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Atmospheric Steam Lines

Atmospheric Steam Lines. Course Outline. Atmospheric Steam. The Basics Difference between atmospheric and pressure steam Steam Distributors General guidelines Recommended steam line materials Recommended sizing Atmospheric steam line rules and guidelines Condensate lines

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Atmospheric Steam Lines

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  1. Atmospheric Steam Lines

  2. Course Outline Atmospheric Steam • The Basics • Difference between atmospheric and pressure steam • Steam Distributors • General guidelines • Recommended steam line materials • Recommended sizing • Atmospheric steam line rules and guidelines • Condensate lines • Common errors and mistakes

  3. Atmospheric Steam Humidifiers Atmospheric Steam • There are two types of steam humidifiers: • Live Steam – Uses facility boiler steam for humidification • Atmospheric Steam – Steam generated by boiling water internal to unit • LS Humidifier • NHTC Electrode Humidifier

  4. What’s the Difference? Pressure vs. Atmospheric Steam Atmospheric Steam • Steam Pressure! • LS Humidifiers use pressurized steam from boilers, often with • temperatures in excess of 212°F (superheated steam) • 2 – 50 psi for LS Distributors (LS1,2,3 or SAM-e) • 5 – 15 psi for Steam Exchange • Atmospheric humidifiers generate steam at atmosphericpressure and • 212°F • What does that mean? • Atmospheric steam cannot be conveyed long distances under its own pressure • Condensation in atmospheric steam lines is much more significant than in pressurized steam lines • Atmospheric steam line length and sizing will greatly affect the humidifier output

  5. Where Does the Steam Go? Distribution Atmospheric Steam • xSD • Mini SAM-e • SAM-e • In Space Remote Mounted or Built on Blower Pack • Duct Distributors

  6. Main Rules for Atmospheric Steam Lines Atmospheric Steam • Follow recommended materials, size and length • Insulate with 1” pipe insulation • Slope the steam lines • Trap condensate

  7. Material for Steam Lines Atmospheric Steam *Insulating steam lines reduces steam losses

  8. Recommended Max Steam Runs Atmospheric Steam

  9. Equivalent Lengths Atmospheric Steam

  10. Electrode Steam line Chart Atmospheric Steam

  11. Steam Line Installation Back Pressure - NHTC Atmospheric Steam • Fill Cup • Maximum static pressure for electrode steam units is 6”w.c. • Limited by difference in water level height between fill cup and water level in the cylinder (Δh) • Higher static pressure (from duct or long steam line) may prevent cylinder from filling • Δh

  12. Steam Line Installation Back Pressure – GS/SE Atmospheric Steam • Fill Box • GS and SE humidifiers also produce steam at atmospheric pressure • Maximum static pressure for GS/SE units is 12”w.c. • Limited by difference in water level height between fill box and water level in the tank (Δh) • Δh

  13. Steam Line Installation Fill Cup Extension Kit - NHTC Atmospheric Steam • Fill Cup • Fill cup bracket • Over flow hose • Hose from fill valve • Fill hose to cylinder • Fill cup extension kit raises the fill cup 8.5”, increasing the maximum allowable static pressure from 6.5” to 10”w.c.

  14. Steam Line Installation Nortec Steam Hose Atmospheric Steam • Minimum 12” radius • Properly support steam hose • Minimum 12” rise • before bend/turn • *Condensate returned to • Unit or drain • Minimum 12” rise • before bend/turn • *To drain (air gap required) • Condensate at low point in steam hose • Minimum 12” rise • before bend/turn • *To drain (air gap required) • *Condensate should not be routed back to a sink used frequently by personnel.

  15. Steam Line Installation Nortec Steam Hose Atmospheric Steam • When using Nortec steam hose, ensure line is properly supported

  16. Steam Line Installation Upward Slope Atmospheric Steam • 12” • 2”

  17. Steam Line Installation Downward Slope Atmospheric Steam • 12” • 0.5”

  18. Steam Line Installation Hard Pipe Lines Atmospheric Steam • Distributor Above Humidifier • Distributor Below Humidifier • Clamped steam hose • Nortec steam hose may • be used for bends (min. • radius 12”) • Minimum Slope • 2” • Minimum 12” rise • before bend/turn • 12” • Minimum 12” rise • before bend/turn • P-Trap • Condensate Tee • *To drain (air gap required) • *Connection to the humidifier and distributor should be made with NORTEC steam hose

  19. Steam Line Installation Multiple Distributors Atmospheric Steam • Multiple Duct Distributors • Multiple RMBP • Steam lines should be kept as even as possible • Balancing valves may be required • Individually trap condensate before combining to common drain • Ensure minimum clearances between distributors or RMBP are maintained

  20. Steam Line Installation Multiple Units to a Single Distributor Atmospheric Steam • All steam lines must be combined right before or at the distributor • Why? • Condensate from one unit may flow back into the other units resulting in an error • Multiple Units

  21. Steam Line Installation Enlarging Steam Lines Atmospheric Steam • Steam lines can be over sized to compensate for longer steam runs • When enlarging or over sizing steam lines, ensure condensate is properly drained • Nortec steam hose • or copper pipe • Oversized copper • steam line

  22. Steam Line Installation Condensate Line Sizing Atmospheric Steam • Individually trap condensate before • combining to common drain • Oversize main condensate line if combining multiple traps

  23. Steam Line Installation Condensate Traps Atmospheric Steam • Full Size Tee Condensate Trap • Copper Tee • Minimum 6” drop to top of trap • Cap • Condensate Line • Minimum 6” or duct static pressure + 2”

  24. Steam Line Installation Condensate Traps Atmospheric Steam 2 3 1 • Where to install condensate traps: • 1. Long steam runs • Trap every 15 – 20 ft. • 2. Horizontal to vertical transitions • 3. Distributors below humidifier • Trap at low points and at distributor

  25. Steam Line Installation Horizontal to Vertical Transitions Atmospheric Steam

  26. Steam Line Installation Horizontal to Vertical Transitions Atmospheric Steam • Full Size Copper Tee • Condensate Drain

  27. Steam Line Installation Condensate Traps Atmospheric Steam Where would you use traps?

  28. Common Mistakes What’s wrong with this installation? Atmospheric Steam

  29. Common Mistakes What’s wrong with this installation? Atmospheric Steam

  30. Common Mistakes What’s wrong with this installation? Atmospheric Steam

  31. Review Atmospheric Steam • Atmospheric steam is NOT the same as pressure steam • Follow recommended materials, size and length • Insulate with 1” pipe insulation • Slope the steam lines • Min. 10° for upward slope • Min. 2° for downward slope • Trap condensate • Long steam runs - every 15 – 20 ft. • Horizontal to vertical transitions • Trap at low points and at distributor

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