Copper Type K tubing is a popular choice for plumbing, HVAC, and refrigeration applications due to its durability and thick walls. This list covers the standard sizes of Type K copper tubing, explaining their dimensions and common uses. Whether you’re a plumber, contractor, or DIY enthusiast, understanding these sizes helps you select the right pipe for your project.
1/4 Inch Type K Copper Tubing
The 1/4 inch size refers to the nominal inside diameter of the pipe, but the actual outside diameter is 3/8 inch (0.375 inches). This size is commonly used for small refrigeration lines and fuel oil lines where low flow rates are required. Its thick walls provide excellent pressure resistance and corrosion protection in tight spaces.
3/8 Inch Type K Copper Tubing
This size has an outside diameter of 1/2 inch (0.5 inches) and is frequently used for residential water supply lines and small HVAC systems. The Type K wall thickness for 3/8 inch tubing is 0.035 inches, making it one of the thickest copper tubes in this diameter range. It balances flexibility with strength, ideal for moderate pressure applications.
1/2 Inch Type K Copper Tubing
With an outside diameter of 5/8 inch (0.625 inches), 1/2 inch Type K copper tubing is a standard size for potable water lines and irrigation systems. Its wall thickness is approximately 0.049 inches, providing superior durability over Type L and M copper tubes of the same size. This thickness helps prevent leaks and withstands higher pressures common in municipal water systems.
5/8 Inch Type K Copper Tubing
The 5/8 inch tubing has an outside diameter of 3/4 inch (0.75 inches) and is often used in commercial water distribution and HVAC refrigerant lines. Its thick walls (around 0.057 inches) ensure excellent resistance to mechanical damage and corrosion, making it suitable for exposed or underground installations.
3/4 Inch Type K Copper Tubing
This size has an outside diameter of 7/8 inch (0.875 inches) with a wall thickness of about 0.065 inches. It is widely used in larger water service lines and hydronic heating systems where higher flow rates and pressures are required. The robust wall thickness provides longevity in harsh conditions, such as outdoor or industrial environments.
7/8 Inch Type K Copper Tubing
With an outside diameter of 1 inch (1.0 inch), 7/8 inch Type K tubing is less common but used in specialized plumbing and HVAC applications requiring strong, thick-walled tubing. Its wall thickness is roughly 0.071 inches, offering enhanced durability and pressure resistance compared to smaller sizes. It’s ideal for systems with elevated pressure or mechanical stress.
1 Inch Type K Copper Tubing
The 1 inch size has an outside diameter of 1 1/8 inches (1.125 inches) and a wall thickness near 0.072 inches. It is commonly employed in commercial plumbing for main water lines and large HVAC systems. This size provides a good balance between flow capacity and structural integrity, making it suitable for high-demand installations.
1 1/8 Inch Type K Copper Tubing
With an outside diameter of 1 1/4 inches (1.25 inches), this size is used for larger commercial and industrial systems. Its wall thickness ranges around 0.083 inches, providing substantial durability and resistance to pressure and corrosion. It is often found in fire suppression systems and large-scale water distribution.
1 1/4 Inch Type K Copper Tubing
This tubing has an outside diameter of 1 3/8 inches (1.375 inches) and is favored in heavy-duty plumbing and HVAC applications. The thick walls (approximately 0.095 inches) make it highly resistant to physical damage and corrosion, suitable for underground or exposed installations where longevity is critical.
1 1/2 Inch Type K Copper Tubing
The largest standard residential and commercial size, 1 1/2 inch tubing has an outside diameter of 1 5/8 inches (1.625 inches) and a wall thickness near 0.109 inches. It is commonly used for main water service lines, large hydronic heating loops, and commercial refrigeration. Its thick walls ensure that it can handle high pressures and provide long-lasting service in demanding environments.
How to Choose
When selecting Type K copper tubing, the most critical factors are the pipe’s outside diameter, wall thickness, and pressure rating. Type K copper has the thickest walls among standard copper types (L and M), making it suitable for high-pressure or underground applications. You should consider the intended use, flow requirements, and local plumbing codes. For potable water, irrigation, or HVAC systems, consult the pressure ratings and ensure compatibility with fittings and connectors. Also, note that the nominal size refers to the inside diameter, but fittings and connections are made based on the outside diameter, so accurate measurement is essential.
Frequently Asked Questions
What is the difference between Type K, L, and M copper tubing?
Type K has the thickest walls and highest pressure rating, Type L is medium thickness for general plumbing, and Type M has the thinnest walls, suitable for low-pressure applications.
Can I use Type K copper tubing for potable water?
Yes, Type K copper tubing is approved for potable water and is often preferred for underground water service lines due to its durability.
How do I measure copper tubing size?
Measure the outside diameter (OD) of the pipe to determine the size. Nominal sizes refer to the approximate inside diameter (ID), which can be misleading for fittings.
Is Type K copper tubing more expensive than other types?
Yes, due to its thicker walls and enhanced durability, Type K copper tubing generally costs more than Types L and M.
Can Type K tubing be bent on-site?
Yes, Type K copper tubing is flexible enough to be bent with proper tools, but its thicker walls make it less flexible than Type M or L tubing.
What pressure can Type K copper tubing handle?
Pressure ratings vary by size and temperature, but Type K typically supports pressures up to 1000 psi at room temperature, making it suitable for high-pressure applications.
Final Thoughts
Understanding the Type K copper tubing size chart is essential for choosing the right pipe for your plumbing, HVAC, or refrigeration project. Its thicker walls and higher pressure ratings make it ideal for demanding applications, especially underground or exposed lines. Always verify local codes and pressure requirements before selecting your tubing size, and remember that accurate measurements and compatible fittings are crucial for a reliable installation.
Related
- Pickled Yellow Squash Recipes: Easy Tangy Preserves to Try
- Pickling Squash from Garden: 10 Varieties and Tips That Work
- Plant With No Roots: 10 Unique Rootless Plants Explained