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Section 2 Design Principles
201. Design principles
1. For the purposes of this Rule, rescue appliances include all systems and equipment for recovering the submersible and rescuing its occupants, including in particular:
(1) Emergency gas supply for blowing the diving tanks
(2) Jettisonable ballast
(3) Marker buoy and recovery line and Mating flange for rescue submersibles
2. The supply of air to be carried on board is specified in Ch 9, Sec 2.
3. Mathematical proof is to be furnished that, after release of the hard ballast, the submersible rises safely to the surface and floats there in a stable position. It shall be possible to release the hard ballast even if the electricity supply fails. The devices for jettison of ballast are to be so designed that two mutually independent actions have to be performed to initiate the release operation.
4. The marker buoy of a submersible (cf. also Ch 4. Sec 4.) shall, where appropriate, be fitted with a recovery line with which, in an emergency, an emergency salvage line can be fastened to the submersible to enable it to be brought to the surface.
5. Where the submersible is provided with a mating flange for a rescue submersible, the relevant de- sign parameters and calculations are to be agreed with the Society in each case.
6. A device is to be fitted for the automatic blowing of the diving tanks. This shall be actuated auto- matically unless, at the expiry of a safety interval, a safety switch (dead man's handle) is actuated, or if the maximum permissible diving depth is exceeded. This device is to be automatically ren- dered unoperational when the diver's lockout is open.
