Soft-soldering a copper pipe inside and outside with copper paste involves applying the paste to the areas where the pipe will be joined. The paste helps to clean the surface of the copper and promotes better adhesion of the solder. Once the paste is applied, the copper pipe is fitted into place and heated with a soldering iron. The solder is then applied to the joint, melting and flowing into the gap between the pipes, creating a strong and secure bond. **

To extend a water pipe with a 12mm copper pipe to 15mm, you can use a reducing coupling or a reducing fitting. This fitting will allow you to connect the 12mm copper pipe to the 15mm pipe and create a seamless extension. Make sure to properly measure and cut the copper pipe to the desired length before connecting it with the reducing fitting. Additionally, it's important to use the appropriate tools and materials to ensure a secure and leak-free connection. **

To solder a leaking copper heating pipe, you will first need to turn off the water supply to the pipe and drain any remaining water. Then, use a pipe cutter to remove the section of the pipe that is leaking. Clean the ends of the remaining pipe with sandpaper and apply flux to the cleaned areas. Next, fit a new piece of copper pipe into the gap and use a propane torch to heat the joint. Once the joint is hot enough, apply solder around the joint, allowing it to flow into the joint and create a watertight seal. Finally, allow the joint to cool and then turn the water supply back on to test for leaks. **

To determine if the screw connections on the copper pipe are leaking, you can perform a visual inspection for any signs of water dripping or pooling around the connections. Additionally, you can use a dry paper towel to gently dab around the connections to check for any moisture. If there is evidence of water leakage, it may indicate that the screw connections are not properly sealed and may need to be tightened or resealed with plumbing tape or sealant. It's important to address any leaks promptly to prevent water damage and ensure the proper functioning of the plumbing system. **

No, it is not recommended to solder an aluminum composite pipe together with a copper pipe to transport drinking water. These two materials have different properties and can react with each other, potentially causing corrosion and contamination of the water supply. It is best to use compatible materials for plumbing systems to ensure the safety and quality of the drinking water. **

To attach a wooden rod in a copper pipe, you can use a pipe hanger or a pipe strap specifically designed for this purpose. Secure the wooden rod to the copper pipe using screws or nails. Make sure the attachment is tight and secure to prevent the wooden rod from slipping or falling out. Additionally, you can use adhesive or epoxy to further secure the wooden rod in place within the copper pipe. **

To lay a copper pipe without insulation under plaster, you will first need to secure the pipe in place using pipe clips or straps to prevent it from moving. Make sure the pipe is properly supported along its length to avoid any sagging. Once the pipe is secured, you can then proceed to plaster over it, ensuring that the plaster is applied evenly and smoothly. It is important to take care not to damage the pipe while plastering and to allow the plaster to fully dry before any further work is done around the pipe. **

The power cable can be installed in a copper pipe by using a process called "conduit wiring." This involves running the cable through a length of copper pipe that has been specifically designed for electrical wiring. The pipe is then secured to the wall or ceiling using appropriate fixtures. It is important to ensure that the pipe is properly grounded and that the cable is protected from damage or interference. Additionally, it is crucial to follow local building codes and regulations when installing electrical wiring in any type of conduit. **