Commercial Dishwasher Case Study: 12,000 Airline Meals a Day

An airline catering kitchen washes trays, hot-meal containers, cutlery and glassware for flights that leave on a fixed clock. The kitchen needed 12,000 meals a day handled inside one shift pattern, with every rack traceable to a recorded rinse temperature. We supplied a conveyor line with a dedicated pre-wash stage, a final rinse section sized for the audit requirement, and a heat recovery unit to keep hot water inside budget.

Project Snapshot

The Problem: Tray Wash and Plate Wash in the Same Queue

Airline catering is not a restaurant. The ware is a fixed set of tray components arriving in held batches timed to departure slots, and the kitchen will not accept a queue at the end of the flight-preparation lines. Two features made this harder than a hotel or campus kitchen.

The first was the mix. Trays, hot-meal containers, cutlery and glassware all need different handling, and the kitchen did not want two machines, because that means two sets of labour, two chemical feeds and two places to lose a rack.

The second was the record. Because catering is a controlled operation, the kitchen has to show that the final rinse reached its temperature and held long enough for every cycle it ran. A machine that merely washes well is not enough; the evidence has to exist, and it has to be reproducible. Kitchens in this position treat warewashing as a control point in their food safety system, which is the same approach set out in our notes on HACCP-compliant warewashing.

There was also a ceiling on hot water. The facility's boiler capacity was already committed, so the machine had to be efficient to be acceptable.

Why We Chose a Conveyor Line Over Undercounter, Pass-Through and Batch Machines

Undercounter units. Excluded. Capacity per unit is far too low, and buying enough of them would have multiplied labour and chemical dosing points.

Pass-through machines. Excluded. They suit a kitchen where racks are handled one at a time by an operator. At this volume the operator becomes the constraint.

Batch box washers. Excluded. They are excellent for crates and heavy items but do not give the continuous flow trays require.

Conveyor line with heat recovery. Selected. One machine takes the whole ware set, the rinse section delivers the audit requirement, and heat recovery brings hot water demand back inside the boiler's spare capacity.

The Commercial Dishwasher We Built

The line starts with a pre-wash stage that takes the bulk of the food soil off trays before they enter the main wash. Removing soil early keeps the wash tank cleaner for longer and stops heavy grease reaching the rinse section.

The wash tank and rinse section are 316 stainless steel, while the frame and outer panels are 304. That combination was chosen because the tank holds hot water and chemical for the whole shift. The final rinse section is sized so every rack spends enough time under it to meet the kitchen's hold requirement, and rinse temperature is recorded automatically per cycle.

The heat recovery unit captures heat from the exhaust and pre-heats incoming water, which is what allowed the kitchen to specify a machine of this size without a boiler upgrade. We supplied the rack set to match the kitchen's tray dimensions, plus the chemical dosing pumps. Heat recovery is the difference between specifying this line and rebuilding the plant room, and the same principle appears across our heat recovery dishwasher range.

Installation: How the Work Ran

The line was assembled in position across twelve days while the existing warewashing kept running.

Services were the controlling item. Drainage, chemical feeds, water supply and the exhaust connection all had to reach the machine's footprint without crossing a walking route in the kitchen. Commissioning then ran through the actual tray types in the order they arrive from the flight-preparation lines.

Staff training covered loading patterns as much as the control panel, because how racks are spaced on the belt decides throughput more than belt speed does.

Testing and Quality Control

Every machine is run before shipment, with the conveyor, pumps, dosing and rinse section tested and logged. On site, the kitchen's own quality team ran a full shift of production trays to confirm that the record was generated correctly for each cycle.

Rinse temperature was verified with a calibrated probe at each speed setting, and the recorded trace was compared with the manual readings. A separate check confirmed that the heat recovery unit held the incoming water temperature it was specified to deliver.

Results: What the Numbers Show

The kitchen now handles 12,000 meals a day inside a single shift pattern. One three-stage flow takes the whole ware set through a single machine, so racks no longer queue between different pieces of equipment, and the rinse record is produced without anyone writing anything down.

Hot water consumption stayed inside the existing boiler capacity, which was the condition the project was approved on. The kitchen also reports less labour on the tray lines, because one conveyor replaced what would have been several machines and several loading points.

What This Case Means for Your Project

High-volume warewashing is decided by flow, not by wash quality alone. Once the ware set, the peak window and the rinse requirement are fixed, the machine size and the services follow from arithmetic.

If you are planning a central kitchen, a catering facility or a hospital kitchen, send us the tray types, the peak volume and the rinse requirement. Our team will size the line, the tank materials and the heat recovery unit, then quote and ship. You can also review our conveyor options before the layout is frozen, or talk to our project team about the requirements that apply to your market.