Wastewater Conveyance - Wastewater Operators - page 193

figure 4.23 Wire-reinforced hose.
figure 4.24 Wire-woven hose.
Various hoses made from natural latex, silicone rubber, and pure
gum are available. The pure gum hose will safely carry acids, chemi-
cals, and gases. Small hoses of natural latex, which can be sterilized,
are used in hospitals for pharmaceuticals, blood, and intravenous solu-
tions, as well as in food-handling operations and laboratories. Silicone
rubber hose is used in situations where extreme temperatures and
chemical reactions are possible. It is also used in aircraft starters,
where it provides compressed air in very large volumes. Silicone rubber
hose works successfully over a temperature range from -57°C (-70°F) to
232°C (450°F).
4.11.3.4 Metallic Hose
The construction of a braided, flexible, all-metal hose includes a
tube of corrugated bronze. The tube is covered with the woven metallic
braid to protect against abrasion and to provide increased resistance
to pressure. Metal hose is also available in steel, aluminum, Monel ® ,
stainless steel, and other corrosion-resistant metals in diameters up to
3 in. and in lengths of 24 in. In addition to providing protection against
abrasion and resistance to pressure, flexible metal hose also dampens
vibration. A plant air compressor, for example, produces a consider-
able amount of vibration. The use of flexible hoses in such machines
increases their portability and dampens vibrations. Other consider-
ations include constant bending at high temperatures and pressures,
which can be extremely damaging to most other types of hoses.
Other common uses for metallic hoses include serving as steam
lines, lubricating lines, gas and oil lines, and exhaust hose for diesel
engines. The corrugated type, for example, is used for high-temperature,
high-pressure leakproof service. Another type of construction is the
interlocked flexible metal hose, used mainly for low-pressure applica-
tions. The standard shop oil can has a flexible hose for the flexible spout.
Other metal hose, with a liner of flexible, corrosion-resistant material, is
available in diameters of up to 24 in.