Co-founder and CEO of True North Energy
True North Energy
China Classification Society
16:30 - 17:00
Wednesday, 18 September 2019
T1.6: Multimodal Transport of LNG ISOTanks: Pilot Projects Experience from China
Transport of natural gas, predominately in the form of Liquefied Natural Gas (LNG), is of growing importance in China. Different from traditionally transport of LNG in bulk, multimodal transport of LNG ISO tanks is a kind of packing and shipping method which could be an important supplement to the existing LNG transportation market. It is more flexible, convenient, has less cargo loss, and can realize a door-to-door LNG supply service by using the existing containers logistic networks.
To study and demonstrate the safety transportation of LNG ISO tanks on land and water, China Classification Society (CCS) has cooperated with industry to conduct two pilot projects in China.
The first pilot project aimed to develop a multi-layer stowage solution for LNG ISO tanks stored on board. When LNG ISO tanks are stowed in multi-layers, the biggest risk is the unexpected boil-off gas (BOG) from LNG tanks, which may leads cryogenic damage to surrounding structures or persons, or forms combustible atmosphere. To control the risk of BOG, the pilot project consisted of three parts:
- Static test on land. This test was to simulate the situation of stacking at storage yard. 10 tank containers were placed statically until the pressure inside raised up and BOG released. This test is to analyze the model of pressure changing inside tanks and demonstrate the safety for long time storage of LNG ISO tanks.
- Ship trail. The ship trail was transport 4 LNG ISO tanks from Antwerp Belgium to Ningbo China. The duration of the voyage is about 40 days one way. This trial is to simulate the transportation of the tank in normal navigational status.
- Full-scale bench test. The bench test was to study the extreme navigational status. An actual 40-feet full scale LNG ISO tank was placed on the test-bed and different sea conditions were tested from sea state level 3 to level 8.
The second pilot project was to transport 130 LNG ISO tanks from Hainan Yangpu LNG receiving station to the Bohai Rim by ships. It was helpful to alleviate the imbalance between north and south China in the natural gas markets. In this project, practical experience in handling and controlling of LNG ISO tanks in the port and onboard will be presented respectively. Besides, major risks in above aspects are identified and corresponding risk mitigation measures are provided.
- LNG ISO tanks are becoming more and more important in Chinese energy market.
- By applying appropriate risk control measures and operation management, the safety transportation of LNG ISO tanks can be ensured, even for the long time overseas transportation.