Define what counts as a wash
Feed tankers are not ordinary trucks. Bulk feed dust, fines and oil work their way into every seam of a hopper, absorb moisture and cake into a crust that will not shift under a casual rinse. Fleets wash them anyway, because leftover residue carries the previous load into the next one, and in feed transport that is a biosecurity and quality problem. The difficulty is that tanker washing is one of the thirstiest jobs in a transport yard, and most teams have never measured it. Before water use can be reduced, it has to be assessed. Here is a practical way to do that.
Start with a definition, because most arguments about water use collapse before they begin: nobody has agreed on what a wash is. Write down the actual procedure. Does it include a pre-rinse, a detergent dwell, a main wash, a final rinse and a disinfectant pass? Are the interior hopper walls, the exterior body, the chassis and the wheels all in scope? A water figure is meaningless unless every wash is measured against the same written procedure. A standard operating procedure also makes it possible to compare crews, shifts and equipment later without the comparison turning into a dispute.
Measure the baseline before changing anything
You cannot manage a number you have never seen. The reliable method is a flow meter or totaliser on the wash line. If the yard does not have one, there are two workarounds that cost almost nothing:
- Read the site water meter before and after a wash session, then divide by the number of tankers washed.
- Measure nozzle output directly: collect the flow from each lance or hose into a bucket for sixty seconds, note the litres per minute, and time the running hours with a stopwatch.
Record the result per vehicle and per wash, not just as a monthly site total. A monthly figure hides the problem; a per-wash figure shows it.
Break the number down by stage and surface
Water is almost never spent evenly. In tanker work the final rinse usually takes the largest share, and the interior hopper, where dried feed residue bonds to the steel, takes far longer than the exterior. Log the running time of each stage over a handful of washes. This breakdown usually reveals two things: the rinse is running far longer than it needs to, and the hose is left running while nobody has a wand in hand. Both can be fixed without buying any equipment at all.
Track metrics that reflect reality
Once a baseline exists, keep a simple log: litres per wash, a monthly total, and the soil condition the tanker arrived in, whether that is caked residue, loose dust, or a routine rinse after a clean load. Soil condition is the variable that ruins most comparisons. A sharp drop in one week’s figures means nothing if the tankers the week before arrived far dirtier. Watch trends across weeks rather than single washes, and investigate any wash that sits well outside the pattern instead of quietly filing it away.
Compare cleaning methods, not just nozzles
Most yards try to save water by fitting trigger guns or low-flow nozzles. The saving is real but small. The larger difference comes from changing the method. Pressure washing uses less water than an open hose because pressure does the work that volume used to do. Steam goes further still: it converts a small quantity of water into high-temperature, high-pressure cleaning energy, so the machine runs from a small tank and leaves minimal runoff behind. The PowerDe HW02 fixed steam unit, for example, is built around an 80-litre stainless steel tank and produces steam at 160°C and 0.8 MPa, enough to loosen caked organic residue without flooding the bay. When evaluating low-water steam cleaning equipment, ask suppliers how much water a full cycle consumes, not only what the machine can remove.
Choose equipment with the whole task in mind
When comparing animal feed tanker cleaning equipment, score the options on three things: water use per cycle, whether the machine can actually reach the interior geometry of your hoppers, and whether it can run where your fleet is washed. Many yards have no industrial power at the wash pad, and fixed units such as the HW02 operate on a standard 220 V supply. A machine that fits the yard and uses less water will always beat a larger machine that gets skipped because it is awkward to set up.
Do not forget the wastewater side
Water use and wastewater are the same number viewed from opposite ends. Every extra litre that enters the wash becomes runoff that the yard must collect, screen and treat before discharge, and wash water carrying feed residue, oil and detergent is not rainwater. Reducing water at the source is easier than managing it at the drain, and it keeps discharge volumes inside permit limits without new treatment equipment.
Common pitfalls
- Measuring the pre-rinse only, and ignoring the final rinse that carries most of the volume.
- Comparing crews or shifts without controlling for soil condition.
- Counting the wash line but ignoring softener regeneration cycles and leaking valves, which quietly add to the total.
- Assuming extra detergent means less rinsing. Chemical residue usually demands more rinse water, not less.
Start with the number you already have
Assessing water use when cleaning feed tankers is not complicated: define the procedure, measure per wash, break the figure down by stage, and track it honestly over time. Once the numbers are on paper, the path forward usually becomes obvious, and it tends to start with shorter rinse times and no running hoses, followed by a method that uses heat and pressure instead of volume. If your team is comparing feed transport truck washing machine options, begin with a measured baseline. It is the cheapest tool in the yard, and every decision that follows is easier to justify.
