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RBD’s simply don’t work well with electrical and HVAC systems.  RBD stands for Reliability Block Diagram and they are used to model really complex systems for which you can’t do a calculation.  Before Analyst Enterprise was available I used RBDs extensively and found that you had to make so many simplifying assumptions you were never really sure how valid your final model was.  To make matters worse, a block diagram (RBD) seldom looks anything like the system you’re trying to model.  But… what if you could build a reliability model by simply drawing a familiar single-line diagram of the electrical or HVAC system?


Analyst Enterprise does just that.  Equipped with a library of familiar electrical and HVAC components, you simply draw a one-line diagram.  To test and verify your model, you watch it working while interacting with it visually.  When you’re satisfied the model does what you want and has the appropriate failure data, a reliability estimate is only a mouse click away.

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b2ap3_thumbnail_Lead-Acid-Battery-Datacenter.jpgGlobally, Telco margins are being squeezed and everyone’s looking for cost savings.  For every $US30 billion of revenue, you are likely to need up to $US1 billion dollars of battery assets to support that network.  As most Telcos use valve-regulated lead-acid batteries, they will need to be completely replaced every 7-10 years.  In addition to cost, there is also the harmful effects of lead on the environment to consider.  Finally, telecommunications networks have evolved considerably.  The point to point physical switching circuits that demanded high reliability are rapidly being phased out.  These are three of many reasons why reducing the amount of batteries makes good sense.

The billion dollar question is: how to achieve that without unduly impacting the legendary reliability we have come to expect from Telco networks?

The answer lies in plausibly modeling the reliability of your existing battery system  with quality data that inspires confidence in all areas of the business. Until now, this has been a task not easily accomplished.


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A data centre outage can be a stressful experience for all concerned particularly if you’re the mission commander. It isn’t surprising that patrons of critical facilities are very coy about the circumstances surrounding an outage.  It is plausible that this sentiment has led to an absence of truly representative failure rate data throughout the industry.   I exchanged some correspondence with Ken Brill, founder of the Uptime Institute when he attended a conference in Australia a few years ago and he told me that a lack of failure data within the industry was a significant problem.

What is good system or module-level failure rate data and how do you get it?  Data  that has been taken from the field is always the most valued. Such field data  should be accurately recorded by an independent professional or body.


So how do you get data of this standard that relates to your specific application?  The simple answer is its generally not available.  When people ask for accredited data (e.g. IEEE Gold Book), they mean a professional body who are widely considered credible.  This however says nothing about how the data applies to your particular industry.  Although, on the plus side if you use that data in an A-B comparison, you are using the same basis as someone else doing the equivalent comparison.  When software packages quote accredited sources of data such as Bellcore/Telcordia (SR-332), FIDES, MIL-HDBK-271F, NSWC-07, these are aimed at component-level problems where you would like to build an estimate of product reliability at the design stage.  They are of little use in system-level studies.

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Analyst Powertechnic Power Reliability HVAC

We wouldn’t for a moment suggest there’s a lack of awareness of the vital role HVAC plays in the reliability of mission critical systems.  However traditionally, there has been a real struggle as to how to  model HVAC alongside a power system in a way that is easily understood.

Next generation Analyst Enterprise software removes the  difficulty around designing and testing even the most complex power and HVAC systems, all via a simple, one-line diagram.


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In this brief 5:34 video, we introduce you to the advanced reliability modelling possible in the Analyst Enterprise Software - all from a one-line diagram.  The one-line diagram is the actual reliability model and is referred to as a Single Line Reliability Diagram or SLRD.

Video Demonstration

To download your full working 30 day free trial of Analyst Enterprise, please click on the link below.

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