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5-inch (13 cm) flex suction hose with Storz fittings, mounted on an engine. Flexible suction hose (Flex suction or suction hose), not to be confused with hard suction hose in U.S., is a specific type of fire hose used in drafting operations, when a fire engine uses a vacuum to draw water from a portable water tank, pool, or other static water source.
Hard suction hose A flexible rubber hose reinforced with a steel core to prevent collapse from atmospheric pressure when drafting; connected between the intake of a fire pump and a water supply and must be used when drafting. Also called hard hose, hard sleeve, or hard intake/suction hose. [5] Helmet
[14] Hard-suction hose comprises multiple layers of rubber and woven fabric encapsulating an internal helix of steel wire. Some very flexible hard-suction hoses use a thin, polyvinyl chloride cover with a polyvinyl chloride plastic helix. Suction hose ranges in nominal inside diameter from 2.5 to 6.0 in (64 to 152 mm).
Additionally, suction hose requires the use of suction gaskets to prevent air from entering, which are not used on other types of hoses, which use gaskets that seal with the addition of water pressure (and sometimes leak when not enough pressure is present). 2 + 1 ⁄ 2-inch attack port with 2.5-7.5 NH threads
To reduce drafting friction and obtain a larger flow or higher lift, a larger cross-section of suction hose is employed. For example, using a five-inch (127 mm) hose, a pump that could lift 500 US gallons per minute (30 L/s) up 23 feet (7.0 m) would only be able to lift the same amount of water 12.5 feet (3.8 m) through a 3.5-inch (89 mm) hose.
I suggest that the current lead be moved into a section with a title such as "fire hoses", as its two main functions appears to be: (1) to define the difference between a Hard suction hose and a fire hose, and (2) describe a Hard suction hose; and a new lead created. Done. Pyrotec 19:42, 22 August 2009 (UTC)