What minimum working pressure should fittings used on the discharge of the liquid transfer pump be rated for?

The minimum working pressure for fittings used on the discharge of the liquid transfer pump must be rated for 350 PSIG. This is because fittings must withstand pressures well above the maximum pressures they may encounter during operations to ensure safety and integrity.

In liquid propane systems, where liquid transfer pumps are involved, the pressures can vary significantly based on the temperature and pressure conditions of the system, so using fittings rated for 350 PSIG is a prudent choice. This rating provides a safety margin to prevent failures or leaks that could result from pressure fluctuations or spikes, which are not uncommon in liquid transfer operations.

By specifying a working pressure of 350 PSIG, regulations and safety standards help to safeguard against potential hazards associated with high-pressure gas systems, ensuring that the components involved maintain their structural integrity under expected conditions.