Mechanical lifting failures - OGP

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RADD – Mechanical lifting failures Abbreviations: BOP DNV HSE QRA UKCS WOAD Blowout Preventer Det Norske Veritas (UK) Health and Safety Executive Quantitative Risk Assessment (sometimes Analysis) United Kingdom Continental Shelf World Offshore Accident Databank ©OGP
RADD – Mechanical lifting failures 1.0 Introduction 1.1 Application This datasheet presents information on the frequency of dropped objects resulting from the failure of lifting devices on offshore installations. Specifically it includes dropped load frequencies for the following types of lifting equipment: 1. Main cranes 2. Drilling derrick 3. Other devices The data are derived from offshore operating experience in the UKCS over the period 1980 to 1999. The data are intended to be applied in quantifying the risks from lifting operations worldwide. Consideration should be given to factoring the data up or down where there is reasonable justification that the management of lifting operations is significantly poorer or safer that UKCS operations. 1.2 Definitions • Dropped loads Refers to loads (objects) either unintentionally released from a lifting device or else swinging and impacting some part of the installation structure (or vessel, if the lift is to/from a vessel). • Lifting devices Main crane, derrick main hoisting assembly, and other lifting devices (see below). • Other lifting devices • Mobile Installations • Fixed Installations BOP cranes, gantry cranes, tuggers, and a range of portable devices, e.g winches, sling blocks, wirelines. The data for mobile installations are gathered almost entirely from experience in the operation of mobile offshore drilling units (MODUs). These include semi-submersibles, jackups, and drill ships. The data for fixed installations are gathered from a range of types of production installation ranging from integrated platforms to wellhead platforms. The data also include experience from FPSOs (floating production, storage and offloading vessels) and FSUs (floating storage units). “Main cranes” and “drilling derrick” referred to in Section 1.0 are considered self explanatory. 2.0 Summary of Recommended Data Dropped object probabilities per lift on offshore installations are tabulated below for mobile installations and fixed installations, for different load weights and by lifting device (main crane, drilling derrick, or other device). The data represent the probability of a dropped object per lift. Estimation of the dropped object frequency combines the probability of a dropped object per lift with the number of lifts carried out (for example, per year if the annual risk is required). Note that, for drops from the main crane, in general the frequency in the Total column is not the sum of the Installation, Sea and Vessel drop frequencies in the same row because not all main crane lifts are between vessel and installation (some are across ©OGP 1
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