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Latch-Lok Jacking System For Platform Jackets and
Subsea Templates
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Oil
States MCS provides economical, standardised levelling systems for offshore
structures that are anchored by foundation piles, including subsea templates,
subsea manifolds and platform jackets. When the levelness of a planned
structure is critical the Latch-Lok Levelling system is incorporated at the
design stage. During installation, after piles are driven, the structure
can be levelled with precision, thereby preventing problems (such as
misalignment of casing hangers and tie-back systems) during subsequent drilling
and completion operations. Oil States MCS Levelling System is applicable
to all types and sizes of templates and to jackets with either skirt or main
piles. |
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The
Latch-Lok Leveling Tool is a hydraulically actuated lifting device that is
deployed after foundation piles have been driven. The tool is primarily
used for leveling templates and jackets having skirt piles, although it can also
be used at the surface on a jacket's main piles. The Latch-Lok tool works
at any water depth and can be used with either conventional grouting or in
combination with the Hydra-Lok®
pile swaging system (left), which is used for making permanent
structure-to-pile connections.
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The
Latch-Lok tool is deployed from the installation vessel onto the foundation pile
at the lowest corner of the structure. The tool can be adjusted to
accommodate various piling heights. No diver intervention or guidelines
are required. Once the tool is supported by the pile, its hydraulic
cylinders are actuated to extend the latch frame downward until the latches
engage the latch ring. When the hydraulic cylinders are retracted the tool
reacts against the foundation pile lifting the structure level, smoothly and
precisely. Latch design prevents accidental release.
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| The Latch-Lok Tool is easily released for retrieval to the surface or for
relocation to another corner of the structure if required. The primary
method of release is by full extension of the hydraulic cylinders which
positively retracts the latches. Back-up release is by pulling on the
deployment rigging, which retracts the latches mechanically. |
Superior to Mud-Mat Jackets
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| As the foundation pile provides firm, unyielding support levelling with the
Latch-Lok Tool is precise and reliable. This is especially important when
compared to the conventional mud-mat jacking systems used for template levelling.
Mud-mat jackets between the template and the mud-mat react against the sea floor
which can shift as weight is re-distributed during levelling operations.
Another important advantage over mud-mat jacking systems is that the Latch-Lok
Tool is recovered after levelling, whereas the mud-mat jacks are expendable,
adding to project cost. Finally, if there is a mechanical problem the
Latch-Lok Tool can be retrieved and replaced with the back-up tool, mud-mat
jacks offer no back-up. |
Combined Latch-Lok and Hydra-Lok Levelling and
Connection
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Typical Procedure
- Deploy the Latch-Lok/ Hydra-Lok combination to the lowest corner.
- Raise this corner level with the highest, hold and swage pile.
- Release tools, relocate to next lowest corner and repeat procedure.
- Repeat procedure for remaining corners.
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For Further Information
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Click on the link to view the
Latch-Lok brochure (12 Mb)
For further details, a
consultation or quotation please go to the Contact Us
page where you can E-mail OSMCS Ltd using the online form. If you prefer to
speak to an engineer in person our telephone number is also available on the
contact page.
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OIL STATES MCS LIMITED
