Characteristics of Copper Pipe
1. High Thermal Conductivity
The high thermal conductivity of copper pipe allows rapid heat transfer, which is why it is widely used in air-conditioning, refrigeration and heat-exchange systems.
2. Corrosion Resistance
Copper tube has good corrosion resistance to a variety of media, does not easily rust, and has a long service life in water and HVAC service.
3. High Plasticity
Copper can be processed into various shapes by bending and stretching, meeting different installation requirements and allowing long runs without fittings.
4. Hygienic and Environmentally Friendly
Copper pipe is non-toxic and odourless, does not pollute the water, and is recognized for drinking-water service.
Copper Tube Types and Standards
- Plumbing tube to ASTM B88: supplied in wall-thickness types K (heaviest), L (standard) and M (lightest); select the type by working pressure and application.
- Air-conditioning and refrigeration (ACR) tube to ASTM B280: drawn or annealed copper tube for field service, normally C12200 (DHP) copper.
- European systems commonly reference EN 1057 for copper and copper-alloy tubes for water and gas service.
- Industrial and general-purpose tube can be supplied to the applicable national standard for the market.
Types of Fitting Joints
1. Welded / Soldered (Capillary) Joints
Copper pipes are joined with solder or brazing filler in a capillary joint. The connection is strong and well sealed, but requires professional equipment, technique and clean surfaces.
2. Press Fittings
The fitting is pressed onto the tube with a pressing tool, making installation fast and simple without welding or open flame. Press systems are widely used in plumbing and heating.
3. Compression Fittings
A threaded nut and ferrule compress onto the tube; assembly and disassembly are easy, making compression fittings suitable for serviceable connections.
4. Flare Joints
One end of the copper pipe is flared and then connected with a flare nut and fitting. Operation is easy, but the connection strength is relatively low and the flare must be made correctly.
5. Threaded Fittings
Threaded connections are suitable for some small piping systems and for transitions to threaded equipment.
Selection Considerations
- Material: choose copper tubes and fittings that meet the applicable standard (for example ASTM B88, B280 or EN 1057) to ensure performance and quality.
- Specifications: select the correct tube size and fitting type for the actual need, and ensure the connection dimensions match.
- Certification: for potable-water service, select products certified for drinking-water contact (for example NSF/ANSI 61 or WRAS) and verify the certificate.
- Installation: have professionals install the system and pressure-test the joints to ensure installation quality and sealing.
FAQ
What is the difference between Type K, L and M copper tube?
They differ in wall thickness: K is the heaviest (thickest wall), L is the standard wall, and M is the lightest. Thicker walls allow higher working pressure; choose per the design pressure and code.
Which is better - soldered or press fittings?
Soldered capillary joints are traditional and low-cost but require open-flame work; press fittings are faster, flame-free and easier to install in tight spaces, with a slightly higher fitting cost.
Can copper pipe be used for hot water?
Yes. Copper is widely used for both cold and hot water supply and heating systems, with excellent resistance to hot-water corrosion and long service life.
Is copper pipe safe for drinking water?
Yes, when supplied and installed correctly. Copper is a traditional drinking-water material; use certified products (for example NSF/ANSI 61 or WRAS) and follow the applicable plumbing code.
