Copper Tubing Types, Dimensions & Measurement – Standard Copper Pipe Size Chart (OD, ID & Thickness)

If you are working on a significant plumbing project, it is crucial to choose the right copper tubing type and dimension. This article will guide you through the types and standard sizes of copper pipes with charts (mm/inches), as well as the measurement methods.

Common Types of Copper Tubing/Pipes and Color Codes

Copper tubing for plumbing can be classified into different categories by their thickness in the U.S., Canada, and India, there are four regular types of copper pipes indicated by different letters, including Type K, Type L, Type M, and DWV (Drain-Waste-Vent), each type has a unique color code.
– Type K Copper Pipe (Green): distinguished by its thickest walls compared to other types, available in both rigid and flexible forms, it is the most robust among common copper tube types, which makes it ideal for underground uses. Its applications span various industries, including water distribution, fire protection, oil transportation, and HVAC systems. However, Type K is typically the most expensive option in the copper piping range, so it is less commonly used for interior residential water supply pipes. Instead, it is frequently employed in commercial buildings, city water mains, and industrial settings where their strength and longevity are paramount.
– Type L Copper Pipe (Blue): its wall thickness falls between the heavier Type K and the thinner Type M pipes, also available in flexible and rigid forms, Type L copper tube is particularly suitable for repairing or replacing old branch water lines and professional plumbers in various applications, including interior plumbing, fire protection systems, and HVAC installations.
– Type M Copper Pipe (Red): this one is only available in rigid option, it is thinner than both Type K and Type L, also cheaper than Type L because of the relatively lower production costs and lighter weight. Type M is suited for branch plumbing lines rather than water supply, as it is less durable under heavy water pressure.
– DMW Copper Pipe (Yellow): the thinnest type among these four, typically used for above-ground purposes, also applicable for plumbing drains and vents.

Copper Tube Standards
– Type K, L & M: ASTM B 88
– DWV: ASTM B 306
– ACR: ASTM B 280

How to Measure Copper Pipe Size?

Copper pipes are commonly used in plumbing, especially in older homes or when remodeling, to ensure proper fit and function, accurate measurement is essential. Below are straightforward and useful methods when you need to determine the dimensions of a copper tube.
Measuring the Length of Copper Pipes
1. Place one end of the measuring tape at one end of the copper pipe.
2. Extend the measuring tape along the length of the pipe to the other end.
3. Read the measurement on the tape where it aligns with the end of the pipe.
4. Record the length, being as precise as needed for your project.

Measuring the Opening Diameter of Copper Pipes
1. Look for any markings on the pipe that indicate its size. Some pipes have this information printed on them (e.g., “1/2 inch”).
2. If there are no markings, you’ll need to measure the opening.
3. Position your ruler across the open end of the pipe.
4. Measure from the inner edge on one side to the inner edge directly across.
5. Read the measurement on the ruler.

Note:
– Always measure the inner diameter, not the outer diameter of the pipe.
– Measure straight across, not at an angle.
– For more accurate measurements, use a caliper if available.
– If you’re unsure, it’s always best to consult with a professional plumber or bring a sample of the pipe to a hardware store for confirmation.

Thickness of Copper Pipes
The thickness of pipes varies depending on their diameter. For instance, a 3/4-inch Type K tube has a wall thickness of 0.065 inches, while a 1/2-inch pipe measures 0.049 inches thick.

Common Copper Pipe Sizes
The commonly used copper pipe sizes for residential water are 1/2 inch, 3/4 inch, and 1 inch, while larger sizes often exist for commercial or specialized applications.

Standard Copper Pipe Size Chart in MM and Inches (OD, ID, Thickness)

ASTM standard sizes designate Type K, L, M, and DWV tubes, here are sizes charts for different types of copper tubes in both mm and inches, covering outside diameter, inside diameter, and thickness.
1 – Type K Copper Pipe Dimensions

2 – Type L Copper Pipe Dimensions

3 – Type M Copper Pipe Dimensions

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