What is the maximum pressure and temperature for cast iron boiler construction?

The maximum pressure and temperature limits for cast iron boiler construction are crucial for ensuring safety and durability in boiler operations. Cast iron is known for its strength and resistance to thermal stress, but it also has specific limitations when it comes to maximum allowable pressure and temperature.

In this context, the correct choice provides a maximum pressure of 1700 kPa and a maximum temperature of 230°C. These figures align with industry standards for cast iron materials, which are generally able to withstand higher pressures and temperatures compared to other materials used in boiler construction. This capacity allows cast iron boilers to be efficient in various heating applications while minimizing the risk of failure.

The other options suggest various combinations of pressures and temperatures that are either too low or not typically acceptable for cast iron construction. Low pressure limits do not utilize the material's strengths effectively, while combinations that exceed the standard for safety and operation would pose risks. Therefore, the correct choice accurately reflects the maximum operational limits of cast iron boilers, considering both pressure and temperature capabilities within safe engineering practices.