Which casing style is typically used for high pressure in centrifugal compressors?

The vertical split (barrel casing) style is typically used for high pressure in centrifugal compressors due to its robust construction and ability to withstand the substantial forces exerted by high-pressure gases. This design provides good rigidity and strength, which helps to maintain the integrity of the casing under extreme operating conditions.

Vertical split casings allow for easier assembly and disassembly of the compressor components, making maintenance and inspection more straightforward, which is especially important in high-pressure applications where reliability is critical. These types of casings effectively handle the balancing of forces across the compressor components, which is essential for operational efficiency and longevity.

While sectional casings and horizontal split casings can also be used in some high-pressure situations, they may not offer the same level of strength and structural integrity as the vertical split casing, which is why the latter is preferred in those applications.