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Rack phase differential monitoring + single-chord jacking

RPD.
Every chord, in control.

Turn rack phase difference into clear, real-time jacking decisions—so operators can act early, control each chord and protect the leg.

↓Explore the system
Jack-up rig fitted with a Rack Phase Differential monitoring system

RPD field installation · Jack-up rig

0.3 mmrack-phase resolution

01 · The challenge

Jacking by feel
is no longer enough.

Rack phase difference can give an early indication of possible leg overstress, yet continuous manual measurement during jacking is difficult and labour intensive. RPD turns that variable into an accurate, recorded electronic and mechanical measurement across all three legs.

For a documented Thailand retrofit, Monitor Systems supplied an M1000 RPD system and modified the existing control system for single-chord jacking—from survey, design and build through documentation, installation assistance and commissioning.

Shelf Drilling Enterprise is one example installation. The RPD architecture is applied across multiple owners’ jack-up assets worldwide, with each retrofit engineered around the rig’s existing jacking arrangement.

02 · RPD + single-chord control

From measurement
to a safer decision.

Select a marker to explore the measurement, control, operator and retrofit layers behind an RPD-enabled jacking operation.

Single-chord jacking contactor assemblies for an RPD system

Single-chord jacking hardware · Select a system marker

01

Rack phase differential measurement

A clear reading of every leg’s condition

M1000 RPD measures and records rack phase difference across all three jack-up legs. The product architecture uses high-accuracy absolute encoders to give operators continuous feedback rather than relying on manual measurement.

0.3 mm resolution from absolute encoders
  • One daisy-wheel sensor per leg chord: three per leg, nine across a three-leg rig
  • Real-time measurement and recording of rack phase difference
  • Designed to remain effective through vibration, shock and lateral leg movement

03 · Engineered for a moving rig

A controlled jacking retrofit,
not a black box.

RPD connects field measurement, motor control and operator guidance into a system that can be tailored to the jacking configuration already in service.

Monitor Systems engineer commissioning RPD equipment from a jack-up control room
Commissioning RPD control and monitoring equipment offshore
01

Continuous monitoring

Automated phase-difference measurement supports real-time feedback, recorded data and early warning of conditions that need attention.

02

Single-chord control

Controlled correction at individual chords supports practical leg deployment and recovery while reducing risk to jacking equipment and structure.

03

Operator response

Graphical and numerical HMI views, configurable alarms, trends and maintenance guidance turn system data into a clear next action.

04

Retrofit + support

Survey, design, engineering, installation assistance and commissioning bring the RPD solution into an existing jack-up environment.

Explore RPD capability

04 · Project evidence

A documented retrofit.
Built for the leg.

The Thailand RPD project paired monitoring with single-chord jacking control in one delivered system. Its hardware and control architecture was designed, assembled, documented, installed with offshore assistance and commissioned by Monitor Systems.

View the original RPD project update
9RPD poles across three legs
4Siemens S7-1500 PLCs
7remote I/O racks
804I/O points

Monitor Systems Engineering

Let's engineer
what's next.

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