubing is commonly used for potable and non-potable plumbing applications, its compatibility with fuel systems has been questioned. Some sources suggest that PEX may not be suitable for fuel service due to potential issues with permeation and durability. However, others indicate that PEX tubing does not have long-term adverse effects from the hydrocarbons in gasoline or alcohol additives. It is important to note that PEX tubing is not resistant to UV light, and direct sunlight exposure should be avoided for extended periods.
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PEX tubing is used to transport oil, natural gas, hazardous chemicals, and sewage
PEX tubing, also known as cross-linked polyethylene, is a type of plumbing tubing that can be used to transport oil, natural gas, hazardous chemicals, and sewage. PEX tubing is a popular choice for plumbers due to its flexibility, resistance to crimping and corrosion, and ease of installation.
When it comes to oil, PEX tubing can be used as a temporary solution for oil lines, but it is not recommended as a permanent solution. Some people have expressed concerns about using PEX tubing for oil lines, suggesting alternatives like copper pipes.
For natural gas, PEX is a relatively uncommon material for in-home gas lines. However, it is commonly used for external underground gas lines that deliver gas to entire neighbourhoods. PEX is a type of PE (polyethylene) piping, which is a flexible plastic material that is well-suited for gas lines. Other materials used for gas lines include steel and copper, but these can react negatively with hydrogen sulfide present in natural gas.
Regarding hazardous chemicals, there are concerns about the safety of PEX tubing, particularly the potential for chemicals like BPA, MTBEs, and VOCs to leach into drinking water. However, PEX tubing is still used for waterproofing electrical wires and protecting underground power cables.
Finally, PEX tubing is suitable for transporting sewage or slurry for waste treatment. PEX tubing's flexibility and ease of installation make it a popular choice for plumbers and it can be an effective solution for replacing existing pipes in homes.
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Frequently asked questions
PEX tubing is not recommended for use with fuel oil lines. While PEX tubing is used to transport oil, natural gas, hazardous chemicals, and sewage or slurry for waste treatment, it is not suitable for all fuel types and applications. It is best to consult a professional plumber to determine the most suitable material for your specific needs.
PEX tubing has some disadvantages when used for a fuel oil line. It is made of a soft material that can be damaged by nails, rodents, and other sharp objects. It is also not resistant to UV light, so it cannot be exposed to direct sunlight for extended periods.
Yes, copper piping is a common alternative to PEX tubing for fuel oil lines. Copper pipe and solder fittings can provide a more durable and suitable solution for fuel oil transportation. However, it is important to follow the proper joining methods and use the correct filler metals to ensure safe and effective installation.
Installing a PEX gas line, especially for outdoor and underground applications, is a complex task that is best left to professionals. While PEX tubing can be used for gas lines in some cases, it is important to consult with a qualified plumber or gas company to determine the most suitable material and installation method for your specific requirements.
