What is the required pressure rating for underground components in sprinkler systems?

The required pressure rating for underground components in sprinkler systems is 150 psi. This standard is set to ensure that all underground piping and fittings can withstand the pressures typically encountered in fire protection systems without experiencing failures. This pressure rating is essential because underground components need to be durable enough to handle both the operational water pressures and the environmental conditions they face, such as soil movement and water table fluctuations.

Choosing 150 psi as the standard provides a balance between adequate pressure handling and the reality of what most systems will experience in everyday operation. Higher pressure ratings are not typically necessary for underground components, as they are engineered to function optimally within this established range. This rating helps to ensure safety and reliability in the performance of fire sprinkler systems.