27 / 60
11–15 dB
(
A
)
Complete isolation obtained
without the drawbacks of
Brunvoll 1st generation.
Brunvoll’s superior
technology is recognized by
leading regulatory bodies.
Good
Tailored to hull structure
and hull lines.
Complete delivery with
no assembling at yard.
5–9 dB
(
A
)
Acoustic short circuiting
via water outside seals.
Less good
Outer seals less well
protected.
Poor serviceability.
Good
Seals and mounts are
well protected with good
serviceability.
Unmatched ease
of inspection.
Less good
Tailored to hull lines.
Structural integration
less good.
Assembling at yard.
11–15 dB
(
A
)
Complete isolation
obtained.
Poor/Less good
Outer seals exposed /
vulnerable to damage.
Poor
Requires a plane hull
surface at tunnel ends.
Structural integration
less good.
Assembling at yard.
5–6 dB(A)
The source is not
completely isolated.
Noise emission from
non-isolated part of
tunnel is decisive.
Less good
Outer seals less well
protected.
Poor/Less good
May be tailored to
hull lines, but structural
integration and ease of
installation is poor.
Assembling at yard.
Noise
reduction:
Safety
aspects and
serviceability:
Structural
integration and
installation:
27