At what pressure should the low-side relief valve of an LPG system discharge?

The low-side relief valve of an LPG system is designed to ensure safety by preventing excessive pressure buildup within the system that could lead to failure or rupture of components. The correct discharge pressure of the relief valve is typically set at 2-3 times the regulator delivery pressure. This provides a buffer that allows the system to safely handle transient pressure spikes without risking damage while ensuring the system operates under safe pressure limits.

Setting the relief valve at this level balances safety and functionality; it allows the system to function normally under typical operating conditions while providing adequate protection in scenarios of pressure excursion. A discharge setting lower than this might not offer sufficient protection, whereas a setting higher than this may lead to an increased risk of damage to the system components before the relief valve activates. Thus, the 2-3 times standard is a well-accepted industry practice for ensuring safe operation of LPG systems.