Spotlight

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):

Broadband insertion loss ΔSEL [dB]
SystemkonfigurationΔSEL [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