Tag: breakdown response

  • MTBF and MTTR Explained: How Often Equipment Fails and How Fast You Recover

    MTBF and MTTR Explained: How Often Equipment Fails and How Fast You Recover

    Two Numbers That Describe a Line’s Reliability

    When a production line underperforms, the first argument is usually about why. Maintenance says the equipment is old. Production says repairs take too long. Both may be right, and without numbers the argument never ends. MTBF and MTTR are the two measures that separate the questions. One tells you how often equipment fails. The other tells you how long it takes to get it back.

    This guide explains what each measure means, how to calculate them, how they combine into availability and how to decide which one to work on.

    What MTBF Means

    MTBF stands for mean time between failures. It is the average length of time a repairable piece of equipment runs before it fails. A higher figure means failures are less frequent.

    The calculation is total operating time divided by the number of failures in that period. Operating time is the time the equipment was actually running, not the time it was scheduled to run.

    A related term, MTTF or mean time to failure, is used for items that are replaced and not repaired, such as a bearing or a lamp. For a production machine that is repaired and returned to service, MTBF is the right measure.

    What MTTR Means

    MTTR stands for mean time to repair. It is the average time taken to restore equipment after a failure, measured from the moment it stops to the moment it is producing again.

    The calculation is total downtime from failures divided by the number of failures.

    Be aware that the letter R is used in different ways. Some organisations mean repair, some recovery and some respond, and the clock starts and stops at different points in each. What matters is that your site chooses one definition and keeps to it. The most useful for production is the full stop to start time, because that is what the plant actually loses.

    A Worked Example

    A packaging line was scheduled to run for 400 hours in a month. It had 8 failures, which together caused 20 hours of downtime.

    Operating time is 400 hours less 20 hours, which is 380 hours.

    MTBF is 380 hours divided by 8 failures, which is 47.5 hours. On average the line runs for about two days of continuous production between failures.

    MTTR is 20 hours divided by 8 failures, which is 2.5 hours. On average each failure costs two and a half hours.

    How They Combine Into Availability

    Availability is the proportion of scheduled time that equipment is able to run. It can be calculated directly from the two measures: MTBF divided by the sum of MTBF and MTTR.

    For the example, that is 47.5 divided by 50, which is 95 per cent. The same answer comes from 380 operating hours out of 400 scheduled.

    The formula shows something important. There are two ways to raise availability, and they are quite different jobs. If this plant halved its MTTR to 1.25 hours with the same number of failures, downtime would fall to 10 hours and availability would rise to 97.5 per cent. If it instead halved the number of failures to 4, with repairs still taking 2.5 hours each, downtime would also fall to 10 hours and availability would again be 97.5 per cent. The result is the same. The work required to get there is not.

    What Drives MTBF

    Time between failures is mostly determined before the failure happens.

    Maintenance. Whether wear is found and corrected before it causes a stop.

    Operating conditions. Running within design speed and load, correct setup, clean and lubricated equipment.

    Design and installation. Components suited to the environment, particularly in washdown areas, and protection correctly set.

    Quality of repairs. A repair that fixes the symptom and not the cause guarantees the next failure.

    Parts. Correct, genuine or properly made replacements in place of near enough substitutes.

    Improving MTBF is slow. It takes months of consistent maintenance and root cause work before the figure moves, and it is where the largest long term gains are.

    What Is Hidden Inside MTTR

    Repair time is rarely one thing. Break an average stoppage into stages and the picture changes.

    Detection. How long before someone realises there is a failure and not a pause.

    Response. How long until a person who can fix it reaches the machine. Out of hours this can be the largest part.

    Diagnosis. How long to find the fault. This depends heavily on drawings, software access and familiarity with the machine.

    Parts. How long to get the replacement, from the shelf or from a supplier.

    Repair. The hands on work, which is often the shortest stage.

    Restart. Testing, cleaning where product was exposed and bringing the line back to rate.

    In many plants the actual repair is a small part of the total, and most of the time is spent waiting, searching and working out what is wrong. That is good news, because those stages can be shortened quickly and cheaply: current drawings at the machine, software backups, labelled panels, critical spares held on site and a response arrangement that puts the right person there fast.

    Which One Should You Work On

    Look at the pattern behind the averages.

    Few failures, long repairs. High MTBF and high MTTR. The equipment is fundamentally sound and the plant is poorly prepared when it does fail. Work on response, diagnosis and spares.

    Many failures, short repairs. Low MTBF and low MTTR. The team has become very good at fixing the same things. Work on root causes and maintenance, because the skill being shown in repair is being wasted on problems that should not recur.

    Many failures, long repairs. Both are poor. Start with MTTR for quick relief, then turn to MTBF.

    As a rule, MTTR improvements arrive in weeks and MTBF improvements in months. Most plants benefit from starting with the first while planning the second.

    Five Traps in the Numbers

    What counts as a failure. If a thirty second stop is a failure, MTBF will look terrible and MTTR excellent. Set a threshold and treat short stops separately.

    Averages hide extremes. Seven failures of twenty minutes and one of seventeen hours give a similar MTTR to eight failures of two and a half hours. They are different plants. Look at the spread.

    Mixing planned and unplanned stops. Changeovers and cleaning are not failures.

    Too little data. A machine that failed twice in a month has no meaningful average. Use longer periods for reliable equipment.

    Comparing unlike lines. A high speed filler and a palletiser should not share a target. Compare each asset with its own history.

    Starting to Measure

    You need three things for each failure: when the machine stopped, when it restarted and what failed. A shift log will do to begin with. Calculate both measures monthly for each main line, plot them and look at the direction. The trend matters more than the absolute value. If you can also record when the tradesperson arrived and when the fault was identified, you can split MTTR into its stages, which shows exactly where the time is going.

    Where BevTech Fits

    BevTech is a family owned engineering business in Richlands, Brisbane, with more than 25 years in beverage and FMCG manufacturing. We work on both sides of the availability equation. For MTTR, we provide 24/7 breakdown support and shift coverage, fast and methodical fault diagnosis on Allen Bradley and Siemens systems, as-built drawings and a machine shop that can make a part the same day instead of waiting on a supplier. For MTBF, we carry out electrical condition audits, planned maintenance and shutdown work, and engineering fixes for the faults that keep recurring.

    If your numbers show where the time is going and you want help getting it back, use the contact form at bevtech.com.au/contact.

  • Emergency Shift Cover for FMCG Plants: A Practical Playbook for Maintenance Managers

    Emergency Shift Cover for FMCG Plants: A Practical Playbook for Maintenance Managers

    The Phone Call Every Maintenance Manager Knows

    It usually comes between 4pm and 6pm. Tonight’s night shift electrician is sick, or their car has died, or they have just resigned by text message. The line is scheduled to run flat out until 6am, the peak season order book leaves no slack, and you have roughly two hours to solve a problem that recruitment normally takes months to solve. Every maintenance manager in Queensland’s FMCG sector has lived some version of this evening.

    The difference between plants that handle it calmly and plants that descend into chaos is not luck. It is preparation. This playbook sets out how to respond on the night, and more importantly, how to build a system so the night is never as bad again.

    Step One: Triage the Risk, Not the Roster

    The instinct is to think about the empty roster slot. Think instead about the risk profile of the coming shift. What is scheduled to run? A night of straightforward production on a well behaved line carries a different risk than a night involving changeovers, a temperamental seamer, or product transfers where temperature control matters. Ask what would happen in the worst plausible breakdown with nobody technical on site. Sometimes the honest answer is that the shift can run with a clear escalation plan and a callout arrangement. Often, especially in beverage production where product can be lost in bulk, the answer is that running uncovered is a gamble the margin does not justify.

    Write the triage logic down before you ever need it. A one page decision guide, agreed with production, turns a stressful argument at 5pm into a procedure.

    Step Two: Work Your Pre Built Options in Order

    On the night, you have four options, and their cost rises in order. First, internal swaps: can another shift’s tradesperson move, without creating a fatigue problem elsewhere? Second, voluntary overtime, used sparingly, because a team that plugs every gap with overtime is a team you are slowly burning out. Third, external shift cover from a provider who already knows your site. Fourth, running uncovered with an escalation plan, which is a risk acceptance, not a solution.

    The third option is only available at short notice if you built it in advance. A provider cannot induct someone, arrange access and match skills to your equipment in two hours from a standing start. But a provider with inducted, site familiar tradespeople on their books can often fill tonight’s slot with one phone call. That difference is entirely determined by work you did months earlier.

    Step Three: Set the Covering Tradesperson Up to Succeed

    When cover arrives, ten minutes of structured handover multiplies their value. Show them the shift plan and what good looks like. Point out the equipment with known quirks. Confirm isolation procedures, permit requirements and who to call for what. Leave them a written escalation ladder with names and numbers. A skilled contractor, well briefed, will run your shift competently; the same contractor, dropped in cold, will spend half the night learning things somebody could have told them in ten minutes.

    This is also where provider quality shows. Tradespeople supplied by a specialist FMCG engineering business arrive knowing how production environments work, how CIP and hygiene protocols constrain maintenance work, and how to conduct themselves around food grade equipment. That baseline cannot be taught at handover.

    Step Four: Close the Loop the Next Morning

    After every cover event, spend fifteen minutes on three questions. Did the gap arise from something preventable, like leave approvals that ignore the roster or a fatigue pattern pushing people toward sick days? Did the cover work, and if not, why not? And is this gap actually a vacancy in disguise? A roster that needs emergency cover twice a month is not suffering bad luck, it is understaffed, and the fix is structural: either recruitment or a standing arrangement for regular supplementary shifts.

    A Word on Fatigue, Because It Hides Inside Every Quick Fix

    Two of the four options in the playbook, internal swaps and overtime, quietly spend the same currency: your team’s rest. Fatigue is the silent variable in every emergency staffing decision, and in an FMCG plant it is a safety hazard with a lag. The electrician who covers a double tonight is impaired tomorrow, and the impairment arrives exactly when they are working on energised equipment or moving machinery. Set hard rules before the crisis: maximum consecutive hours, minimum breaks between shifts, and a cap on how many gaps per month may be plugged with overtime before the roster is formally declared understaffed. Then treat external cover not as an admission of failure but as the mechanism that lets you honour those rules under pressure. Plants that write fatigue limits down and hold to them make better 5pm decisions, because the tempting shortcut has already been ruled out on a calm afternoon by people who were thinking clearly.

    Building the System Before You Need It

    Everything above depends on groundwork. The plants that handle roster shocks well share four habits. They maintain a live relationship with a shift cover provider, with commercial terms agreed and inductions current, so short notice requests are administratively trivial. They keep equipment documentation and escalation contacts in a state a stranger could use at 2am. They track their cover events, so patterns surface. And they choose a provider with genuine technical depth, because emergency cover is precisely when you cannot afford a passenger.

    On that last point, the provider’s own capability matters more than its database. BevTech, a family owned engineering firm with more than 25 years in FMCG and beverage manufacturing, supplies shift cover across Brisbane and Queensland from the same pool of industrial electricians, fitters, turners and automation technicians who support its engineering work on Allen Bradley and Siemens control systems, machine safety and precision machining. Behind every covering tradesperson sits a 24/7 engineering business with a fully equipped workshop, which means a bad night on your site can escalate to genuine expert help instead of a voicemail.

    Turn the Worst Phone Call Into a Routine One

    You cannot prevent every roster gap. People get sick, cars break down, and resignations arrive without warning. What you can do is decide, in advance, that a gap will be an administrative event rather than a crisis. Build the triage guide, agree the escalation ladder, and put a specialist cover arrangement in place before summer peak makes every shift critical.

    BevTech works with FMCG and beverage manufacturers across Queensland to provide exactly that safety net, with 24/7 availability and tradespeople assessed by working engineers. Start the conversation through the contact form at bevtech.com.au, ideally on a quiet afternoon rather than at 5pm on the day you need it.

@Fd2X@HoSi10178
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