Frequently Asked Questions
Preventance is now using a continuous deployment schedule.
New deployments detailed below:
Code Deployment 04/16/2017
Printable Reports are now available!
Code Deployment 03/18/2017
The Economic Input tab is reorganized to provide a better grouping of related parameters.
Economic input parameters have been modified so that a different input, “Average CM Man Hours”, replaces Plan Time and Man Loading. This new format provides a more direct and accurate way to relate to plant data. The associated “Average CM Hardware Cost” input in this new format is the same quantity as the prior “Average CM Stores Cost”, which is still available in what is now referred to as the Alternative Format. Legacy analyses using the prior Plan Time and Man Loading parameters can still be run and edited by using the “Use Alternative Format” button. The on-button checkbox shows which option is being used.
A second, additional, economic input, “Average duration that equipment is unavailable during a failure and repair” enables equipment downtime caused by CM to be input directly and decoupled from other inputs, thus providing a simple and more accurate way to handle tech. spec. and related issues. This new parameter is ignored if the Alternative Format using Plan Time and Man Loading is being used.
On the Cost Benefit tab, Direct Failure and Repair Costs are now referred to as Direct CM Costs.
On the Cost Benefit tab, PM and CM Direct Costs are broken out into their Labor and Hardware (Stores) components. The four values are summed in two ways: 1) to Total Direct Labor Cost and Total Direct Hardware Cost, 2) to the prior Total PM Direct Cost and Total CM Direct Cost (formerly labelled Direct Failure and Repair Costs), and 3) the combined totals are provided as before.
On the Cost Benefit tab, Plant Unavailable Hours is replaced by Component Unavailable Hours, still showing PM and CM sources of the hours separately. The economic impact of plant unavailable hours is already included explicitly in a separate section of the Cost Benefit results.
On the Cost Benefit tab, a button now appears on the header bar to enable toggling between the prior “per component” results and “per N component results” in which N is the number of components to which the same analysis applies. N is a new input in the “Additional Costs” section of the Economic Input tab. The number of components input is also shown on the Component Details Summary panel. Toggling to results for N components only affects costs, benefits, and component unavailable hours displayed on the Cost Benefit tab. All other results on that and other tabs remain per component.
A report will very soon be available to print or save, which will include all the analysis input data and results. The short delay in adding the report is to enable inclusion of the items shown above.
Data Release 21 Deployed 02/01/17 -
click for details
Code Deployment 12/15/2016
Cost models have had manning levels modified slightly to ensure they are a good match to nuclear plant usage.
Some remaining questions regarding application of the Functional Failure Mode Options have been resolved, resulting in a few percent shift in failure rates.
3. The RCM Flags criteria have been modified, 1) to reduce the risk threshold before flagging, and 2) to remove dependence on the Baseline Strategy. The criteria are now based entirely on the quality of mitigation in the Custom Strategy alone, and remain faithful to the RCM approach. The new criteria are:
No Flag on a degraded state if its Custom Attenuation >=10
Flag a degraded state if: Its Custom Attenuation <10 AND Its Contribution to the Custom Failure Rate is >15%
To be more accurate for our nuclear power customers, Deferral Calculations now uses the Functional Failure Mode Option that was used in the underlying strategy analysis, and not the Conservative Option as previously stated in the training videos.
We are very conscious that our licensees need a stable code base. During the recent 3 month period of rapid evolution to accommodate functional failure modes, including our continuing efforts to improve accuracy, we have assumed that relatively minor changes in calculated reliability and cost would not unduly inconvenience our customers. Apart from forthcoming improvements to the user interface and isolated improvements to data, we anticipate that the code will now remain stable for an indefinite period. However, we remain sensitive to your concerns in this matter. Do not hesitate to contact us if you have comments or questions about our policy going forward.
Bug Fix 11/10/2016:
We have experienced a problem over the past week that caused reporting of some of the cost results for the Realistic and Optimistic FFM options to be in error. The problem has now been fixed and we apologize for the inconvenience it may have caused you.
Data Release Deployed 07/08/16 -
click for details
The three Functional Failure Mode (FFM) Options were modified to be more useful and renamed to be more understandable. They are now called Conservative, Realistic, and Optimistic. A bug that affected Direct Failure Repair costs for some of the former options was corrected.
The Ranked Task Action Items tab now lists the Functional Failure Mode values assigned to each failure mechanism, as edited by the user. This tab is now always available (except for the RTF strategy) and is the place where the action items can be edited as needing to be dropped from the task.
Ranked Task Actions can be exported as an Excel spreadsheet with one action per Excel record. The export file contains the Ranks, FFM Values, and user designations as to Dropped or Retained.
The Editable Task Content in Task Details no longer contains the run-time query list but retains the former text, if any, and permits additional edits to be made.
Component Groups can now be filtered on Group Type, so that PM groups and FEGs can be found separately.
The original Training Modules for Preventance Precision have been replaced by 6 new Modules on the Help Menu.
Task deferral calculations can be made as before, based on the Custom strategy, but will no longer report changes in costs and benefits due to the deferral.
To limit potential errors and be generally conservative, results in the tabs for Most Important Contributors, Ranked Task Action Items, Task Deferrals, and the Colored Rows in the Reliability Tab, are now always derived using the Conservative FFM option, which includes all FMEA mechanisms, regardless of the FFM option you use for strategy development.
Preventance now supports a 12 column PM Template where there is corresponding data in the ASL. Currently there is no such data except for one demonstration case, so you will not be able to use this capability right away. Going forward, APT personnel will progressively be optimizing the standard 8 strategies that exist in the ASL for most component types, using standard cost data. Because cost optimization differentiates between Critical A and Critical B there will be 12 resulting strategies for a standard component type instead of the original 8. The original 8 will remain and the 12 new, optimized strategies will be added. When they exist you will be able to select either the 8 column version or the 12 column version at the point on Tab 1 where you select the component type. The new optimized strategies will in general be much more cost effective than the original 8, especially for non-critical cases and may need no further optimization to be useful.
The 12 column Template will also support new labels for the functional importance. The current labels, Critical A, Critical B, and Minor will continue to be used for the 8 column Template. The new labels that correspond to these for the 8 col case will be Critical, Important, and Non-Critical, respectively.
The ability to set the age of a component on the Operating Context tab. This eliminates from analysis all wearout mechanisms that have earliest wearout times longer than this age.
Continued improvements to the save process for Component setup tabs.
Transparent validation of user edits to Task Intervals (avoids the error messages that were hard to see and prevented saving).
Improvements to the Task Deferral Tab format, making task selection clearer and retaining current status until user resets it.
Improved significant figures and decimal places in several numerical results.
Bug fixes (for Smart Import of plant data, Ranked Task Action Items (lockout warning reset), and also for Functional Importance Setup in Preventance Planned).
Task Deferral: Accurately assess the risk of deferring any combination of tasks for any number of task intervals or years.
Functional Failure Modes: Base your strategies on specific classes of functional failures.
Edit the FMEA:
Modify the functional failure assignment for any degraded states.
Modify the repair time assignment for any degraded states.
Dynamic Task Content: Task Content line items are now developed at run time and grouped by Functional Failure Mode.
Dynamic saving to improve performance. Users can do the entire setup for a component, saving only when convenient. The newly added save button will change to red when a save is required.
Validation of intervals input. Users will be notified if an invalid interval is input.
Compare/View/Optimize button removed. Users can now visit the “View/Develop Strategy” tab to optimize their PM intervals.
New “impact panel” under “PM Results”. For Precision users, there is a high-level impact panel to give quick comparison of various calc results. Optimizations are stored for comparison as well.
For Precision users, baseline and conservative optimization intervals are stored and displayed for reference.
For Precision users, under “Most Important Contributors” the failure location is now sortable.
The calculation/optimization routines have been changed to improve performance.
01/04/2016 - At APT we are beginning to develop a new capability for Preventance Precision to accurately calculate the effect of PM Task Deferrals. As a first step, this has required a new numerical solution to the ACE model engine in Preventance, which we have now uploaded to the public site. At the same time, we have taken advantage of this change to complete the renormalization of the ACE model to full functional failures for motors and pumps. As a result, in your current analyses, which are still for “all failures”, you may notice a decrease in MTBF and an increase in the cost of failures. However, the modification is important as it leaves the PM solutions themselves essentially unchanged and now we know that the full functional failure rates agree well with published data. Along with the future task deferral capability we anticipate another major advance requested by several customers: enabling the ASL functional failures to be calculated by users, including the ability for users to edit which failure modes result in different levels of failure. Users will also be able to edit out failure modes that may not apply to their specific equipment. We trust you will not be inconvenienced by the changes needed to make Preventance even more precise over the first quarter of 2016.
02/23/2016 - Preventance Data Update Release 18 deployed.
Click to view data release notes.
01/04/2016 - Preventance Data Update Release 17 deployed.
11/03/2015 - Functional Equipment Group data can now be exported.
11/03/2015 - Imported records now have no user ID assigned until a component type is selected in the component setup.
10/09/2015 - Preventance Data Release 16 now avaialble.
click here to view a PDF with full details.
10/12/2015 - We continuously strive to bring you the latest data and the most accurate results possible even though this requires inevitable changes from time to time. Enhancements to data on key components over the past two years have enabled “full functional failures” to be distinguished for the first time from “all failures” for those components. This has enabled the models and algorithms to be renormalized to improve agreement with published failure rates for all components. As a result, users may notice changes from previously calculated results. In our tests, these modifications have not produced significantly different PM solutions. Thus, even though failure rates and indirect costs have generally increased and MTBFs have decreased, PM intervals and PM costs have remained almost unchanged.
10/12/2015 - Added warning dialogues to component selection and deletion of Functional Equipment Groups.
10/12/2015 - New "Enhanced Stressor" added to list of stressors multiplying the effect of a stresssor.
09/16/2015 - Moved strategy details to right side of analysis/results in "Develop Strategies". Increased font size for better visibilty. Fixed bug with strategy details buttons.
08/25/2015 - Major Update to Preventance Deployed
Data Management - Administrators can now restrict the component datasets that will be available to analysts.
FAQs - Frequently asked questions are now available under the Help menu.
Functional Equipment Groups: The PM Groups menu item is now "Component Groups" where users can create and manage either PM Groups or the newly added Functional Equipment Groups.
A Functional Equipment Group (FEG) is a group made of components that have had their analysis completed. They only aspect they need have in common is that that the analyst wants to see their combined benefits and reliability, both of which are assumed to be additive (except for the FEG MTBF, which is 1/the FEG failure rate). You must be the owner of an analysis to add it to a FEG, but you can copy another analysis and so make the copy your own.
Help Tips - Quick tips are now available throughout the site, look for the
Bug fix - PM Intervals are now case insensitive
Strategies and Functional Equipment Groups now have "status" and the ability to set the status as "Benchmark" thereby locking them from edits. Items marked as "Benchmark" can be copied and subsequently edited by other users.
Task Prioritization - Preventance Precision users can now see the effect on the overall failure rate of removing low value task line-items. You can automatically remove them from Task Contents.
Advanced Spreadsheet Import - Analysts can now generate/edit/import an Excel spreadsheet for rapid data entry, including the ability to set all parameters for strategy development.
Warning notifications during strategy development have been moved to the top of the page.
Any user’s strategy can now be copied by anyone, whereupon it becomes the new owner’s analysis and can be edited accordingly. The original remains under the original owner’s control.
Printable pages - Pages have been adjusted to be more printer friendly for reporting. Use your Browser’s print function.
Strategy Results - Fully developed strategies now load to the results page immediately you navigate to an existing case; users can toggle back and forth between development and results.
Exported Data - Exported data has been enhanced by including only PM Tasks for which there are non-blank Custom intervals, by providing user friendly column headings, and by including units for Custom tasks.
Add New Component Dialog - the Add New Component dialog has been improved to be more user friendly.
You can now add previously non-existing PM Tasks during your analysis. These will be for information and completeness but will be ignored in any calculations of reliability, costs, or benefits. They will, of course be exportable.
The default filter when you first view the component list is to your own records at your product level in your login division. You can filter down by other criteris, e.g. Unit and System, or explore other anaysts work in other divisions of the company.
07/24/2015 - Preventance Data Release 15 now avaialble.
Data Release 15 is the 2nd official Data Release for Preventance.
Data Release 15 consists of 544 component data sets which include 31 entirely new data sets.
Data Release 15 is the first release where 11 previously released components have been removed.
These 11 components have been replaced by better differentiated versions that more accurately represent specific component types.
Download the Deployment Details
06/09/2015 - Updated "Terms of Service".
05/28/2015 - Added a single decimal place to percentages on the "Most Important Contributors" tab of the results page (for precision users only).
01/15/2015 - Enabled continuous deployment via Windows Azure integeration with "git".
Link to create a component fixed on Strategies page
Analysis defaults display whole number
Chart in analysis results for Precision users now starts at 0
0 interval in PM Intervals now saves as none.
Admin users can change the analyst of record on components.
SSL Implemented site wide
have been updated.
Econ data updates plant costs on carriage return (enter)
Removed “Reset to RTF” Button on functional importance
New accounts can be setup to have users in any of the three versions of Preventance.
Admin users can now create users for each of the three versions of Preventance on the same account.
Admin users can see the number of available licenses from the user admin page.
Strategies button now removed from the header, all strategies are accessed through the components page.
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