If an electric boiler operates at a maximum of 1100 kW, how many safety valves are required?

The requirement for the number of safety valves on a boiler is determined by its maximum capacity and the potential pressure within the system. In general, boilers need to be equipped with enough safety valves to ensure that if one valve fails or is incapable of relieving pressure due to the boiler's operation at maximum capacity, the remaining valve(s) can still provide adequate pressure relief.

For an electric boiler that operates at 1100 kW, the American Society of Mechanical Engineers (ASME) guidelines or local codes often stipulate that a certain number of safety valves must be installed based on the boiler's rating. For electric boilers with capacities in this range, the appropriate practice typically leads to a minimum requirement of two safety valves. This redundancy is crucial to ensure safety and compliance with regulations, as it ensures that excessive pressure can be relieved effectively, thus protecting the boiler and preventing hazardous situations.

Overall, the correct answer reflects the necessity of having multiple safety mechanisms in place to mitigate risks associated with boiler operation.