Interesting facts


about high-pressure water blasting

The questions around high-pressure water blasting are varied, and there is no broad answer, generally speaking. Nevertheless, we have tried to answer frequently asked questions or to illustrate how broad the spectrum is. We would be happy to advise you on a personal and project-specific basis.

The water consumption is case-by-case and can vary significantly. Dependent factors include the required volume flow and the intended activation time.

  • Hand lance requirements: (min. 2.0 bar) Water requirement approx. 2 m³ / hour of operation
  • Robot requirements: (min. 4.0 bar) Water requirement approx. 15 m³ / hour of operation

We would be happy to advise you to determine your project-specific requirements.

Concrete cutting is even more individual than water consumption. This depends on the size of the individual areas to be processed, on the working environment and the type of structure, the cutting depth, the reinforcement, the aggregate grain, the concrete strength, etc.

Mechanical cutting can achieve 1 – 10 m³ per day and manual cutting equipment 0.1 – 1.1 m³ per day.

We are happy to discuss these parameters with you personally.

Change in labelling of water meters according to the European Measuring Instruments Directive (MID).
New labelling
DThe new labelling comprises the CE mark, the metrology mark “M”, the year the label was affixed and the identification number of the authority responsible for the conformity assessment procedure to be conducted with the manufacturer, as designated by the Federal Ministry of Economics.
New designation of characteristic flow rates
The previous designations for the characteristic flow rates have changed, and the flow rate ratios have been redefined. This allows a better display of the actual achievable performance data of the meters.

Previous designationnew according to MID
Minimum flow rate: QminMinimum flow rate: Q1
Transition flow rate: QtTransition flow rate: Q2
Nominal flow rate: QnContinuous flow rate: Q3
Maximum flow rate: QmaxOverload flow rate: Q4


In this respect, the meter designation also changes: → Qn (nominal flow rate) becomes Q3 (continuous flow rate) → e.g. Qn 2.5 becomes Q34

Redefined service areas
The new Q3 values and the new flow rate ratios Q2:Q1 and Q3:Q4 also alter the lower and upper load range. The calibration period for water meters remains the same.

Meter size 
75/33/EC  (previously)
logical class
Qn 2,5B502005
Qn 6B12048012
Qn 10B20080020
Qn 15B120300030

Meter size
2004/22/EC  (new)

Q3 4R8050805
Q3 10R8012520013
Q3 16R8020032020
Q3 25R8031350031

In principle, the robot is very versatile; however, there are both technical and economic criteria that should be noted.

Our standard robots weigh approx. 1.5 t and this weight must be supported by the substrate. Furthermore, the condition of the substrate must allow the use of a robot, i.e., it must be firm (even with the accrual of process water) and as flat as possible. The minimum clearance width and height must also be guaranteed.

From an economic perspective, there are specific individual field sizes to be considered, depending on the cutting depth and a minimum volume (> 6 m³) per construction site equipment, in order to achieve the desired removal rate and to arrange deployment in a practical way for all those involved.

Depending on options and local circumstances, the waste material can be swept up and then collected manually or by Bobcat.

Where local circumstances allow and suitable protective measures are available for the surrounding installations or other parts, the cutting material can also be rinsed with a C-hose.

The cutting material can also be extracted from the processed surfaces, for example, using a suction vehicle.

To allow us to start work directly, the following on-site services must be rendered by you. See: On-site service

Protective measures must be performed subject to local circumstances and legislation. In closed working areas such as underground garages, the fixed installations and areas that shall not be replaced or restored should be protected from contamination and flying waste material. If areas are still in use during renovation works, these must be structurally separated and protected from jettisoning concrete parts.

If work areas are directly adjacent to existing passenger or motor traffic, particular attention should be paid to ensuring that no persons or objects are injured or damaged by jettisoning waste material. For example, with a protective net around the work area and additional vertical reinforcements such as timber struts.

The requirements and on-site options are multiple and varied; we are happy to provide in-depth advice.

Still have questions

... or are our explanations unclear? Then, we are available to advise you over the phone.

We look forward to receiving comments and suggestions on how to expand and improve this category.

Telephone: +49 (0) 3693 / 94 03-0

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Would you like advice or information, or do you have a query for Wannenwetsch? We look forward to hearing from you.

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