SELECTING CORRECT VENTILATION SYSTEM

This article reviews the factors involved in selecting a tunnel ventilation system and discusses the types of ventilation which may be used. Three basic facts to remember when designing a ventilation system are pointed out: there must be sufficient open area (A) in the tunnel to allow air to pass; there must be sufficient fresh air volume (Q) to dilute contaminants and furnish oxygen to men and equipment; and there must be enough air velocity (V) to move the contaminants out and have a cooling action (Q equals VA). There are essentially three types of ventilation which may be used, with minor variations: (1) "blow", a system in which a continuous positive pressure in the duct force air through the duct, across the tunnel face and out the portal; (2) "exhaust", a process in which there is a continuous negative pressure in the duct bringing in the air through the tunnel and removing it to the outside through the duct; and (3) use of a main outside fan and line brattice, which is essentially a long curtain dividing the tunnel so that intake air is brought up to the face on one side and returned down the other. The remainder of this article discusses the quantity of air required for any given tunnel, equipment selection, and fan characteristics. In conclusion, some general tips on tunnel ventilation are offered.

  • Corporate Authors:

    Westamerica Publication

    609 Mission Street
    San Francisco, CA  United States  94105
  • Authors:
    • Marshall, L K
  • Publication Date: 1975-8

Media Info

  • Features: Figures;
  • Pagination: 4 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00125008
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 18 1975 12:00AM