Exposed: why galvanized pipes are a gas leak hazard
What To Know
- When galvanized pipe is exposed to high temperatures, such as those found in gas lines, the zinc coating can react with the steel and cause a condition known as zinc embrittlement.
- If you are planning to install a gas line, it is important to use the correct type of pipe.
- Galvanized pipe is not allowed for gas lines because it can become brittle and crack due to zinc embrittlement and hydrogen embrittlement.
Galvanized pipe is a type of steel pipe that has been coated with zinc to protect it from corrosion. It is commonly used for plumbing and other applications where corrosion resistance is important. However, galvanized pipe should never be used for gas lines. Here’s why:
1. Zinc Embrittlement
When galvanized pipe is exposed to high temperatures, such as those found in gas lines, the zinc coating can react with the steel and cause a condition known as zinc embrittlement. This makes the pipe brittle and susceptible to cracking, which can lead to gas leaks and explosions.
2. Hydrogen Embrittlement
In addition to zinc embrittlement, galvanized pipe can also be susceptible to hydrogen embrittlement. This occurs when hydrogen gas diffuses into the steel and causes it to become brittle. Hydrogen embrittlement can also lead to cracking and gas leaks.
3. Corrosion
Galvanized pipe is protected from corrosion by the zinc coating. However, over time, the zinc coating can wear away, exposing the underlying steel to corrosion. This can lead to leaks and other problems.
4. Safety Codes
In most areas, building codes prohibit the use of galvanized pipe for gas lines. This is due to the safety risks associated with zinc embrittlement and hydrogen embrittlement.
5. Cost
Galvanized pipe is more expensive than other types of pipe that are suitable for gas lines.
6. Appearance
Galvanized pipe has a dull, gray appearance that may not be aesthetically pleasing.
7. Other Options
There are several other types of pipe that are suitable for gas lines, including:
- Black iron pipe
- Copper pipe
- Stainless steel pipe
- Polyethylene pipe
These types of pipe are all resistant to corrosion and zinc embrittlement, and they are all approved for use in gas lines by building codes.
Alternatives to Galvanized Pipe for Gas Lines
If you are planning to install a gas line, it is important to use the correct type of pipe. Galvanized pipe should never be used for this purpose. Instead, use one of the following types of pipe:
- Black iron pipe: This is the most common type of pipe used for gas lines. It is strong, durable, and resistant to corrosion.
- Copper pipe: Copper pipe is another good option for gas lines. It is more expensive than black iron pipe, but it is also more resistant to corrosion.
- Stainless steel pipe: Stainless steel pipe is the most expensive option, but it is also the most resistant to corrosion.
- Polyethylene pipe: Polyethylene pipe is a type of plastic pipe that is often used for gas lines. It is lightweight, flexible, and resistant to corrosion.
What You Need to Learn
1. Why is galvanized pipe not allowed for gas lines?
Galvanized pipe is not allowed for gas lines because it can become brittle and crack due to zinc embrittlement and hydrogen embrittlement.
2. What are the signs of zinc embrittlement?
The signs of zinc embrittlement include cracks, leaks, and a dull, gray appearance.
3. What are the signs of hydrogen embrittlement?
The signs of hydrogen embrittlement include cracks, leaks, and a brittle texture.
4. What types of pipe can be used for gas lines?
The types of pipe that can be used for gas lines include black iron pipe, copper pipe, stainless steel pipe, and polyethylene pipe.
5. Which type of pipe is the best for gas lines?
The best type of pipe for gas lines is black iron pipe. It is strong, durable, and resistant to corrosion.
