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Lalith Ramachandra

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  • in reply to: Humidity/Condensation #76072
    Lalith Ramachandra
    Participant

    Author:
    Lalith Ramachandra

    Email:
    lalith.ramachandra@GMAIL.COM

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    Hello Teresa

    Generally an A/C system or a heating system is designed with regard to the
    maximum and minimum ambient conditions, specially if you require
    ventilation in excess of the AS1668.2. This is particularly the case for
    OTs and sterile stores where a positive pressure is required relative to
    the surrounding areas i.e. a higher outdoor air is required for room
    pressurisation.

    In Darwin. where I live, the ambient relative humidity level rarely drops
    below 40% so we don’t have a low RH issue. Our issues are at the other end!

    But in southern areas the RH level is generally maintained using a steam
    injector (using central steam or local electric unit) into the A/C duct.
    Water atomisation units are rarely used these days because of Legionella
    issues. Probably best not to inject directly into the room as this would
    then be by-passing the terminal HEPA filters.

    I’m not sure if sterility is affected at 21% but below 40% RH, static
    electricity generation may become an issue.

    Your 21% RH at 22degC corresponds to a very low moisture content about
    3.5gm/kg of dry air with a dew point of 0degC, and to get to, say, 40% RH
    (at that temp) the air requires about 6.5gm of water vapour per kg of air,
    so you do need to provide humidification (add moisture).

    Regards

    Lalith Ramachandra
    LR Consulting Engineers
    for Top End Health Services
    PO Box 40968
    Casuarina, NT
    p 0401117423
    e lalith.ramachandra@gmail.com

    * To Spot the Expert, Pick the One Who Predicts the Job Will Take the
    Longest and Cost the Most!*

    On Tue, 3 Dec 2019 at 10:24, Teresa Lewis wrote:

    > Hi All
    > Further to this:
    > What does one do if the relative humidity is lower than 35%?
    > Our readings can go as low as 21% with a temperature of 22 degrees for
    > example. Its all well and good to monitor but what action needs to be
    > taken to make correction so that the relative humidity is kept between
    > 35-70%?
    > Thank you for your help, if anyone is able to.
    > Teresa Lewis
    > Newcastle Endoscopy Centre
    >
    > Sent from my iPhone
    >
    > On 28 Nov 2019, at 8:13 pm, Terry wrote:
    >
    >
    >
    > Hi Everyone,
    >
    >
    >
    > Thanks to the responders that have pointed out that dew point is also an
    > important factor in ensuring that sterile packs are not compromised by the
    > presence of moisture, that if present, allows wicking of the microbes;
    > thanks also to the person sharing of the Canadian guidance on humidity in
    > sterile stores, along with thanks to the person that drew attention to the
    > iteration of the storage requirements in terms of temperature and humidity
    > in AS/NZS4187:2014.
    >
    >
    >
    > I also should mention that there are commercially sterilised products that
    > have temperature and humidity exposure limits that are significantly less
    > than the parameters mentioned in AS/NZS41897:2014. In these cases, you need
    > to review also the storage limitations of your commercially produced
    > sterile products as there are some that cannot withstand a humidity range
    > in excess of 60% without compromise to the adhesives used to seal the
    > products. Similarly, there are products that can withstand exposure to
    > temperature and humidity parameters significantly in excess of those stated
    > in AS/NZS4187:2014.
    >
    >
    >
    > In other words, please review the stored products on a product by product
    > basis in terms of the conditions that they can withstand as some may need
    > to be discarded if temperature or humidity exceeded the maximum parameter.
    >
    > *Kind Regards*
    >
    > *Terry McAuley*
    >
    > *Director*
    >
    > *MSc Medical Device Decontamination *
    >
    >
    >
    > *PO BOX 2249, Greenvale, VIC Australia 3059*
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    > *From:* ACIPC Infexion Connexion *On Behalf Of *Kristin
    > Ryan-Agnew (Northern NSW LHD)
    > *Sent:* Thursday, November 28, 2019 8:39 AM
    > *To:* ACIPCLIST@ACIPC.ORG.AU
    > *Subject:* [ACIPC_Infexion_Connexion] Humidity/Condensation
    >
    >
    >
    >
    >
    > Dear colleagues,
    >
    > At what level of humidity and over what time frame would it take for
    > condensation to form in a sterile storeroom where temperatures have
    > fluctuated between 19 and 26 degrees over a 24 hour period and humidity has
    > peaked at 90%?
    >
    > Reason being, we have been advised that sterile stock is uncompromised at
    > 26 degrees unless condensation has formed causing the trays to become damp.
    >
    > Thanks for your assistance.
    >
    > Kind regards
    >
    > Kristin
    >
    > *Kristin Ryan-Agnew*
    >
    > *Kristin Ryan-Agnew (MPH/Grad Cert IP&C)*
    >
    > *Infection Prevention & Control Clinical Nurse Consultant*
    >
    > *The Tweed Hospital*
    >
    > *Ph: 0755067406*
    >
    > *Mobile: 0427112213*
    >
    >
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    in reply to: Humidity/Condensation #76059
    Lalith Ramachandra
    Participant

    Author:
    Lalith Ramachandra

    Email:
    lalith.ramachandra@GMAIL.COM

    Organisation:

    State:

    G’day

    Dampening is a result of condensation!

    At 19degC dry bulb and 50% room relative humidity, the air dew point is
    9degC so no condensation. If the conditions then change quickly to 20degC
    and 60%RH then the new dew point is 12degC. And if the sterile barrier is
    still at 19degC – no condensation as its above the dew point of the air.

    If the conditions then change quickly to 24degC and 80%RH, the dew point is
    21degC. So if the sterile barrier is still at 19degC or just above, say,
    there will be condensation as the dew point is above this temperature.

    If your room is served by an air handling unit and the compressor suddenly
    stops (or the chilled water valve shuts) and the fan continues to run, your
    room temperature and RH can increase within 30seconds as the air change
    rate for sterile stock rooms is 15ch/hr. This will cause condensation on
    any surface which is below the new dew point temperature.

    Hope this helps.

    Cheers

    Lalith Ramachandra
    LR Consulting Engineers
    for Top End Health Services
    PO Box 40968
    Casuarina, NT
    p 0401117423
    e lalith.ramachandra@gmail.com

    * To Spot the Expert, Pick the One Who Predicts the Job Will Take the
    Longest and Cost the Most!*

    On Thu, 28 Nov 2019 at 08:27, Louise Christine Grant
    wrote:

    > Dear Kirsten,
    >
    > AS4187:2014 says somewhere (sorry cant find specific section a the moment)
    > that the acceptable range for relative humidity for a sterile store room is
    > 35 to 70%, with an acceptable temperature range of 18 to 250C. There does
    > not have to be condensation on the items for them to be affected by an
    > increase in humidity. If the packaging gets damp then the bugs on the
    > outside can wick through and contaminate the contents. So Id say with the
    > humidity going that high the sterility has been compromised.
    >
    > It has recently happened in our sterile storeroom when the air
    > conditioning stopped working in the specific room where the orthopaedic
    > trays are stored. The humidity in the room was elevated and the filter
    > papers on the orthopaedic trays had dampened despite the outer metal
    > containers not having condensation on them. So all the orthopaedic trays
    > had to be resterilised.
    >
    >
    >
    >
    >
    > Regards
    >
    >
    >
    > Louise Grant PhD Cand, MCl Sc(Periop)
    >
    > Project Consultant Reprocessing Compliance
    >
    > Top End Health Service | Northern Territory Government
    >
    > Room 221, Building 4, Royal Darwin Hospital,
    >
    > Rocklands Drive, Tiwi NT 0810 | PO Box 41326 Casuarina NT 0811
    >
    > t 08 8944 8005 | m 0404 491 183 | e *Louise.Grant@nt.gov.au
    > * | http://www.health.nt.gov.au
    >
    >
    >
    > *TEHS Vision:* *Building Better Care | Better Health | Better
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    >
    >
    > *From:* ACIPC Infexion Connexion *On Behalf Of *Kristin
    > Ryan-Agnew (Northern NSW LHD)
    > *Sent:* Thursday, 28 November 2019 7:09 AM
    > *To:* ACIPCLIST@ACIPC.ORG.AU
    > *Subject:* [ACIPC_Infexion_Connexion] Humidity/Condensation
    >
    >
    >
    >
    >
    > Dear colleagues,
    >
    > At what level of humidity and over what time frame would it take for
    > condensation to form in a sterile storeroom where temperatures have
    > fluctuated between 19 and 26 degrees over a 24 hour period and humidity has
    > peaked at 90%?
    >
    > Reason being, we have been advised that sterile stock is uncompromised at
    > 26 degrees unless condensation has formed causing the trays to become damp.
    >
    > Thanks for your assistance.
    >
    > Kind regards
    >
    > Kristin
    >
    > *Kristin Ryan-Agnew*
    >
    > *Kristin Ryan-Agnew (MPH/Grad Cert IP&C)*
    >
    > *Infection Prevention & Control Clinical Nurse Consultant*
    >
    > *The Tweed Hospital*
    >
    > *Ph: 0755067406*
    >
    > *Mobile: 0427112213*
    >
    >
    >
    > [image: cid:image001.png@01D36E89.D6B88C30] *National Standard 3 :
    > Preventing and Controlling Healthcare Associated Infections*
    >
    >
    >
    > [image: Description: Description: Description: Description:
    > cid:image001.png@01CC899A.70FE88C0]
    >
    > I acknowledge the Bundjalung people as traditional owners of the land on
    > which I work and live.
    >
    > ‘Bulla Yana Yabur’ Standing Together As One
    >
    >
    >
    >
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    in reply to: Upgrade of Clinical Hand wash basins #76048
    Lalith Ramachandra
    Participant

    Author:
    Lalith Ramachandra

    Email:
    lalith.ramachandra@GMAIL.COM

    Organisation:

    State:

    Hello

    Does the AHFG provide any advice on the use of aerators?

    Thank you

    Regards

    Lalith Ramachandra

    Sent from LR Consulting Engineers

    > On 22 Nov 2019, at 9:03 am, De Sousa, Fiona M wrote:
    >
    >
    > Hi all,
    >
    > Following a recent audit we identified a number of clinical hand wash basins that did not conform to the Australasian Health Facility Guidelines. Examples of non-compliance include poor tap spout positioning, bench set basins, overflow holes, inappropriate sink size.
    >
    > My recommendation is that these basins be upgraded to comply with the AHFG as a priority. However I have had responses that that this does not need to occur until the areas are refurbished. Where areas are being refurbished in the next few months I agree with this. However some areas are not likely to be refurbished for many years. I would like to know what others would advise for the clinical handwash basins for these areas.
    >
    > Kind regards,
    >
    > Fiona De Sousa CICP-E| Nurse Manager | Infection Prevention & Control Unit
    > Launceston General Hospital, Level 2, Launceston TAS 7250
    > phone: 6777 6715 | mobile: 0408 487 197 | fax: 6777 5170 | email: fiona.de.sousa@ths.tas.gov.au |
    > intranet: http://www.dhhs.tas.gov.au/intranet/thon/infection_control
    >
    > IPCU By working together we promote a culture of safety to reduce preventable infections and transmission of multi-resistant organisms
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    in reply to: Washing machine – internal disinfection #75882
    Lalith Ramachandra
    Participant

    Author:
    Lalith Ramachandra

    Email:
    lalith.ramachandra@GMAIL.COM

    Organisation:

    State:

    Hello Pam

    Is this for a domestic type washer located in a ward or the commercial
    washer/extractor in the laundry?

    Cheers

    Lalith Ramachandra
    LR Consulting Engineers
    for Top End Health Services
    PO Box 40968
    Casuarina, NT
    p 0401117423
    e lalith.ramachandra@gmail.com

    * To Spot the Expert, Pick the One Who Predicts the Job Will Take the
    Longest and Cost the Most!*

    On Wed, 9 Oct 2019 at 11:44, Pamela Ann Boon wrote:

    > Good morning everyone.
    >
    > Does anyone have any opinion on the necessity of disinfecting washing
    > machine internal components?
    >
    >
    >
    > I have been advised to run a wash cycle containing disinfectant every week
    > in order for the internal bowl and piping to be decontaminated.
    >
    >
    >
    > The Codes of Practice for Public Healthcare Operated Laundries and
    > Linen Services have been quoted as suggesting this however I cannot find
    > this recommendation within them.
    >
    > Any advice is appreciated.
    >
    >
    >
    > Kind regards
    >
    > Pam
    >
    >
    >
    > *Pamela Boon | *Clinical Nurse
    > Manager
    >
    > Infection Prevention and Management Unit
    >
    > Royal Darwin Palmerston Hospitals | Top End Health Service
    >
    >
    >
    > Northern Territory Government
    >
    > LG Floor, Royal Darwin Hospital, Rocklands Drive, Tiwi
    >
    > GPO Box 41326, Casuarina, NT 0811
    >
    >
    >
    > *p …**08 892 28045 *
    >
    > *f …* *08 892 28889*
    >
    > *e … *
    > *Pamela.Boon@nt.gov.au **w **www.nt.gov.au/health
    > *
    >
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    in reply to: Split system air conditioners #75860
    Lalith Ramachandra
    Participant

    Author:
    Lalith Ramachandra

    Email:
    lalith.ramachandra@GMAIL.COM

    Organisation:

    State:

    Hello Kris

    The AIRAH maintenance standard, DA19, advices that monthly maintenance
    should be carried out on domestic type split systems and the filters
    cleaned or replaced every 6 months. These types of filters are really not
    filters as such but a mesh to catch large dust particles.

    I’m no IC expert, but droplet (>5microns) travel distance is around 1m or
    so, I think, so could potentially contaminate the evaporator surface, but
    unless someone touches it, there’s unlikely to be any transmission to the
    person. So, monthly cleaning would be good but maybe slightly over cautious.

    But as these types of split system have no provision for fresh air, any air
    borne bacteria can be recirculated within the room for some time.

    Cheers

    Lalith Ramachandra
    LR Consulting Engineers (Mechanical Services)
    for Top End Health Services
    PO Box 40968
    Casuarina, NT
    p 0401117423
    e lalith.ramachandra@gmail.com

    * To Spot the Expert, Pick the One Who Predicts the Job Will Take the
    Longest and Cost the Most!*

    On Tue, 1 Oct 2019 at 09:40, Kristine Ellen-Stewart (Hunter New England
    LHD) wrote:

    > Hello Everyone,
    >
    >
    >
    > I am an IC Coordinator working in a rural hospital in NSW.
    >
    >
    >
    > We have split system air conditioners in all our patient rooms, including
    > single rooms.
    >
    >
    >
    > Currently , the cleaning of these air conditioners is done 2nd monthly by
    > an outside contractor.
    >
    >
    >
    > As these air conditioners are part of single rooms used for droplet
    > precautions, sometimes airborne ( nebulised antibiotics), should the
    > cleaning be increased to monthly? Cleaned after each patient is discharged
    > who has been on precautions?
    >
    >
    >
    > Can you please advise and assist?
    >
    >
    >
    > Many thanks
    >
    >
    >
    > Kris
    >
    >
    > This message is intended for the addressee named and may contain
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    >
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