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The table in NFPA 13 for different hazard classifications and hose allowances has a range for the water supply duration (table 11.2.3.1.2 in NFPA 13-2016). For instance, Ordinary Hazard has a required water supply duration of "60-90" minutes.
When is the lower part of the range used, and when is the higher used? Posted anonymously by a member for discussion. Discuss this | Submit a Question | Subscribe
4 Comments
Wayne Ammons
3/4/2019 08:32:10 am
NFPA 13, 2016 Edition: 3/4/2019 10:24:37 am
To build on Wayne's response, unless the waterflow alarm devices are monitored as noted in the referenced NFPA section, you must use the higher duration value for the given occupancy. By using electrically supervised devices that are monitored at an approved, constantly attended location, the system design is permitted to take advantage of a reduced duration of the required water supply. Essentially an alarm or supervisory condition will be brought to the Owner's attention quickly, allowing for a prompt response to appropriately address an abnormal system conditions.
Franck
3/4/2019 11:26:05 am
Note anyway that some AHJ, such as insurance companies, mat require the higher value in all cases. Especially for a new design/project. But may consider as an acceptable situation for an existing location with an existing water supply if the higher value is not obtained AND if the requirement of 11.2.3.1.3 indicated by Wayne is achieved.
Alan
3/8/2019 11:29:19 am
Depends also on response time and effectiveness of responding emergency personnel Leave a Reply. |
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