What size hole should be created for venting oxygen during inerting or purging?

Creating a hole for venting oxygen during the inerting or purging process is critical for safety and efficiency. The size of the hole is important in ensuring adequate airflow without compromising the integrity of the tank or system being serviced. A 1/8" hole is typically specified for venting because it is large enough to allow the gradual and controlled escape of gases, which helps maintain the balance between removing flammable vapors and ensuring that the environment doesn't become overly pressurized or dangerously oxygen-deficient.

Using a hole that is too large could lead to rapid pressure changes or the sudden influx of oxygen, which is not ideal when working to create an inert atmosphere. Conversely, a hole that is too small may not allow sufficient gas venting, potentially leading to unsafe conditions. Thus, the 1/8" hole strikes a balance, ensuring safety while effectively managing the purging process.