Wall hydrants are often used on high-rise rooftops, parking garages, or large expansive areas.
Wall hydrants are also provided where is not possible to provide freestanding fire hydrants.
Many AHJ's will differ to a couple subsections in NFPA 13 & 24 and require them where warehouses or other structures are located along railways and no available firelane access to any type of exterior fire hydrant is feasible. The wall hydrant becomes a part of the fire suppression system indoor supply and usually is its own riser or can come off existing overhead and feeds multiple wall hydrant connections along exterior walls of a building. The wall hydrant will be required to be hydraulically calculated for outside hose allowance (sometimes based on system occupancy usage, but AHJ may dictate otherwise). It allows the use of the fire department to connect manually on the exterior wall hydrant connection and act as an additional hose supply connection. Reference NFPA 13 2016 Ed. 18.104.22.168 .NFPA 13 & 14 do not have specific references to wall hydrants and NFPA 24 has limited references as well. NFPA 24 2019 Ed. provides where the hydrant shall be permitted & consultation with AHJ is required in 7.2.3 & 7.2.4. Fig A.7.2.3. indicates typical wall hydrant installation.
This is the only case I know of one being used by Ops. Can’t open boxcar door. Use a weed burner type torch to heat door. Per RR and everyone on site apparently was not uncommon practice, as hard as that is to believe. Contents fire.
Those big bars with a curve on the end normally used to move a car a few inches at a time to line up with building door can be used repeatedly to slowly move rail car away from door until switch engine arrives.
Boxcars now an oddity it seems.
The wall PIV should prevent freeze damage.
...with ball drip valve at low point.
In some cases AHJ request wall hydrants if there are not street type hydrant (Dry Barrel), also if the premises, yards around a building will have combustible materials.
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