What is the minimum required relieving capacity for all safety valves on a watertube boiler with 65 m2 of boiler heating surface?

To determine the minimum required relieving capacity for safety valves on a watertube boiler with a specified heating surface area, the established guideline involves calculating the safety valve capacity based on the boiler's heating surface.

For watertube boilers, the standard calculation is that for every square meter of heating surface, a relieving capacity of approximately 150 kg/h is required. In this case, with 65 m² of heating surface, the calculation goes as follows:

65 m² * 150 kg/h per m² = 9750 kg/h.

However, it's essential to note that there are some operational considerations and safety margins to take into account per applicable codes and standards. The minimum required relieving capacity often rounds up to accommodate variations in operation and safety requirements, especially when dealing with high-pressure situations.

By rounding, this leads us to a capacity of about 9815 kg/h when factoring in variations and safety margins, thus affirming that the first option represents the most practical and regulatory-compliant answer for a watertube boiler of this size.

This reasoning aligns with typical practices in power engineering, ensuring sufficient safety standards are upheld in equipment operations.