Engine Company

Large-Diameter Hose: An Update, Part 2

Issue 11 and Volume 160.

Note: Part 1 was published in the October 2007 issue of Fire Engineering. AN ENGINE COMPANY PERFORMING A REVERSE hoselay will lay hose from the fire to a hydrant, where it will connect the apparatus with a short section of suction hose and then pressurize the hoselines with its pump. Pumping hoselines from an engine connected at a hydrant takes advantage of the hydrant’s available gallons-per-minute (gpm) flow and the pump’s capacity. This is a common way for fire departments that do not have large-diameter hose (LDH) to operate. Fire departments using LDH can also benefit by performing a reverse lay and pumping LDH at a hydrant, because it maximizes the hose’s flow capabilities. Although LDH has significantly less friction loss than smaller conventional hose, hydrant pressure alone may be insufficient to overcome the friction loss in LDH when it is flowing a large volume of water or it is…

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