How DYNAJET Cleaned a 60-Metre Bunker Silo in One Day
This DYNAJET project shows how bunker silo cleaning can be completed efficiently before recoating. The example explains the different surface conditions, the pressure levels used and why fast, controlled coating removal matters for restoration work.
Efficient bunker silo cleaning for safe recoating
Restoring an ageing bunker silo requires more than removing visible dirt. In this DYNAJET project, the goal was to strip away an old bitumen coating so the silo walls could be prepared for a new protective layer. For operators, contractors and maintenance teams, this kind of work is relevant because silos must continue to meet technical and legal requirements while remaining usable in daily operation.
The silo in question was 60 metres long and 2.60 metres high. Over time, the coating had to protect the concrete from silage juice and groundwater contamination, while also withstanding constant traffic from vehicles filling and emptying the silo. That combination of chemical load, moisture and mechanical wear makes bunker silo cleaning and refurbishment a demanding task. Different wall areas also require different treatment, because the lower section is affected by silage juice and degraded concrete, while the upper section mainly shows weathered coating on still sound concrete.
DYNAJET used a hot- and cold-water high-pressure trailer together with the RDS-Easy 3000-6 rotor nozzle to handle both zones efficiently. On the lower area, hot water at 500 bar helped remove the coating and loose concrete reliably while leaving sufficient tensile strength in the underlying surface. On the upper area, the same nozzle was used at 800 bar to remove the coating completely and slightly roughen the concrete for the next layer. This controlled approach is important in high-pressure cleaning, because it supports both cleaning quality and surface preparation in one process.
For professional users, the practical value lies in matching pressure, water temperature and nozzle choice to the actual condition of the substrate. That reduces unnecessary material removal and helps prepare the silo for recoating in a predictable way. In this case, the entire surface was freed from the old coating within one day, showing how planned high-pressure cleaning can support efficient refurbishment work on large agricultural structures.
Using hot water and rotor nozzles on mixed surfaces
Bunker silo walls often combine damaged and intact areas. Hot water and a rotor nozzle help adapt the cleaning process to each surface condition.
Surface preparation that supports durable recoating
Reliable coating removal is only the first step. The cleaned concrete must still provide the right texture and strength for the new protective layer.
