What methods can be used to test a safety or relief valve for its rated capacity?

The accumulation test and the amount of fuel burned are effective methods for testing a safety or relief valve for its rated capacity.

When conducting an accumulation test, the valve is subjected to pressure conditions that gradually increase to determine whether it will open at the specified set pressure and relieve the excess pressure effectively. This test ensures that the valve can handle the overload appropriately, providing a measure of its operational reliability under maximum pressure conditions.

Additionally, measuring the amount of fuel burned during operation gives insight into the capacity of the boiler and helps correlate it with the relief capacity of the valve. This method establishes a relationship between the operating conditions and the safety device's performance, ensuring safety measures are sufficient for the given operational demands.

This context provides a good understanding of why the selected method is pivotal for assessing the reliability and efficiency of safety or relief valves in high-pressure boiler systems.