Dry Fire Hydrant Design 22 - Deployable Bridge-Mount Design, Strafford, New Hampshire
 
By President Mark Davis
January 17, 2019
 

This News Story is actually about a DFH installation that we completed in Strafford, New Hampshire in 2016. The installation on Crown Point Road was one of several in Strafford and used our swivel-mount design. Permission was not granted by the bridge owner to drill holes in the bridge rail posts for bracket attachment so we had to use the rail post attachment studs instead. Berry's River (small but plenty of water) flowed under the bridge and was reported to flow even during most freezing conditions. The system used a teardrop style stream strainer that rests on the streamed when deployed. Capable of a 1,000 gpm flow, the design allows for rapid deployment and suction hose set-up during water supply operations.
 
Suction head position when the system is deployed.
Suction head position when the system is deployed.
Shown here in the deployed position, our swivel-mount installation provides quick access to Berry's River.
Shown here in the deployed position, our swivel-mount installation provides quick access to Berry's River.
 
The system was attached using the bridge rail post studs...not our preferred attachment...but it worked just fine.
The system was attached using the bridge rail post studs...not our preferred attachment...but it worked just fine.
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Stowed and ready for use. By mounting on the downstream side of the bridge, the system is protected from storm debris during times of high flow in the river.
Stowed and ready for use. By mounting on the downstream side of the bridge, the system is protected from storm debris during times of high flow in the river.