A maintenance planner who is asked “how long will that take?” usually has no better answer than a guess carried over from the last shutdown. Grease on factory machinery is uneven by nature: it thickens on horizontal surfaces, hardens near hot components, and hides in ways, corners and drive covers that are easy to miss. A defensible time estimate comes from measuring the work in a repeatable way, not from a rule of thumb. The steps below describe how a facilities team can build that estimate before a machine is taken out of service.
Break the cleaning task into timed units
Estimate the whole job by summing the parts. For each machine, record four separate blocks of time:
- Access and isolation — guarding removal, lockout/tagout, masking of bearings, motors, electrical encoders and sensor cabling.
- Loosening — the dwell time between applying heat and starting to wipe or rinse. Grease that has been heated comes off; grease that has only been wetted usually does not.
- Removal — actual labour per square metre of surface, split by horizontal, vertical and overhead.
- Dry-out and restart — wiping down, compressed-air blow-off or waiting, then reassembly and a first-run check.
Access and isolation are frequently the largest single block, because they are done once per machine but repeated on every visit. Treat them as a fixed cost per machine and apply it consistently across the estimate.
Use a timed sample, not a guess
Choose one representative machine and run the cleaning with a stopwatch. Score its surfaces on a simple three-level scale — fresh oily film, built-up soft grease, baked or polymerised residue — and log the minutes against each level. Then map the other machines in the area onto the same scale and multiply.
Score surfaces by type, not by machine. A gearbox housing, a conveyor frame and a splash guard each behave differently, and a per-surface rate transfers cleanly from one line to another while a “hours per machine” figure does not.
Two numbers make the estimate useful rather than decorative: the square metres actually cleaned, and the number of people working at the same time. Divide the surface area by the crew size to get per-person coverage, then carry that rate to the rest of the plant. Add a contingency allowance for the surfaces the sample run did not include, and state the allowance openly so the plan is credible when it is reviewed.
What lengthens the job
A handful of conditions reliably stretch cleaning time, and each can be checked off in advance:
- Time since last clean. Grease that has been through repeated heat cycles bonds to paint and to bare metal, and needs longer heat exposure before it moves.
- Grease type. Graphite-bearing and EP greases leave a dark, tenacious film; chain and wire-rope lubricants spread into a wide, thin coat that has to be contained.
- Design of the machine. Sealed housings clean quickly. Machines with bolt-on covers, ribbed castings, cable trays and welded seams take markedly longer per square metre.
- Floor and drainage. Rinewater has to go somewhere. Without a drain or containment route near the machine, crews spend time moving, refilling and emptying.
- Sensitive parts nearby. Bearings, seals, belts and instrumentation force slow, shielded work and add masking time.
If a machine sits inside a production schedule, the window itself sets the limit. Cleaning that must finish inside a four-hour changeover is a design constraint, not a preference, and it should be written into the estimate from the start.
Heat changes the removal step more than any other variable
Solvent wiping and cold high-pressure water attack the surface of the deposit. Heat changes the state of the deposit, which is why the removal block of the estimate falls so sharply once it is applied. For plant maintenance, a fixed electric unit is usually the right place to start, and the industrial steam cleaning equipment listed in PowerDe's cleaning series is built for that kind of stationary workshop work.
The Fixed Steam Cleaning Machine PowerDe HW02 is documented on its product page as a 220 V unit with 6 kW heating power, steam temperature of 160°, vapour pressure of 0.8 MPa and an 80 L SUS304 tank, with switching between dry and wet steam. The published parameter list covers power, temperature, pressure, tank and footprint, so a planner can size electrical supply, water feed and floor space around it; steam temperature and pressure are not published for the hand-pushed HMW3 model, and should be confirmed with the manufacturer before it is used to cost a job.
For planning purposes the practical reading is this: dry steam carries less water, so surfaces leave drier and restart sooner, which shortens the dry-out block and is useful around electrical and drive components. Wet steam delivers more heat into a thick deposit, which shortens the loosening block on heavy build-up. A machine that switches between the two lets a crew match mode to surface instead of buying a second unit, and the difference shows up directly in the estimate.
The same reasoning applies where several machines sit in one bay and the crew has to reach them. Mobile and hand-pushed units in the PowerDe cleaning equipment range let crews move between machines instead of dragging hoses and tanks across the floor, which cuts the travel time that quietly absorbs part of every shift.
Build a repeatable standard
The first estimate is a measurement; the value comes from keeping it. After each clean, record the machine, surface area, crew size, mode used and actual minutes. Within a few cycles you have plant-specific rates, and the question shifts from “how long do you think?” to “last time this machine took this long.”
Three entries make the record worth keeping: the interval that actually triggered the clean, the time spent, and whether the surface came back to standard on the first pass. Rising times on the same machine are an early signal that lubrication is escaping or that a seal has failed — information worth more than the labour saving.
A short planning checklist
- Walk the line and score every surface on the three-level grease scale before quoting hours.
- Time one machine end to end, split into access, loosening, removal and dry-out.
- Confirm 220 V supply capacity, water feed and a drainage or containment route at the machine.
- Assign dry steam to electrical and drive areas, wet steam to thick deposits, and note the split in the plan.
- Log actuals against the estimate after every clean and revise the rate.
If the plant has machines that no current unit can reach in the available window, that is a specification question rather than a scheduling one. PowerDe's engineering services pages cover customised configurations and equipment development, which is the right place to start when a standard model does not match the line: customised cleaning equipment.
