What is the requirements of the heat detector detection time which serves a deluge system?
There's no required heat detection time for heat detectors in NFPA standards. Maybe UL 521 standard specifies a maximum response time for heat detectors.
To activate a deluge system, fire should be detected and confirmed, so that action can be taken. I believe there should have a guideline for such a detection time.
Most designer's specifications show compliance with NFPA 72 for heat detection systems for deluge sprinkler systems.
Where heat detectors are used, NFPA 72 requires that they be spaced on smooth ceilings less than 10 ft high, in accordance with their listed spacing. For ceilings higher than 10 ft, NFPA 72 contains reduction factors to be applied to the listed spacing. Therefore, as ceiling height increases, the installed spacing becomes less than thelisted spacing. The required reductions can have a dramatic effect on detector response time during a fire.
A heat detector with a listed spacing of 50 ft is more sensitive than one with a listed spacing of 30 ft. The listed spacing of a detector is determined by fire testing and cannot be used directly as part of any engineering calculations.
The heat detector's listed spacing should be related to the performance required by NFPA 72 for life safety purposes.
What section of NFPA 72 will I find this?
If you are using the 2019 edition of NFPA 72, consult with Section 17.6.
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