Question

Dead-weight or weighted-lever safety valves may be used:

a) when pressure is less than 100 psi
b) never
c) only by permission of boiler inspector
d) under 15 psi

Answer 1

Safety valves such as dead-weight or weighted-lever are subject to specific regulations and typically may be used for systems under 15 psi or with special permission. In complex systems like pressurized water reactors, safety valves are part of the critical control mechanisms to ensure safe operation.option d is correct

Step-by-step explanation:

The safety valves like dead-weight or weighted-lever models are used to prevent an overpressure condition by releasing excess pressure from a vessel or system. Regarding their usage, specific regulations and guidelines are often prescribed by industrial standards or local authorities, which may vary by location and the type of boiler or pressure vessel. In some cases, low-pressure systems under 15 psi might utilize these types of safety valves, but as the initial question suggests, often these valves might be used upon special permission or according to the inspector's guidelines.

For example, in a pressurized water reactor, control mechanisms, including safety valves, are critical to maintaining proper pressure levels and ensuring the safety of the operation. As mentioned in Figure 32.27 of the reference material, control rods and safety systems are essential for controlling fission reactions and preventing overheating that could lead to a failure of the system.