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Study into noise management in offshore installations

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Information about Study into noise management in offshore installations
Business & Mgmt

Published on February 10, 2014

Author: LREnergy

Source: slideshare.net

Description

Analysis into the causes and solutions to noise and vibration on offshore platforms. Analysis and prevention of noise and vibration helps HSE requirements and reduces risk to staff and employee well-being. Services discussed include:
> Noise prediction
> Outdoor sound propagation studies
> Indoor machinery noise analysis
> Noise insulation analysis
> Vibration studies
> Underwater noise studies
> Structure-borne noise studies

For more information about our services, click here: http://www.lr-ods.com/expertise/noise-and-vibration-control.aspx
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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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