Removing Water From Pipe – How to Get Rid of Toilet Water Hammering Part 2
Why Dry Pipes are Crucial for Successful Copper Soldering
Soldering copper pipes is a fundamental plumbing skill, whether you're fixing a leak, extending a line, or adding a new fixture. It involves joining copper pipes and fittings using a molten filler metal (solder) and a heat source (typically a propane torch). While seemingly straightforward, achieving a strong, leak-free soldered joint hinges on one crucial factor: dry pipes.
Here's why removing all water and moisture from your copper pipes is essential before soldering:
1. Steam Interferes with Heat Transfer: When you apply heat to a copper pipe containing water, the water turns to steam. This steam acts as an insulator, preventing the pipe from reaching the necessary temperature for the solder to melt and flow properly. The result? A weak, poorly formed joint that's prone to leaks.
2. Solder Won't Adhere to Wet Surfaces: Just like trying to glue two wet pieces of paper together, solder won't bond effectively to a wet copper surface. Moisture disrupts the molecular interaction between the solder and the copper, leading to a weak and unreliable connection.
3. Steam Can Cause Porosity and Weakness: Trapped steam within the joint can create bubbles in the molten solder. These bubbles weaken the joint, making it susceptible to cracking and leaking over time.
4. Risk of Scalding and Injury: Heating a water-filled pipe can cause the water to expand rapidly and potentially burst out, causing burns and injuries.
How to Ensure Dry Pipes
Turn off the water supply: Locate the main water shut-off valve or a valve specific to the pipe you're working on and turn it off completely.
Drain the pipe: Open the lowest fixture on the line to drain any remaining water. If possible, use compressed air to blow out any residual water.
Use a heat gun or torch: Gently heat the pipe to evaporate any remaining moisture. Be careful not to overheat the pipe, as this can damage it.
Use a shop vac or compressed air to remove moisture.
Use bread or a sponge: For small sections, a piece of bread or a dry sponge can be used to absorb any remaining moisture inside the pipe.
By taking the time to properly dry your copper pipes before soldering, you'll ensure a strong, leak-free connection that will last for years to come.
