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Challenge the Sea

Crane System in Pipe Laying Vessel

Challenge - Complete pipe laying system

A leading global contractors specializes in seabed-to-surface engineering, construction and services to the offshore energy industry worldwide. To match the evolving needs of deepwater subsea developments, our client promised to set a new benchmark in the subsea world with the state-of-art strategic enabler - DP Pipelay and Heavy Lift Construction Vessel.

One major feature to the 182.2m long Swiss Army knife was the deepwater S-lay capability. Flexibility and productivity was the key.

From port side of the deck, single joint pipe sections were fed into the firing line running along the length of the vessel to be welded into a continuous pipeline the vessel. After the firing line, the pipeline passed over the vessels stinger at the stern to be lowered to the seabed in an S-shaped curved.

A crane system was required in the length of the S-lay system to ensure flexibility in the operations. Other than pipe transfer, part of it needed a lifting system to configure the firing line with eleven stations to make up single joints of pipe, or six double joint stations, offering broad flexibility in the types of pipelines the vessel can install.

Image: DP Pipe Laying and Heavy Lift Construction Vessel

The challenges to be solved were the very confined space onboard, the environmental factors and the ever-inconsistent seas. Here was where our partner recommended Jenmon to assist our client.


Solution - Offshore customization

Complex applications needed special expertise and solutions. Jenmon was chosen as the provider of the vessel 18 units of 10 ton wire rope hoists and 15 ton chain hoists, comprised of under slung cranes and monorail cranes. Jenmon worked closely with the client to design cranes that fitted their needs.

When designing cranes in ships, it was the efficient utilisation of the confined space. With state-of-the-art, high quality products, Jenmon provided special designs with super tight headroom and optimized hook approach.

Mounted directly on the ceiling, the underslung cranes and monorail cranes allowed efficient material handling even in the tight spaces of the ship. With the energy chain power supply system replacing the traditional festoon systems, work space under the cranes were further increased. This translated into more effective usage of workspace height.

Furthermore, offshore customization was integrated into the equipment to lengthen the maximum life span and maintain efficiency in the seas.

Meticulous in every gap

Sagging and hogging were common in ships. To counter, runways were installed with 50mm apart each other and larger wheels of the crane trolley were machined. A high demand in precision and quality control were necessary.

Travelling Steadily

Maintaining a steady movement was vital as well. Having to operate these lifting equipment safely in the middle of the ocean, customized Rack and Pinion drive system was incorporated into the crane track to suit sea-worthiness.

Preventing Corrosion

Taking in consideration of the environment, the crane structures were treated in accordance to the specifications in offshore coating systems. Prior to paint applications, blasting had to be done by using shot to remove all contaminants effectively. For final protection against corrosion, special marine paint were used to provide long-lasting coating. Similarly, the hoist and its components were surface treated and painted with maritime paint.

Results - DNV Tested and Satisfied Customer

In 2011, the hoists and cranes were load tested and certified accordance to DNV standards in Sembawang Shipyard, Singapore. Our client was very pleased with the results and appreciated Jenmon for the support.

Jenmon cranes provided assuring reliability and capability, which will enabled us to meet our client's strategic needs, particularly in harsh environment acreage.

Having successful completed this part of the project, the barge moved off Singapore for its next phase of construction. The new flagship vessel will certainly tackle operations on any subsea installation project worldwide.


Certificate of Appreciation awarded by Client
"Thank you for your commitment to ensure that the project is completed"


Our aim is to ensure an operative crane on site at all times.

"Jenmon is made up of veterans with years of experience in the lifting industry. We are constantly updated with the latest market products, solutions and technologies, enabling us to provide solutions to suit all varieties of industrial lifting and handling systems. From the very first contact to maintenance, our team has the complete range of services tailored for you. "

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