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5" Large Diameter Hose (LDH), Supply Hose <br />When the City acquired Aerial 11 the apparatus came with 600' of 4" large diameter hose <br />(Supply hose). This is the hose that we use to connect the fire engine to the hydrant. This <br />apparatus is supposed to carry 1000' of supply hose, but it only had 600'. So, the supply hose <br />was deficient. Where do we get the 1000' of supply hose from? The Insurance Services Office <br />Verisk (ISO) bases its rating for a home or business that is 1000' from a hydrant as properties <br />that are covered by a fire hydrant. The hydrant spacing in the City is less than 1000'. Our <br />current spacing is 350'. This is why we carry 475' of 5' Large Diameter Hose on our small <br />engines. Aerial 21 carries 1000' of 5" Large Diameter Hose. Aerial 11 carried 500' of 5" Large <br />Diameter Hose along with 500' of 4" Large Diameter Hose. The goal with purchasing the 500' <br />of 5" Large Diameter Hose with the used fire engine would be to convert the 4" hose to 5" hose. <br />The reason for using 5" hose is so advantageous over 4" hose is that 5" hose flows twice as much <br />ONE VISION. ONE MISSION. LINO LAKES PUBLIC SAFETY DEPARTMENT. <br />