What should be the minimum test pressure applied for any gas piping system according to the standards?

The minimum test pressure applied for any gas piping system, according to the National Fuel Gas Code, is 3 psi. This pressure is essential to ensure that the system is capable of operating safely under normal circumstances and is free of leaks.

Testing at this minimum pressure helps identify any weak points within the piping that may not withstand the operating pressures encountered during regular use. It is a crucial step in the installation and maintenance of gas piping systems to confirm their integrity before the system is put into operation.

Higher test pressures may be used depending on the specifics of the installation or local amendments to the code, but 3 psi is the standard baseline requirement, ensuring a consistent level of safety across various installations.