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Fluid Conductors

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

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  1. Fluid Conductors (covered in Ch.4 of Vickers text) Joe Untener 10/24/02

  2. 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

  3. Steel Pipe • Earliest method used • Fairly low cost • Seamless, galvanized, black • Various pressure ratings • Threaded connections

  4. Steel Pipe • Wall thickness varies (ID not OD) • Schedule 40, 80, 160 • Black Pipe • Galvanized not recommended for hydraulic use • Burst Pressure/Safety Factor

  5. Steel Pipe Sizing

  6. 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.

  7. Thread Types

  8. Pipe Fittings • Pipe can only have male threads • Pipe can’t be bent Therefore, MANY fittings – tees, elbows, unions, nipples, and flange fittings

  9. Engineered Fittings

  10. Flange Fittings

  11. 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…..

  12. Tubing Fittings

  13. Proprietary Fittings

  14. Flexible Hose • Should only be used when relative motion occurs • SAE sets standards • Various fitting options

  15. O-ring Seal Performance

  16. Lip Seals • For rotating shafts

  17. Cup Seals

  18. Calculating Size Requirements • Simple Q=VA calculations • Tables for some velocities • Pressure requirements after a decision by the designer about appropriate safety factor

  19. References • Eaton-Vickers Text, Industrial Hydraulics Manual, 4th ed, 1999 • Esposito, Fluid Power, Prentice Hall, 2000 • Swagelok.com • Parker-Hannifin.com

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