Combined strengths

GustoMSC is one of a leading design and engineering

company involved in all types of mobile units/vessels for

the offshore industry, including the delivery of associated

equipment. The innovative solutions are cantered on all

types of jack-up units, semi-submersibles and mono-hull

vessels.

Siemens has been, for over three decades, a main supplier

in process control and electrical systems for offshore

applications. Delivering motors, drives, HV/LV power

supplies, automation and instrumentation.

GustoMSC and Siemens have entered into a long-term

partnership combining the experience, knowledge and

expertise of both companies which enables GustoMSC to

freely access the latest developments regarding drive and

automation technology.

History

One of the first successful results of this partnership was

the delivery of the first series of variable speed drive rack

& pinion jacking systems.

GustoMSC rack and pinion jacking systems have been

applied over the last three decades to an array of jack-up

drilling units, well-servicing and maintenance barges as

well as drilling rigs for arctic conditions. Jacking systems

for six CJ46-X100-D drilling rigs and six NG2500X self

propelled Jack-up vessels are currently constructed.

The Challenge

With the need to improve efficiency, operability and

reduce relocation times of offshore jacking units, speed

and precise control of the leg handling system are of

paramount importance. In cooperation we aim to fulfil

these needs.

The GustoMSC jacking system offers a safe operation due

to the multi layer safety and control systems to protect

both people and equipment.

The range of jacking systems suits the GustoMSC CJ- and

NG-series but can be easily customized to any other jack-

up rig design. The jacking system is also suitable for

operations in conjunction with the GustoMSC leg fixation

system.

GustoMSC Variable-speed drive solution

for Rack & Pinion jacking systems

www.siemens.com/oilgas

Jacking System Features

Step-less speed control The electric motors of the rack and pinion systems are driven by Siemens’ individual variable speed drives (VSD’s). This arrangement allows for step less speed control between zero and maximum speed and very accurate control of the motor torque and therefore pinions torque. By ensuring the torque is equally shared by all motors and pinions the operation is smoother with less stress and wear.

Rack phase difference (RPD) One potential challenge is if the spudcan, at the bottom of the leg, encounters an uneven sea-bed it can deflect the leg, this deflection causes RPD. The GustoMSC jacking system uses Siemens’ encoders on the motors to monitor the position of each chord on a leg to detect RPD before damage occurs.

Torque control Pre-torque to each pinion can be applied without manual intervention. By means of the Siemens PCS7 automation platform, providing central torque control functions the GustoMSC jacking system can limit sudden leg movements, for instance when a leg is extracted from the sea-bed or prior deployment of the fixation system, using the invertors at very low speed.

Technical Characteristics

Each jacking unit consists of a special design, 7 teeth pinion, driven by an electric motor through an input- and planetary gearbox.

In general, the jacking units, assembled in a floating jacking frame, engage with a rack of the jack-up legs. The floating jacking frame is equipped with rubber pads on upper and lower end, allowing the units to follow the rack. In the rubber pads, load measuring devices can be incorporated. Alternatively, the jacking units are mounted in a fixed jacking structure, depending on the overall jack-up design.

The electric VSD driven rack and pinion systems offer the following operational characteristics:• Variable and slow / zero speed control • Optimized load sharing over the pinions • Use of standard, offshore type electric motors, without

special high-slip requirements • Easy retorqing through the VSD drives• Automatic platform leveling during lifting and lowering • Leg position indication and rack phase difference (RPD) • Redundant PLC system • Load measuring through the VSD drives and optionally

through load measuring devices in the upper shock pads for floating units

• Increased leg handling speed

CertificationThe jacking systems can be delivered with certificates from recognized Classification Societies such as ABS, DnV, Lloyds.

After Sales Service

Through its worldwide network the GustoMSC/Siemens partnership provides 24/7 after sales service.

Gusto MSC, NetherlandsP.O. Box 11, 3100 AA SchiedamTel. +31 (0)10 232 0000Email: Marketing@GustoMSC.com

Siemens Nederland N.V.Prinses Beatrixlaan 8002595 BN Den HaagTel: +31 (0)70 333 3333Email: oilgas.nl@siemens.com

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