Marine Installation Manual 2021-08 4-59
4 Ancillary Systems
4.4 Fuel gas system
X72DF
The design principles of an inert gas release valve are similar to that of a safety
valve. The valve opening section is designed based on the desired flow velocity
and the pressure differential before and after the valve. The valve supplier must
provide a suitable valve for the calculated V
i
and the selected p
i
as well as the re-
sulting purging duration time. Shipyards can consult the supplier of the inert gas
release valve for more details.
Inert gas supply for the main engine is one part of the inert gas supply on the
vessel. Therefore, the inert gas consumption of the main engine must be added to
the ship’s inert gas system during the design phase.
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