The term fire hose refers to several different types of hose specifically designed for use in fighting fires. The most common one consists of one or more outer layers of woven fabric with an inner layer of rubber. It is usually manufactured in 50 ft (15.3 m) lengths with threaded metal connections on each end. Unlike other hoses, most fire hose is designed to be stored flat to minimize the space required. For example, the average fire pumper in the United States can carry 1,200 ft (366 m) of 2.5 in (64 mm) diameter fabric-covered, rubber-lined hose in a space about the size of a king-size bed.
The earliest recorded use of fire hose was in ancient Greece. According to the Greek author Apollodorus, one end of an ox's intestine was attached to a bladder filled with water. When the bladder was pressed, the water was forced through the long ox gut and was directed "to high places exposed to fiery darts."
The forerunner of the modern fire hose was invented in 1672 in Amsterdam, Netherlands, by Nicholas and Jan van der Heiden (Heides). Their discharge hose was made of leather with tightly sewn seams. Brass fittings were attached to each end to allow several sections to be coupled together. In 1698, they made a suction hose of heavy sailcloth coated with paint or cement to make it watertight. The hose was reinforced with internal metal rings to prevent it from collapsing under a vacuum.
Early leather hoses leaked badly, and their sewn seams were prone to rupture under pressure. The first riveted leather hose was developed in 1808 in Philadelphia by a group of volunteer firefighters. Their hose had seams held together by 20-30 metal rivets per foot (65-100 rivets per meter) to eliminate leaks. Two members of the group patented this design in 1817 and began manufacturing it. Although woven cotton and linen hoses were also introduced in the early 1800s, and rubber-coated hoses were introduced in 1827, none of these designs was developed enough to replace riveted leather hose until about the 1870s.
Modern fire hoses use a variety of natural and synthetic fabrics and elastomeres in their construction. These materials allow the hoses to be stored wet without rotting and to resist the damaging effects of exposure to sunlight and chemicals. Modern hoses are also lighter weight than older designs, and this has helped reduce the physical strain on firefighters.
Types and Sizes of Fire Hose
There are several types of hose designed specifically for the fire service. Those designed to operate under positive pressure are called discharge hoses. They include attack hose, supply hose, relay hose, forestry hose, and booster hose. Those designed to operate under negative pressure are called suction hoses.
Attack hose is a fabric-covered, flexible hose used to bring water from the fire pumper to the nozzle. This hose ranges in nominal inside diameter from 1.5 in (38 mm) to 3.0 in (76 mm) and is designed to operate at pressures up to about 400 psi (2,760 kPa). The standard length is 50 ft (15.3 m).
Supply and relay hoses are large-diameter, fabric-covered, flexible hoses used to bring water from a distant hydrant to the fire pumper or to relay water from one pumper to another over a long distance. These hoses range in nominal inside diameter from 3.5 in (89 mm) to 5.0 in (127 mm). They are designed to operate at pressures up to about 300 psi (2,070 kPa) for the smaller diameters and up to 200 psi (1,380 kPa) for the larger diameters. The standard length is 100 ft (30.6 m).
Forestry hose is a fabric-covered, flexible hose used to fight fires in grass, brush, and trees where a lightweight hose is needed in order to maneuver it over steep or rough terrain. Forestry hose comes in 1.0 in (25 mm) and 1.5 in (38 mm) nominal inside diameters and is designed to operate at pressures up to about 450 psi (3,105 kPa). The standard length is 100 ft (30.6 m).
Booster hose is a rubber-covered, thick-walled, flexible hose used to fight small fires. It retains its round cross-section when it is not under pressure and is usually carried on a reel on the fire pumper, rather than being stored flat. Booster hose comes in 0.75 in (19 mm) and 1.0 in (25 mm) nominal inside diameters and is designed to operate at pressures up to 800 psi (5,520 kPa). The standard length is 100 ft (30.6 m).
Suction hose, sometimes called hard suction, is usually a rubber-covered, semi-rigid hose with internal metal reinforcements. It is used to suck water out of unpressurized sources, such as ponds or rivers, by means of a vacuum. Suction hose ranges in nominal inside diameter from 2.5 in (64 mm) to 6.0 in (152 mm). The standard length is 10 ft (3.1 m).
Another suction hose, called a soft suction, is actually a short length of fabric-covered, flexible discharge hose used to connect the fire pumper suction inlet with a pressurized hydrant. It is not a true suction hose as it cannot withstand a negative pressure.
In the past, cotton was the most common natural fiber used in fire hoses, but most modern hoses use a synthetic fiber like polyester or nylon filament. The synthetic fibers provide additional strength and better resistance to abrasion. The fiber yarns may be dyed various colors or may be left natural.
Coatings and liners include synthetic rubbers such as styrene butadiene, ethylene propylene, chloroprene, polyurethane, and nitrile butadiene. These compounds provide various degrees of resistance to chemicals, temperature, ozone, ultraviolet (UV) radiation, mold, mildew, and abrasion. Different coatings and liners are chosen for specific applications.
Hard suction hose consists of multiple layers of rubber and woven fabric encapsulating an internal helix of steel wire. Some very flexible hard suction hose uses a thin polyvinyl chloride cover with a polyvinyl chloride plastic helix.
Hose connections may be made from brass, although hardened aluminum connections are more frequently specified because of their lightweight.
A fabric-covered fire hose has one or more layers of woven fabric as a reinforcement material. A hose with one layer is called single jacket hose and is used where light-weight is important or where the hose is expected to have infrequent service. A forestry hose is single jacket for light-weight. An industrial fire hose is single jacket because it sees infrequent use. A hose with two layers is called a double jacket hose and is used where weight is not as critical and where the hose is expected to have frequent, sometimes harsh use, as in urban fire service.
A jacketed hose is usually lined with a thin-walled extruded tube of rubber or another elastomer material that is bonded to the inside of the hose. This prevents the water from seeping through the hose jacket. Some forestry hose is made with a perforated rubber liner to allow it to "weep" a little water through the jacket as a protection against embers that might otherwise burn the hose.
Another type of fabric hose construction is called through-the-weave extrusion. In this design a single fabric jacket is fed through a rubber extruder. The extruder coats both the inside and outside of the fabric with a rubber compound to form both an inner liner and an outer coating at the same time. The extruder forces the rubber into and through the jacket weave to form an interlocking bond. This construction produces a lighter weight hose and is primarily used for larger-diameter supply hoses.
As the loom starts, the filler bobbins wind the filler yarn in a circle through the warp yarns. The inner and outer jackets are woven separately. If the outer jacket is to be coated, it is drawn through a dip tank filled with the coating material.
The Manufacturing Process
Fire hose is usually manufactured in a plant that specializes in providing hose products to municipal, industrial, and forestry fire departments. Here is a typical sequence of operations used to manufacture a double jacket, rubber-lined fire hose.
Preparing the yarn
Once the outer jacket is coated, it passes through an oven where the
Weaving the jackets
Extruding the liner
Forming the hose
Pressure testing the hose
In addition to the final pressure testing, each hose is subjected to a variety of inspections and tests at each stage of manufacturer. Some of these inspections and tests include visual inspections, ozone resistance tests, accelerated aging tests, adhesion tests of the bond between the liner and inner jacket, determination of the amount of hose twist under pressure, dimensional checks, and many more.
The trend in fire hose construction over the last 20 years has been to the use of lighter, stronger, lower maintenance materials. This trend is expected to continue in the future as new materials and manufacturing methods evolve.
One result of this trend has been the introduction of lightweight supply hoses in diameters never possible before. Hoses up to 12 in (30.5 cm) in diameter with pressure ratings up to 150 psi (1,035 kPa) are now available. These hoses are expected to find applications in large-scale industrial fire-fighting, as well as in disaster relief efforts and military operations.
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