Case Study 2101 – Jack-Up Unit Helideck Strength Verification

Jack-Up Unit – Helideck Strength Verification

Rig Name: Jack-Up built in Dunkirk, France
Rig Type: Jack-Up CFEM
Classification Society: DNV
Pertinent code: CAP437
Code design: ASD (WSD method)

Model 3D
Please download PDF version to see 3D model – click here

Project description
Rig Engineering (R.E.) was tasked by a leading drilling contractor to carry out strength verification of existing helideck located on jack-up drilling unit. The finding was used to guide the wall thickness gauging technician to do a thickness evaluation and assess the overall integrity of the helideck ahead of class inspection.

FE Models



R.E. Scope of work
R.E. was tasked to perform the following engineering tasks:

Preparation of CAD layout looking at the physical effects of landing and takeoff and various aiming circle requirements etc. (for DNV and CAP 437)
• Conclusion of FEA model and do calibration run for current S61N set-up (for DNV).Re run analysis with new helicopter type using DNV class rule requirements.
• Re run analysis with new helicopter type using CAP 437 requirements.
• Re run on the final / agreed combination that would reflect operational requirements and some dispensation from either CAP 437 or DNV’s requirements.
Engagement Condition
Upload your problem to us and give us relevant input to allow us to resolve your problem we will need:
1. As built of structure to created 3D FE model.
2. Static and environmental loads of rig.
3. Details information about type of helicopters.
Key word: Rig Engineering, jack-up, helideck, CAP 437, helideck capacity, CFEM, helideck inspection, helideck, fitness for purpose