Pig Launcher / Receiver Landing and Levelling Systems
Subsea Pig Launcher and Receiver Landing and Levelling Systems can be substantial components once fully integrated with ROV-operable valves, kicker lines, and subsea pipe line connectors.
They require substantial deployment frames which support all of their internal componentry and which interfaces with docking and guiding systems.
These include items such as:
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Hydraulic Jacking Cylinders
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Soft Landing Cylinders
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ROV-operable Screw Jacks
Coupled with the above considerations, pig deployment and retrieval often requires the integration of “soft landing” systems as well as ROV-operable jacking, levelling and skidding systems.
ICON is experienced in the design of such assets which requires a high degree of interface and integration between mechanical, structural and offshore installation engineering as well as ROV operation and subsea engineering disciplines.
Selection of materials, surface coatings and cathodic protection systems are also important considerations to ensure that units will survive seabed deployments of many years between maintenance and refurbishment programs.
Hydraulic Jacking Cylinders
These are ROV operable and allow the rear end of a PLR unit to be raised or lowered in order to facilitate precise alignment of subsea pipe connectors which join the PLR to export pipelines.
Soft Landing Cylinders (SLCs)
These serve to dissipate energy of the PLR landing onto a subsea Gas Export Riser Base. Their dynamic performances have to be tuned to be similar to that of other third party equipment often incorporated into Pig Launcher systems.
ROV-operable Screw Jacks
ROV-operable Screw Jacks provide a reliable locking mechanism to transfer and carry the PLR load for periods of up to three years while the PLR may be in position. To provide further redundancy and higher system reliability, the screw jacks can be fitted with ROV Torque buckets, so that they can actually be used to raise or lower the PLR in lieu of using the hydraulic cylinders.
