What type of casing is normally used for pressures above 10,000 kPa?

Using barrel casing for pressures above 10,000 kPa is appropriate due to its robust design that can withstand high pressure while maintaining structural integrity. Barrel casings are typically cylindrical and designed to handle the greater stresses and strains that come with elevated pressure conditions.

In high-pressure applications, the need for a strong containment system is essential to prevent failures or leaks, which can have severe safety and operational implications. The uniform thickness and strength of the barrel design also help in distributing stresses evenly, making it more suitable for those challenging operating conditions.

Other types of casings, such as single, split, or standard casing, may not possess the same level of strength or pressure handling capability necessary for situations where pressures exceed 10,000 kPa. Consequently, barrel casing is favored in these high-pressure settings, making it the correct choice for this question.