A pipe jacket, a grease-skinned duct wall and a painted machine housing all tell the same story: the grime you can see is only the outer layer of what you are being asked to remove. Before anyone quotes you a machine, the assessment should start with the surface itself, because that answer decides the mode, the pressure and the water volume the job actually needs.
What the pipe or component is made of
The base material sets the limits. Stainless and carbon steel tolerate heat and pressure that would blister paint, lift insulation and destroy the finish on anodised or powder-coated parts. Plastic housings, cable looms, seals and label areas cannot take the same treatment as bare metal. Write down, for each item in the scope, what it is made of and what coatings it carries. That list, not the catalogue, is the first specification sheet.
Where electrical connections, bearings or bearings seats are in the scope, confirm that the surrounding area can take water at all, and confirm what must be masked or protected before a nozzle goes near it.
What the deposit actually is
Loose dust blows off. Oxidised oil does not. A buyer should describe the deposit in workable terms:
- Loose dust, salt, light splashing: low-pressure water and mechanical wiping usually finish the job.
- Fresh oil and cutting fluid: warm water with detergent does most of the work; heat is a helper, not the main agent.
- Baked or polymerised grease: hardened on hot surfaces, it resists cold water and detergent until it is softened by heat.
- Mixed carbonised residue plus abrasive grit: needs heat to break the bond and enough impact to carry the solids away.
Ask the supplier to run the deposit you send or show them, not a demo panel. A demonstration on a clean test plate proves nothing about your plant.
Dry steam, wet steam or hot water: the choice is the machine
This is where most purchase decisions go wrong, because the word steam covers two different processes. Dry steam is low in water content, carries heat, produces minimal runoff, and suits vertical and overhead work where you cannot collect waste. Wet steam and hot water deliver more water and more impact, which is what moves heavy deposits off horizontal surfaces. A PowerDe steam cleaning machine in this class is built to switch between dry and wet steam on one unit, which is worth having when your cleaning scope contains both types of surface.
For pipe exteriors specifically, ask whether the unit can hold a low-water mode while still delivering the heat you need. Runoff you cannot contain becomes downtime and a waste-disposal problem, not a cleaning advantage.
Parameters to write into the RFQ
Do not buy on a brochure headline. Request these figures in writing and check them against your own site conditions:
- Steam temperature — measured at the outlet, not at the boiler. The Fixed Steam Cleaning Machine PowerDe HW02 is listed at 160 °C.
- Vapour pressure — the HW02 is specified at 0.8 MPa. Match it to the nozzle you will actually hold.
- Heating power — the HW02 is a 6 kW unit. Compare that with the duty cycle you need; an undersized heater recovers slowly between jobs.
- Tank volume and material — the HW02 carries an 80 L SUS304 tank. Water supply arrangements at your plant decide whether a tank, a mains inlet, or both are required.
- Working voltage — the HW02 runs on 220 V. Confirm supply availability at each work point before the machine arrives.
- Machine footprint — 1200 × 800 × 1200 mm including handles on the HW02. Test that route against aisles, doorways and the space around the equipment.
Any figure a supplier cannot state on a data sheet is a figure that should not appear in your evaluation form.
The site conditions that decide whether the machine is usable
A steam unit that cannot reach the job is dead capital. Check power availability and cable reach, water inlet type, drainage or recovery arrangements, floor slope and the turning radius the operator needs with the unit loaded. For fixed installations such as the HW02, decide where the unit will live; a machine stored far from the work point gets used less and is cleaned less often.
Where the work moves between bays, a mobile unit is a different buying decision. Where the work sits in one place, a fixed unit with a proper tank and supply connection is usually the more stable choice.
Safety and protection claims to verify on site
High-temperature, high-pressure equipment should carry protection against leakage, short circuit, high temperature, high voltage and water shortage, and this is a stated part of the HW02 design. Verify these claims during commissioning, not only in the manual, and confirm that your electrical supply is compatible with them. Then agree the operator routine: personal protection, hot-surface protocol, and what happens when the tank runs dry.
Run a real trial on one pipe run
Pick one representative section: same material, same coating, same deposit age. Clean it with the candidate machine and record what you measure — passes per square metre, elapsed time, water used, runoff generated, and whether the surface was damaged or discoloured. That trial, not the specification table, is the evidence for your purchase. If the trial is not offered, treat it as a missing clause in the contract.
If you want your scope and deposit samples assessed before you issue an RFQ, customised cleaning equipment enquiries can be raised directly with PowerDe's engineering team, with the site constraints supplied alongside the cleaning requirement rather than after the quotation.
