What is a primary feature of turbine casings?

A primary feature of turbine casings is their robust construction designed to withstand high pressure build-up. Turbine casings are essential components in steam turbine machinery, as they provide structural support and contain the internal components of the turbine, including the rotor and blades. The casings must be constructed from materials that can endure the intense pressure and temperature conditions present during operation, which is crucial for maintaining the efficiency and safety of the turbine system.

Lightweight construction, while possibly desirable in some applications, is not a primary feature of turbine casings due to the need for strength and resilience under operating conditions. Plastic materials are not suitable for turbine casings given their inability to handle the high temperatures and pressures typically seen in steam turbines. Finally, turbine casings are not specifically designed for low inlet steam conditions; they are built to manage a range of operating variables, including both high-pressure and high-temperature steam.