The minimum size water supply for a drench-type emergency shower and eye wash is?

The minimum size water supply for a drench-type emergency shower and eye wash is determined by safety and regulatory standards to ensure adequate flow and pressure during an emergency situation. A diameter of 1 1/4 inches is specified because it allows for sufficient water flow to quickly deliver a large volume of water to cleanse contaminants from the body and eyes effectively.

In emergency situations, it's critical that water delivery systems can operate effectively under varying conditions and provide immediate relief. A 1 1/4 inch pipe is capable of achieving the necessary flow rates as dictated by relevant standards, ensuring that the shower and eyewash can provide the life-saving measures they are designed for. Smaller pipe sizes would not be able to deliver the required volumes, potentially compromising the effectiveness of the emergency equipment. This size has been established to meet the needs outlined in regulatory guidelines, including those from organizations like ANSI and OSHA regarding workplace safety.