Does a post indicator valve (for a dry system) on the outside of a building require a knox or any type of pad lock to secure it?
I would say your Post Indicator Valve was non-compliant with the Life Safety Code requirements for electronic supervision
Excerpt from 2015 NFPA 101, Life Safety Code:
126.96.36.199.1 Where supervised automatic sprinkler systems are required by another section of this Code, supervisory attachments shall be installed and monitored for integrity in accordance with NFPA 72, National Fire Alarm and Signaling Code, and a distinctive supervisory signal shall be provided to indicate a condition that would impair the satisfactory operation of the sprinkler system.
A.188.8.131.52 NFPA 72, National Fire Alarm and Signaling Code, provides details of standard practice in sprinkler supervision. Subject to the approval of the authority having jurisdiction, sprinkler supervision is also permitted to be provided by direct connection to municipal fire departments or, in the case of very large establishments, to a private headquarters providing similar functions. NFPA 72 covers such matters. System components and parameters that are required to be monitored should include, but should not be limited to, control valves, water tank levels and temperatures, tank pressure, and air pressure on dry-pipe valves. Where municipal fire alarm systems are involved, reference should also be made to NFPA 1221, Standard for the Installation, Maintenance, and Use of Emergency Services Communications Systems.
Control valves including Post Indicator Valves must be electronically supervised, according to most building safety codes. Chains and locks are fine if you want them, but they are not an acceptable substitute for electronic supervision such as tamper switches.
I agree with Milton where the system is required to be supervised by 101, however, NFPA #13-184.108.40.206.2.1 allows for other options - locking, seals, etc. - where the system is not required to be electronically supervised. I would suggest locking the valve open in either case to keep from having the handle walk away.
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