Start with the line, not the machine
Most cleaning quotations for a factory go wrong before anyone opens a specification sheet. The buyer sends a list of machines, receives a list of prices, and then discovers that the two lists do not match the way the line actually runs. Before you compare any two cleaning equipment offers, write down three things about your own assembly line: how long the line can stand still, how far the cleaning machine has to travel between cleaning points, and what the surface being cleaned actually is — a machine enclosure, a fixture, a trolley, an extraction hood, or the floor beside the line.
Those three answers decide the equipment class far more than brand reputation does. A line that can stop for twenty minutes at shift change needs a different machine from a line where cleaning has to happen between batches without disturbing takt time. The rest of this article turns that starting point into a question set you can send to suppliers and use to compare their answers side by side.
Question 1 — Can the cleaning duty happen while the line is running?
Ask the supplier directly: does this machine belong beside a live line, or does it need the area cleared? A fixed, mains-powered unit such as the Fixed Steam Cleaning Machine PowerDe HW02 runs on 220 V with 6 kW of heating power, delivers steam at around 160°C and 0.8 MPa, and carries an 80 L SUS304 tank in a cabinet measuring 1,200 × 800 × 1,200 mm including handles. That combination suits a fixed cleaning point: you plumb it into a tap-water inlet, park it at a station, and operators walk to it. It is not a machine you chase along thirty metres of line.
A battery-fed unit answers the opposite situation. The Hand Pushed Steam Cleaning Machine PowerDe HMW3 works on a 48 V battery supply, uses a 4.5 kW PTC semiconductor heater, and pushes through aisles at 1,150 × 520 × 1,030 mm with a 50 L clean-water tank. No trailing cable across an aisle that fork trucks cross. Compare the two suppliers on where the energy comes from, not on the word "industrial" in the brochure.
Question 2 — Which steam mode does your soil actually need?
Ask for the mode list in writing. "Dry steam" and "wet steam" are not marketing adjectives; they decide how much liquid reaches the surface and therefore how much wiping, drying and run-off you get afterwards. Dry steam carries most of its cleaning power as heat, which suits grease film on a machine housing, while wet steam adds moisture for crusted residue and leaves more to dry off. Some mobile machines on the PowerDe cleaning equipment series page, including the driving-style PWD01, PWD02 and HMW2 units, are listed with dry steam, wet steam and hot water modes, so the operator can pick the mode per task instead of running one mode everywhere.
- Ask which modes the machine offers, and whether the operator can switch modes during a job or only at shutdown.
- Ask which mode the supplier recommends for your soil, and describe the soil concretely: cutting fluid film, way oil, adhesive residue, food residue, dust plus oil mist.
- Ask what the surface is left doing afterwards — wiped dry, blown dry, or left to drain — because that determines whether cleaning can happen next to a live line at all.
Question 3 — What does the specification sheet leave out?
The comparison table only works when every supplier answers the same blanks. Published product pages are a starting point, and they are frequently incomplete for exactly the numbers that drive a factory decision. For the HMW3 hand-pushed machine, for example, the detail page gives dimensions, heating power, tank volume, water inlet type, steam modes, battery voltage and the cleaning tool, but it does not state steam temperature or pressure, battery capacity and runtime, charger output, machine weight, hose and wand lengths, the accessory list, noise level, or water consumption per hour. Put those items in your request for quotation, and treat a supplier who answers them properly as the more useful one to talk to.
| Ask every supplier for | Why it decides the choice |
|---|---|
| Steam temperature and pressure | Sets what the machine can move, and whether one pass or several |
| Runtime per charge, or duty cycle on mains power | Determines how many cleaning points one operator can cover per shift |
| Tank volume and refill points needed | Refills interrupt the job; a fixed station usually wins here |
| Footprint, door width and turning space | Line-side aisles reject machines that look fine on paper |
| Power supply and water inlet already at the point of use | Utilities you do not have become a second project |
| Accessories and nozzle set included | Fixtures, corners and hoods need different tools |
Question 4 — Who moves the machine between cleaning points?
On a long line this question is the real cost. A machine that has to be lifted, or that runs out of battery halfway, transfers labour onto your team for the whole life of the purchase. Walking distance per cleaning cycle multiplied by cycles per day multiplied by shifts is the number to compare against, and it is usually larger than the difference between two quotations. If operators cover a wide area, look at whether the catalogue separates hand-pushed machines from driving-style machines, as the PowerDe list does, and check which variants are supplied with a battery and which are not — several models are listed both ways, and the difference is not cosmetic.
Question 5 — What protects the operator when the machine is used by whoever is free?
On a production floor the cleaning machine is rarely run by a cleaning specialist; it is run by the operator whose station is quiet. Ask what fails safely. The HW02 page lists leakage, short-circuit, high-temperature, high-voltage, water-shortage and high-voltage-explosion protection, and several mobile models list leakage, short-circuit, high-temperature, high-voltage and water-shortage protection. Ask what happens on low water, what the surface temperature of the machine and lance reaches during a long job, and what interlocks exist. Then ask how that protection is explained to a new operator, because a safety feature nobody was trained on is not a feature.
Question 6 — Does the supplier build to your line, or only ship what is on the shelf?
Ask about the engineering route. Shenzhen PowerDe Automation Precision Equipment Co., Ltd. has been manufacturing automation equipment in Shenzhen since 2007, and its stated work covers equipment research and manufacturing, system integration, customized configuration and technical support. For line-side cleaning, that matters in a practical way: a fixed cleaning point sometimes needs the cabinet moved, the inlet adapted, or the tool set changed to match your fixtures. The customization and solution route on the site exists for that kind of conversation, where you send the layout and the soil description and the supplier answers with a configuration instead of a single stock model.
Use that conversation as a comparison tool as well. A supplier who asks for your line layout, your shift pattern and a photograph of the dirt is doing qualification work. A supplier who only sends a price list is selling a box.
Question 7 — What does the trial prove before the purchase?
Insist on one machine, one surface, one measured result. Pick the worst cleaning point on your line, clean it with the candidate machine, and record what actually happened: passes needed, minutes taken, what had to be covered beforehand, what was left to dry, and whether the line restarted on schedule. Do not accept a demonstration on a clean test panel, and do not accept a demonstration on someone else's soil.
- Choose one real cleaning point on your own line, agreed in advance with production so the trial is not blocked.
- Photograph the surface before and after, with the same lighting and angle.
- Time the whole task, including travel, refill and clean-up, not just spraying time.
- Write down what the operator complained about, because that is what resists the purchase later.
- Repeat on a second surface type before comparing two machines, so each has a fair result.
Two things this question set will not settle. Cleaning the parts travelling along the line — a parts wash duty — is a separate equipment category, and it is not covered by the steam cleaning machines discussed here; raise it separately with the supplier. And some industry-specific cleaning terms you may see quoted around the product pages, kitchen and machine-tool cleaning included, are not stated as claims on the machines' own pages, so ask for confirmation in writing before you put them into your internal approval paperwork.
The shortlist question
When the answers are in, the comparison usually reduces to one sentence: which machine can reach your worst cleaning point, in the time your line allows, with the utilities you already have, without pulling an operator off the line to babysit it. If a supplier cannot answer that sentence with your numbers, they are not ready for the quotation.
