Large tanks with hemispherical heads on both ends are identified as which type of pressure system?

• A. Low pressure
• B. Medium pressure
• C. High pressure
• D. Ultra high pressure

Answer: (C)

Large tanks featuring hemispherical heads on both ends are classified as high-pressure systems primarily due to their structural design and the operational conditions they accommodate. The hemispherical design allows for greater strength and resistance against internal pressure, making it suitable for handling liquids or gases at elevated pressures.

High-pressure tanks are engineered to safely store substances requiring containment at pressures typically above 15 psi, with many industrial applications going significantly higher, often exceeding 100 psi. The hemispherical shape aids in distributing the stress exerted by the high-pressure content more evenly across the tank's surface, thus enhancing the overall integrity of the tank.

In contrast, low pressure systems are designed for operations below 15 psi and do not possess the same structural requirements as those intended for high-pressure storage. Medium pressure systems, while capable of holding higher pressures than low pressure, still do not reach the thresholds that classify a system as high pressure. Ultra high pressure systems are specialized for applications that require containment of very high pressures, often above 1000 psi, and have different design considerations. Therefore, the correct choice of high pressure for this type of tank accurately reflects its capacity and safety features.