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Journal of Assisted Reproduction and Genetics

, Volume 36, Issue 11, pp 2271–2278 | Cite as

Cryostorage tank failures: temperature and volume loss over time after induced failure by removal of insulative vacuum

  • Kimball O. PomeroyEmail author
  • Michael L. Reed
  • Brian LoManto
  • Stanley G. Harris
  • W. Brent Hazelrigg
  • Dawn A. Kelk
Assisted Reproduction Technologies

Abstract

Purpose

To determine liquid nitrogen evaporation rates of intact liquid nitrogen storage tanks and tanks with their vacuum removed.

Methods

Donated storage tank performance (LN2 evaporation) was evaluated before and after induced vacuum failure. Vacuum of each tank was removed by drilling through the vacuum port. Temperature probes were placed 2 in. below the bottom of the styrofoam cap/plug, and tanks were weighed every 3 h. Evaporation rate and time from failure to the critical temperature was determined.

Result

Storage tanks with failed vacuum have a much higher evaporation rate than those with intact vacuum; evaporation rates increased dramatically within 3 to 6 h in the smaller tanks, and time to complete depletion varied according to starting LN2 volume. Tanks with storage racks/specimens may have altered evaporation profiles compared to tanks without. Locating temperature probes 2 in. below the styrofoam cap/plug suggests that for most applications, alarms would sound approximately 1 h prior to reaching the critical warming temperature, approximately − 130 °C. External signs of vacuum loss were dramatic: vapor, frost, and audible movement of air.

Conclusion

For the first time, we have data on how liquid nitrogen storage tanks behave when their vacuum is removed. These findings are conservative; each lab must consider starting volume, tank size/capacity, function (storage or shipping), age, and pre-existing evaporation behavior in order to develop an emergency response to critical tank failure. Times to complete failure/evaporation and critical warming temperature after vacuum loss are different; these data should be considered when evaluating tank alarm systems.

Keywords

Liquid nitrogen tank Vacuum failure Cryopreservation Cryostorage 

Notes

Acknowledgements

A special thanks to those that donated tanks to this study: The World Egg Bank, Colorado State University’s Animal Reproduction Laboratory, ReproTech, Ltd, Yale Fertility Center, and Kaiser Permanente Center for Reproductive Health.

Authors’ contribution

All authors contributed to the study conception and design and contributed to material preparation and data collection. All authors contributed to data analysis, with final review by KOP. All authors contributed to and had opportunity to comment on the original version of the manuscript.

Compliance with ethical standards

Conflict of interest

There were no conflicts of interest reported by the authors, and no compensation was received by the authors for participation in this project. No commercial, State or Federal funding was utilized in this study; materials, monitoring devices, and tanks were available in-house or were donated for the purposes described in this manuscript.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.The World Egg BankPhoenixUSA
  2. 2.Fertility Center of New MexicoAlbuquerqueUSA
  3. 3.Kaiser Permanente Center for Reproductive HealthFremontUSA
  4. 4.Repro Tech, Ltd.ColumbiaUSA
  5. 5.Yale Fertility CenterNew HavenUSA

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