Clarification of Hazardous Areas Applied to Newly Developed Liquefied Hydrogen Carrier
- Shuntaro Unno (Kawasaki Heavy Industries, Ltd.) | Tomoaki Umemura (Kawasaki Heavy Industries, Ltd.) | Hiroaki Kagaya (Kawasaki Heavy Industries, Ltd.) | Yukichi Takaoka (Kawasaki Heavy Industries, Ltd.)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- IEC, Liquefied Hydrogen (LH2) Carrier, Gas dangerous zone, IGC Code, Hazardous area, Liquefied Hydrogen, Liquefied Natural Gas (LNG) Carrier
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A hazardous area also known as a gas dangerous zone in the IGC Code (IMO, 2016) is an area in which an explosive gas atmosphere is, or may be expected to be present, in quantities that require special precautions for construction, installation and use of electrical equipment. The areas can be classified by different hazardous levels as three zones regardless of the property differences of liquefied gas. For our newly developed Liquefied Hydrogen (LH2) Carrier, it is helpful to require a re-examination of the extent of each hazardous area for explosive gaseous hydrogen atmosphere taking the different properties of hydrogen and natural gas (methane) associated with hazard into consideration.
In this paper, the validity of hazardous area defined by the IGC Code was clarified for our developed LH2 Carrier by using gap analysis between the IGC Code and the guidelines in IEC 60079-10-1 Ed.2 2015-09 (IEC, 2015), which stipulate the decision procedure for the extent of each area, and is a related guideline of IEC 60092-502 ed.5 1999-02 (IEC, 1999) to which the IGC Code referred. In addition, for hydrogen gas release from a vent mast onboard, the scope of its gas dangerous zone was investigated by using an atmospheric diffusion simulation tool, Phast(DNV).
The gas dangerous zones by the IGC Codes (IMO, 2016) are basically referred to IEC60092-502 ed.5 1999 (hereinafter called IEC92), and are divided into three zones (Zone 0, 1, and 2) arranged in order of higher degree of risk for the tankers (carriers) that transport four kinds of flammable cargoes at sea in bulk.
The extent of these defined zones is independent on the kind of liquefied gas loaded onboard by IEC92. IEC 60079-10-1 ed.2 2015-09 (hereinafter called IEC79) that stipulates the guidelines for decision of a series of extent of the gas dangerous zones for various flammable gases, and is considered as the original reference on the examples of extent of the gas dangerous zones in IEC92.
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