Canada Oil and Gas Installations Regulations — 55
55 (1) Every floating platform that is intended to be used in areas in which sea ice is present shall be able to (a) withstand, without major damage, the ice loads to which it may be subjected when it is operating in accordance with the operations manual; (b) stay on location in the ice concentration and under the ice forces to which it may be subjected, as stated in the operations manual; and (c) be moved from the production site or drill site in the ice concentration to which it may be subjected, as stated in the operations manual. (2) In an analysis undertaken in accordance with subsection 37(2) for the purpose of determining the resistance to overturning and the resistance to sliding of a self-elevating mobile offshore platform, (a) a lattice type leg may be analysed using equivalent single- beam hydrodynamic coefficients as determined in accordance with Det norske Veritas Classification Notes, Note No. 31.5 — Strength Analysis of Main Structures of Self-Elevating Units , when determining (i) the hydrodynamic loads to be used in calculating overturning forces and sliding forces, if a vertical load equal to 5 per cent of the horizontal load is applied at the centre of the leg, and (ii) the hydrodynamic forces to be used in any detailed finite element analysis of the upper legs and hull; (b) the overturning moments and sliding forces shall be assessed assuming no spudcan fixity and using the most critical combination and direction of environmental and functional loads; (c) the reaction point for an independent leg platform shall be taken as the point located at a distance above the spudcan tip that is equal to the lesser of (i) half the height of the spudcan, and (ii) half the total penetration; and (d) the reaction point for a mat-supported platform shall be determined considering the soil characteristics determined in the site investigation undertaken pursuant to section 46. (3) Where any wave frequency or seismic ground motion predicted for the production site of a self-elevating mobile offshore production platform is close to the frequency of oscillation of the platform, a dynamic response calculation shall be performed as part of the analyses required by section 37 and the dynamic loads determined thereby shall be included in the relevant stress and fatigue analyses. (4) The connection between each spudcan and each leg of a self-elevating mobile offshore platform shall be designed to withstand without failure the loads occurring at the full spudcan fixity condition. (5) Each spudcan and each connection between each spudcan and each leg of a self-elevating mobile offshore platform shall be designed for all possible penetrations or conditions ranging from tip penetration to full spudcan penetration as determined by the site investigation undertaken pursuant to section 46, and the shape of the spudcan. (6) Every spudcan of a self-elevating mobile offshore platform shall have sufficient strength to withstand storm-induced horizontal loads, vertical loads, and one half of the lower guide bending moment that is calculated assuming the leg is pinned. (7) The secondary bending effects of the legs of a self-elevating mobile offshore platform shall be taken into account in the performance of an analysis pursuant to section 37. (8) The analysis required pursuant to section 37 to verify whether a self-elevating mobile offshore platform is capable of withstanding the loads imposed during transportation shall be performed in accordance with Part 3, Chapter 2, Sections 3 C-100 and D-300 of Det norske Veritas Rules for Classification of Mobile Offshore Units . (9) A self-elevating mobile offshore platform with independent footing support shall be designed to withstand the loads that may be imposed during preload operations, including where there is (a) loss of foundation support for one leg for a distance of at least 4 m; and (b) offset support of 1.5 m from the centre of the spudcan tip. (10) The legs, spudcans and mats of every self-