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Can anyone clarify about the 10% rule of Preventive Maintenance. If it is 30 days PM then total 3 days on either side are allowed or 1.5 days on either side.. means can PM be performed between 27 to 33 days or 28.5 days to 31.5 days??

30 days is shorthand for 12 Periodic Maintenance checks per year, so the baseline is actually 30.42 days; plus 10% = 33.46 days, minus 10% = 27.38 days.  That said, Periodic Maintenance is valuable in that it catches some issues before they become more expensive and disruptive, but only occasionally.  Without a focus of what is critical, and what fails in these critical areas along with why and when, much of your time and money will be spent with less benefit than it could be.

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Jeff Beukema
TEGG Service Consultant
Transworld Inc. Electrical Contractors
Charleston SC
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Original Message:
Sent: 07-29-2022 11:29 AM
From: Vikas Lodha
Subject: Preventive Maintenance

Can anyone clarify about the 10% rule of Preventive Maintenance. If it is 30 days PM then total 3 days on either side are allowed or 1.5 days on either side.. means can PM be performed between 27 to 33 days or 28.5 days to 31.5 days??

Original Message:
Sent: 7/29/2022 11:29:00 AM
From: Vikas Lodha
Subject: Preventive Maintenance

Can anyone clarify about the 10% rule of Preventive Maintenance. If it is 30 days PM then total 3 days on either side are allowed or 1.5 days on either side.. means can PM be performed between 27 to 33 days or 28.5 days to 31.5 days??

Hi Vikas, 

In terms of reliability, strategy etc... I'm cannot help you because it depends of several factors, but regarding the metrics itself, this rule is usually applied to measure the Indicator "PM Compliance", which gives +/- 10% of tolerance within the PM cycle, In your cause it'd be +/- 3 days.

In other words, you can manage carry out the PM within this range [27-33 days].

Regards,

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Rodrigo Ribeiro
Mr
Anglogold Ashanti
Belo Horizonte
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Original Message:
Sent: 07-29-2022 11:29 AM
From: Vikas Lodha
Subject: Preventive Maintenance

Can anyone clarify about the 10% rule of Preventive Maintenance. If it is 30 days PM then total 3 days on either side are allowed or 1.5 days on either side.. means can PM be performed between 27 to 33 days or 28.5 days to 31.5 days??

The 10% rule for completing preventative maintenance work says that he work should be completed  within the 10% of the interval on either side of the due date.  So 3 Days before and 3 Days after still allows the completion of the PM to be in compliance with the strategy.

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Michael Raible CMRP, CRE
Associate Reliability Engineer
Eastman Chemical Co.
Kingsport TN
http://www.eastman.com
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Original Message:
Sent: 07-29-2022 11:29 AM
From: Vikas Lodha
Subject: Preventive Maintenance

Can anyone clarify about the 10% rule of Preventive Maintenance. If it is 30 days PM then total 3 days on either side are allowed or 1.5 days on either side.. means can PM be performed between 27 to 33 days or 28.5 days to 31.5 days??

You are correct in your understanding of the 10% rule.  The answer is what does the company want the 10% rule to be. Some camps believe 10% rule is (in your example), starting the PM 3 days early or after 3 days after the actual scheduled date.  Other camps believe it should be 1 1/2 days early or 1 1/2 days late.  Either way you meet the 10% rule based on your company's understanding and interpretation.

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Andrew Gager CAMA, CMRP, CPIM, CRL, CSSGB
CEO / President
Wake Forest NC
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Original Message:
Sent: 08-01-2022 08:05 PM
From: Michael Raible
Subject: Preventive Maintenance

The 10% rule for completing preventative maintenance work says that he work should be completed  within the 10% of the interval on either side of the due date.  So 3 Days before and 3 Days after still allows the completion of the PM to be in compliance with the strategy.

------------------------------
Michael Raible CMRP, CRE
Associate Reliability Engineer
Eastman Chemical Co.
Kingsport TN
http://www.eastman.com

Original Message:
Sent: 07-29-2022 11:29 AM
From: Vikas Lodha
Subject: Preventive Maintenance

Can anyone clarify about the 10% rule of Preventive Maintenance. If it is 30 days PM then total 3 days on either side are allowed or 1.5 days on either side.. means can PM be performed between 27 to 33 days or 28.5 days to 31.5 days??

Hi Vikas, as Andrew already mentioned this is really up to you how you define your implementation of the 10% rule as it is not a hard and fast rule, just a good practice. My recommendation would be not to be too fussed about whether it is +/- 3 days or +/- 1.5 days. Choose something that is supported and practical for your organization and make sure that you keep in mind:

- any regulatory considerations i.e. is it OK to do regulatory PMs 'late' compared to your schedule date? that might depend on the regulator, your company policies and whether your scheduled date takes into account the 'float' your allowing

- what you do with PMs on extended frequencies e.g. Pms on a 4 yearly interval, that is 1460 days (or 1440 if you use a 360 day calendar) and a +/- 10% allowance would allow doing the work 140 days early or late. I was never a big fan of that, so I always advocated a maximum +/- float of 30 days. That does mean you need to look ahead through a longterm schedule and move thosekind of PMs in your CMMS so they come out in the right period

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Erik Hupje
http://www.roadtoreliability.com
https://www.linkedin.com/in/erikhupje/
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Original Message:
Sent: 07-29-2022 11:29 AM
From: Vikas Lodha
Subject: Preventive Maintenance

Can anyone clarify about the 10% rule of Preventive Maintenance. If it is 30 days PM then total 3 days on either side are allowed or 1.5 days on either side.. means can PM be performed between 27 to 33 days or 28.5 days to 31.5 days??