Quality Foils india pvt ltd Hisar, Haryana

Metal wire braid on hose assembly restrain the hose elongation under pressure. Hence the force due to the internal pressure is transferred to the braid. Wire diameter and total number of wires are calculated to suit the pressure rating. A second layer of braid may be used to increase pressure rating. Braid coverage is another important criteria. Less coverage leads to hose squirm under pressure while bending. Over coverage braid does not tighten the outer diameter of hose as there is clearance between them. Braid is designed to have optimum coverage. Types of Braid Tubular or Beam Braid: Tubular Braid is manufactured by grouping single wires and then braiding them into basket waive pattern that tightens when braid is stretched.   Grade SS 304 and SS 321 and SS 316 are also available subject to requirement.

• Size50 NB to 1000 NB

Bellows Manufacturing at world class quality with high technology to meet the various Industrial Application of customer’s requirements at all Technical aspects.Temperature withstand from -196 Deg to 1000 deg C and Pressure Ranges from Full Vacuum to 1000 PSI, Standards and it is an assembly designed to safely absorb the heat-induced expansion and contraction of construction materials, to absorb vibration, to hold parts together, or to allow movement with out disturbing the inner flow media.

Manufacturing range: ¼" NB TO 10” NB Grade: SS 304, SS 321 and SS 316 and SS 316L Standard: BS-6501 & ISO-10380 Metal hose design criteria Wall thickness: Wall thickness of the hose is decided by the manufacturer considering the flexibility, pressure rating and corrosion requirements. Thick and thin walled hoses have both advantages and disadvantages. Hence, wall thickness of hose shall be selected depending on the application. Complete application details of hose assembly should be informed to the manufacturer to select suitable wall thickness.   Hose Reinforcement In some cases, where sharp bend at the ends of hose assembly is not under control, reinforcement is necessary.   Hose Protection External protection - heat Ceramic cloth/sleeve or silica cloth/sleeve are wrapped or inserted over the braided hose to protect the braid from heat and hot particles. These protective materials are suitable for temperature up to 1200 ºC. External protection – corrosive atmosphere. Rubber or PVC sleeve protection can be given to hose assemblies to protect it from corrosive atmosphere contaminated with Hydrogen Supplied, Chloride etc. External protection – mechanical. An interlock armor protection can be given to full hose assemblies to protect it from external mechanical damages and abrasion. Some cases, coil spring.   Height and pitch of convolution Height and pitch of convolution of metallic hose is another design criteria to be considered. High convolution gives excellent fatigue life but has poor pressure capacity. A closely pitched hose with normal convolution height can give good cycle life at high pressure. As the wall thickness in this case is less, the corrosion life is less. Suitable combination of pitch, wall thickness and convolution height are selected to suit the application. Outputs based on User Input Size of hose Suitable size and length of hose assemblies are suggested based on pressure drop requirement, installation requirement, dynamic properties, etc.   Material Fluid compatibility, temperature, environmental contamination are considered in selecting suitable material.   Type of hose Suitable type of hose is suggested based on working pressure, temperature and installation type. Special hose also can be designed to suit the operating condition.   Protection / Reinforcement External protection sleeve for temperature, abrasion etc., suitable reinforcement for working condition are suggested.   Internal sleeve / Liner Internal sleeve / liner are suggested for smooth laminar flow at high flow velocity and to Hose Storage Cleaned hoses stored with its ends properly caped / closed. Smaller size hoses- up to 80 NB can be coiled with radius not less than the specified bend radius. Hoses 100 NB and above shall be stored in straight lengths or with higher bend radius. Avoid contact of carbon steel parts with hose during storage. Pressure test the hose before use when stored for a long period. Hose Cleaning No internal cleaning is required if the hoses are installed permanently in the plant. If flushing of piping is done on any plant with the hosed in installed condition, it is recommended to remove the hoses and clean internally. Internal fleshing of hose is done by passing free flow DM water (Chloride content not more than 30 PPM) into the hose. If the hose assemblies are used intermittently (in case of corrosive chemicals) , after every usage, they are cleaned, dried and stored properly. Flexible metallic hoses are used under following working conditions. High temperature (up-to 650 º C) Low temperature (down-to -196 º C) High pressure/ High Vacuum Vibration / Relative movement between mounting points. Electric conductivity. High Shelf Life Requirement.      

Ceramic clothsleeve or silica clothsleeve are wrapped or inserted over the braided hose to protect the braid from heat and hot particles. These protective materials are suitable for temperature up to 1200 ºC. Rubber or PVC sleeve protection can be given to hose assemblies to protect it from corrosive atmosphere contaminated with Hydrogen Supplied, Chloride etc.

Wall thickness of the hose is decided by the manufacturer considering the flexibility, pressure rating and corrosion requirements. Thick and thin walled hoses have both advantages and disadvantages. Hence, wall thickness of hose shall be selected depending on the application.

Type of Hose Assemblies Based on flexibility, the Annular corrugated hoses are categorized as follows according to ISO 10380-2003. Type #1: This type of hoses are highly flexible and is used for special application where high flexibility and fatigue life is required. The cyclic life is minimum 10, 000 cycles when subjected to short bend radius. Type #2: This type of hoses have moderate flexibility and widely used in Industrial application. The cyclic life is minimum 10, 000 cycles when subjected to wide bend radius. Type #3: This type of hose have low flexibility and is suitable for static applications . The cyclic life is 30 cycles and mostly used unbraided. User Input requirements Size of the hose Nominal bore size / Nominal size of connecting system / Length. End fitting details Flanged / threaded / Welded / coupling, etc. Material Material of hose, braid and fittings (SS 304/ SS 304L/ SS 316L/ SS 321. etc ) Working pressure Maximum pressure at extreme condition. Working temperature Maximum temp. of fluid passing through or surrounding temperature. Installation details May be explained by a simple sketch. Dynamic properties if any Amplitude and frequency of movements, vibration etc. May be given by sketch. Fluid passing through the hose complete specification of fluid with concentration, mixture, etc. Flow details Velocity, Mass flow rate, density of fluid, etc.