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Fluid Conductors. (covered in Ch.4 of Vickers text) Joe Untener 10/24/02. Fluid Conductors. General term for the various types of lines that convey hydraulic fluid to different parts of the system. They include: Steel pipe Steel tubing Flexible hose. Steel Pipe. Earliest method used

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Fluid conductors l.jpg

Fluid Conductors

(covered in Ch.4 of Vickers text)

Joe Untener

10/24/02


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Fluid Conductors

  • General term for the various types of lines that convey hydraulic fluid to different parts of the system. They include:

    • Steel pipe

    • Steel tubing

    • Flexible hose


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Steel Pipe

  • Earliest method used

  • Fairly low cost

  • Seamless, galvanized, black

  • Various pressure ratings

  • Threaded connections


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Steel Pipe

  • Wall thickness varies (ID not OD)

  • Schedule 40, 80, 160

  • Black Pipe

  • Galvanized not recommended for hydraulic use

  • Burst Pressure/Safety Factor



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Pipe Threads

  • NPT – National Pipe Tapered connections

    Not recommended

  • NPTF – National Pipe Tapered Fuel

    Superior sealing b/c roots an crests engage before flanks – avoiding spiral leakage.



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Pipe Fittings

  • Pipe can only have male threads

  • Pipe can’t be bent

    Therefore, MANY fittings –

    tees, elbows, unions, nipples,

    and flange fittings




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Steel Tubing

  • A desirable alternative to pipe

  • Leak-free joints (and less of them!)

  • Reusable threads

  • Bent to any shape

  • Higher pressure capability with less bulk and weight

  • Many sealing options…..




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Flexible Hose

  • Should only be used when relative motion occurs

  • SAE sets standards

  • Various fitting options



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Lip Seals

  • For rotating shafts



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Calculating Size Requirements

  • Simple Q=VA calculations

  • Tables for some velocities

  • Pressure requirements after a decision by the designer about appropriate safety factor


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References

  • Eaton-Vickers Text, Industrial Hydraulics Manual, 4th ed, 1999

  • Esposito, Fluid Power, Prentice Hall, 2000

  • Swagelok.com

  • Parker-Hannifin.com