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Recently, Haijian 52 (a China Marine Surveillance ship) achieved absolute success in sea trial through a three-day trial voyage. Previously christened as “Shijian” (English: practice, Chinese: 实践) and commissioned in 1967, it was renamed “Haijian 52” in 1985. The ship was reconstructed by Wuchang Shipbuilding Industry Group Co., Ltd. in 2012 including  reconstruction of the original main propulsion system and adoption of a propulsion system of 2 medium-speed diesel engines + high flexible couplings + gear boxes + twin controllable pitch propellers, ensuring that the ship performs better in fulfilling future marine tasks. 

“Haijian 52” has a vessel age of 40 years, and as such, the original structure was outdated and most of the supporting equipment needed replacements. In reconstructing the ship, many problems appeared, such as huge workload, ancillary facility supplies, a high degree of complexity and the need to satisfy the crew’s old operating habits.

A subsidiary of NGC Marine Group - Nanjing High Accurate Marine Equipment Co., Ltd., participated in the bid for the Project given its experience in constructing and reconstructing main propulsion systems of scientific research vessels and public service vessels. The scheme design was completed based on frequent communications and exchanges with the ship owner and designing institute. The Design Scheme took installation and commissioning of the main propulsion device into full consideration. The match design  of the propeller and engine in the scheme also satisfied requirements for navigational speed performance. Meanwhile, through an integration of the main propulsion system and the adoption of an imported control system, the safety and reliability of equipment were fully guaranteed. Finally, NGC won the order for reconstructing the main propulsion equipment as the design scheme was accredited by all parties .

The ship underwent performance inspections during sea trial on the main propulsion system, reaching a navigational speed of 1 knot faster than the designed speed at 85% MCR which  surpassed design requirements and won high praise from the ship owner.

In fulfilling the reconstruction of this special ship, NGC completed the design, manufacture, installation and commissioning of the propulsion system, thus accumulating substantial technology and experience in propulsion systems reconstruction. (By Chen Baojia)