Noise and Vibration Control in Cat-D Offshore Platform construction

Multiconsult Acoustics were contacted late 2012 by the platform owner Songa Offshore, to assist with follow-up of noise and vibration control for four near-identical drilling, intervention and completion platforms being built by DSME in Okpo, South Korea. The owner and yard were having communication difficulties arising in large part because the owner lacked expertise to convince Yard noise experts to do the follow-up and documentation in the desired manner. In the end, Multiconsult participated in the Korean site team for three years, helping to bring the project to a successful conclusion, with ensuing swift approval by the Norwegian authorities (PSA). Advantage to the Owner: assurance of effective communication and follow-up of Yard activities and documentation. Yard benefit: a qualified cooperation and discussion partner. Multiconsult engineers have benefited the project and gained experience through an interesting project. Early intervention assured documentation according to PSA expectations. Challenges were detected early and largely rectified, prior to rig handover. PSA on-site and post-delivery audits were supported. Verification activities included FAT, commissioning and Sea Trial noise tests and sound insulation measurements. The paper presents details.