What type of pressure test must be conducted on cylinders at least every 5 years?

• A. Exterior visual inspection
• B. Hydrostatic pressure test
• C. Functional gas leak test
• D. Structural integrity assessment

Answer: (B)

The hydrostatic pressure test is essential for ensuring the safety and integrity of gas cylinders used in anesthesia and other medical applications. This test involves filling the cylinder with a liquid, typically water, and then pressurizing it to a specified level. Through this process, inspectors can identify any weaknesses, defects, or leaks in the structure of the cylinder.

Conducting this test every five years helps maintain compliance with safety regulations and standards, ensuring that the cylinders are capable of withstanding high pressures without failure. By revealing any potential issues that could lead to hazardous situations, the hydrostatic pressure test plays a critical role in preventing accidents associated with cylinder storage and usage in medical environments.

While other options might contribute to the assessment of the cylinder's condition, they do not provide the same level of detailed information regarding the cylinder's capacity to hold pressure safely over time. Thus, the hydrostatic pressure test stands out as the required method for thorough safety assurance on a five-year cycle.