Engineering HPU Skid Module Design - P. van den Oever

Conbit’s expertise in modular construction

P. van den Oever awarded Conbit the design and engineering contract for the module covering of a Hydraulic Power Unit (HPU). The HPU required a container-type structure that met the offshore standards.

The scope of work includes engineering the module, structural analysis of the final design, design of rigging configuration, and fabrication supervision.

Watch how we prepare and execute

Watch how we prepare and execute

The proposed solution to assemble the lifting set

Project approach 

Conbit’s approach in the project was in three phases.

In the concept phase, the senior structural engineers developed the design. They finalized and approved the plan with the client before embarking on basic engineering.

In the engineering phase, one of the deliverables was the Material Take Off (MTO) list. With this list, the project team set the budget for the construction by requesting suppliers the prices of the material and estimating the workforce requirement. During this phase, the structural engineers performed the structural analysis and the structural analysis report.

In the last phase, the first part of the detailed design was used to prepare all drawings and other specifications for the production phase. The second part focused on meeting all the project requirements, such as preparing test and inspection plans.

The Hydraulic Power Unit will operate in offshore environments all over the world. Conbit and its client, therefore, tried to meet the most applicable offshore standards so that the system could be deployed relatively flexibly. More importantly, it should be safe to transport and operate.

HPU skid design and dimensions

The design was based on the DNV 2.7-1, “Standard Certification – Offshore Container,” and the EN 12079-1 guideline for “Offshore Containers and Associated Lifting sets.” The module is classified as an Offshore Service Container ISO Designation: 1BBB (30 ft High Cube).

The HPU weighs 10,500 kg. The main structure of the skid module weighs 4,200 kg. The assumed total weight of the module for structural analysis was set to 20,500 kg, and dimensions were 9,105 x 2,418 x 2,896 mm (LxWxH).

Tests and certificates 

After the completion of the fabrication of the skid frame, the team load tested it at the yard. They also conducted a drop test in line with regulatory guidelines. After the tests were successfully completed, the fabrication was then finalized, and the complete module was coated.

See how we got to work

Engineering HPU Skid Module Design - Frame
Top view of module
Load test of the HPU skid module
Load test of the HPU skid module
Container final

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Bram van Oirschot

Bram van Oirschot

Commercial Director