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Sandwell

Sandwell. Pump project report. Gases . Similarities Pumps – liquids Fans - gases Compressible Ideal gas law: density Pressure SI – Pa USCS – psi, in WG. Air movers. Fans: < 2psi Blowers: 2 to 10 psi Compressors: can be thousands of psi. Axial: . Radial (centrifugal). Fans.

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Sandwell

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  1. Sandwell Pump project report

  2. Gases • Similarities • Pumps – liquids • Fans - gases • Compressible • Ideal gas law: density • Pressure • SI – Pa • USCS – psi, in WG

  3. Air movers • Fans: < 2psi • Blowers: 2 to 10 psi • Compressors: can be thousands of psi

  4. Axial: Radial (centrifugal) Fans

  5. Axial Fan performance

  6. Fan selection Axial & centrifugal overlap Not interchangeable

  7. Air flow rate Pressure: total & static Air temperature Rotational speed Efficiency Operational life Construction material Drive arrangement Operating costs Price Space needs Layout of components Fan selection

  8. Fan selection • Availability • Delivery • Familiarity

  9. Fan curve development

  10. Fan rating • SCFM • ACFM • Steady displacement device

  11. Fan calculations • h = KsQ • V = 4005√P • P = C (V/1097)2ρ • Power = 0.000157Q P

  12. Fan Laws • Air flow varies directly with impeller speed • Static pressure varies with square of impeller speed • Fan power varies with cube of impeller speed.

  13. Specific speed • Design criteria

  14. Centrifugal fan • Widely used • BEP • Cost effective • High energy efficiency • Reduced fan wear • Reduced noise

  15. Accessory equipment Filters & screens Lubricators Coolers Dryers: refrigerator, absorbers, adsorber Traps & drains

  16. Compressed air costs • Most expensive utility in mill • Misuses • Open blowing • Sparging • Padding • Unregulated feed – diaphram pump • Cabinet cooling • Personnel use

  17. Compressed air costs - leaks

  18. Reading - Mott • Chapter 18: sections 1 through 5 • Chapter 13

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