SPECIALIST ENGINEERING
The endoscope ‘contaminated’ side.
). During design, the option of combining this supply from the existing surgical tool air plant was investigated, but this was deemed not suitable due to the capacity and purity requirement in excess of the existing plant capability and AS2896 considerations. The project provided three independent Altas Copco SF6 ‘oil-free’ clean air compressors, which were able to achieve the Cantel air purity requirements and maintain redundancy with a duty standby arrangement. Standards for the
quality. Dual systems were provided for improved redundancy, and to minimise service impacts during planned and unplanned maintenance. Clean air compressors: The reprocessing equipment required a supply of high purity compressed ‘Instrument Air’, with quality standards more stringent than that of medical breathing air covered under AS2568. The air quality was required to meet ISO 85731:2010 class 1.4.1, with a maximum particle size of one micron, dew point less than 3 °C, and be essentially oil free (acceptable limit 0.01 mg/m3
The endoscope ‘decontaminated’ side.
installation of the ‘Instrument Air’ pipework in hospital buildings are not included in Medical Gas Australian Standard AS2896, which had to be carefully managed with unique pipework labelling to avoid confusion with the concurrent medical gas installation. Commissioning air test sampling was completed via evacuated cylinders and NATA tested to AS 2896, and a manufacturer’s certificate provided to support the air purity requirements.
Engineering challenges
The project proved to have a variety of challenges and key learnings, particularly in relation to AS/NZS 4187 compliance,
which is a relatively recent update to include specific requirements for endoscopy departments. Among these challenges and learnings were: n The RO system design is crucial to achieving AS/NZS 4187 compliance. A water sample in the early stages of the design will allow RO manufacturers to customise system design to suit the water supply at the facility. This may include specific considerations to deal with the local silica content.
n System sanitisation is critical to prevent biofilm formation within the RO pipework. Sanitisation includes chemical and heat sanitisation not only through the RO ring mains, but also
A photo taken mid-construction showing carbon strapping structural supports.
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Advert.indd 7 Delivering Excellence as Standard 19/10/2020 10:35 November 2020 Health Estate Journal 21
HTM 03-01 Heat & Ventilation
Mechanical Pressure Systems
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