Hose
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HOSE GENERAL DESCRIPTION TYPES OF HOSES PTFE HOSES HYDRAULIC HOSE FLEXIBLE METAL HOSES STRIPWOUND METAL HOSES CORRUGATED HOSES General description of hose includes following information: 1. 2. 3. 4. 5. 6. 7.
Inner tube material outer tube material Reinforcment Temperature range Service factor ( Ratio:-min. bursting pressure : recommended working pressure) Application Dimensional specifications • Internal dia. (mm/inch) (Also referred as Nominal size) • External dia. (mm/inch) • Working pressure (bar/psi) • Min bursting pressure (bar/psi) • Min bend radius (mm/inch) • Weight (Kg.m)
Hose: a flexible conduit consisting of a tube, reinforcement, and usually an outer cover. Hose assembly: a general term referring to any hose coupled with end fittings of any style attached to one or both ends Braid: the woven portion of a hose used as reinforcement to increase pressure rating and add hoop strength. Various materials such as polyester, cotton or metal wire are used. A hose may have one or more braids, outside or between layers of hose material. Composite hose: non-vulcanised hose that consists of the following: An internal wire helix; A multi-ply wall of thermoplastic films and reinforcing fabrics in proportions that give the required physical properties and provide a complete seal. (Note: The film content may be built of tubular films.) A cover consisting of fabric with an abrasion resistant polymeric coating; An external helix wire. Bend radius: the radius of a bent section of hose measured to the innermost surface of the curved portion. Bend radius, minimum: the smallest radius at which a hose can be used. For Metal Hose: -the radius of a bend measured to the hose centrelines, as recommended by the manufacturer. Bend radius, dynamic: the radius at which constant or continuous flexing occurs.
Pressure, rated working (or) Pressure, maximum allowable working: the maximum pressure at which a hose or hose assembly is designed to be used. Pressure, working (or) Pressure, service: the maximum pressure to which a hose will be subjected, including the momentary surges in pressure, which can occur during service. Abbreviated as WP. Working temperature: the temperature range of the application may include the temperature of the fluid conveyed or the environmental conditions the assembly is exposed to in use. TYPES OF HOSES: PTFE HOSES TOP 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 HOSES Multipurpose Oil, Air and Water hose (Low pressure)
TOP
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
•
Service factor: 4:1 (min. burst pressure : recommended working pressure)
•
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
HYDRAULIC HOSE WITH SMOOTH PTFE LINING (HIGH PRESSURE)
TOP
z 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) TOP
Description • Inner tube:
seamless corrugated polytetrafluorethylene (PTFE) tube
•
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
SINGLE SMOOTH ptfe TUBE
Description •
Inner tube:
seamless smooth polytetrafluorethylene (PTFE)
•
Temperature range: -50°C to +200°C
•
Application: water base, petroleum base or synthetic base hydraulic fluids, corrosive and high temperature gases and liquids at low pressure, electrical isolation applications
FLEXIBLE METAL HOSES
TOP
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
TOP
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 packing 1. cotton 2. stainless wires 3. apyrous 4. 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
Applications Non rigid connections for conveying gases and semi solid materials Dust and fume collections Engine exhaust and flexible tail pipe applications Hot air blower and suction hose application Liner for corrugatedhose and braid assemblies Steam hose protection They can also be of packed or unpacked type
Types of packing
1. 2. 3. 4.
cotton stainless wires apyrous elastomeric
• CORRUGATED HOSES
TOP
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
•
Temperature range: - 200ºC to + 500ºC
Polygonal stripwound stainless steel exhaust hose
Description •
Inner tube: AISI 304 stainless steel medium pitch, polygonal cross-section
•
Temperature range: - 200ºC to + 500ºC
HOSES FOR WATER AND STEAM Steel wire reinforced rubber water hose (low pressure)
Description •
Inner tube: seamless non-toxic synthetic rubber
•
Service factor: 5:1 (min. burst pressure : recommended working pressure)
•
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
•
Temperature range: 0°C to +120°C
•
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
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: layers of high resistance synthetic textile and one high tensile steel wire helix
•
Temperature range: 0°C to +65°C
•
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
•
Service factor: 5:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: 1 external galvanized steel braid
•
Temperature range: - 10ºC to + 70ºC
•
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
•
Outer tube: black, oil, weather and abrasion resistant synthetic rubber
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: 2 high tensile synthetic textile braids
•
Temperature range: - 40ºC to + 100ºC
•
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 antistatic characteristics
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: layers of high resistance synthetic textile and one high tensile steel wire helix
•
Temperature range: - 30ºC to + 90ºC
•
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
•
Outer tube: black, oil, weather and abrasion resistant synthetic rubber
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: 1 high tensile synthetic textile braid
•
Temperature range: - 35ºC to + 100ºC
•
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
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: 1 high resistance synthetic textile braid
•
Temperature range: - 25ºC to + 90ºC
•
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
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
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
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: high resistance synthetic textile braids
•
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
•
Reinforcement: high resistance synthetic textile braids
•
Temperature range: 0°C to +60°C
•
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
•
Temperature range: 0°C to +60°C
•
Application: food industry
Hose Fittings Barb: the portion of a fitting (coupling) that is inserted into the hose, usually comprised of two or more radial serrations or ridges designed to form a redundant seal between the hose and fitting. Barbed and ferrule fitting: a two-piece hose fitting comprised of a barbed insert (nipple), normally with peripheral ridges or backward-slanted barbs, for inserting into a hose and a ferrule, usually crimped or swaged.
Serrations: bumps, barbs, corrugations, or other features that increase the holding power of the device Shank: that portion of a fitting, which is inserted into the bore of a hose. Banjo Fitting- a through bolted designed featuring a hollow circle or "donut" attached to one end of the fitting barb so that the inner diameter is along the hose axis. Barbed inserts- for low or medium pressure air, water and fluids. Machined brass with serrated shank; NPT or NPTF male and solid female, and NPSM swivel female; thread seal to NPT or NPTF female, and ball end or washer seal to NPSM female. Attached with bands or clamps.
Band Clamp - use with low or medium pressure and suction service. Pre-formed flat stainless steel, high carbon steel. Attached with special locking band tool.
Double Bolt Clamp - use with low or medium pressure and suction service with large sizes of combination nipples or couplings. Cast malleable iron, plated, and brass. Applied over hose and bolted into position.
Single Bolt Clamp - use with low pressure and suction service on shank couplings, combination nipples, and pipe nipples. Cast malleable iron, plated. Attached by bolting tightly on hose.
Wire Hose Clamp - suitable for medium pressure air, water or general purpose hose; good for hose with helical wire or corrugations; available in larger sizes for pin lug, serrated pipe nipple or combination. Pre-formed round wire made of stainless steel, galvanized steel, copper, bronze or aluminum. Wire ends pulled and crimped with special tool or machine.
Reference URL’s: 1. 2. 3. 4.
http://www.balflex.com/Catalogue.asp http://www.bengalind.com/prod.htm http://www.precisionhose.com/index.htm http://www.tamparubber.com/hosecmet.htm
Inner tube material outer tube material Reinforcment Temperature range Service factor ( Ratio:-min. bursting pressure : recommended working pressure) Application Dimensional specifications • Internal dia. (mm/inch) (Also referred as Nominal size) • External dia. (mm/inch) • Working pressure (bar/psi) • Min bursting pressure (bar/psi) • Min bend radius (mm/inch) • Weight (Kg.m)
Hose: a flexible conduit consisting of a tube, reinforcement, and usually an outer cover. Hose assembly: a general term referring to any hose coupled with end fittings of any style attached to one or both ends Braid: the woven portion of a hose used as reinforcement to increase pressure rating and add hoop strength. Various materials such as polyester, cotton or metal wire are used. A hose may have one or more braids, outside or between layers of hose material. Composite hose: non-vulcanised hose that consists of the following: An internal wire helix; A multi-ply wall of thermoplastic films and reinforcing fabrics in proportions that give the required physical properties and provide a complete seal. (Note: The film content may be built of tubular films.) A cover consisting of fabric with an abrasion resistant polymeric coating; An external helix wire. Bend radius: the radius of a bent section of hose measured to the innermost surface of the curved portion. Bend radius, minimum: the smallest radius at which a hose can be used. For Metal Hose: -the radius of a bend measured to the hose centrelines, as recommended by the manufacturer. Bend radius, dynamic: the radius at which constant or continuous flexing occurs.
Pressure, rated working (or) Pressure, maximum allowable working: the maximum pressure at which a hose or hose assembly is designed to be used. Pressure, working (or) Pressure, service: the maximum pressure to which a hose will be subjected, including the momentary surges in pressure, which can occur during service. Abbreviated as WP. Working temperature: the temperature range of the application may include the temperature of the fluid conveyed or the environmental conditions the assembly is exposed to in use. TYPES OF HOSES: PTFE HOSES TOP 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 HOSES Multipurpose Oil, Air and Water hose (Low pressure)
TOP
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
•
Service factor: 4:1 (min. burst pressure : recommended working pressure)
•
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
HYDRAULIC HOSE WITH SMOOTH PTFE LINING (HIGH PRESSURE)
TOP
z 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) TOP
Description • Inner tube:
seamless corrugated polytetrafluorethylene (PTFE) tube
•
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
SINGLE SMOOTH ptfe TUBE
Description •
Inner tube:
seamless smooth polytetrafluorethylene (PTFE)
•
Temperature range: -50°C to +200°C
•
Application: water base, petroleum base or synthetic base hydraulic fluids, corrosive and high temperature gases and liquids at low pressure, electrical isolation applications
FLEXIBLE METAL HOSES
TOP
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
TOP
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 packing 1. cotton 2. stainless wires 3. apyrous 4. 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
Applications Non rigid connections for conveying gases and semi solid materials Dust and fume collections Engine exhaust and flexible tail pipe applications Hot air blower and suction hose application Liner for corrugatedhose and braid assemblies Steam hose protection They can also be of packed or unpacked type
Types of packing
1. 2. 3. 4.
cotton stainless wires apyrous elastomeric
• CORRUGATED HOSES
TOP
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
•
Temperature range: - 200ºC to + 500ºC
Polygonal stripwound stainless steel exhaust hose
Description •
Inner tube: AISI 304 stainless steel medium pitch, polygonal cross-section
•
Temperature range: - 200ºC to + 500ºC
HOSES FOR WATER AND STEAM Steel wire reinforced rubber water hose (low pressure)
Description •
Inner tube: seamless non-toxic synthetic rubber
•
Service factor: 5:1 (min. burst pressure : recommended working pressure)
•
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
•
Temperature range: 0°C to +120°C
•
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
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: layers of high resistance synthetic textile and one high tensile steel wire helix
•
Temperature range: 0°C to +65°C
•
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
•
Service factor: 5:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: 1 external galvanized steel braid
•
Temperature range: - 10ºC to + 70ºC
•
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
•
Outer tube: black, oil, weather and abrasion resistant synthetic rubber
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: 2 high tensile synthetic textile braids
•
Temperature range: - 40ºC to + 100ºC
•
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 antistatic characteristics
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: layers of high resistance synthetic textile and one high tensile steel wire helix
•
Temperature range: - 30ºC to + 90ºC
•
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
•
Outer tube: black, oil, weather and abrasion resistant synthetic rubber
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: 1 high tensile synthetic textile braid
•
Temperature range: - 35ºC to + 100ºC
•
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
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: 1 high resistance synthetic textile braid
•
Temperature range: - 25ºC to + 90ºC
•
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
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
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
•
Service factor: 3:1 (min. burst pressure : recommended working pressure)
•
Reinforcement: high resistance synthetic textile braids
•
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
•
Reinforcement: high resistance synthetic textile braids
•
Temperature range: 0°C to +60°C
•
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
•
Temperature range: 0°C to +60°C
•
Application: food industry
Hose Fittings Barb: the portion of a fitting (coupling) that is inserted into the hose, usually comprised of two or more radial serrations or ridges designed to form a redundant seal between the hose and fitting. Barbed and ferrule fitting: a two-piece hose fitting comprised of a barbed insert (nipple), normally with peripheral ridges or backward-slanted barbs, for inserting into a hose and a ferrule, usually crimped or swaged.
Serrations: bumps, barbs, corrugations, or other features that increase the holding power of the device Shank: that portion of a fitting, which is inserted into the bore of a hose. Banjo Fitting- a through bolted designed featuring a hollow circle or "donut" attached to one end of the fitting barb so that the inner diameter is along the hose axis. Barbed inserts- for low or medium pressure air, water and fluids. Machined brass with serrated shank; NPT or NPTF male and solid female, and NPSM swivel female; thread seal to NPT or NPTF female, and ball end or washer seal to NPSM female. Attached with bands or clamps.
Band Clamp - use with low or medium pressure and suction service. Pre-formed flat stainless steel, high carbon steel. Attached with special locking band tool.
Double Bolt Clamp - use with low or medium pressure and suction service with large sizes of combination nipples or couplings. Cast malleable iron, plated, and brass. Applied over hose and bolted into position.
Single Bolt Clamp - use with low pressure and suction service on shank couplings, combination nipples, and pipe nipples. Cast malleable iron, plated. Attached by bolting tightly on hose.
Wire Hose Clamp - suitable for medium pressure air, water or general purpose hose; good for hose with helical wire or corrugations; available in larger sizes for pin lug, serrated pipe nipple or combination. Pre-formed round wire made of stainless steel, galvanized steel, copper, bronze or aluminum. Wire ends pulled and crimped with special tool or machine.
Reference URL’s: 1. 2. 3. 4.
http://www.balflex.com/Catalogue.asp http://www.bengalind.com/prod.htm http://www.precisionhose.com/index.htm http://www.tamparubber.com/hosecmet.htm
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