Associate Safety Professional Practice Exam

What is the minimum pressure for a hydrostatic test of a compressed air bottle according to ASME code?

1. 100% of maximum operating pressure

2. 125% of maximum operating pressure

3. 150% of maximum operating pressure

4. 175% of maximum operating pressure

The correct answer is: 150% of maximum operating pressure

The correct answer is based on the guidelines set by the ASME (American Society of Mechanical Engineers) code for pressure testing of compressed gas cylinders. For a hydrostatic test, the minimum required test pressure is typically established to ensure the integrity and safety of the cylinder under conditions that exceed normal operating parameters. In this context, a hydrostatic test pressure of 150% of the maximum operating pressure serves a critical purpose. This elevated pressure allows for the detection of any weaknesses, leaks, or structural faults that may not be evident under normal conditions. It provides a margin of safety that ensures the cylinder can withstand pressures greater than those it will encounter during typical use. Specifically, a test pressure set at this level ensures that the cylinder is robust enough to handle potential overpressure scenarios without failure, thus enhancing safety for users and preventing catastrophic incidents. Other options listed represent lower thresholds than 150%, which would not offer the same assurance of reliability and safety. Therefore, 150% of the maximum operating pressure is the standard and appropriate requirement for the hydrostatic testing of compressed air bottles as per ASME code.