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Laboratory determination of hazardous R40 concentration in HFC-134a systems, application to intermodal container refrigeration and pacification technique.

Number: pap. n. 805

Author(s) : LAWTON A. R., CLARKE P.

Summary

Results of extensive testing of HFC-134a and R40 (chloromethane) mixtures and their reaction with aluminium are presented. The interaction of R40 with aluminium is of particular interest as it can cause the formation of trimethyl aluminium, a pyrophoric chemical which can place service technicians at risk. Investigation of the chemical processes is provided along with a pacification process of a system that has reacted after being contaminated with R40. The reaction mechanism in in-service refrigeration systems is explored and the application of laboratory observations is provided. Results have shown that the reaction is difficult to trigger and it is likely that likely that 35% of a standard charge size substituted by chloromethane is needed to consume all of the oil and, in the absence of moisture, allow a pyrophoric reaction to take place. Pacification is achieved using isopropyl alcohol which allows the system to be safely decommissioned by technicians.

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Pages: 8

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Details

  • Original title: Laboratory determination of hazardous R40 concentration in HFC-134a systems, application to intermodal container refrigeration and pacification technique.
  • Record ID : 30026213
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0805

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