Published on February 10, 2014
Lloyd’s Register services to the energy industry Noise Management in Offshore Installations Daniel Alvarez, M.Sc. Senior Consultant, Energy Lloyd’s Register November 11-14, 2014 Adipec
Lloyd’s Register services to the energy industry Noise • Source of: stress, high blood pressure, headaches, tiredness, reduction of work efficiency, hearing loss • May be fatal if personnel cannot hear instructions or alarms. • Impacts: (1) comfort, (2) working conditions and (3) environment Offshore Installations • Compact environment with large amount of noise and vibration sources • Structure-borne noise play an important role in steel-type structures • Indoor controlable climate is often required • Limited space and weight for noise control measures • Movable facilities may want to comply with regulations globally November 11-14, 2014 Adipec
Lloyd’s Register services to the energy industry Successful Noise Management through... • Understanding the targets • Dialogue contractors - vendors • Find optimal combination of noise control measures • All based on Reliable Noise Predictions at early design stage Value • Substantial reduction of cost • Enhance reduction by tailoring control measures to specific design • Minimize risk of expensive retroactive noise control November 11-14, 2014 Adipec
Lloyd’s Register services to the energy industry Noise Prediction Package often includes... FWD 11 108-110 10 Shearing Tank 9 98-100 Shearing Tank 6 Noise at indoor machinery areas 5 Triptank Pumps • Evaluation of HVAC Noise • Vibration studies • Underwater noise study “The matter is not only to operate them, but to choose the right tool for specific applications” November 11-14, 2014 Adipec 94-96 92-94 4 90-92 86-88 84-86 Clean Tank Centrifuge Tank Degasser Tank 3 2 82-84 80-82 78-80 1 76-78 74-76 0 0 Structure-borne noise study 96-98 88-90 Desilter Pumps Sand Trap Tank Triptank Noise Insulation Analysis • 100-102 7 Catch Tank • Outdoor sound propagation study 102-104 8 Y (Meter) • Vacuum Unit Desilter Tank • 106-108 104-106 Slurry Tank Skimmer Tanks 1 2 3 4 5 6 7 8 9 10 X (Meter) 11 12 13 14 15 16 17 18 72-74 70-72
Lloyd’s Register services to the energy industry Outdoor Sound Propagation Study • Focus on working conditions • Identifies problem areas and warning signal locations • Requires knowledge about oil & gas machinery and its noise and vibration characteristics (database) • Can be used during the entire life cicle for HSE purposes (requires regular updates) • Allows the evaluation of noise control measures November 11-14, 2014 Adipec
Lloyd’s Register services to the energy industry Noise at Indoor Machinery Areas • Focus on working conditions • Identifies problem areas and warning signal locations • Requires database of machinery noise and vibration characteristics as well as indoor environment properties (Absorption or T60) November 11-14, 2014 Adipec
Lloyd’s Register services to the energy industry Noise Insulation Analysis • Focus on Accommodation Blocks and sensitive areas in noisy environments (control rooms) • Noise transmission from outdoors as well as noise transmission amongst indoor spaces • Requires knowledge about material properties (often based on empirical information) Lp,1 November 11-14, 2014 Adipec Lp,2 = ?
Lloyd’s Register services to the energy industry Structure-borne Noise Study • Focus on Accommodation Blocks • Requires source strength (energy to structure) • Requires information about how the energy propagates in the structure (empirical or statistical) • Requires knowledge in regards to material damping (often flooring) Lv4 LW4 Lv2 L2W LW3 Lv3 LW1 Lv1 November 11-14, 2014 Adipec
Lloyd’s Register services to the energy industry Evaluation of HVAC Noise • Focus on Accommodation Blocks and often affecting working conditions too • Noise is generated through supply and return ducting (silencer up and downstream) • Silencers are often cheap solutions but often forgotten creating a space issue • Empirical information about pressure-drop control devices is often required November 11-14, 2014 Adipec
Lloyd’s Register services to the energy industry Vibration Studies • Deterministic analysis of supporting structure • The output refers structural modifications to suit requirements • Often conducted only for major equipment Excitatio n points: November 11-14, 2014 Adipec
Lloyd’s Register services to the energy industry Vibration Studies (2) • Coarse evaluation of suporting structure • Selection of anti-vibration mounts as per machinery characteristics • Database of anti-vibration technology plays an important role November 11-14, 2014 Adipec
Lloyd’s Register services to the energy industry Underwater Noise Study • The effect of piling of offshore platforms 180 10 170 Depth [m] 30 160 50 150 140 70 Seabed 130 90 1 November 11-14, 2014 Adipec 2 4 3 Range [km] 5 6 7 120 Overall SEL (dB re 1µPa2⋅s) Source
Lloyd’s Register services to the energy industry Underwater Propagation Modelling Water-filled pile Water Water Acoustic Finite Element Model of untreated pile vs single-wall cofferdam Snapshot at 19 ms Cofferdam Hammer energy 1890 kNm/kJ Seabed Seabed Pile length/diameter: 45 m / 5.4 m Water depth: 25 m Cofferdam: 50 mm steel, 900 mm air gap November 11-14, 2014 Adipec
Lloyd’s Register services to the energy industry Conclusions • Noise may cause significant costs in your project • Noise may generate considerable damage to your employees • Theoretical and empirical information in regards to noise and vibration charateristics of machinery, as well as material noise insulation properties play an important role during the design • Noise and vibration prediction tools help to evaluate your asset. The matter is not only to operate them, but to choose the right tool for specific applications • The earlier noise is considered, the better! November 11-14, 2014 Adipec
November 11-14, 2014 Adipec
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