A plant engineer rarely buys an industrial steam cleaner because a catalogue looks impressive. They buy it because someone on the floor complained that a task cannot be finished inside the window available, and that complaint hides a set of questions the engineer has to answer before money moves. The questions below are the ones worth putting in writing before a quotation is requested, and each one produces an answer you can check later instead of a claim you have to trust.
What exactly is being cleaned, and how dirty is it?
Start with a surface list, not a machine list. Write down every surface the cleaner is expected to touch, the material it is made from, its coating if it has one, and the soil on it. Then separate the soils into three behaviours: a fresh wet film that moves when wiped, an aged sticky film that does not, and a film holding abrasive particles such as grinding dust. The third case is the one that ruins quiet purchases, because the risk is not the soil but the particles being pushed across the surface. Photograph each case where it sits and keep the photographs; a supplier who cannot see the soil cannot tell you whether their method reaches it.
Which surfaces must never be sprayed?
Before any machine is discussed, get the area owner to sign a no-spray list. Control cabinets, terminal boxes, lighting, sensors and encoders, cable carriers and connectors, linear guides running under an oil film, bonded insulation, vents and breathers. This list decides which nozzle types are usable and how much shielding the job needs. An engineer who asks for a machine before producing this list will receive a recommendation built on somebody else's factory, and will pay for it in the first trial.
How much water can the area tolerate, and where does it go?
The practical decision is not between steam and water in the abstract; it is between dry steam, wet steam and hot water, because each delivers a different amount of liquid to the floor. If the area has no drain, the collection plan has to exist before the method is chosen. Ask where the run-off goes and whether that route is open during the cleaning window, and whether it handles oil. Standing water extends the time before an area can be used again and adds a slipping hazard, so a method that saves water but leaves the floor wet longer has not saved anything. When you compare options such as commercial steam cleaning equipment, ask the supplier to state the expected water delivery per hour for a stated gun distance, number of passes and dwell time, rather than accepting a general statement about low water use.
What does the installation already provide?
Walk the route with a tape measure. Is there a protected circuit at the working position, and can the cable reach without crossing a walkway? Where is the nearest tap, how far is the walk, and can a hose cross grating and kerbs on the way? How is the machine refilled during a shift, and what fittings are fitted? On the PowerDe HW02 steam cleaner product page, the published installation items are a 220 V working voltage, 6 kW heating power, an 80 L SUS304 tank and a half-inch four-point internal-tooth mains water inlet. Those numbers describe mounting conditions for one fixed machine; they are not a claim that any particular surface in your plant can be cleaned. Use them as an example of the specification detail you want every supplier to state, including which adapter fittings are supplied with the machine.
What numbers do you already have?
Any purchase comparison is worthless without your own baseline, and a plant engineer can measure four figures in a single shift on one area: gun run time in minutes, the number of stops for refilling and hose re-routing, walking distance to the nearest water point, and how long surfaces take to dry before work resumes. These are the figures a new machine has to beat. Ask your own people to do the trial on the dirtiest area you have, inside a window that has already been isolated, with the machine settings frozen and signed off before the trial starts: mode, nozzle, gun distance, travel speed, number of passes and dwell time. Compare against your own numbers, not against a brochure.
What happens to the machine after a year of use?
Feed water carries hardness into heaters and steam generators. Scale changes flow and output over time, so a machine that performed well at commissioning can drift without anyone deciding to change the method, and the cost reappears as descaling labour and part replacement. Ask for the inlet filter arrangement, a consumables list with part numbers and lead times for nozzles, seals, filters, hoses and gun heads, and a stated descaling interval with a hardness limit. Then put the descaling owner in the same controlled document that carries the cleaning parameters, otherwise one side of the equation changes while the other stays frozen.
What does the quotation have to carry?
A usable quotation contains a frozen set of numbers: the mode and nozzle being offered, the expected water delivery per hour at that setting, tank capacity, the inlet fitting and adapters supplied, the power the machine needs, and a consumables list with part numbers. What you send in return is not a model number but your surface list, the signed no-spray list, soil photographs, the four baseline measurements, the site facts for that position, and where drainage goes. If your areas do not match a standard machine, raise it as a finding from your own walk-through and ask about customized steam cleaning equipment on the strength of that evidence.
Before signing anything, read back the short list: four baseline measurements taken by your own people; the supplier's written description of the method, including gun distance, passes and dwell time; a per-position drawing of tap, power and drainage; a trial sheet with frozen settings and an operator signature; a consumables list with part numbers and lead times; a named descaling owner with an interval; and a drying-time comparison against the method you use today. If you cannot produce those seven items, the purchase is not ready, and PowerDe can be asked through the contact page to answer the questions your walk-through raised.
