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Anonymous Poster #1

HEPA Filters

02/05/2017 10:58 PM

Hi

I need information regarding the health check of HEPA filters , is there mechanism to monitor online the condition of HEPA filters.

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#1

Re: HEPA filters

02/05/2017 11:14 PM

ΔP, for one possibility.

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#3
In reply to #1

Re: HEPA filters

02/06/2017 12:17 AM

Thanks for your inputs , is there any agency who is doing it in clean room applications

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#4
In reply to #3

Re: HEPA filters

02/06/2017 1:06 AM

That would depend on where you are, as to whether any agencies are governing this.

My comment on ΔP was generic, of course. High ΔP would indicate filter clogging. Low ΔP could mean rips or tears in the filter, or a leak bypassing it. Any such conditions should be investigated and corrected. In addition, it may be advised to monitor the downstream fluid for any unwanted substances.

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#5
In reply to #3

Re: HEPA filters

02/06/2017 3:13 AM

There are instruments doing it in clean room and other applications.

What happens to the information that the instrument is able to produce depends on the contents of a number of documents at the facility and relating to the installation, such as:

  • User Requirement Specification
  • Process Description
  • Control Philosophy
  • Functional Design Specification

none of which can be seen from here.

Whether what is done with the information is carried out in-house or by some agency is a local management decision, not a global Engineering one, and therefore falls outside the scope of CR4.

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#2

Re: HEPA filters

02/05/2017 11:34 PM

The monitoring of filters depends on the application and nature of the parameters...

http://www.tsi.com/Facility-Monitoring-System/

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#6

Re: HEPA Filters

02/06/2017 3:43 PM

1) If you are working on asbestos abatement: The filter integrity must be (by law) 100%.

2) If not working asbestos, such as clean room: The room will have particle monitoring that will produce alarm conditions when there is an issue with filter "health".

3) If working on some celestial body other than Earth. No filter seemingly is good at removing all the jaggedy, angular particles encountered on the moon. I presume vaguely similar dusts exist on Mars and elsewhere.

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#7

Re: HEPA Filters

02/06/2017 5:33 PM

There are many ways.

The easiest way for non-technical people would be to go to your HEPA filtration supplier and ask them.

They will (hopefully) know something about your application, which is more that you have provided here. They may be aware of any prefiltration you may do, again, we do not.

Does this look familiar? It may be this is all you need if Tornado has inspired you.

Get some technical help!

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#8

Re: HEPA Filters

02/06/2017 10:59 PM

I was going to post a comment, but I missed the part in the question that said the HEPA filter was going to be used in a Clean Room.

For all I know, it might have been a HEPA filter in a vacuum.

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#9
In reply to #8

Re: HEPA Filters

02/06/2017 11:13 PM

If so, then there would be nothing to worry about.

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#10

Re: HEPA Filters

02/08/2017 9:31 AM

define what you mean by HEPA, filter, and online.

If you meant to use your computer to track filter health, I suggest using a cellphone calendar app to set up the next filter change out date.

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#11
In reply to #10

Re: HEPA Filters

02/10/2017 8:59 AM

Have used a company called Agape for annual HEPA testing in the past. I think they were purchased by a company called Steris recently.

They travel all over US and are very good at what they do. I believe they also do smoke studies and velocity mapping in addition to the standard HEPA tests. We will have a team of their technicians on site for the next two weeks testing filters.

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