Rubber Covered LDH (TH-Supply)
Today, virtually every fire department uses these Rubber Covered LDH (TH-Supply) to move water efficiently. LDH Hose is flexible hose designed for the purpose of moving water ( or flame retardant ) between a pressurized water source and a pump that is supplying attack lines. It may also be used to relay water from one pumper to another over a long distance. Fire hose is generally considered to be LDH Hose when its interior diameter exceeds 3½ inches; fire and departments in the United States typically use LDH with diameters of 4, 5 or 6 inches.
LDH Hose is big-flow, low-pressure hose, which is both its defining feature and the reason for its popularity. Because friction loss in fire hose is entirely dependent upon flow, not pressure, the more capacity (GPM) a hose can carry, the less force (PSI) is needed for the delivery. This accounts for the ability of LDH to deliver greater water volume, over greater distances, with less friction loss than smaller diameter hose.
- LDH Hose is generally longer than smaller diameter hose. Standard lengths are typically 100 feet. Short lengths or pony lengths are used for hydrant hook-ups to charge pumper units.
- LDH Hose is rugged, but not indestructible. Manufacturing techniques include the extrusion of nitrile rubber in a Thru-The-Weave process or it may be manufactured by laminating the nitrile rubber cover and liner. In either case the entire length of the hose is seamless.
- LDH Hose is heavier than smaller diameter hose.
- LDH Hose plus water is very heavy. It is an accepted fire service understanding that 5-inch LDH will hold 1 gallon of water per foot of hose.
With water weighing 8.33 pounds per gallon, a 100-foot section of 5-inch LDH filled with water will weigh approximately 944 pounds. Hose connections are hard-coated / anodized aluminum. Although threaded connections are typical, the Storz, quick-action coupling has gained in popularity.
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