What is the maximum allowed steam purity for use in turbines?

The maximum allowed steam purity for use in turbines is critical for maintaining efficiency and preventing damage to the turbine components. The correct choice indicates that the acceptable level of total dissolved solids (TDS) in the steam is 0.03 mg/L. This low level of TDS is crucial because impurities in the steam can lead to several issues, including corrosion, scale formation, and erosion of turbine blades.

High levels of TDS can also adversely affect heat transfer efficiency and may lead to operational problems over time. Keeping TDS within this strict limit helps ensure that the steam is as pure as possible, which in turn protects the turbine and enhances its operational reliability.

In contrast, higher thresholds of TDS, such as those presented in the other options, would be inappropriate for turbine operation; they would increase the risk of equipment damage and reduce performance. It's important for power engineers to adhere to stringent steam purity standards to ensure the longevity and efficiency of their systems.