What is the maximum pressure stated by ASME for pneumatic tests?

• A. 10 psig
• B. 15 psig
• C. 25 psig
• D. 40 psig

Answer: (C)

The maximum pressure stated by ASME for pneumatic tests is 25 psig. This standard is established to ensure safety while conducting these tests, as pneumatic testing involves the use of gases, which can be more hazardous than liquids. The lower limit of pressure for pneumatic tests minimizes risks associated with potential gas leaks or explosive failures that can occur under higher pressures.

This standard reflects the need for careful consideration of both the physical properties of gases and the integrity of the piping systems. By limiting the pressure to 25 psig, it helps in managing the energy stored in compressed gases, which is critical for the safety of personnel and equipment during testing.

Understanding this pressure limit is crucial for pipefitters and those involved in testing systems, as it not only affects procedures but also ensures compliance with safety regulations and standards set forth by ASME.