1. What exactly is on the surface, and how thick is it?
Grease from a gear-cutting operation, dried cutting fluid on a machine bed, and a mixture of coolant residue and fine swarf are three different problems. High-temperature steam works by heating the contaminant until its viscosity drops so it releases from the surface; the temperature and the contact time matter more than raw pressure. Ask your supplier to state, in writing, which contaminant their machine has been run against and what was left behind. A supplier who has cut coupons of your own soil and cleaned them on a sample machine is giving you information. A supplier who only sends a brochure is not.
For shops whose main burden is oil and grease on machinery rather than dirt on floors, factory machinery degreasing equipment rated for continuous industrial duty is a different class from a portable unit sized for a wash bay. Fix your specification around the soil load first, then look at machines.
2. What can your building actually supply?
Three utility questions cause most installation delays:
- Power. A boiler with a 6 kW heater on a 220 V supply needs a dedicated circuit and the right protection device. Confirm what your panel can deliver at the point where the machine will stand, not at the wall socket ten metres away.
- Water. Mains tap water is acceptable on some designs and unacceptable on others, because dissolved solids scale a boiler from the inside. Ask whether the unit takes tap water, softened water or distilled water, and what the maintenance interval is if you use what you already have.
- Movement. A fixed unit bolted in one place cannot clean a machine tool that only leaves the line once a year. Decide whether the machine follows the workpiece or the workpiece follows the machine.
PowerDe's fixed steam cleaning machine PowerDe HW02 is a useful reference for how a specification should read: 220 V working voltage, 6 kW heating power, steam temperature stated at 160°, vapour pressure at 0.8 MPa, and an 80 L tank in SUS304 stainless steel, with an overall envelope of 1,200 × 800 × 1,200 mm including handles. Note the tank material and the dimensions in that list. Both decide whether the unit survives your environment and whether it fits your aisle.
3. Does the steam reach the geometry you have?
Ask to see the machine clean a real part or a real machine, not a flat test plate. Then ask what nozzles are supplied as standard and what costs extra. A wand that will not get under a guard, or a hose too short to cross a 4 m machine table, turns a good boiler into a poor tool. For a CNC machine cleaning equipment duty specifically, the practical details are the length of the hose, whether the lance reaches the enclosure rails, and whether the condensate can be collected rather than left on the shop floor.
4. Who fixes it, and how fast?
Steam equipment has a small number of wear items: seals, hoses, nozzles, heating elements, pumps and level sensors. Get the consumable list and prices before signing, and ask which parts your own maintenance technician can replace without special tooling. Ask, in plain words, what happens when the machine stops on a Friday: is there a service contact in your time zone, do spare parts ship from a local warehouse, and what is the response time? A supplier offering customised configurations and after-sales engineering support is more useful to a plant engineer than a longer feature list.
5. What does it displace, and what does it not?
Steam cleaning is often chosen because it uses far less water than hose-and-brush washing and reduces dependence on chemical detergents. Those are real operational benefits, and they should be confirmed against your own bills rather than a vendor's claim. Write down what you do today, what it costs in water, chemicals, labour hours and downtime, and what the new machine replaces. If your current method already meets your cleanliness requirement at a cost you can live with, no equipment change is justified. If cleaning is causing unplanned stoppages or failing an audit, the case is different.
6. What safety features are fitted, and what do they cover?
A steam generator at 0.8 MPa and 160° is not a low-risk device, and it usually stands next to electrical cabinets. Ask which protective functions are built in — leakage, short-circuit, over-temperature, low-water and over-pressure protection are the ones that matter in a plant with wet floors — and ask for the corresponding documentation. Then check that the protection scheme matches your earthing arrangement. If your safety officer cannot sign off the datasheet, the purchase is not ready.
Before you sign
Run one paid trial on your own equipment, with your own operators, on your own shift. Measure the time taken, the water and power consumed, and the result you would accept at a re-audit. Bring the trial sheet back to the quotation, and put the passing criteria into the purchase contract as an acceptance condition. That single step removes most of the risk from a cleaning-equipment purchase, and it is the cheapest test you will ever run on the subject.
If you need a machine built around a specific soil load, footprint or utility supply rather than a catalogue model, discuss the requirement with intelligent cleaning equipment manufacturer PowerDe at sales@powerde.net, quoting the contaminant, the machine geometry and the available power and water supply.
