What is PEX Pipe?
PEX, or cross-linked polyethylene, is a type of plastic piping widely used in plumbing. It’s popular because of its flexibility, resistance to scale and chlorine, lower shipping costs, and reduced noise compared to traditional piping materials. But not all PEX Pipe ASTM F2788 is created equal.
The Differences Between PEX A and PEX B
Manufacturing Process
ASTM F2788 PEX A is made using a method called the Engel method, which cross-links the polyethylene molecules using peroxide. This results in a more flexible and durable product.
ASTM F2788 PEX B, on the other hand, uses a different process called the Silane method, which involves a moisture-cure process. This makes PEX B slightly less flexible but more resistant to UV light and chlorine.
Flexibility and Durability
In terms of flexibility, ASTM F2788 PEX A has the edge. It can bend easily without kinking, making it ideal for tight spaces. ASTM F2788 PEX B is stiffer and can be more challenging to work with in cramped areas.
Temperature and Pressure Ratings
Both types of PEX can handle high temperatures and pressures, but PEX A tends to have slightly better performance in extreme conditions, thanks to its manufacturing process.
How to Identify PEX A and PEX B
Identifying your piping type may seem daunting, but there are some straightforward ways to do it.
Color and Markings
Both PEX A and PEX B pipes are available in various colors, including red, blue, and white. However, you’ll often find that PEX A pipes have more detailed markings printed on them, indicating their specifications, which can help you distinguish them.
Bend Radius
You can also test the bend radius. If you have a section of pipe that bends easily with minimal effort, it’s likely PEX A. PEX B will require more force to bend and may not maintain as tight a radius.
Sound and Feel
When you tap on the pipes, ASTM F2788 PEX A typically produces a softer sound, while PEX B sounds more solid and hollow. This isn’t a foolproof method but can help you make an educated guess.
Applications of PEX A and PEX B
PEX A Applications
Due to its flexibility, ASTM F2788 PEX A is often use in:
- Residential plumbing for water supply lines
- Radiant floor heating systems
- Repipe projects where flexibility is crucial
PEX B Applications
PEX B is generally use in:
- Potable water systems
- Hydronic heating systems
- Applications requiring more resistance to UV exposure
Advantages of Using PEX
PEX offers several advantages:
- Flexibility: Easy to install in tight spaces.
- Corrosion resistance: Less likely to rust or corrode over time.
- Fewer fittings: This can reduce potential leaks and installation time.
- Cost-effective: Generally less expensive than copper or PVC piping.
Common Questions About PEX Pipes
As you explore PEX pipes, you might have a few questions:
- Is PEX safe for drinking water?
- Yes, PEX is approve for drinking water use in many areas.
- Can PEX be used outdoors?
- PEX B is better suited for outdoor use due to its UV resistance.
- Does PEX require insulation?
- It’s recommend in colder climates to prevent freezing.
- Can PEX be recycled?
- Yes, PEX can be recycled, but it’s best to check local recycling options.
- What’s the lifespan of PEX piping?
- PEX has a lifespan of about 25-50 years, depending on conditions and installation.
Conclusion
Understanding whether you have ASTM F2788 PEX A Pipe or PEX B Pipe can save you time and money in plumbing repairs and installations. By recognizing the differences and applications of each type, you can make more informed decisions about your plumbing system. Whether you’re a DIY enthusiast or a homeowner looking to upgrade, knowing your piping will help you achieve better results.
FAQs
- Can PEX A and PEX B be used together?
- Yes, but you need compatible fittings to avoid leaks.
- What are the typical colors of PEX pipes?
- PEX pipes typically come in red, blue, and white.
- How do I prevent PEX pipes from freezing?
- Insulate them, especially in unheated areas like basements.
- Are there any downsides to using PEX?
- Some concerns include UV exposure for PEX A and potential chemical leaching in certain conditions.
- How do I know the size of my PEX pipes?
- Check for printed markings on the pipe that indicate the size.
