Single or double Big Bubble Curtain (BBC / DBBC)
- air-water-mixture (impedance difference)
- far-from-pile Noise Abatement System
- applications until 40 m and pile diameters of ≤ 8,0 m
several hundred offshore applications
The noise reduction is dependent of:
- air volume
- current (until max. 0.75 m/s)
- water depth
- nozzle hose configuration and -length
- number of nozzle hoses
- offshore experience and maintenance status
Advantages:
- independent of foundation structure
- independent of the installation vessel
Disadvantages:
- separate vessel and compressors
- offshore logistics with vessels
- resulting noise reduction strongly depends on the system configuration
requires project-specific optimization at the beginning of each construction project
Offshore-suitable Noise Abatement System.
Achieved noise reduction for the Sound Exposure Level (SEL resp. LE):
Systemkonfiguration | ΔSEL [dB] |
---|---|
Single Big Bubble Curtain - BBC (> 0,3 m3/(min*m), water depth < 25 m) | 11 ≤ 14 ≤ 15 |
Double Big Bubble Curtain - DBBC (> 0,3 m3/(min*m), water depth < 25 m) | 14 ≤ 17 ≤ 18 |
Single Big Bubble Curtain - BBC (> 0,3 m3/(min*m), water depth ~ 30 m) | 8 ≤ 11 ≤ 14 |
Single Big Bubble Curtain - BBC (> 0,3 m3/(min*m), water depth ~ 40 m) | 7 ≤ 9 ≤ 11 |
Double Big Bubble Curtain - DBBC (> 0,3 m3/(min*m), water depth ~ 40 m) | 8 ≤ 11 ≤ 13 |
Double Big Bubble Curtain - DBBC (> 0,4 m3/(min*m), water depth ~ 40 m) | 12 ≤ 15 ≤ 18 |
Double Big Bubble Curtain - DBBC (> 0,5 m3/(min*m), water depth > 40 m) | ~ 15 – 16 |