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July 2020

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Subject:
From:
David Kuchta <[log in to unmask]>
Reply To:
The Pharmaceutical Microbiology Forum Email List <[log in to unmask]>
Date:
Fri, 24 Jul 2020 13:27:52 +0000
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Good day,

Sometimes the important point to focus upon is the "Loss of Class and Positive Differential Air Pressure"  rather than only the loss of power. Some HVAC supply systems "wind down" slower than other. That gives operators time to contain and leave the area. Likewise, there is also a delay in the loss of Class 100 and 10,000 ( old school) classification . These may give you a 30 second delay to contain the area.

It is equally important to know how long it takes to return to the proper classification and differential air pressure after a power loss interruption. Most HVAC systems or SCADA systems can tell you the duration of the "power loss" interval. This timing fits into the control strategy that you can develop with understanding the other items I mentioned above.

Good luck on your quest for Environmental Control .

Kind regards,

Dave

-----Original Message-----
From: The Pharmaceutical Microbiology Forum Email List <[log in to unmask]> On Behalf Of Joel Russo
Sent: Friday, July 24, 2020 6:16 AM
To: [log in to unmask]
Subject: Re: [PMFLIST] Loss of Power in Aseptic Pharma. Plant

Randy, even a momentary loss of power could have an effect on air handling systems and other utilities that are not backed up properly by alternate power, that could adversely effect environmental conditions in your suite.

Kind Regards,
Joel Russo

> On Jul 24, 2020, at 12:09 AM, Randy Hutt, Ph.D. <[log in to unmask]> wrote:
>
> ´╗┐Does anyone have a time limit for loss of power (HVAC), after which
> you would do a 3X clean?  I was thinking 15 minutes, but some people
> thought 30 minutes would be acceptable.  Are there any guidance
> documents for this issue?
>
> Thanks.
> Randy Hutt, Ph.D.
>
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