What is the maximum permissible pressure in a standard cast iron system?

The maximum permissible pressure in a standard cast iron heating system is 160 psi. Cast iron is a material commonly used in boiler construction due to its durability and ability to withstand high temperatures. However, it has inherent limitations regarding pressure. Specifically, the 160 psi threshold is based on the mechanical properties of cast iron, which can become brittle and less reliable at higher pressures. Operating beyond this limit can significantly increase the risk of failure, leading to potential safety hazards.

The choice of 160 psi reflects established safety standards and industry practices that prioritize safe operation while maintaining efficiency. In contrast, pressures exceeding this limit are not suitable for cast iron systems, aligning with best practices in boiler operation and maintenance. This is why the identified pressure of 160 psi is recognized as the upper safe limit for standard cast iron systems.