What should be done with joints in a gas piping system to ensure safety?

In a gas piping system, ensuring safety and preventing leaks is critical. The proper method for joining pipes includes either welding or threading. Welding involves fusing the metal at the joints, creating a robust and permanent bond that is highly resistant to leaks. This is particularly important in high-pressure systems or where there is a risk of rust and corrosion.

Threaded joints, on the other hand, allow for disassembly when necessary but must be made with care, ensuring that appropriate sealing compounds or tape (such as Teflon tape) are used to prevent leaks. Both methods provide a strong mechanical connection that can withstand the internal pressures of a gas system and the test pressures applied during system checks.

The other options mentioned do not provide the same level of safety or effectiveness in ensuring gas-tight seals. Painting joints might help in preventing corrosion but does not address the integrity of the joint itself. Bolting may not provide a suitable seal for gas piping due to potential gaps that can cause leaks. Soldering, while effective for joining some types of pipes, is not an appropriate method for steel or iron gas pipes, typically used in natural gas transmission, due to its lower strength and durability under pressure.

Therefore, the approach of welding or threading aligns with industry standards