Dry Fire Hydrant Design #38 - Suction Head Choice
 
By President Mark Davis
December 31, 2020
 

We sometimes get asked about suction head choice on our bridge mount dry fire hydrants. In general, we prefer using a male suction head with polymer cap because the head is stored in a "facing up" position to prevent condensation forming ice in colder weather. The two photos showing a female head in this news story were taken in December 2020 in the mid-Atlantic area and show just a small build-up of ice from condensation in the female swivel after just a couple nights of cold temperatures. Generally not a big but it can be if folks don't check and maintain their DFH connection....especially in cold weather climates.

 

Joseph Guyther January 12, 2021 at 11:40 PM
Always a decision the AHJ or the FD has to make but the female suction head choice does have one advantage - not requiring a 6" double female to hook up the suction hose. Not all FDs carry a 6" DF on their engine. Many FDs do carry a 6" x 4 1/2" DF. In that case a 4 1/2" suction head might the choice even though the 4 1/2" fitting may restrict the maximum flow capability slightly.