The 2024 International Mechanical Code (IMC) has a new Pressure Releif Valve (PRV) discharge requirement that is an interesting desing requirement. The code has required the PRV “Discharge to a termination point that is readily visible and observable by the building occupants” for many years. But now, the 2024 edition requires…
(emphasis by me)
If the discharge termination point is not readily visible and observable, a leak detection monitoring device with alarm notification (and not automatic shut-off) is required.
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1006.6 Safety and relief valve discharge. Safety and relief valve discharge pipes shall be of rigid pipe that is approved for the temperature of the system. High-pressure-steam safety 1. Not be directly connected to the drainage system. 2. Discharge through an air break located in the same room as the appliance. 3. Not be smaller than the diameter of the outlet of the valve served and shall discharge full size to the air break. 4. Serve a single relief device and shall not connect to piping serving any other relief device or equipment. 5. Discharge to the floor, to the pan serving the boiler or storage tank, to a waste receptor or to the outdoors. 6. Discharge in a manner that does not cause personal injury or structural damage. 7. Discharge to a termination point that is readily visible and observable by the building occupants. If the discharge termination point is not readily visible and observable, a leak detection monitoring device with alarm notification (and not automatic shut-off) is required. 8. Not be trapped. 9. Be installed so as to flow by gravity. 10. Terminate not more than 6 inches (152 mm) above the floor or flood level rim of the waste receptor. 11. Not have a threaded connection at the end of such piping. 12. Not have valves or tee fittings. 13. Utilize piping material complying with Section 1202. |