Are air bleeders required to be installed on dry standpipe systems? I cannot find any code which requires them. Does anyone know where I can find this information?
It will be no use to install air bleeders or air release valve in a dry stand pipe system, since it is not filled of water at normal condition.
Thank you for your help. I was mistaken when I referred to the system as simply "dry". The more appropriate classification is a "manual dry" system. Does you know of any kind of requirements for pressure relief? I might be overthinking the issue, but if we connect and start pumping water into the system where does the air go?
normally you dont need pressure relief for manual dry systems, because generally in a manual dry standpipe the hose valve connection or landing valve is already a pressure restricting type that will not exceed to 100 psi for trained personnel or firefighter
In NFPA 14 2013 22.214.171.124.4 a relief valve is required in a automatic dry system. I see no requirement or reason to need a relief valve on a manual dry system.
Recently tested a manual dry standpipe system in a light rail transit tunnel. Had 1 air bleeder on each end and 2 in center. As soon as system is charged with water, either by manually opening city water valve or fire department FDC, bleeders open and you can tell the air is being exhausted. They are referred to as air release valves on the drawings. I can not answer if the are required per NFPA. NFPA 502 Standard for Tunnels does have a 10 minute time limit to fill, not sure if they help with this or not. Our fill time was much less. They are more of a design concept to release trapped air and aid in draining of the system when done.
For our dry manual standpipes in buildings, there are no air release valves.
Automatic air venting valve is recommended in dry or wet standpipes. Please refer to clause 126.96.36.199.2 of NFPA 13 and it's further explanation in both handbook and Annex A of the said clause. There are many cross referencing between NFPA 14 and NFPA 13.
Per NFPA 13 2013 A.188.8.131.52.2 is referencing sprinkler systems. It goes on further to state the objective of venting is to reduce the amount of oxygen trapped in the system that will fuel corrosion and microbial activity.
A manual dry system is not designed to be charged outside of fire operations or testing and will not significantly benefit the system.
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