Beijing Zetron Technology Co., Ltd CN

How do LNG carriers detect gas leakage during transportation?

Source: Beijing Zetron Technology Co., Ltd Popularity:105 Time:2023/01/13 14:38:58 small middle big
LNG ship is a special ship for transporting ultra-low temperature liquid natural gas around minus 160 degrees Celsius. As LNG is highly flammable, it is easy to cause explosion if it leaks during transportation. Therefore, this type of ship is internationally recognized as a high technology, high difficulty and high value-added ship, and enjoys the name of "the crown jewel of shipbuilding industry" as well as aircraft carriers and luxury cruise ships.

For some spaces that cannot be reached during daily work but need to detect whether there is cargo gas leakage, LNG ships usually set up dangerous gas sampling detection system, that is, the local gas samples are extracted through pipelines to the dangerous gas detection probe set up in the electrical room for testing, and portable pumping dangerous gas detectors should be carried to confirm the safety of the workplace. 

For spaces that are accessible for daily work and need to be continuously detected for cargo gas leakage, LNG vessels usually set up fixed hazardous gas probes, such as at the entrance of living quarters, engine room, double wall pipes of double burners, etc.

Different companies have different mobile dangerous gas detectors on board, but basically they are equipped with two types of detectors, one is the detector shown below, which is used for daily work such as detecting at the gas collection platform during loading and unloading or detecting gas samples in the space before entering the enclosed space.

The other will be a small gas detector as shown below, usually used for personnel to carry with them when entering a confined space in order to detect the surrounding gas to confirm the safety of the ambient gas.

Usually, mobile dangerous gas detectors will generally be able to detect at least four gases, some will also be slightly more, then the first must be able to detect methane gas, and then naturally it must be able to detect the oxygen content, the detection of these two gases is necessary and basic, other gases will be different detectors, or can be installed according to the different detection probes Detection of the corresponding dangerous gases, larger detectors in addition to methane and oxygen, but also carbon dioxide, carbon monoxide and hydrogen sulfide gas detection, while small detectors in addition to methane and oxygen can also be detected on carbon monoxide and hydrogen sulfide.

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