construction of inflatable liferafts
the main buoyancy chamber shall be divided into not less than two separate compartments, each inflated through a nonreturn inflation valve on each compartment. The buoyancy chambers shall be so arranged that, in the event of any one of the compartment being damaged or failing to inflate, the intact compartments shall be able to support, with positive freeboard over the liferaft's entire periphery, the number of person which the liferaft is permitted to accommodate, each having a mass of 75 Kg and seated in their normal positions.
The floor of the liferaft shall be waterproof and shall be capable of being sufficiently insulated against cold either
1. by means of one or more compartments that the occupants can inflate automatically and can be deflated and re-inflated by occupants; or
2. by other equally efficient means not dependent on inflation.
4.2.2.3 The liferaft shall be capable of being inflated by one person. The liferaft shall be inflated with a non-toxin gas. The inflation system, including any relief valves installed in compliance with paragraph 4.2.2.4, shall comply with the requirements of an international standard acceptable to the Organization. Inflation shall be completed within a period of 1 min at an ambient temperature of between 18c and 20c and within a period of 3 min at an ambient temperature of -30c. After inflation, the liferaft shall mintain its form when loaded with its full complements of person and equipment.