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Tag Archive: hoseterminations

  1. What are Some Challenges of Terminating Metal Hose?

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    ANAMET Industrial Solutions produces thousands of feet of metal hose. No matter the diameter or material of metal hose, cutting hose to a prescribed length can result in a ragged edge. Deburring and fitting installation overcomes this ragged edge.
     

    Cutting hose results in sharp edges, no matter the hose material

    Demands of Flexible Hose

    Compression and extension in metal hose adds complexity to cutting, deburring and termination operations. Since the hose is pushed or pulled to the saw during the cutting process, the hose length can vary after cutting. Like pushing a chain uphill, there is more than meets the micrometer. Something always slides.

    Metal hose is flexible with elastic coils resulting from roll forming metal strip

    Deburring

    Deburring is a subtractive process, removing material from the hose, breaking sharp edges. Deburring rounds the sharp edges on the inner and outer edges of the hose end. Deburring operations must be kept to strict tolerances to sustain prescribed hose lengths. This is more than just “measure twice and cut once.”

    Terminations

    Installing connectors on the metal hose is an additive process, with different challenges. Hose terminating parts are intended to protect hose contents and provide strain-free connection at the joint. Putting a terminating part on a round hose decreases the inner diameter and increases the outer diameter at the hose end. Fittings go over the lip of the hose, terminating hose with a threaded boss, brazing, welding, gluing, deformable collars, and compression or swaging of a ferrule. These options increase diameter.

    Ferrules are a metal cap with a hole in the top. The ferrule encloses the lip of the hose, however inconsiderate compression and swaging can deform the hose end to a hexagon, square or oval shape.

    Ferrules are available in various materials, with locking features as needed

    Tolerances

    Attention to tolerance makes up for the demands of different manufacturing processes. Allowances are also made within the restrictions of speed, cost and quality outcome. Because quality is sometimes equated with precision measurement, experience in the metal working industry shows that every thousandth of an inch in precision doubles production costs (How Dimensional Tolerances Impacts Part Production Costs | Keller (kellertechnology.com). Accounting for manufacturing limitations and opportunities prevents surprises and quality failures. Knowing how much variation is acceptable (allowable tolerance versus tight tolerance) can enable delivery of an affordable product that meets design requirements.

    Design Development

    Since there are many complex factors in creating quality metal hose, here are some considerations for design development:

    • Are there strict material requirements for the metal hose and termination?
      • Corrosion Resistance
      • Ground Path
      • Non-Ferrous
    • Must all edges be broken to avoid exposure of sharp edges? Deburring and burnishing may be required.
    • Must hose and fittings meet a regulatory requirement?
    • What termination method fulfills design requirements?
    • How much flexibility is needed in the hose and terminals?
    • What is the total length needed for hose and terminals?
    • Is the tolerance stack-up for the hose and termination loose or restricted?
    • Must the hose and termination fit in a confined space?
    • How much may the inner diameter of the hose be decreased by the termination?
    • How much may the outer diameter of the hose be increased by the termination?

    Assistance with Metal Hose Features and Requirements

    ANAMET Industrial Solutions personnel have experience delivering millions of feet of metal hose for industry worldwide. We are familiar with the demands of metal hose production and installation. Our customers have benefitted from our experience in custom cut length and termination of flexible metal hose, installing custom ferrules, threaded fittings, bayonet fittings and cord grips.

    We want to help you succeed. Please contact us if your product includes flexible metal hose.

    If you already know your metal hose requirements, please use our Conduit Request Form.

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