Final answer:
It is true that in a high-pressure boiler plant with a capacity of over 750,000 Btu, safety standards typically require a flow-sensing device to cut off fuel in case of loss of circulating flow, akin to safety mechanisms in nuclear reactors.
Step-by-step explanation:
The question asks whether it is true or false that in a high-pressure boiler plant with a capacity of over 750,000 Btu, a flow sensing device is required to cut off fuel in case of loss of circulating flow. In the context of engineering and safety for high-pressure boiler plants, such as those used in power generation, it is critical to have safety mechanisms in place to prevent accidents. These safety mechanisms are designed to respond to various failure modes, including the loss of coolant or circulating flow.
In the case of nuclear reactors, such as pressurized water reactors, there are several safety features that are similarly designed to prevent overheating and potential meltdown. Water in such reactors acts not only as a coolant but also as a moderator for the nuclear reaction; it slows down the neutrons to sustain the chain reaction. If the reactor overheats and water is lost, the chain reaction is halted, which is an inherent safety feature. Nonetheless, in extreme circumstances, additional safety features like auxiliary cooling water and pumps are required to manage the residual heat from radioactive fission products.
Pertaining to the original question, building on the concept of these important safety features in nuclear reactors, it's reasonable to infer that in a high pressure boiler system of significant size (over 750,000 Btu), you would similarly need a flow sensing device that would cut off the fuel supply to avoid overheating and damage should there be a loss of circulating flow. While specifics can vary by jurisdiction and the boiler's design, such a requirement is typical as part of industry safety standards to protect against unsafe operating conditions.