Canada Oil and Gas Installations Regulations — 59
59 (1) The boundaries of watertight compartments in a floating platform shall contain no more openings than necessary for the operation of the platform and, where penetration of those boundaries is necessary for access, ventilation, piping and cables or any other similar purpose, arrangements shall be made to maintain the strength and watertight integrity of the boundaries. (2) Every watertight boundary and associated closing appliance on a floating platform shall be of sufficient strength and tightness of closure to withstand without failure the pressure and other loads likely to occur in service. (3) All watertight doors and hatches on a floating platform shall be operable locally from both sides of the associated bulkhead or deck. (4) Side scuttles and windows on a floating platform shall be of the non-opening type, fitted with internal hinged deadlight covers. (5) All pipes and ducts on a floating platform shall, where possible, be routed clear of those compartments that are vulnerable to penetration damage or, where such routing is not possible, positive means of closure of those pipes and ducts shall be provided for each watertight boundary. (6) Every valve required at a watertight boundary on a floating platform shall be remotely operable from the ballast control station or by a mechanical means from another readily accessible position that is above the waterline in the final condition of equilibrium that could result when the platform is in a damaged condition. (7) Every inlet or discharge port on a floating platform that is submerged at maximum operating draught shall be fitted with a valve that is remotely controlled from the ballast control station, and each such valve shall close automatically when the source of power fails, unless safety considerations require that it remain open. (8) Every discharge port on a floating platform that penetrates a boundary to a compartment intended to be watertight shall be fitted with an automatic non-return valve and with a second such valve or with a device whereby the port may be closed from a position outside and above the compartment. (9) Every door or hatch on a floating platform used to ensure the watertight integrity of internal access openings during the operation of the platform shall, while the platform is afloat, be equipped with an indicator at the ballast control station to indicate whether the door or hatch is open or closed. (10) Every door or hatch on a floating platform that is normally closed while the platform is afloat shall be equipped (a) with an alarm system that is triggered in a manned control station when the door or hatch is open; and (b) with a notice affixed to that door or hatch cover to the effect that the door or hatch cover is not to be left open while the platform is afloat. (11) All external openings on a floating platform, except manholes that are fitted with close-bolted watertight covers and that are kept permanently closed while the platform is afloat, shall, in the intact condition or in a damaged condition, be completely above any waterline associated with the platform being heeled because of wind forces. (12) Every external opening on a floating platform that becomes wholly or partially submerged when the platform is at the maximum angle of heel that could occur while the platform meets the area ratio requirement for intact and damage stability set out in the Code referred to in subsection 57(9) or that may become intermittently submerged because of wave action when the platform is in a damaged condition shall (a) be designed and constructed to withstand any sea condition without penetration; (b) in the case of an opening that may become intermittently submerged when the platform is in a damaged condition, (i) close automatically when submerged, (ii) be readily and quickly closable at any time, or (iii) be assumed to be open in the damage stability calculations made pursuant to section 57; (c) in the case of an external opening that cannot