by Grant Lobdell

The current, 2020 Edition of NFPA 25 Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems states that any sprinkler that shows signs of loading and/or corrosion detrimental to the sprinkler performance shall be replaced. (5.2.1.1.1) By simply looking at the sprinkler, it can be difficult to know when loading and/or corrosion is detrimental to the performance. This document has been put together with some real-life examples of loaded and/or corroded sprinklers that have response times outside the acceptable range as defined by NFPA 25 to help those trying to make this call. If there continues to be any doubts about a sprinkler’s performance, it should be tested to evaluate those concerns, or it should be replaced.

The required response times listed are based on the RTI equation as defined in the eleventh edition of UL 199, the RTI requirements found in the 2020 edition of NFPA 25, and the test conditions at Dyne Fire Protection Labs.

If you have any questions regarding this article, please contact Dyne Fire Protection Labs at lab@dyneusa.com or (800) 632-2304.

©Dyne Fire Protection Labs 2020

Required Response Time: < 132.8 seconds Response Time: 194.9 seconds
Required Response Time: < 132.8 seconds Response Time: 158.9 seconds
Required Response Time: < 135.9 seconds Response Time: 215.6 seconds
Required Response Time: < 132.8 seconds Response Time: 181.6 seconds
Required Response Time: < 133.8 seconds Response Time: 198.8 seconds
Required Response Time: < 142.9 seconds Response Time: Did Not Activate
Required Response Time: < 133.8 seconds Response Time: Did Not Activate
Required Response Time: < 142.9 seconds Response Time: 143.4 seconds
Required Response Time: < 142.9 seconds Response Time: Did Not Activate
Required Response Time: < 132.8 seconds Response Time: Did Not Activate
Required Response Time: < 123.1 seconds Response Time: Did Not Activate
Required Response Time: <132.8 seconds Response Time: Did Not Activate
Required Response Time: < 22.9 seconds Response Time: Did Not Activate
Required Response Time: < 142.9 seconds Response Time: Did Not Activate
Required Response Time: < 135.9 seconds Response Time: Water Seal Did Not Release
Required Response Time: < 142.9 seconds Response Time: Water Seal Did Not Release
Required Response Time: < 142.9 seconds Response Time: Did Not Activate
Required Response Time: < 22.9 seconds Response Time: Water Seal Did Not Release
Required Response Time: < 135.9 seconds Response Time: Did Not Activate

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