Leg Penetration Analysis (LPA) and installation

Calypso supports jack-up installation and jack-up de-installation operations. Our reports are intended for use on board as practical guidance, by the engineering team for risk assessment, by the commercial team for planning and for third-party review. They stand out through readability and clarity.

Jack-up installation relates jack-up operations to soil behavior. Any analysis is therefore performed by a jack-up engineer knowledgeable of geotechnics or by a geotechnical engineer knowledgeable of jack-up operations. Both areas of expertise are present in the assessor to ensure a correct assessment and usable operational guidance. Furthermore, every Calypso engineer is trained and licensed to come on board and provide hands-on operational guidance if needed.

Leg Penetration Analysis

A Leg Penetration Analysis (LPA) is performed to determine expected penetrations and indicate any risks associated with installation of the jack-up. It is typically performed as part of an SSA, but can be performed stand-alone as well. LPAs are performed strictly in compliance with ISO 19905-1:2023, including complex multi-layer interaction, squeezing and punch-through mechanisms.

The following key items are addressed:

Seabed features inc. footprints
Rapid penetration and Punch-through
Hang-up
Backfill
Settlements
Scouring
Leg extraction
Expected penetrations

The dedicated 2-page or 3-page report includes lower-bound and upper-bound penetration resistance graphs, a risk assessment with recommended mitigative measures and recommended preloading guidance. All information is presented in tables and graphs to ensure high readability.

LPAs are offered at a short delivery time and include unlimited revisions to accommodate to any changes in the project.

Request LPA

Leg Extraction Analysis

A Leg Extraction Analysis (LEA) is performed to determine the required pulling force for leg extraction. It is used to provide operational guidance for a smooth leg extraction and, in the worst cases, to address the risk of the jack-up being unable to independently vacate the site.

The report presents the upper-bound and lower-bound extraction resistance curves as well as the active and passive leg pulling capacity. Cases with and without a functioning jetting system are assessed.

The analysis is performed in accordance with state-of-the art industry practice, taking into account resistance of soil above and below the spudcan as well as side-friction and effects related to the duration of the stay.

Operational guidance with respect to leg extraction is provided in addition to a risk assessment and proposed mitigative measures.

Punch-through tolerance assessment

A punch-through tolerance assessment addresses the consequences of an unmitigated punch-through event including the risk of progressive structural failure of the jack-up. It presents detailed preloading guidance to minimize the risks, including mitigative measures such as leg-by-leg preloading and stepwise preloading whilst maintaining a draft.

The analysis addresses the following items:

Leg travel
hull tilt
resulting freeboard
leg moments and forces
structural strength

Punch-through tolerance assessment reports are offered to address and mitigate risks associated with punch-through or rapid penetration during jack-up installation. The reports are suitable for third-party review. The proposed guidance is suitable for direct implementation on-board.

Detailed geotechnical analysis and risk assessment

A geotechnical risk assessment is an in-depth analysis of geotechnical risks associated with going-on-location, preloading, elevated operation, storm survival and going-off location of a jack-up at a specific site. The aim of the geotechnical risks assessment is to classify risks, quantify mitigative measures, support ALARP risk operations and to be included in HAZOP studies.

Geotechnical causes of risks include presence of boulders and unexploded objects (UXO), irregular bathymetry and footprints, loose or weak top soil, rocky seabed, seismic activity (earthquake), insufficient geotechnical data and complex or irregular soil layering. Geotechnical risks include scouring, liquefaction, settlement, punch-through, sliding and leg-splay leading to leg moments and Rack-Phase Difference (RPD).

Testimonials

What our customers say about us

''Calypso is responsive and straight-forward to work with, understand our operations and have the ability to provide short turn-arounds. All of which we need to operate our assets in a flexible and efficient manner.''

Mads Albér

Chief Technology and Innovation Officer

''Very positive collaboration, short response time and replies on time, we are happy to have Calypso as our consultant for installation jack up assessment and settlements analysis of existing units.''

Elysée Mahend

Coastal Development Engineer, Perenco

''Calypso delivers fast responses and support. Their hands-on engineers stay closely involved to ensure results.''

Geert Weymeis

Offshore Wind Engineering, Jan de Nul

''Calypso doesn’t just deliver services. They deliver trust, reliability, and strategic impact. That is why we consider them a vital partner in driving Jack Up Barge continued growth and leadership.''

Damiaan Sprenger

Commercial Director, Jack-Up Barge

“Very supportive, short response time, deep knowledge on jack-up operations – we are happy to have Calypso as our consultant for jack-up operations.”

Johannes Katz

Project Engineer, Blue Installation Group

request form LPA

Please fill in the form to request a Leg Penetration Analysis.

What information do I need to provide?

Spudcan shape
Applied preload
Soil investigation report or CPT-data
A purchase order

How long does it take?
The LPA-report will be delivered within 2 working days after all required information has been provided.

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