INTRODUCING: SPUDPEN

CASK_SPUDPEN Computer Program for Jack -up Leg Penetration during Preload based on ISO 19905 – 1 (2016)

CASK_SPUDPEN task is to calculate independent Jack-up rig leg penetration behaviour during preloading according to ISO Standard 19905-1 (2016) including foundation calculation methods, e.g. squeezing for sand and clay calculations – software originally created by Steve Kay  Note: the Spudcan software is CLI (command line interface based) – so text based only.

SPUDPEN

Specification Summary:

The main task objectives are to:

– Predict the final leg penetration depth

– Identify potential punch-through situations.

Methods used:

Spudcan needs a single text input file (ASCII format).This input file contains all data to do the run at run-time there are no screen commands / menu. Once the data are read in by the program no changes to the data at run-time are permitted.

Seafloor
(aka mudline or seabed)
Also river bed (inshore)

 

 

Normally Consolidated Clay

Cohesive soil with an undrained shear strength su in the range 0.2 to 0.35 times the in-situ vertical effective

stress (0.2 < su / σ’vo < 0.35)

 

Undrained shear strength

Maximul soil shear stress at yielding or at a specified maximum strain in an undrained condition

 

Backfill

Submerged weight of all of the soil that can be preent on top of the spudcan

 

Backflow

Soil that flows from beneath the spudcan around the sides onto the top

 

Infill

Soil above the plan are of the spupcan arising from sediment transport or hole sidewall collapse (note: that infill is part of backfill)

 

Footprint

Sea floor depression which remains when a jack-up is removed from a site.

 

 

 

Foundation

Soil and spudcan  supporting jack-upleg

 

Spudcan Foundation

A spudcan is the footing on a leg of a Jack-up Rig. It is designed to spread the load so that the rig does not sink too deeply into the seafloor. In plan, spudcans are generally circular, polygonal or square, with a variable cross-section. The largest spudcan used to date is about 17.5 m diameter, 5 m high and a volume of around 500 m3.

 

Spudpole

A spud-pole is the footing on a leg of (smaller) Jack-up Rigs or barges/pontoons. These are heavy poles or pipes which penetrate the seafloor and hold it in place. Unlike spudcans, these are commonly installed using kinetic energy.

 

 

Skirted Spudcan

Spudcan with a peripheral skirt

 

 

Squeezing (aka extrusion)

In this context of spudcan penetration, squeezing denotes radial soil extrusion.

 

Punch-through

Rapid, uncontrolled vertical leg moment due to soil of failure in strong soil overlying weak soil.

Preloading

Installations of the spudcans by vertical loading of the soil beneath a jack-up leg spudcan with the objective of ensuring sufficient foundation capacity under assessment situations through to the time when the maxium load is applied and held.

 

Preload Reaction

Maximum vertical reaction under a spudcan, VL, supporting the in-water weight of the jack-up during the entire preloading operation.

 

Gross Bearing Capacity

Ultimate Limit State (pure V load) – at foundation depth D (or fictitious foundation depth DPT) excluding soil

 

surcharge (if any) between D and DPT

 

Net Bearing Capacity

as Gross Bearing Capacity but including soil surcharge between D and DPT

 

 

 

 

How does Spudpen work?

Download the Software

The software contains Spudpen.exe which you can run via command line MsDOS / PowerShell on a Microsoft Windows computer

Put HASP-key in Computer

The HASP-key is like a USB-stick that you need to unlock the software for x time of license period.

Create Input File

The Spupen reads textual input files, which you can manually alter and update with your data.

Generate Output File

Run the command line with your updated input file and view the output file. Ps. if you are handy you can write your own code script.

Pricing

Note: each license term can be adjusted to your needs with a minimum of 1 year and 1 user.

Single User

1 x license
1 x HASP-key
1 year license

Multi Users (x 5)

1 x license
5 x HASP-key
1 year license

5+ or more

1+ licenses
5+ HASP-keys
1+ year licenses

"This is the first book dedicated to the geotechnical design of intermediate foundations, and it will appeal to professional engineers specialising in the offshore industry."

S. Gourvenec

Book: Intermediate Offshore Foundations

Summary:

Intermediate foundations are used as anchors for floating platforms and ancillary structures, foundations for steel jackets, and to support seafloor equipment and offshore wind turbines. When installed by suction, they are an economical alternative to piling, and also may be completely removed.

 

They are usually circular in plan and are essentially rigid when laterally loaded. Length to diameter embedment ratios, L/D, generally vary between 0.5 and 10, spanning the gap between shallow and deep foundations, although these are indicative boundaries and the response, rather than the embedment ratio, defines an intermediate foundation.

 

The first chapters introduce foundation types; compare shallow, intermediate and deep foundation models and design; define unique design issues that make intermediate foundations distinct from shallow and deep foundations, as well as list their hazards that mainly occur during installation. Later chapters cover installation, in-place resistance and in-place response, and miscellaneous design considerations.

 

There is no general agreement as to which design methods/models are appropriate, so models should only be as accurate as the data. Therefore, several reasonably accurate models are provided together with comprehensive discussion and advice. Example calculations and over 200 references are also included.

Questions / Enquiries? Please, contact us

Trusted and used by international offshore and engineering companies

• SBM Offshore • SPT Offshore • Multiconsult • Bluewater • RINA • HDEC • 

and many more.