Diy plumber’s guide: how to measure pex pipe size like a pro

Understanding the size of your PEX (cross-linked polyethylene) pipes is crucial for plumbing projects and repairs. However, deciphering these pipe sizes can be a puzzling task, leaving you scratching your head. This comprehensive guide will empower you with the knowledge to accurately determine PEX pipe size, ensuring seamless plumbing endeavors.

Identifying PEX Pipe Sizes: A Comprehensive Approach

1. Measure the Outside Diameter (OD)

The most straightforward method to determine PEX pipe size is to measure its outside diameter (OD). Using a ruler or caliper, measure the pipe’s outer circumference and divide by 3.14 (pi) to obtain the OD. Common PEX pipe sizes include 1/2″, 3/4″, 1″, and 1 1/2″.

2. Examine the Pipe Markings

Many PEX pipes have markings printed on their surface, providing valuable information including the pipe size. These markings typically indicate the OD in inches, making it easy to identify the pipe size.

3. Consult the Pipe Chart

If you’re unable to locate any markings on the pipe, refer to a PEX pipe chart. These charts list the ODs of various PEX pipe sizes, allowing you to compare your measurements and determine the exact size.

4. Use a PEX Gauge

A PEX gauge is a specialized tool designed to measure the thickness of PEX pipes. By measuring the pipe’s thickness, you can determine its size using a conversion chart. PEX gauges are available at most hardware stores.

5. Measure the Inner Diameter (ID)

While not as common as OD measurements, you can also measure the pipe’s inner diameter (ID). To do this, use a caliper to measure the inside diameter of the pipe. Subtract the pipe’s wall thickness from the ID to obtain the OD.

Additional Considerations

1. Allow for Expansion

When measuring PEX pipe size, keep in mind that the pipe will expand slightly when heated. Therefore, it’s recommended to measure the pipe at room temperature and add 1/8″ to 1/4″ to the OD measurement to account for expansion.

2. Check for Wall Thickness

PEX pipes come in different wall thicknesses, which can affect the pipe’s durability and pressure rating. The standard wall thickness for PEX pipes used in residential applications is 1/2″.

Recommendations: Deciphering the PEX Pipe Size Code

With these techniques at your disposal, you can confidently determine the size of PEX pipes, ensuring accurate plumbing installations and repairs. Remember to consider additional factors such as expansion and wall thickness to ensure optimal performance.

Answers to Your Questions

1. How do I know if my PEX pipe is damaged?

Look for cracks, bulges, or leaks in the pipe. If you notice any damage, replace the pipe immediately.

2. Can I use PEX pipes for hot water?

Yes, PEX pipes are suitable for both hot and cold water applications. However, ensure that you use PEX pipes designed for hot water systems.

3. How long do PEX pipes last?

PEX pipes have a lifespan of around 50 years, making them a durable choice for plumbing systems.

4. Is PEX pipe easy to install?

Yes, PEX pipes are lightweight and flexible, making them easy to install even in tight spaces.

5. What tools do I need to cut PEX pipes?

You can use a PEX cutter or a sharp utility knife to cut PEX pipes.