Factory Acceptance Testing and Commissioning for Industrial Laundry Equipment
Most disputes between a laundry plant buyer and an equipment manufacturer trace back to the same gap: a factory acceptance test that was signed off without anyone checking what it actually covered. FAT and site commissioning answer different questions, and treating them as one step is where the trouble starts.
Published July 6, 2026 — Stalwart Engineering Technical NotesA factory acceptance test (FAT) verifies that a machine, as built, meets its design specification before it leaves the manufacturer's works. Site commissioning verifies that the same machine performs correctly once installed, connected to real utilities, and run under actual plant load. Buyers who conflate the two often assume a clean FAT report guarantees a trouble-free installation, and are then surprised when a machine that ran perfectly on the factory floor underperforms once it is coupled to the plant's own steam, water, and electrical supply.
What FAT actually verifies
A properly structured FAT checks dimensional conformance against the approved general arrangement drawing, verifies motor nameplate data and control panel wiring against the electrical schematic, runs the machine through a full unloaded cycle to confirm sequencing and interlock behaviour, and where practical runs a loaded test cycle using a dummy load or, for washer-extractors, an actual textile batch to record extraction speed, cycle time, and vibration at each stage. It is not, however, a test of how the machine will behave on the buyer's own water hardness, voltage stability, or steam pressure, because none of those conditions exist at the factory. A manufacturer testing on filtered municipal water and stabilised three-phase supply is not lying by presenting a clean result; the result is simply scoped to conditions the buyer's site will not replicate.
Structuring the protocol before the machine ships
The FAT protocol should be agreed and signed by both parties before the machine goes into final assembly, not drafted the week before the buyer's engineer travels to witness it. A workable protocol lists every parameter to be measured, the instrument used to measure it, the acceptable tolerance band, and who signs against each line item. For a hydro extractor this typically includes final spin speed against tachometer reading, basket runout, and vibration amplitude at the bearing housing during the spin phase; for a steam-heated ironer it includes chest surface temperature uniformity across the roll width, measured at several points rather than a single centreline reading that can mask an uneven hot spot.
Witnessed versus documented FAT
A witnessed FAT, where the buyer's own engineer or a third-party inspector is physically present, costs more in travel and time but catches issues a documented FAT (photographs, video, and a signed report from the manufacturer's own quality team) cannot, particularly intermittent faults that only appear over a longer run duration. For a first order from a new supplier, or for a machine central to plant throughput such as the primary tunnel washer or boiler, a witnessed FAT is worth the added cost. For a repeat order of an already-proven machine model, a documented FAT with photographic evidence against the agreed checklist is usually sufficient, and this is a reasonable point to negotiate on price with the supplier.
What changes between factory floor and installed site
The largest source of post-installation disputes is a specification gap between factory test conditions and actual site conditions that nobody flagged before shipment. Voltage stability, water hardness feeding a wash cycle, ambient temperature and humidity affecting a dryer's stated cycle time, and steam pressure at the point of use after piping losses are all site variables the FAT cannot capture. A capacity sizing exercise done properly at the design stage should already have flagged the utility parameters the machine needs, and the FAT should confirm the machine meets its spec under conditions reasonably close to those, not under whatever conditions happen to be available at the factory that week.
Site acceptance testing after installation
Site acceptance testing (SAT) repeats the relevant portions of the FAT protocol after the machine is installed, connected to actual plant utilities, and running production loads, and is the point where the buyer confirms the machine performs to specification under real conditions rather than idealised ones. SAT should include a soak test of at least several consecutive production days rather than a single successful cycle, since intermittent issues, an electrical fault that only surfaces under a specific load combination, a mechanical vibration that builds over hours rather than appearing immediately, tend to surface over a longer run than a one-off demonstration allows.
Punch lists and payment terms
Deviations found during FAT or SAT should be categorised, critical items that block acceptance, major items with a defined remediation timeline, and minor items that can be closed during the warranty period, rather than treated as a single undifferentiated list. Tying a meaningful share of final payment, commonly ten to fifteen percent, to a signed-off SAT rather than to shipment or installation alone gives the buyer real leverage to have punch-list items resolved promptly, and is standard practice among buyers who have been through a difficult commissioning once and do not intend to repeat it. Building a realistic preventive maintenance schedule for the machine's first year should also start from the SAT report, since it is the first accurate record of how the machine actually runs on that site's own utilities.
Quality system frameworks such as ISO 9001 require a documented approach to verification and validation at exactly this boundary between factory output and customer acceptance, and specifying FAT and SAT protocols with the same rigour is one of the more cost-effective forms of risk management available to a buyer before a large capital purchase is finalised.