Site-specific Assessment (SSA) and elevated operations

Calypso assesses the suitability of jack-ups for planned operations, for extreme events such as storm survival and for special cases including severe RPD and scouring effects.

Our reports are intended for use on board, use by commercial teams and engineering teams as well as for third-party review. They stand out through readability and clarity. A dedicated Captain’s summary provides a single page, tabulated and illustrated overview of the report.

The workability for planned operations is determined to optimize fleet usage and enable educated planning.

Site-specific Assessment (SSA) of jack-ups

A Site-Specific Assessment (SSA) is performed to assess the suitability of a jack-up for a specific site. Planned operations and survival are assessed. SSAs are performed strictly in compliance with ISO 19905-1:2023. Additional codes and standards may be applied as well.

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The jack-up is checked for the following key items:

Structural strength of leg chords and braces or overall tubular
Jacking system or fixation system capacity
Guide strength
Overturning stability
Foundation capacity

SSA reports are created to be of the highest quality, focusing on the following aspects:

Clarity for direct implementation in procedures
Optimized use of the jack-up with maximized workability
Flexibility to allow for operational changes

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

Request SSA

RPD tolerance assessment

Rack Phase Difference (RPD) is an indication of bending moment in the leg. It is typically observed when jacking the hull out of the water and indicates leg splay or sloped seabed. It may also be observed when jacking the hull down after elevated operations. In this case, a cause for RPD has risen during the elevated operations, e.g. due to sliding or scouring.

The RPD tolerance, often indicated as a fixed number in mm, is in reality dependent upon site-specific conditions. The RPD tolerance of a jack-up undergoing an extreme storm or a heavy lift, for instance, may be significantly smaller the RPD tolerance of a jack-up jacking down in a benign environment.

An RPD tolerance assessment determines the allowable RPD based on general or site-specific conditions. It can be used to determine if any leg components have been exposed to higher-than-allowable stresses.

Monitoring campaigns

Monitoring campaigns are performed to increase workability by reducing uncertainties. Desktop engineering analysis may contain large uncertainties about reality, which may lead to (overly) conservative assessments. Monitoring bridges the gap between desktop engineering analysis and reality. Gap-bridging monitoring is used to reduce uncertainties and thereby increase the workability and to expand the operational season or capabilities of a jack-up.

The leanest monitoring campaign consists of applying a motion sensor on-board combined with detailed environmental forecast or hindcast. More detailed campaigns may include measurement of strains, position, waves, wind and current.

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 SSA

Please fill in the form to request a Site-Specific Assessment.

What information do I need to provide?

All available information regarding the jack-up, eg. technical drawings, previous SSA reports, designer’s manual etc.
All available information regarding the site, eg. metocean report, soil investigation report, planned operations.
A purchase order

How long does it take?

The SSA report will be delivered within 3 working days after all required information has been provided.

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