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Directive 2000/14/EC of the European Parliament and of the Council of 8 May 2000 on the approximation of the laws of the Member States relating to the noise emission in the environment by equipment for use outdoors
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For the test the hammer is attached to a carrier and a special test block structure shall be used. Figure 28.1 gives the characteristics of this structure and Figure 28.2 shows the position of the carrier
The carrier for the test hammer shall meet the requirements of the test hammer's technical specifications especially in weight range, hydraulic output power, supply oil flow and return line back pressure
Mechanical mounting as well as connections (hoses, pipes …) must correspond to specifications given in the hammer's technical data. All significant noise caused by pipes and various mechanical components needed for installation, ought to be eliminated. All component connections have to be well tightened
The hammer shall be firmly held down by the carrier in order to give the same stability as that existing under normal operating conditions. The hammer must be operated in an upright position
A blunt tool shall be used in the measurements. The length of the tool must meet the requirements given in Figure 28.1 (test block)
Operating conditions of the hydraulic hammer shall be appropriately adjusted, measured and reported along with the corresponding technical specification values. The hammer under test must be used in such way that 90 % or more of the maximum hydraulic input power and oil flow of the hammer can be reached
Care shall be taken that the total uncertainty of the measurement chains of p s and Q is kept within ± 5 %. This assures the hydraulic input power determination within ± 10 % accuracy. Assuming linear correlation between hydraulic input power and emitted sound power this would mean variation of less than ± 0,4 dB in the determination of the sound power level
Pre-settings of all accumulators, pressure central valves and other possible adjustable components must meet the values given in technical data. If more than one fixed impact rate is optional, measurements have to be made using all settings. Minimum and maximum values are presented
p s | The mean value of the hydraulic supply fine pressure during the hammer's operation including at least 10 blows |
Q | The mean value of the breaker inlet oil flow measured simultaneously with p s |
T | The oil temperature must lie between + 40/ + 60 °C during measurements. The temperature of the hydraulic breaker body must have been stabilised to normal operating temperature before starting the measurements |
P a | The prefill gas pressures of all accumulators must be measured in static situation (breaker not operating) at stable ambient temperature of + 15/ + 25 °C. The measured ambient temperature shall be recorded with the measured accumulator prefill gas pressure |
Parameters to be evaluated from the measured operating parameters:
P IN Hydraulic input power of the breaker P IN = p s · Q
p s must be measured as close to the breaker IN-port as possible
p s shall be measured with a pressure gauge (minimum diameter: 100 mm; accuracy class ± 1,0 % FSO)
Q must be measured from the supply pressure line as close to the breaker IN-port as possible
Q must be measured with an electric flowmeter (accuracy class ± 2,5 % of the flow reading)
T must be measured from the oil tank of the carrier or from the hydraulic line connected to hammer. Measuring point shall be specified in the report
accuracy of the temperature reading must lie within ± 2 °C of the actual value
The period of observation shall be at least 15 seconds
The measurements are repeated three times, or more if necessary. The final result is calculated as the arithmetic mean of the two highest values that do not differ by more than 1dB
d | Tool diameter (mm) |
d 1 | Anvil diameter, 1 200 ± 100 mm |
d 2 | Inner diameter of the anvil support structure, ≤ 1 800 mm |
d 3 | Diameter of the test block deck, ≤ 2 200 mm |
d 4 | Diameter of the tool opening in the deck, ≤ 350 mm |
d 5 | Diameter of the tool seal, ≤ 1 000 mm |
h 1 | Visible tool length between the lowest part of the housing and tool seal upper surface (mm), h 1 = d ± d/2 |
h 2 | Tool seal thickness above the deck, ≤ 20 mm (if the tool seal is located below the deck, its thickness is not limited; it may be made of foam rubber) |
h 3 | Distance between deck upper surface and anvil upper surface, 250 ± 50 mm |
h 4 | Isolating foam rubber deck seal thickness, ≤ 30 mm |
h 5 | Anvil thickness, 350 ± 50 mm |
h 6 | Tool penetration, ≤ 50 mm |
If the quadratic shape of the test block structure is used, the maximum length dimension equals 0,89 × corresponding diameter
The empty space between the deck and the anvil can be filled with elastic foam rubber or other absorption material, density < 220 kg/m3
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