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Anti-Evisceration Rings: Proof of Concept

[+] Author Affiliations
Ralph L. Barnett

Triodyne Inc., Glenview, IL

Paper No. IMECE2012-88131, pp. 1611-1622; 12 pages
  • ASME 2012 International Mechanical Engineering Congress and Exposition
  • Volume 3: Design, Materials and Manufacturing, Parts A, B, and C
  • Houston, Texas, USA, November 9–15, 2012
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4519-6
  • Copyright © 2012 by ASME


Domed suction entrapment covers (grates) are generally mounted on cylindrical sumps or frames (mud rings) that are permanently installed in the bottoms or sidewalls of swimming or wading pools. These covers constitute a first-line-of-defense against the danger of evisceration by preventing children from sealing the sumps and drains with their buttock. When the covers are missing, loose, or broken, sealing a sump with their backsides exposes their bowels to dangerous levels of suction that cause disembowelment in a fraction of a second. There is an emerging paradigm shift in the aquatic’s industry that calls for equivalent protection for covered and uncovered sumps and frames. Using a simple concept patented by Barnett (2001) [1], the planar circle formed by the inside edge of a sump is replaced by a non-planar edge, e.g., scalloped or castellated. Edge geometry is chosen that will not conform to human body parts to preclude sealing. Testing inexpensive prototypes demonstrated that the proposed anti-evisceration rings reduce the body removal force from 324 lb. to 10 to 17 lb. Further, they lower the maximum pump vacuum from −14.3 psi to −1 to −2 psi.

Copyright © 2012 by ASME



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