Which fitting is commonly used to connect gas pipes?

The use of a threaded fitting or a coupling is common in connecting gas pipes due to their ability to create a strong, leak-resistant joint. Threaded fittings are designed to allow for easy assembly and disassembly, making maintenance and repairs more convenient. They provide a secure connection that can withstand the pressures typically found in gas piping systems.

Threaded connections are widely accepted in the gas industry and comply with relevant standards and codes, ensuring safety in gas distribution. They are versatile and can be used with various types of pipes and materials, including black iron and galvanized steel.

Other connection methods, such as soldering and welding, are generally not suitable for gas piping due to potential weaknesses in the joint or difficulties in achieving the necessary safety standards. Compression fittings, while useful in some applications, are less common for permanent gas connections due to concerns about their reliability over time. Therefore, the threaded fitting or coupling is preferred in gas piping systems for both safety and practicality.