Motion Compensation
Motion Compensation Systems
PHC series 50 T – 600 T plus drill-string heave compensation and line tensioners — design accordance with API spec 2C and approval by classification societies.
PHC series 50 T – 600 T plus drill-string heave compensation and line tensioners — design accordance with API spec 2C and approval by classification societies.
In-house engineered series of Passive Heave Compensators (PHC) and semi-active heave compensation systems for offshore lifting, drilling, sampling and through-splash-zone subsea operations — decoupling vessel motion from load and widening the operational weather window.
Dimension has been designing and building heave compensation systems since 2012, delivering passive, semi-active and hybrid solutions across the offshore wind, renewables and oil & gas industries. The PHC series ranges from 50 T to 600 T SWL with customisable stroke and load envelopes; the drill-string heave compensation portfolio extends from 30 T to 150 T rated pull. All builds are engineered in accordance with API Spec 2C and approved by recognised classification societies (DNV / LR / ABS / Lloyd's LAME).
Selected imagery from the Dimension PHC and heave compensation portfolio — engineered, fabricated and commissioned in-house since 2012.
Project photography and engineering renderings from delivered Dimension builds. Project-specific arrangement drawings are issued as part of the formal engineering submission.
Indicative configuration ranges across the PHC and drill-string heave compensation portfolio. Final specification is project-dependent, customisable on stroke and load, and confirmed during FEED.
| Parameter | Value |
|---|---|
| Type | Passive (PHC) / Semi-Active / Active heave compensation |
| PHC SWL Range | 50 T – 600 T (customisable) |
| Drill-String HC Rated Pull | 30 T – 150 T |
| Operating Stroke | 3.0 m – 6.0 m (customisable) |
| Compensation Buffer | Nitrogen gas + hydraulic fluid (mineral oil ISO VG32-68) |
| Surface Treatment | Marine coating |
| Operating Temperature | −10 °C to +50 °C |
| Humidity | 95% |
| Equipment Protection | Olmsted Valve Slingshot / Anti-Recoil Speed Control |
| Design Code | API Spec 2C (Specification for offshore cranes) |
| Classification | DNV / LR / ABS / Lloyd's LAME 2009 |
| Self-Contained | Yes — no external hoses or wires (PHC range) |
| Availability | Rental or purchase |
Seven builds across the Passive Heave Compensator series and the wider drill-string heave compensation portfolio. Select a build to view its full specification, project reference and key features.
600 T SWL · 3.0 m operating stroke · API Spec 2C · DNV / LR / ABS · Self-contained spring-damper
Flagship Passive Heave Compensator engineered by Dimension for heavy offshore lifting in the offshore wind, renewables and oil & gas industries. The system is a fully self-contained gas-pressure / hydraulic-fluid spring damper — no external hoses, wires or HPU connections required. Stroke and load range are customisable on the same modular platform. Designed in accordance with API Spec 2C Specification for offshore cranes and approved by classification societies (DNV / LR / ABS).
| Parameter | Value |
|---|---|
| Operational SWL | 600 T |
| Test Load | 900 T |
| Operating Stroke | 3.0 m (customisable) |
| Total Height | 7.863 m |
| Total Length | 2.900 m |
| Total Width | 2.200 m |
| Weight | 20.0 T (approx.) |
| Surface Treatment | Marine coating |
| Operating Temperature | −10 °C to +50 °C |
| Humidity | 95% |
| Compensation System | Spring damper — gas pressure + hydraulic fluid |
| Design Code | API Spec 2C |
| Classification | DNV / LR / ABS |
| Availability | Rental or purchase |
Singapore Salvage Engineers · 2018 · DNV class · 50 MT SWL · 3.0 m max stroke · Hydro-pneumatic
A 50 MT passive heave compensation lifting link — a large hydro-pneumatic spring that dampens the shock loading of a lift to account for ocean motions. Designed for surface-to-surface lifting operations, the unit incorporates one (1) hydraulic piston cylinder and two (2) piston accumulators connected by two independent hydraulic circuits, allowing set-up for two distinct loads. Built in 2018 for Singapore Salvage Engineers.
| Parameter | Value |
|---|---|
| Safe Working Load | 50.0 MT |
| Max. Stroke | 3.0 m |
| System | 1 × hydraulic piston cylinder + 2 × piston accumulators |
| Hydraulic Circuits | Two independent (set-up for two loads) |
| Hydraulic Fluid | Mineral oil ISO VG32-68 + Nitrogen |
| Application | Surface-to-surface lifting operations |
| Surface Treatment | Marine coating |
| Classification | DNV |
| Client | Singapore Salvage Engineers |
| Year of Build | 2018 |
Geoquip Marine AG · 2015 · Fukada / GMTR-150 twin-tower geotechnical drill rig · Lloyd's LAME 2009 · Dual-Ram Semi-Active
Dual-ram semi-active heave compensation system rated at 120 MT max dynamic load with 6 m stroke, integrated into the GMTR-150 twin-tower drill platform on the Fukada vessel. Electro-hydraulic actuation with a Nitrogen gas compensation buffer and Olmsted Valve Slingshot equipment protection. Built for Geoquip Marine AG in 2015 as part of the wider deepwater geotechnical drilling spread (main hoist rams, 150 MT power swivel, CPT & SBF umbilical winches, SBF compensation system, traction winches, iron roughneck and HPU/control modules).
| Parameter | Value |
|---|---|
| Equipment Name | Pull Drill Heave Compensation System |
| Max. Dynamic Load | 120 MT |
| Max. Stroke | 6 m |
| System | Dual-Ram Semi-Active Heave Compensation |
| Hydraulic Fluid | Electro-hydraulic |
| Compensation Buffer | Nitrogen gas |
| Equipment Protection | Olmsted Valve Slingshot |
| Classification / Standard | Lloyd's LAME 2009 |
| Client | Geoquip Marine AG |
| Year of Build | 2015 |
| Vessel | Fukada (GMTR-150 twin-tower) |
Geoquip Marine AG · 2014 · Lloyd's LAME 2009 · Dual-Ram Semi-Active · 6 m stroke
Dual-ram semi-active heave compensation system, rated 120 MT max dynamic load on a 6 m stroke. Electro-hydraulic actuation with Nitrogen gas compensation buffer and Olmsted Valve Slingshot equipment protection. Engineered, built and commissioned by Dimension for Geoquip Marine AG in 2014. Sister build to the 2015 GMTR-150 system.
| Parameter | Value |
|---|---|
| Equipment Name | Pull Drill Heave Compensation System |
| Max. Dynamic Load | 120 MT |
| Max. Stroke | 6 m |
| System | Dual-Ram Semi-Active Heave Compensation |
| Hydraulic Fluid | Electro-hydraulic |
| Compensation Buffer | Nitrogen gas |
| Equipment Protection | Olmsted Valve Slingshot |
| Classification / Standard | Lloyd's LAME 2009 |
| Client | Geoquip Marine AG |
| Year of Build | 2014 |
China Oilfield Services Limited (COSL) · 2019 · ABS class · 60 MT static / 50 MT dynamic · Anti-Recoil Speed Control
Drill string heave compensation system delivered to China Oilfield Services Limited (COSL) in 2019. Rated at 60 MT max static load and 50 MT max dynamic load on a 3.0 m stroke, with electro-hydraulic actuation and a Nitrogen gas compensation buffer. Equipment protection is provided by an Anti-Recoil Speed Control system, and the build is classed by ABS.
| Parameter | Value |
|---|---|
| Equipment Name | Drill String Compensation System |
| Max. Static Load | 60 MT |
| Max. Dynamic Load | 50 MT |
| Max. Stroke | 3.0 m |
| Hydraulic Fluid | Electro-hydraulic |
| Compensation Buffer | Nitrogen gas |
| Equipment Protection | Anti-Recoil Speed Control |
| Classification / Standard | ABS |
| Client | China Oilfield Services Limited (COSL) |
| Year of Build | 2019 |
Geoquip Marine AG · 2015 · Lloyd's LAME 2009 · Single-Ram Semi-Active · 3.0 m stroke
Single-ram semi-active heave compensation system rated 30 MT max dynamic load on a 3.0 m stroke. Compact entry point in the drill-string compensation portfolio — electro-hydraulic with a Nitrogen gas buffer and Olmsted Valve Slingshot protection. Built for Geoquip Marine AG in 2015.
| Parameter | Value |
|---|---|
| Equipment Name | Drill String Heave Compensation System |
| Max. Dynamic Load | 30 MT |
| Max. Stroke | 3.0 m |
| System | Single-Ram Semi-Active Heave Compensation |
| Hydraulic Fluid | Electro-hydraulic |
| Compensation Buffer | Nitrogen gas |
| Equipment Protection | Olmsted Valve Slingshot |
| Classification / Standard | Lloyd's LAME 2009 |
| Client | Geoquip Marine AG |
| Year of Build | 2015 |
Fugro Singapore Marine · 2020 · Sea State 6 · IP 56 · Subsea line-weight compensation
A robust line-tension compensation system for handling heavy loads in adverse weather and deep-water conditions. The Swiftwave Tensioner uses a set of moving sheaves, an MRU and the associated controls to widen the operational weather window. Designed for use as a subsea line-weight compensation system for geotechnical drilling and testing operations, the SH20H is fitted with one (1) hydraulic cylinder backed by a piston accumulator and an air-bank system. The current configuration is sized for use with 36 mm wire.
| Parameter | Value |
|---|---|
| SWL on Cable | 20 T |
| Compensation Length | 3.2 m max (± 1.6 m) |
| Wave Period | 10 sec min |
| Position Accuracy | 10 mm |
| Overall Dimensions | 4.2 m (L) × 0.8 m (W) × 0.8 m (H) |
| Overall Weight | 1.2 MT |
| Rated Pressure | 250 Bar |
| Rated Flow | 80 l/min |
| IP Rating | IP 56 |
| Offshore Rating | Sea State 6 |
| Wire Size | 36 mm |
| Client | Fugro Singapore Marine Pte. Ltd. |
| Year of Build | 2020 |
Subsea structure landing and recovery
Geotechnical sampling rigs
ROV launch-and-recovery systems
Deepwater drilling top-drive compensation
Full Passive Heave Compensator series datasheet — 600 T flagship plus drill-string heave compensation and Swiftwave Tensioner references.
From feasibility through commissioning — Dimension delivers in-house engineered marine equipment, backed by 14+ years of offshore operations.
