Tag: production downtime

  • Pareto Charts for Downtime: Finding the Few Causes That Cost the Most

    Pareto Charts for Downtime: Finding the Few Causes That Cost the Most

    You Cannot Fix Everything at Once

    A production line stops for dozens of reasons. A plant that tries to work on all of them makes little progress on any. A plant that works on the loudest one, usually whatever went wrong yesterday, makes progress on the wrong thing. The Pareto chart is a simple tool for finding the few causes that account for most of the loss, so that limited engineering and maintenance time goes where it will return the most.

    This guide explains what a Pareto chart is, how to build one from the downtime data you already have, how to read it and the mistakes that make it misleading.

    What a Pareto Chart Is

    A Pareto chart is a bar chart in which the categories are sorted from largest to smallest, with a line added to show the running cumulative percentage. The bars show how much each cause contributes. The line shows how quickly the causes add up to the total.

    It is named after the Italian economist Vilfredo Pareto, who observed that a large share of wealth was held by a small share of the population. The quality pioneer Joseph Juran later applied the idea to manufacturing problems and described the vital few and the trivial many. The popular shorthand is the 80/20 rule: roughly 80 per cent of the effect comes from roughly 20 per cent of the causes. The ratio is not a law. The pattern, a steep drop from a few large causes to a long tail of small ones, turns up in most downtime data.

    Building One for Downtime

    Step one: collect the data. You need a list of stoppages over a period, each with a cause and a duration. A month of data is usually enough to start. It can come from a line monitoring system, a maintenance system or a shift log filled in by hand.

    Step two: group by cause. Give each stoppage a category. Use specific categories. Labeller jam is useful. Mechanical fault is not.

    Step three: total each category. Add up the minutes lost for each cause.

    Step four: sort. Put the largest first.

    Step five: calculate cumulative percentages. For each cause, work out its share of the total and add it to the shares above it.

    Step six: draw it. Bars for the minutes, a line for the cumulative percentage. Any spreadsheet will do this.

    A Worked Example

    A canning line lost 2,000 minutes to unplanned stops in a month. Sorted by cause, the losses were as follows.

    Labeller jams: 620 minutes, which is 31 per cent of the total. Filler valve faults: 480 minutes, 24 per cent, bringing the cumulative figure to 55 per cent. Changeover overruns: 410 minutes, 20.5 per cent, cumulative 75.5 per cent. Conveyor sensor faults: 190 minutes, 9.5 per cent, cumulative 85 per cent. Capper torque faults: 120 minutes, 6 per cent, cumulative 91 per cent. Palletiser faults: 90 minutes, 4.5 per cent, cumulative 95.5 per cent. All other causes: 90 minutes, 4.5 per cent.

    Three causes account for just over three quarters of the lost time. If the plant could halve only those three, it would recover 755 minutes a month, more than it would gain by eliminating every other cause on the list entirely.

    That is the message of a Pareto chart. The capper and the palletiser may be the faults people complain about, but they are not where the hours are.

    Count Stops as Well as Minutes

    A chart of minutes tells you where the time went. A chart of the number of stops can tell a different story, and it is worth building both.

    In the same month, suppose the conveyor sensor faults occurred 140 times, at a little over a minute each, while the filler valve faults occurred 12 times at 40 minutes each. By duration the valve is the bigger problem. By frequency the sensor is, and frequent short stops do damage that minutes alone do not show. They break the line’s rhythm, cause product to back up, wear on operators and are often under recorded because each one seems too small to log.

    The two charts point to different kinds of fix. Long, infrequent stops usually call for better parts, better spares holding or faster diagnosis. Short, frequent stops usually call for an engineering change at the source.

    Drill Down

    The first chart tells you where to look. It rarely tells you what to do. The next step is to take the largest bar and build a second Pareto inside it.

    Labeller jams at 620 minutes is a category, not a cause. Break it down by label type, by product, by shift or by which station on the machine jammed. You may find that most of the jams occur on one label size, or in the first hour after a changeover, or on one supplier’s reels. Each level narrows the problem until it is specific enough for root cause analysis. A Pareto chart selects the problem. Techniques such as the 5 Whys and the fishbone diagram then find the cause.

    Six Mistakes That Mislead

    A large other category. If other or unknown is one of your biggest bars, the data is not yet good enough to act on. Fix the recording first.

    Categories that are too broad. Electrical, mechanical and operator are departments, not causes. They start arguments and identify nothing.

    Mixing planned and unplanned time. Changeovers and cleaning are planned. Keep them separate from breakdowns, or count only the overrun beyond the planned time, as in the example above.

    Too short a period. One bad day can dominate a week of data. Use long enough to smooth out the exceptional event, or note it.

    Measuring only time. Some stoppages cost far more than their duration suggests because they scrap product or force a clean. Where that matters, build the chart on cost.

    Making the chart and stopping. A Pareto on the wall that never changes is decoration. Its value is in choosing a problem, fixing it and redrawing the chart.

    Getting Reliable Data

    The chart is only as good as what goes into it. Manual logs tend to capture the long stops and miss the short ones, and the cause recorded is often the operator’s best guess. That is still enough to start. As the plant matures, automatic capture of stop times from the line’s control system removes the guesswork about duration, leaving operators to select a reason from a short list.

    Keep the reason list short and specific, review it every few months, and add a category whenever other starts to grow.

    Using It Month After Month

    Review the chart with production and maintenance together. Choose the top one or two causes and assign each an owner. Investigate, fix and record what was done. Redraw the chart the following month. If the fix worked, the bar shrinks, a different cause moves to the top and the process repeats. Over a year this routine does more for line performance than most capital projects.

    Where BevTech Fits

    BevTech is a family owned engineering business in Richlands, Brisbane, with more than 25 years in beverage and FMCG manufacturing. Plants usually call us once the chart has shown them where the hours are going and the fix needs engineering: a control change to stop a recurring fault, a machined part to end a jam, a sensor relocated out of the washdown, or a line integration that stops product backing up. Our industrial electricians, automation engineers, mechanical trades and machine shop work as one team on Allen Bradley and Siemens controlled lines.

    If your top downtime cause has been the same for too long, use the contact form at bevtech.com.au/contact.

  • Why We Are Giving Away Our Shutdown Planning Checklist

    Why We Are Giving Away Our Shutdown Planning Checklist

    The Most Expensive Week on Your Production Calendar

    Ask any engineering or maintenance manager in a beverage or FMCG plant to name the most stressful week of their year and the answer is rarely a breakdown. It is the planned shutdown. A shutdown is the one window where every deferred job, every capital project and every compliance item competes for the same few days, with a restart date that production has already promised to the business. Every hour of that window is paid for twice, once in labour, parts and contractor costs, and again in the production the line is not running.

    After more than 25 years of shutdown and project work in Australian beverage and FMCG plants, we have seen shutdowns that restarted early and shutdowns that dragged a week past their date. The difference between them is almost never how hard people worked during the window. It is the quality of the scoping and planning done in the weeks before anyone picked up a tool. That conviction is why we have put our shutdown planning approach into a practical document, the FMCG and Beverage Plant Shutdown Planning Checklist, and made it freely available to download from our website.

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    Why Give It Away?

    The honest answer is that well planned shutdowns are better for everyone, including us. When we arrive on site for shutdown work, the jobs that run smoothly are always the ones where the scope was locked early, the parts were sighted on the shelf, and the control system changes were written and tested before the window opened. The jobs that turn into overruns are the ones scoped on the back of a purchase order three weeks out.

    We would rather work with plants that plan properly, and we would rather be part of that planning early, when engineering input can still change the outcome. Sharing the checklist costs us nothing except a few trade secrets that were never really secrets, because none of this is complicated. It is simply the discipline of doing the right things in the right order, starting earlier than feels necessary.

    There is also a simpler reason. Our business is family owned and has been built over decades on long relationships with manufacturers, from the largest names in Australian beverage production through to smaller regional operations. Useful, practical help has always been how those relationships start.

    What Poor Planning Actually Costs

    The visible cost of an overrun is easy to calculate: extra contractor hours, weekend penalty rates, expedited freight on the part that should have been ordered six weeks earlier. The larger cost is the one on the production side. A high speed canning or bottling line produces enormous value per hour, and every hour the restart slips is product that was promised to customers and is now not coming. In a contract packing environment, a late restart can mean penalties or a customer quietly moving volume elsewhere.

    Then there are the costs that never appear on a spreadsheet. Work rushed at the end of an overrunning shutdown is work done tired, under pressure, with testing compressed or skipped. That is how a shutdown intended to improve reliability ends up causing the next three months of niggling faults. It is also how safety shortcuts happen, and in our view no schedule is worth that.

    Against all of this, the cost of proper planning is a few structured meetings, a master work list, and the discipline to order long lead items on time. It is the cheapest insurance available in plant engineering.

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    Where Shutdowns Go Wrong

    The failure patterns repeat across almost every site. Scope arrives late, added in the final fortnight by people who were not in the early meetings, and every late addition bumps something else off the critical path. Long lead items are ordered on optimistic assumptions, so the gearbox or the PLC hardware arrives the day after the window closes. Contractor crews are booked late in shutdown season, when the good tradespeople are already committed. And control system work is treated as something that happens during the shutdown, rather than something developed and bench tested beforehand, so the window that should have been used for installation and commissioning gets consumed by programming.

    That last one deserves special attention, because it is the most common gap we see. PLC changes, HMI updates, drive replacements and safety circuit modifications all need engineering time before the shutdown and structured testing time during it. When we delivered the automated control system for two glycol refrigeration units cooling large beer tanks, built on a Siemens 1500 series PLC, the logic was developed and proven before installation, which is precisely why commissioning went to plan. The same applied to the hot water rinse system we implemented for a can seamer clean in place process on a Siemens 1200 series platform. Control work rewards preparation, and punishes improvisation.

    What the Checklist Covers

    The checklist is a working document, not a glossy brochure. It walks through six phases of a shutdown, starting eight to twelve weeks out and finishing after the line is handed back. The early sections cover building a single master work list across mechanical, electrical and automation scopes, ranking every job by production risk, and identifying the design, fabrication and long lead items that decide your critical path. The middle sections deal with parts, people and engineering readiness: confirming deliveries in writing, locking in contractor crews, backing up every PLC, HMI and drive parameter set, and walking every job at the machine before the window opens.

    The later sections cover the shutdown itself and what follows: protecting the critical path shift by shift, testing safety functions as they are reinstated, recommissioning system by system, and holding the review that makes the next shutdown easier. Each item exists because we have watched its absence cost a plant real money.

    One recommendation in the checklist is worth highlighting here. A shutdown window is the cheapest opportunity you will ever get to deal with control system obsolescence. Legacy Allen Bradley and Siemens hardware moves steadily through manufacturer lifecycle stages, and a planned migration during a scheduled window costs a fraction of an emergency migration after a failure. If your site has processors that have run untouched for fifteen years, the next shutdown is the time to act, and the checklist prompts you to assess exactly that.

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    How to Use It

    Download it, print it, and take it into your next shutdown planning meeting. Mark it up, argue about it, and adapt it to your site, because every plant has its own quirks and no generic document survives contact with a real production line unchanged. Its job is to make sure the right questions get asked early enough for the answers to matter.

    Use it alongside your existing maintenance systems rather than instead of them. The checklist does not replace a CMMS or a project plan. It sits above them as a sanity check that the fundamentals, scope discipline, long lead items, controls preparation, testing and handback, are actually covered.

    Planning a Shutdown? Talk to Us Early

    BevTech Engineering and Automation delivers shutdown work across mechanical, electrical and automation scopes from our Richlands base in Brisbane, with our own machine shop for fabrication and change parts, TUV certified functional safety engineers for compliance work, and deep experience on Allen Bradley and Siemens PLC platforms. The plants that get the most value from us are the ones that involve us at the scoping stage, when engineering input can still shape the plan rather than rescue it.

    The checklist is available to download now on our website. And if there is a shutdown on your horizon, whether it is three months away or next year, reach out through the contact form on our website and talk it through with our team while the calendar is still your friend.

@Fd2X@HoSi10178
Shutdown Checklist
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