Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Explosives Use In Decommissioning – Guide for Assessment of Risk (Edgar): I Determination of Sound Pressure Levels for Open Water Blasts and Severance of Conductors and Piles from below the Seabed

Version 1 : Received: 13 July 2021 / Approved: 26 July 2021 / Online: 26 July 2021 (11:59:32 CEST)

How to cite: Brand, A.M. Explosives Use In Decommissioning – Guide for Assessment of Risk (Edgar): I Determination of Sound Pressure Levels for Open Water Blasts and Severance of Conductors and Piles from below the Seabed. Preprints 2021, 2021070573 (doi: 10.20944/preprints202107.0573.v1). Brand, A.M. Explosives Use In Decommissioning – Guide for Assessment of Risk (Edgar): I Determination of Sound Pressure Levels for Open Water Blasts and Severance of Conductors and Piles from below the Seabed. Preprints 2021, 2021070573 (doi: 10.20944/preprints202107.0573.v1).

Abstract

A simple underwater noise model suitable for use with explosives in the decommissioning of oil and gas subsea structures is introduced and evaluated against data from five projects in the US. The performance of the model is compared to four existing models for open water blasts, and for the severance of well conductors and piles. Simulated received underwater sound pressure levels were significantly correlated with measurements for all scenarios. The maximum total error achieved between simulations and measurements was 3.5%, suggesting that predictions are accurate to within 4% of the average measurement. A low relative bias was observed in the simulations when compared to measured values, suggesting only a small systematic underestimate (≤ 1% of average measurement) for most severance operations and a small overestimate (1.34%) for open water blasts.

Keywords

Underwater noise modelling; decommissioning; conductor and pile severance; explosives; sound pressure level

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