hoses

HOSES

Following are some of the common types of hoses

PTFE HOSES

PTFE hoses have a very good chemical resistance to most fluids, resist to high temperatures, have non-sticking and very low-friction characteristics, have almost no aging, and can be constructed to achieve very good flexibility and pressure resistance.

Characteristics of PTFE hoses

Chemically resistant - PTFE hoses are extremely resistant to most conveyed fluids. The only reactants are extreme oxidizers and reducing agents (elementary sodium, fluorine, chlorine trifluoride and related compounds), and alkali metals (potassium and lithium).

Temperature resistant - PTFE has a very extensive working temperature range. PTFE hoses generally cover the range of -50°C to +200°C, which includes most industrial applications.

Non-sticking - PTFE offers no adherence to other substances. Even in alternate use of fluids, contamination risk of the fluid is very limited.

Low-friction - PTFE hoses also assure optimum flow rates of all conveyed fluids and very limited pressure losses in the fluid lines.

Non-toxic - PTFE is odor-, taste- and color-less and transmits none of these to the conveyed fluids. PTFE is a FDA approved material for food contact and PTFE hoses are excellent for the food industry.

Un-inflammable - PTFE does not have any flame propagation

Durable - Due to its chemically inert characteristic, PTFE hoses are virtually ageless. PTFE hoses have limitless shelf life. Weather resistance is also virtually limitless.

Applications

Due to its overall excellent chemical resistance, PTFE hoses are used in a very wide variety of industrial applications for conveyance of hot and cold gases, steam, water, synthetic and petroleum-base hydraulic fluids, as well as corrosive chemicals.

Due to its non-contaminant and non-contaminable characteristics, PTFE hoses are used in a wide variety of medical and laboratory apparatus, cosmetics, food industry, automotive and aeronautics industries.

HYDRAULIC HOSE WITH SMOOTH PTFE LINING (HIGH PRESSURE)

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Description

Inner tube: seamless smooth polytetrafluorethylene (PTFE)

Reinforcement: 1 high resistance stainless steel wire braid

Temperature range: -50°C to +200°C

Application: water base, petroleum base or synthetic base hydraulic fluids, corrosive

and high temperature gases and liquids

HYDRAULIC HOSE WITH CORRUGATED PTFE LINING (HIGH PRESSURE)

Description Inner tube: seamless corrugated polytetrafluorethylene (PTFE) tube

Reinforcement: 1 high resistance stainless steel wire braid



and high temperature gases and liquids

SINGLE SMOOTH ptfe TUBE

Description

Inner tube: seamless smooth polytetrafluorethylene (PTFE)



and high temperature gases and liquids at low pressure, electrical isolation applications

FLEXIBLE METAL HOSES

Metal hose is used when temperature extremes, corrosive media, or permeation preclude the use of rubber, PTFE, or plastic hose. Typical applications are found in steel making, chemical processing, paper manufacturing, petroleum refining, and in numerous other industrial applications.Where rigid connections are impractical, flexible metal hose provides non-rigid connections for conveying liquids, gases and semi-solids.

Following are the benefits and advantages of flexible metal hoses

High physical strength combined with light weight. Suitable for wide temperature range [-2700 C to + 7000C] Good corrosion resistance. Resistance to fire, moisture, abrasion and penetration. Absorbs vibration and noise from pumps, compressors, engines etc Compensates for thermal expansion or contraction of piping. Connects misaligned rigid piping. A flexible and quick option for right piping in difficult locations.

STRIPWOUND METAL HOSES

STRIP WOUND HOSES are manufactured by helically winding a pre-formed strip around a mandrel of the required size. A packing of copper wire, rubber or yarn may be provided within the folds during the manufacturing process to obtain liquid tightness. Special winding processes ensure a low leakage rate and high flexibility.

1. Square locked metal hoses

Square locked hose is a highly flexible low-pressure hose with many applications, including protective casing, electrical wiring conduit, and electronic shielding.These hoses can be packed or unpacked

Types of packing1. cotton2. stainless wires3. apyrous4. elastomeric

2. Interlocked metal hoses

Interlocked hose is made by folding the edges of the metal strips together. Interlocked hose is stronger than square locked hose and is ideally suited for fume and dry material handling.Features

High strength construction Temperature and corrosion resistant Flexibilty Can be formed and holds its shape

ApplicationsNon rigid connections for conveying gases and semi solid materialsDust and fume collectionsEngine exhaust and flexible tail pipe applicationsHot air blower and suction hose applicationLiner for corrugatedhose and braid assembliesSteam hose protection

They can also be of packed or unpacked type

Types of packing1. cotton2. stainless wires3. apyrous4. elastomeric

CORRUGATED HOSES

The corrugated hose is manufactured from a cylindrical, thin walled tube formed from rolled strip and joined at the seam by butt welding. Impressed into this tube is a corrugated annular profile. Annular corrugated hose has several advantages over helical hose. It is not subject to damaging torsional stress due to longitudinal expansion resulting from pressure rises. When the corrugations are closely spaced, the hose is referred to as "standard pitch" hose. When the corrugations are more widely spaced, the hose is referred to as "open pitch" hose.

The thickness of the metal strip, the height of the corrugations and the number of corrugations per foot all affect the performance characteristics of metal hose. Flexibility in corrugated hose is the result of the bending of the metal corrugations. Service life varies depending upon the severity of the flexing, the temperature, corrosive conditions, pressure and vibration to which the hose is subjected. is the result of the bending of the metal corrugations. Service life varies depending upon the severity of the flexing, the temperature, corrosive conditions, pressure and vibration to which the hose is subjected.

Unless restrained, corrugated hose will elongate when subjected to increasing internal pressure. This restraint is provided by a braided covering, consisting of a tubular sheath of woven metal wires fitted tightly over the corrugated hose and secured at each end. Flexibility of the corrugated hose is not appreciably affected by this wire braid covering. In addition, the braid provides squirm support and dampens vibration. In higher pressure applications, the use of additional braid covers will provide additional working pressure. Unbraided hose is satisfactory for vacuum and low pressure applications.

Corrugated hose is recommended for applications involving permanent bends, and in situations where flexing is predictable, that is, machine controlled. Also, whenever absolute leak prevention is essential, corrugated hose should be selected.

Braiding materials can be : stainless steels, steels, bronze, inconel, monel etc.

STAINLESS STEEL CORRUGATED HOSE

Stainless steel hoses facilitate relative movement of the parts to be connected, adapt to thermal expansion, resist to high pressure and offer good corrosion resistance to a wide range of fluids.

Braid provided on the inner tube plays an important role. When pressure is applied, unbraided corrugated hose tends to elongate axially. To restrain this an external layer of SS wire is provided on the hose. The braid is necessary to prevent elongation and to make the assembly pressure resistant.

Some times two or even three layer of braiding are provided for high pressure applications. The braiding is highly flexible and follows the movement of the hose.

The braiding is normally manufactured in SS 304 wire. SS 316 and SS 321

Annular Corrugated AISI 304 St Steel Hose

Description

Inner tube: AISI 304 stainless steel annular corrugated wide pitch

Reinforcement: one AISI 304 stainless steel braid

Temperature range: - 200ºC to + 500ºC

Helical Corrugated AISI 304 St St Hose

Description

Inner tube: AISI 304 stainless steel helicaly corrugated wide pitch

Reinforcement: one AISI 304 stainless steel braid


Polygonal stripwound stainless steel exhaust hose

Description

Inner tube: AISI 304 stainless steel medium pitch, polygonal cross-section


HYDRAULIC HOSES

Multipurpose Oil, Air and Water hose (Low pressure)

Description

Inner tube: seamless, oil-resistant synthetic rubber

Outer tube: black, oil, weather and abrasion-resistant synthetic rubber

Service factor: 4:1 (min. burst pressure : recommended working pressure)

Reinforcement: 1 synthetic textile braid

Temperature range: -40°C to +100°C (max. temperature recommended for water

base hydraulic fluids: +70°C; max. temperature recommended for air: +50°C)

Application: petroleum base hydraulic fluids, water base hydraulic fluids, water

and air

Lubricator Hose (High Pressure)

Description

Inner tube: seamless, oil resistant thermoplastic

Outer tube: black, oil, weather and abrasion resistant thermoplastic


Reinforcement: high tensile synthetic textile braids

Temperature range: - 40ºC to + 100ºC for water base hydraulic fluids: +70°C; max.

temperature recommended

Application: lubrication machines using all types of petroleum based lubricants and

greases

HOSES FOR WATER AND STEAM

Steel wire reinforced rubber water hose (low pressure)

Description

Inner tube: seamless non-toxic synthetic rubber


Reinforcement: 1high tensile steel braid

Temperature range: 0°C to +70°C

Application: pumping systems for water and non-corrosive liquids

Multi-spiral steel wire reinforced waterblasting hose (very high pressure)

Description

Inner tube: seamless synthetic rubber

Outer tube: black, oil, weather and abrasion resistant synthetic rubber

Service factor: 2.5:1 (min. burst pressure : recommended working pressure)

Reinforcement: 4 or 6 plies of spirally wrapped high tensile steel wire separated by

layers of synthetic rubber


Application: very high pressure water jet machines

Suction, delivery and return hose for water

Description

Inner tube: seamless water resistant synthetic rubber

Outer tube: black, smooth, weather and abrasion resistant synthetic rubber


Reinforcement: layers of high resistance synthetic textile and one high tensile steel

wire helix


Application: water suction & discharge general use

HOSES FOR AUTOMOBILES

Steel wire braid reinforced fuel line hose (low pressure)

Description

Inner tube: seamless nitrile rubber, resistant to oil


Reinforcement: 1 external galvanized steel braid


Application: automobile fuel lines, oil, gasoil and oil emulsion cooling water

Textile reinforced hydraulic brake hose (high pressure)

Description

Inner tube: seamless, brake fluid resistant synthetic rubber



Reinforcement: 2 high tensile synthetic textile braids


Application: non-petroleum base hydraulic brake lines for automobiles

HOSES FOR FUEL TRANSFER

Suction, delivery and return hose for oil, gasoline, diesel & other fuels

Description

Inner tube: seamless synthetic rubber inner tube, resistant to oil, gasoline, diesel and

fuels with up to 40% aromatic content, with anti-static characteristics

Outer tube: black, oil, weather and abrasion resistant synthetic rubber, with anti-static

characteristics


Reinforcement: layers of high resistance synthetic textile and one high tensile steel

wire helix


Application: suction & discharge of gasoline and fuels

HOSES FOR INDUSTRIAL GASES

Textile reinforced acetylene and oxygen twin hose (medium pressure)

Description

Inner tube: acetylene and oxygen resistant synthetic rubber



Reinforcement: 1 high tensile synthetic textile braid


Application: portable or production line acetylene welding equipment

Textile braid reinforced rubber air hose (medium duty)

Description

Inner tube: natural and synthetic rubber compound

Outer tube: black, weather and abrasion resistant, EPDM blended rubber compound


Reinforcement: 1 high resistance synthetic textile braid


Application: compressed air lines in portable and production line equipment water

lines in portable and production line equipment

HOSES FOR ABRASIVE & CORROSIVE FLOW

Dry cement discharge hose (low pressure)

Description

Inner tube: natural rubber compound

Outer tube: black, weather, heat and abrasion resistant rubber compound


Reinforcement: high resistance synthetic textile braids

Temperature range: up to + 60ºC

Application: discharge of dry cement and other dry bulk materials

Corrosive chemicals discharge hose (low pressure)

Description

Inner tube: acid resistant synthetic rubber compound

Outer tube: black, weather, heat, chemical and abrasion resistant rubber compound



Temperature range: up to + 60ºC

Application: discharge of acid, base and corrosive chemicals

PLASTIC HOSES

Corrosion resistant PVC hose with textile reinforcement

Description

Inner tube: seamless, chemically resistant, PVC compound

Outer tube: seamless PVC, lengthwise fluted



Application: agricultural insecticide and pesticide spraying

Food-quality PVC water hose

Description

Inner tube: seamless, non-toxic, food-quality PVC

Outer tube: seamless PVC

Reinforcement: 1 polyester braid


Application: food industry

Reference URL’s:

1. http://www.balflex.com/Catalogue.asp2. http://www.bengalind.com/prod.htm3. http://www.precisionhose.com/index.htm4. http://www.tamparubber.com/hosecmet.htm

hoses

Documents

60c application

90c application

100c application

recommended working pressure

seamless smooth polytetrafluorethylene

high temperature gases

temperature recommended

high pressure