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Description:
Copper Tubes and Copper Coils are made in accordance to JIS H3300 C1220T, ASTM B88 Standards. B88 Standards tubes are also called Type K copper pipes and Type L Copper pipes. JIS H3300 C1220T Copper tubes are suitable for water works and ASTM B88 copper tubes are suitable for air conditioning and refrigeration field service. Types K and L tubes are designated by ASTM nominal sizes, with the actual outside diameter (OD) 1/8 inch larger than the nominal size designation. The difference between Type K and Type L tubes are different wall thicknesses. Type K tubes has thicker walls than Type L tubes for any given diameter. |
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Product Information of Copper Tubes
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1. Specifications:
Copper tubes are manufactured based on the requirements of specifications under ASTM B88 or JIS H3300. ASTM B88 is a standard specification for seamless copper tube that is suitable for general plumbing, similar applications for the conveyance of fluids, and commonly used with solder, flared, or compression-type fittings. For JIS H3300, it is a standard that specifies expanded copper and copper alloy seamless pipes and tubes, having a round section. |
Copper Tubes
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2. Copper Tube Attributes:
Under ASTM B88, the minimum tensile strength for copper tube is 250 N/mm², while for copper tube under JIS H3300, the minimum tensile strength is 315 N/mm². For Chuan Kok’s copper tubes, those that are under these two standard contains a minimum 99.90% of pure copper (CU) and phosphorus (P) in a range of 0.15% to 0.40%. As there are few grades under ASTM B88 and JIS H3300, the copper tubes that Chuan Kok carries are ASTM B88 C12200 and JIS H3300 C1220T. Specified above mentioned standards are phosphorus deoxidized copper tubes. Copper tubes are deoxidized with phosphorus to clear out porosity and decrease the cuprous oxide. Deoxidization is the removal of oxygen content during the manufacturing process. It is important as oxygen is unfavorable to the quality of produced tubes. These phosphorus deoxidized copper tubes are good in flaring, welding and bending, strong corrosion resistance with good heat conductivity. The following table shows the chemical composition of copper tubes. |
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Stamping on Copper Pipe
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3. Types of Copper Tube:
Under ASTM B88, there are a few types of copper tubes that are usually consumed: Type K, Type L, and Type M. For copper tubes under ASTM B88, the outer diameter is always 1/8" larger than the designated sizes. Different types of copper tube also represent a series of sizes with different wall thickness. For any outer diameter, wall thickness of Type K tube is thicker than Type L tube, and wall thickness of Type L are thicker than Type M. Another factor that determines the types of copper tube is temper, which is used to describe the degree of strength and hardness of copper tubes. In the market, drawn temper copper tubes are always referred to as “hard” tubes and annealed as “soft” tubes. Hard temper tubes are often joined by brazing, usually using capillary fittings or by welding. While soft temper tubes can be joined by using flare type fittings and compression fittings. For JIS H3300, copper tubes are available in two types: Inches & Metric. Outer diameter of copper tubes under this standard, are measured by Inches OD or Metric OD. Copper tubes under JIS H3300 are suitable as heat exchanger, in chemical industry, and water supply applications. Copper tubes are also available in coil form under JIS H3300, known as copper coil. |
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4. Outer Diameter and Tube Thickness Specifications:
Dimensions of copper tubes are according to ASTM B88 standard specifications and shown in the product literature pdf file below.
The table below illustrates the OD tolerance under standard JIS H3300. |
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5. Size Measurement and Copper Tube:
The outer diameter (OD) of copper pipes can be measured in inches (“), nominal Bore (NB), and metric sizes. The nominal bore and outer diameter sizes are aligned one to the other. The outer diameter value is often 1/8 inch larger than the nominal size. A 2" nominal bore copper pipe, for instance, has a 2 1/8" outer diameter. It is commonly used on these three pipe types. The diameter varies from 6 mm to 54 mm, with nominal bore sizes ranging from 1/8” to 4”.
The outer diameter (OD) of copper pipes can be measured in inches (“), nominal Bore (NB), and metric sizes. The nominal bore and outer diameter sizes are aligned one to the other. The outer diameter value is often 1/8 inch larger than the nominal size. A 2" nominal bore copper pipe, for instance, has a 2 1/8" outer diameter. It is commonly used on these three pipe types. The diameter varies from 6 mm to 54 mm, with nominal bore sizes ranging from 1/8” to 4”.
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6. Wall Thickness of Type K, L, M Copper Tubes:
Under ASTM B88, Type K, L and M of copper tubes have different wall thickness. Type K pipes have thicker walls than Type L pipes, while Type L pipes have thicker walls than Type M pipes. As a result, the wall thickness of copper pipes affects the working pressure and application for each type of pipe.
Under ASTM B88, Type K, L and M of copper tubes have different wall thickness. Type K pipes have thicker walls than Type L pipes, while Type L pipes have thicker walls than Type M pipes. As a result, the wall thickness of copper pipes affects the working pressure and application for each type of pipe.
Nominal Bore (NB) |
Outer Diameter (Inch OD) |
Outer Diameter (mm OD) |
Wall Thickness Type K |
Wall Thickness Type L |
Wall Thickness Type M |
1/8" |
1/4" |
6.35 |
0.035" |
0.030" |
- |
1/4" |
3/8" |
9.53 |
0.035" |
0.030" |
- |
3/8" |
1/2" |
12.70 |
0.049" |
0.035" |
0.025" |
1/2" |
5/8" |
15.88 |
0.049" |
0.040" |
0.028" |
5/8" |
3/4" |
19.05 |
0.049" |
0.042" |
0.028" |
3/4" |
7/8" |
22.23 |
0.065" |
0.045" |
0.032" |
7/8" |
1" |
25.40 |
0.065" |
0.050" |
0.035" |
1" |
1 1/8" |
28.58 |
0.065" |
0.050" |
0.035" |
1 1/4" |
1 3/8" |
34.93 |
0.065" |
0.055" |
0.042" |
1 1/2" |
1 5/8" |
41.28 |
0.072" |
0.060" |
0.049" |
2 1/2" |
2 5/8" |
66.68 |
0.095" |
0.080" |
0.065" |
3" |
3 1/8" |
79.38 |
0.109" |
0.090" |
0.072" |
3 1/2" |
3 5/8" |
92.08 |
0.120" |
0.100" |
0.083" |
4" |
4 1/8" |
104.78 |
0.134" |
0.110" |
0.095" |
5" |
5 1/8" |
130.18 |
0.160" |
0.125" |
0.109" |
6" |
6 1/8" |
155.58 |
0.192" |
0.140" |
0.122" |
7. Applications:
Water supply lines and refrigerant lines in heating, ventilation, and air-conditioning (HVAC) systems are two of the most common applications for copper pipe in today's construction industry. While this can refer to air conditioning, many people are unaware that this copper tubing system is what keeps our refrigerators and freezers running. The table below shows the different system applications of Type K, L and M.
Water supply lines and refrigerant lines in heating, ventilation, and air-conditioning (HVAC) systems are two of the most common applications for copper pipe in today's construction industry. While this can refer to air conditioning, many people are unaware that this copper tubing system is what keeps our refrigerators and freezers running. The table below shows the different system applications of Type K, L and M.
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For more information regarding copper tubes, please refer to en.wikipedia.org/wiki/Copper_tubing.
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FAQ Of Copper Tubes
What are the differences between JIS H3300 C1220T tubes, and the ASTM B88 pipes?
JIS H3300 C1220T – The standard specifies round-sectioned extended copper and copper alloy seamless pipes and tubes.
ASTM B88 – Standard specifications for seamless copper pipes used in general plumbing, similar applications for the
conveyance of fluids, and typically used with solder, flared, or compression-type fittings.
ASTM B88 – Standard specifications for seamless copper pipes used in general plumbing, similar applications for the
conveyance of fluids, and typically used with solder, flared, or compression-type fittings.
What are the main strengths of copper pipes?
Cooper pipes are light, strong and corrosion resistant which used worldwide in piping.
What are the diameter sizes available?
The available diameter sizes range from 6 mm to 54 mm, with nominal bore sizes ranging from 1/8 inch to 4 inches.
What is the wall thickness for three types of copper pipe (Type K, L, M)?
Compared to Type L, Type K pipes have thicker walls. Meanwhile, Type L walls thickness is thicker than Type M.
What are the differences between copper pipe type K, L and M?
Different working pressure and applications for different types of pipes:
Type K: Water Distribution, Fire Protection, Oil & LPG Gas etc.
Type L: Interior Plumbing, Waterline repairing, Fire Protection etc.
Type M: Flexible Form, Domestic Water Service, Vacuum Systems etc.
Type K: Water Distribution, Fire Protection, Oil & LPG Gas etc.
Type L: Interior Plumbing, Waterline repairing, Fire Protection etc.
Type M: Flexible Form, Domestic Water Service, Vacuum Systems etc.
Can copper pipes be bent during installation?
Yes, indeed. During the installation process, rapid bends or length changes are possible. Additionally, testing report has shown that a bent
copper pipe bursting strength is greater than the pipe before bending.
copper pipe bursting strength is greater than the pipe before bending.
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