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Investigating nitrous oxide leaks at St George Hospital: A case study using the discrepancy and pressure testing

Rebecca Cregan1, Kristen Pickles2, Philomena Colagiuri2

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Summary
This summary is machine-generated.

Significant nitrous oxide (N2O) leaks were found at St George Hospital, wasting 28% of procured gas. This highlights the need to address hospital infrastructure for climate and safety.

Keywords:
Nitrous oxideanaesthetic gasesanalgesiacarbon footprintglobal warminghealthcareoccupational exposure

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Area of Science:

  • Environmental Science
  • Occupational Health
  • Medical Gas Management

Background:

  • Nitrous oxide (N2O) is a potent greenhouse gas and ozone-depleting substance.
  • Wastage of medical gases, particularly N2O, from hospital infrastructure is a recognized issue.
  • Identifying and mitigating N2O leaks is a priority in Australia's health and climate strategies.

Purpose of the Study:

  • To investigate and quantify nitrous oxide (N2O) leaks within the pipeline infrastructure of St George Hospital.
  • To assess the extent of N2O wastage and its environmental and financial implications.
  • To identify specific locations of N2O leaks within the hospital's medical gas system.

Main Methods:

  • Utilized the discrepancy method to compare procured N2O volumes with estimated clinical usage.
  • Employed pressure testing techniques to detect leaks throughout the N2O pipeline system.
  • Calculated potential carbon emissions associated with procured and leaked N2O.

Main Results:

  • An estimated 28% (319,534 litres) of procured N2O was unaccounted for, indicating significant leaks.
  • Leaks were identified in the pipeline system supplying operating theatres and the delivery suite.
  • Pressure testing confirmed leaks in three operating theatres within the hospital.

Conclusions:

  • A substantial volume of N2O is leaking from St George Hospital's infrastructure, leading to unnecessary environmental emissions.
  • These leaks represent financial losses and potential occupational exposure risks for clinicians.
  • Addressing leaks in hospital N2O infrastructure is crucial for environmental sustainability and healthcare safety.