Passive heave compensators, drill-string heave compensation and line tensioners that decouple vessel motion from the load. Seven builds from 20 T to 600 T, designed to API Spec 2C and class-approved.
Passive heave compensators and line tensioners for offshore lifting and subsea line-weight compensation, plus semi-active drill-string compensation for geotechnical drilling. Stroke and load are customisable on every build.
Flagship self-contained passive heave compensator for heavy offshore lifts.
Hydro-pneumatic lifting link with two independent load set-ups.
Moving-sheave line tensioner for subsea line-weight compensation.
| Parameter | 600 T PHC | 50 T PHC Lifting Link | 20 T Swiftwave SH20H |
|---|---|---|---|
| Safe working load | 600 T | 50.0 MT | 20 T (on cable) |
| Test load | 900 T | — | — |
| Stroke / compensation | 3.0 m (customisable) | 3.0 m max | 3.2 m max (± 1.6 m) |
| System | Gas-pressure / hydraulic spring damper | 1 cylinder + 2 piston accumulators | Moving sheaves, MRU, cylinder + accumulator |
| Dimensions | 2.900 × 2.200 × 7.863 m (L × W × H) | — | 4.2 × 0.8 × 0.8 m (L × W × H) |
| Weight | 20.0 T (approx.) | — | 1.2 MT |
| Rated pressure / flow | — | — | 250 Bar / 80 l/min |
| Class / rating | DNV / LR / ABS | DNV | IP 56 · Sea State 6 |
| Client · year | — | Singapore Salvage Engineers · 2018 | Fugro Singapore Marine · 2020 |
Dual-ram semi-active system in the GMTR-150 twin-tower rig.
Dual-ram semi-active sister build to the GMTR-150 system.
Static / dynamic rated system with anti-recoil speed control.
Compact single-ram entry point to the drill-string range.
| Parameter | 150 MT HC | 120 MT HC | 60 T HC | 30 T HC |
|---|---|---|---|---|
| Max static load | — | — | 60 MT | — |
| Max dynamic load | 120 MT | 120 MT | 50 MT | 30 MT |
| Max stroke | 6 m | 6 m | 3.0 m | 3.0 m |
| System | Dual-ram semi-active | Dual-ram semi-active | — | Single-ram semi-active |
| Equipment protection | Olmsted Valve Slingshot | Olmsted Valve Slingshot | Anti-Recoil Speed Control | Olmsted Valve Slingshot |
| Class / standard | Lloyd's LAME 2009 | Lloyd's LAME 2009 | ABS | Lloyd's LAME 2009 |
| Client | Geoquip Marine AG | Geoquip Marine AG | COSL | Geoquip Marine AG |
| Year of build | 2015 | 2014 | 2019 | 2015 |
The flagship of the PHC series, built for heavy offshore lifts in offshore wind, renewables and oil & gas. A gas-pressure / hydraulic-fluid spring damper does the compensating, with no HPU or external connections. Stroke and load range can be tailored on the same modular platform.
| 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 |
A large hydro-pneumatic spring in lifting-link form that damps the shock loading of surface-to-surface lifts. One hydraulic piston cylinder works with two piston accumulators on independent circuits, so the link can be set up for two distinct loads. Built for Singapore Salvage Engineers.
| 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 |
A line-tension compensator for heavy loads in adverse weather and deep water, built for Fugro Singapore Marine. Moving sheaves, an MRU and associated controls compensate subsea line weight during geotechnical drilling and testing. The current configuration is sized for 36 mm wire.
| 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 |
A dual-ram semi-active system rated at 120 MT maximum dynamic load on a 6 m stroke, integrated into the GMTR-150 twin-tower geotechnical drill platform on the Fukada for Geoquip Marine AG. It was delivered as part of a complete deepwater drilling spread.
| 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) |
A dual-ram semi-active system rated at 120 MT maximum dynamic load on a 6 m stroke. Dimension engineered, built and commissioned it for Geoquip Marine AG in 2014, and it is the sister build to the 2015 GMTR-150 system.
| 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 |
Delivered to China Oilfield Services Limited (COSL) in 2019. Rated at 60 MT maximum static and 50 MT maximum dynamic load on a 3.0 m stroke, it is the ABS-classed member of the drill-string range.
| 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 |
The compact entry point to the drill-string range: a single-ram semi-active system rated at 30 MT maximum dynamic load on a 3.0 m stroke. Built for Geoquip Marine AG in 2015.
| 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 |
Dimension has designed and built heave compensation systems in-house since 2012: passive, semi-active and hybrid. Every build is marine-coated for −10 °C to +50 °C and 95% humidity.
A spring damper on nitrogen gas pressure and hydraulic fluid (mineral oil ISO VG32-68) compensates without outside power.
PHC units need no external hoses, wires or special lifting frames.
Decoupling vessel motion from the load extends workable sea states and cuts wear on crane wire and crane system.
Olmsted Valve Slingshot or Anti-Recoil Speed Control protects drill-string systems and the equipment around them.
Engineered to API Spec 2C and approved by DNV, LR, ABS or to Lloyd's LAME 2009.
Stroke and load envelope tailored per project, with units available for rental or purchase.
The 150 MT drill string heave compensation system was delivered within a complete deepwater geotechnical drilling spread: main hoist rams, 6 m compensator rams, a 150 MT power swivel, CPT & SBF umbilical winches, SBF compensation, traction winches, iron roughneck and HPU / control modules.
Dimension compensation builds have also been delivered to China Oilfield Services Limited, Singapore Salvage Engineers and Fugro Singapore Marine, alongside two further drill-string systems for Geoquip Marine AG.
From feasibility through commissioning — Dimension delivers in-house engineered marine equipment, backed by 14+ years of offshore operations.
