Trans RINA, Vol 157, Part A3, Intl J Maritime Eng, Jul-Sep 2015
Table 7. Noise levels on different types of vessels. Source: DNV Type Ship
Ship’s Group
Aft Superstructure Tanker Carrier A1 /turbo
Bulk Carrier A2>50000 TPM
OBO A3>5- 10000TPM
LPG/LNG A4>1-5000 TPM
General Cargo A5>50000 TPM
Container Ship A6<1000 TPM
¾ Aft superstructure
Fore superstructure
Reefer
Container Ship Ro-Ro
Container Ship General Cargo Offshore
Cruise Ships Ferries
As for the noise levels of the wheelhouse, the limit recommended by the IMO of 65 dB(A) is once again not met by tugs when manoeuvring or in small container ships. In general, there seems to be no problem in these spaces.
Table 8. Summary with maximum noise levels
different spaces, in all constructions. Ro - Pax Vessels (<200 m)
78/ 79
Engine Room
Engine Control Room
Wheelhouse Cabins
Recreation areas Workspaces
80 81 86
64 65 61 61 55 53 -- 61 60
74 61
Juan J.
Sister
105 105 105 110 109 85 70 68
71 54
70 71
The value recommended by the IMO for
59 79
86 85 84 90 92 the engine
control room is 75 dB(A), which is not met in low tonnage ships, such as tugs, general cargo vessels of below 5,000 dwt or Ro-Ro vessels. This may be because there is no control room separated from the machinery spaces on the majority of these small tonnage vessels.
Finally, the noise levels in the engine room exceed 100 dB(A) in almost all vessels. The only vessels found
A-142 5. CONCLUSIONS
By requiring shipyards to make a predictive calculation of noise in the design phase of new construction ships in the areas of the vessel that must comply with noise levels stipulated in the fourth chapter of the Code, the new IMO Code involves a significant change in the traditional treatment of noise and vibration on board on the part of shipbuilders.
Furthermore, this Code requires the drawing up of a final noise report, which must be deemed satisfactory before delivery of the vessel to the ship-owner. In our opinion, noise levels on board should be checked on a periodic basis, and not just on completion of construction.
The new regulatory requirements being introduced by the European Union on noise radiated to the outside and underwater radiated noise will also make noise and vibration critical in the design of new ships. This will
©2015: The Royal Institution of Naval Architects in
within a range whose lower limit is below 100 dB (A) are those powered by turbines
(currently a very small
number of vessels with respect to the world fleet) and bulk carriers of 50,000 dwt and above.
f) Summary of noise levels on Ro-Pax vessels [21] (data from LAV, Cadiz). Measurements made by the Acoustics Laboratory
(Spanish acronym, LAV),
University of Cádiz, were primarily used to prepare Table 8.
B C
D Traffic
Tugs 81 75 Passenger ships
Manoeuvring
107-112 80 62 105-110 75
75/45
Cabins Under
Superstructure 2
95-100 69 -- 96-108
72
100-110 73 103-110 76 103-110 80 105-110 --
100-110 75 -- 105-110 78 --
65 66
67 69 71 75 67 60
61
Over Superstructure
1 A B C D
57 54 50 48 56 65 70 60 57 54 51 59 69 70
62 59 56 53 61 71 75 64 61 58 55 63 73 75 66 63 60 -- 65 75 80 70 67 -- 69 79 -- 60 57 55 53 60 70 75 55 52 49 47 57 65 70
58 55 -- -- 63 79 -- 69
63 66 79 71/43 66/4862/4356/42 54/39 55 65 70
Engine Room Control Room
Deck Bridge
Bridge Wings Areas of outdoor
recreation
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