What is the suitable working pressure for fittings used with vapor LP Gas at pressure not exceeding 125 psig?

The suitable working pressure for fittings used with vapor LP Gas at a pressure not exceeding 125 psig is established to ensure safety and functionality in a variety of applications. When fittings are rated for a pressure that matches the maximum operating pressure of the gas they will be used with, it allows for both safety and reliability.

In this case, if the maximum pressure of the vapor LP Gas is 125 psig, using fittings that are rated for 125 psig ensures that they can handle the system's pressure without risk of failure or leaks. This rating takes into account not just the operating conditions but also provides a margin for variables such as temperature fluctuations and minor pressure surges that can occur in the system.

Fittings rated above the maximum operational pressure, like those rated for higher pressures, can also be used, as they inherently provide a greater safety margin. However, selecting a fitting rated exactly for the system's maximum operating pressure (125 psig) is both standard practice and expected to ensure optimal performance without overspending on unnecessarily high-rated components.