PMT 103A Industrial Hygiene Practice Test

The main idea is that emergency eyewash devices must deliver a minimum, continuous flow so the eyes can be rinsed quickly and effectively after exposure. For portable eyewash stations, that minimum flow is 0.4 gallons per minute (about 1.5 liters per minute). This rate is chosen to provide enough water to flush contaminants from both eyes over the typical recommended flush duration, usually around 15 minutes, without being so high that it creates instability or waste.

Choosing 0.4 gpm ensures the device is capable of delivering a sufficient stream to rinse away chemicals promptly. A flow rate lower than that, like 0.2 gpm, wouldn’t provide adequate irrigation. Higher values, such as 0.6 gpm or 1.0 gpm, exceed the minimum requirement but aren’t the standard that the requirement specifies; they may still be acceptable in some setups, but 0.4 gpm is the recognized minimum you’re asked to know.