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  • two manholes in skirts?

    Discussion in 'The main mechanical design forum' started by Montana, Aug 23, 2011.

    1. Montana

      Montana New Member

      Aug 2011
      Likes Received:
      HI everyone.

      I have a question, and hope to receive your feedback-
      We have some pressure vessels with natural gas
      about 4 mts diameter and 6 meter height, elliptical heads
      these include skirts, about 20 mm in thickness.
      Normañlly we include a 24 " manhole in the skirt.

      Recently someone told us wúld be recommended to add a second manhole
      in the skirt as a security issue, For example for fast venting in case of
      a gas leak in the bottom of the vessel.

      what are your toughts

      Are there goverments, laws or regulations in USA, ASME API,etc
      which states something about this? more manholes?

    3. bkemper

      bkemper Member

      Mar 2010
      Likes Received:
      There are no rules against it in ASME BPVC other than placement (can't be too close together.) Having more than one is more of a process safety and maintenance issue. Whether its a "good idea" can be documented by an FMEA. If the manway is a safety device, then redundency may be needed.

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