Find the resource that ends useful sweeping first
A shift may stop for water, debris mass or occupied hopper space. Light bulky leaves and dense wet material can reach different limits. Keep water use, recovered mass and elapsed time as separate inputs from operator records or a representative trial.
Account for travel, queues, access and service time at refill and disposal sites. A larger nominal volume helps only if that resource limits useful work and the completed truck can carry it. Extra water can reduce the mass available for debris.
Compare the route stages with gross and axle limits
Bucher’s water, hopper and payload relationship is a planning framework, not a capacity target for another truck. Review changing water and debris loads through the shift, and identify what each quoted volume measures.
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| Decision | What to establish | Condition or limit |
|---|---|---|
| Hopper volume | Ask what the stated capacity measures and how usable collection volume is defined for the offered body. | A nominal geometric volume does not establish how much of the route debris can be collected before discharge. |
| Debris mass allowance | Review the loading schedule with water, fuel, crew, tools and options, including relevant stages of the shift. | Gross and individual axle limits can govern before hopper volume is used; check both with the vehicle supplier. |
| Water endurance | Use trial water consumption under the agreed sweeping conditions to estimate the interval to replenishment. | Pump maximum flow is not average route consumption, and a larger tank can reduce available debris payload. |
| Water recovery options | Identify any quoted recirculation equipment and its cleaning, service and operating requirements. | Do not assume recycled water replaces all fresh water use or that another manufacturer option is installed. |
| Service-stop time | Include travel, access, queuing, refill or discharge and return to the interrupted route. | A nearby site may still be unusable because of opening hours, vehicle clearance or receiving restrictions. |
| First limiting resource | Compare time to water refill, mass limit and hopper fill for each representative route case. | Increasing a capacity that is not limiting the route may add mass and cost without extending useful work. |
| Shift estimate | Start from the available shift and subtract transit, service stops, breaks and required cleaning before estimating sweeping time. | Convert that time to cleaned route only with a demonstrated speed and collection width at the accepted result. |
Build the estimate from measured consumption and service stops
Request usable-volume definitions, the load schedule and any installed water-recovery equipment. Compare time to each limiting resource, then include service travel and cleaning before estimating cleaned route length.
Information to prepare for this review
- Shift length and planned route sections, with working and transit time separated
- Representative debris volume and measured mass where available, including seasonal wet loads
- Completed-vehicle mass, axle ratings, crew, tools, fuel and installed options
- Quoted usable water capacity and water-use evidence at the required cleaning result
- Refill and disposal locations, access hours, queues and round-trip travel time
- Hopper discharge clearance, receiving arrangement and restrictions at the disposal site
Records to request and keep
- Supplier definition of hopper and water capacities, with configuration drawings
- Completed mass and axle-load records for the agreed representative loading cases
- Trial worksheet recording start/end water, collected mass where measured, hopper fill and elapsed time
- A route map showing refill and disposal access rather than distance alone
- Shift calculation with the governing constraint and all unmeasured assumptions labelled
- Comparison of capacity alternatives using the same chassis, equipment and duty assumptions
- Confirmation that the disposal facility can accept the truck and the intended collected material
Common mistakes and what to check instead
- Buying the largest hopper in the comparison: Identify whether volume, mass, water or service travel actually limits the shift.
- Subtracting empty chassis mass from gross weight to claim debris payload: Use the completed sweeper with its operating supplies, crew and options, and check axle distribution.
- Counting only the minutes spent refilling: Add the complete diversion and return time, including predictable site queues.
Scope of this guide
Capacity planning requires the exact truck mass schedule and destination loading requirements.
Illustrative debris cases do not assign a density, collection rate or shift output to KEEYAK equipment.
A trial result is conditional on its recorded settings, debris, surface and weather; revise planning inputs when those change.
Sources and applicability
OEM example of vacuum sweeping and the balance between hopper, water and payload. Capacity, pickup, particulate and option claims apply only to the referenced model.
Does not establish: It applies to the named manufacturer example and does not establish a KEEYAK model rating or project result.