Which working pressure rating is required for fittings used with liquid LP Gas at pressures over 125 psig?

The correct choice for fittings used with liquid LP Gas at pressures exceeding 125 psig is indeed 250 psig. This rating is important to ensure the safety and integrity of the system under high pressure conditions. Fittings that are rated for at least 250 psig are designed to withstand the stress and potential risks associated with operating at these elevated pressures.

Liquid propane can create significant internal pressures in the system, especially during changes in temperature and when the gas is in a liquid state. Using fittings that are rated below this threshold, such as those rated at 150 psig or 200 psig, would pose a risk of equipment failure or leaks, which can be dangerous. The specified working pressure rating ensures that the fittings can safely accommodate the operational demands without risk of rupture or failure.

Selecting components with appropriate ratings is a critical aspect of maintaining a safe and reliable propane system. In this case, 250 psig fittings provide the necessary safety margin for handling liquid LP Gas under the specified conditions.