The danger of the accident occurrence for offshore units and support vessels (such as petroleum, petroleum gas and natural gas production facilities) is considerably high, because of hazardous gas, explosive gas, flammable material and so on. Also the importance of the ocean development have been increased recently, and the petroleum development which is buried at the very deep sea have been realized. Then the risk have been enlarged gradually with the scale of the facilities for petroleum production, separation and purification.
Such offshore units and vessels have been applied various regulations such as international standards, rules, practices, etc.
In the case of naval ship, the countermeasure about the nuclear, biological and chemical warfare is desired more.
The equipments to remove such danger is safety ventilation system. However, the technology and regulations about the safety ventilation system are not equiped sufficiently in the domestic.
Therefore this paper arranged the result of the review about the various rules, standards and guidances for safety ventilation systems, and analyzed the example of the vessels to be built.