What documentation should accompany delivery of thin-film laser cutting machines?

A water tank is the least visible part of a steam cleaning machine, and it is usually the first thing that fails after delivery. Scale chokes a heater, a cracked seam leaks onto an electrical bay, and an inlet that will not seat lets air into the pump. An acceptance check carried out when the equipment arrives on site catches these problems while they are still the supplier’s responsibility, before the machine enters a service schedule. The list below follows the order an inspector would use: paperwork first, then the dry checks that need no water, then the wet and thermal checks, and finally the items that decide whether the tank can be trusted in daily duty.

What the tank is required to survive

A steam unit is filled with tap water, heats that water, and then asks the same vessel to hold it hot, pass steam at pressure, and sit idle between shifts with moisture inside. The PowerDe HW02 fixed steam cleaning machine is rated at 220 V with a 6 kW heater, and its detail page lists a tank made of SUS304 stainless steel. The material matters at acceptance because it tells the inspector what to expect from the surface: a stainless weld should be clean and continuous, and any discolouration or pitting inside a joint is something to raise on the day rather than a cosmetic detail to accept.

The same listing records an 80 L clean-water tank and a tap-water inlet with a 4-point internal-tooth joint (1/2 inch). Those two details set the practical reference points for a receiving check: a container that must be filled and drained repeatedly, connected to an ordinary hose bib rather than to a plumbed water line. Do not assume that every model carries the same capacity or the same fitting. The hand-pushed HMW3 unit is documented with a 50 L clean-water tank, and several mobile models in the range are sold with and without a battery, which changes how the tank sits relative to the electrical compartment. Where the paperwork and the nameplate disagree, write down both values and stop before signing; a capacity or fitting mismatch is a documentation problem for the supplier to resolve, not something to absorb on site.

Part 1 — Paperwork and configuration before the crate is opened

Copy the model code, the variant, and the tank capacity from the purchase order onto the acceptance sheet. PowerDe publishes battery and non-battery versions of the same chassis, so the order line has to match the delivered machine. Compare the nameplate on the unit with that sheet: model code, working voltage, heater power, and the tank capacity printed in the parameters.

Then check the documents that travel with the shipment — the packing list, the operation manual, the wiring diagram, and any warranty card. A tank is hard to claim under warranty later if the paperwork never recorded which capacity and which fitting were supplied. Photograph the nameplate and keep the images with the acceptance sheet.

Part 2 — Visual and mechanical checks with the tank empty and cold

Work these items before any water enters the machine, because a leak found in a dry check costs nothing while a leak found after filling costs a day.

Shell and welds: look over the tank body and every accessible seam for dents from transport, for damage to the finish near the heater, and for discolouration at the welds.
Interior, as far as the eye reaches: through the fill opening, confirm there is no loose scale, swarf, weld spatter, or packing off-cut left inside. Manufacturing debris is a routine cause of a pump that fails in its first month.
Fill opening, lid, and seal: the lid should seat squarely, the gasket should sit in its groove without a twist or a bare edge, and the threads or clamps should engage cleanly by hand.
Inlet fitting: confirm the joint matches the hose bib on site. On the HW02 the inlet is documented as a tap-water connection with a 4-point internal-tooth joint at 1/2 inch; test it with the hose you actually use, and check that the fitting does not cross-thread.
Drain and low-point valve: locate the drain, open it, and confirm it turns without force and closes without dripping. A machine that cannot be emptied will be left full of standing water over the weekend.
Sight glass or level indicator: confirm the glass is undamaged and readable from the operator’s normal standing position, not hidden behind a handle or a hose.
Mounting: check the tank brackets and fasteners for tightness, and confirm the tank does not shift when the frame is pushed. On battery versions, look at the clearance between the tank and the battery compartment and confirm no cable is trapped against the tank wall.
Water-shortage protection hardware: find the level sensor or float and confirm the wiring is connected and the sensing part is not coated with paint or sealant.

Part 3 — Fill, leak, and hold test

Fill the tank with cold tap water to the normal working level and watch it for at least thirty minutes. Inspect the underside of the tank, every joint, the drain, the sensor entry point, and the floor beneath the machine. A dry floor after the hold period is the pass criterion.

While filling, watch two behaviours that say more about the tank than any visual inspection. First, the fill rate through the fitted inlet should not stall or gurgle, which points to an air path or a blocked inlet strainer. Second, the level indication should rise smoothly and reach the working mark, not sit still and then jump.

Then drain the tank completely and time it. Drainage that leaves a standing pool tells you the low point is wrong or the drain line is kinked, and standing water is what freezes in a cold store and what causes odour in a food-service unit.

Part 4 — Cold functional checks that involve the tank

Run the machine without heating, so the checks below test the water path alone.

Pump prime: with a full tank, start the unit and confirm it draws water without a prolonged cavitation noise or the need to bleed the line.
Dry-run protection: with the tank empty, start the machine and confirm the water-shortage protection stops the cycle before the heater is asked to work. The HW02 and HMW2 product pages list water-shortage protection among the safety features; on site you only verify that it trips.
Mode selection: switch between the dry-steam and wet-steam modes available on the unit and confirm the selector responds. Both the fixed and the mobile models in the range are described as offering dry and wet steam, and the difference between the two is exactly what an operator notices in the first week.
Hose and gun: once the water is moving, check the gun, the hose, and each nozzle for a leak at the coupling under pressure.

Part 5 — Hot run: thermal and pressure behaviour of the tank

Heat the machine with a full tank and keep an operator with it. Note how long it takes to reach a working steam output, watch for weeping at seams that were dry when cold — thermal expansion is where a marginal gasket shows itself — and confirm the level drop during a normal run matches the duty figure the supplier gives you for that model.

Record the steam temperature and pressure shown on the machine and put those observed values on the acceptance sheet. The HW02 page lists 160° steam temperature and 0.8 MPa vapour pressure for that model. Write the reading you actually saw beside the published figure, and question a large difference rather than overwriting either one; a discrepancy may be an instrument problem, a supply-voltage problem, or an error in the published copy.

Finally, shut the machine down, let it cool, and look again for dampness around the tank and the heater. A hot-to-cold cycle is the honest test of a seam, and acceptance is the moment to run it.

Water quality: the item most buyers leave out

The tank is where scale begins, and scale is the failure mode that acceptance cannot test for directly because it takes months to show. Ask the supplier in writing what water the machine is designed for, and what the descaling interval and method are. The PowerDe pages describe a tap-water inlet rather than a built-in softener, which means the water on your site decides the service life of the tank and the heater. Record the agreed interval on the sheet, and decide now who owns the descaling task in your own maintenance plan.

Common tank defects and what they cost later

A gasket pinched during assembly: passes a cold check, weeps on the first hot cycle, and shows up as an intermittent leak the operator cannot reproduce.
An inlet that cross-threads: slow fill, air getting into the line, a noisy pump, and a fitting stripped beyond repair within a season.
A blocked level sensor: no low-water trip, a heater running dry, and a failed element that a warranty claim may refuse if the machine was used against the manual.
Hard water from day one: steam output fades, the heater runs longer to keep up, and the energy cost per vehicle rises without any single dramatic failure.

Recording the result and closing the check

The acceptance sheet should carry the model and variant, the nameplate values, the observed fill time, drain time, temperature and pressure readings, the water-shortage trip result, and a signed line for any open item. Sign nothing for a defect that has no agreed remedy and no date. A buyer who keeps this sheet has a defensible record months later, when the machine is in service and a fault report needs evidence.

If your site needs a capacity, a voltage, a battery configuration, or a water connection that differs from the published models, settle the specification before the order rather than adapting the machine after delivery; the range spans fixed units, hand-pushed units, and driving-style units, so the differences at the tank are real and they are decided at the quotation stage. Talk to Shenzhen PowerDe Automation Precision Equipment about the tank specification for your duty cycle before the equipment is built.