SMD Quasar: The Heavy-Lift Work-Class ROV for Subsea Construction

When the task is burying a pipeline, cutting a concrete mattress, or deploying a jetting sled in 2,000 metres of water, the ROV specification that matters most is raw hydraulic power. The SMD Quasar — built by Soil Machine Dynamics in Newcastle — was designed from the outset for exactly those demands. It sits at the top of the SMD product family above the Quantum and Atom, and contractors reach for it when the job genuinely cannot be done with a smaller platform.

SMD and the Quasar Platform Origins

Soil Machine Dynamics was founded in 1971, originally focused on seabed trenching machines before expanding into work-class ROV design. The Quasar emerged from that trenching heritage — the company understood high-torque, high-flow hydraulic systems before most ROV manufacturers existed. The Quasar's architecture carries that DNA: it is a vehicle designed to deliver power to the tooling, not merely to carry a camera to depth. SMD's integration of vehicle and tool system design is one reason contractors working on cable burial and inter-array cable installation specify Quasar-class vehicles.

Power System: 250 hp and Above

The Quasar platform's total installed hydraulic power typically exceeds 250 hp (approximately 186 kW) delivered at the vehicle frame. This is not the surface topsides power figure — it is the hydraulic output available at the ROV itself after transmission losses through the umbilical. The surface power delivery to the system runs considerably higher, accounting for transmission losses and auxiliary loads. In practical terms the vehicle can simultaneously drive a high-flow jetting pump, operate two manipulators, maintain station against a 2-knot current, and power active sonar — without forcing the pilot to prioritise between systems.

Hydraulic Architecture and Flow Rates

• Primary hydraulic circuit: typically 207–241 bar working pressure, variable displacement axial piston pumps
• Auxiliary tooling circuit: separately regulated, configurable between 103 and 172 bar for sensitive tooling
• Total system flow: 200+ litres per minute available at maximum demand
• Tooling skid integration: ISO 4401 hydraulic interfaces for client-supplied tooling
• Proportional valve manifolds: pilot-operated, allowing smooth ramp rates for manipulator control
• Redundant hydraulic motors on each thruster: fail-in-place design, single thruster loss does not abort the dive
• Hot-stab receptacles: minimum two primary and two secondary, forward-accessible from either manipulator

Construction and Trenching Applications

The Quasar's power budget enables tooling that smaller work-class ROVs cannot sustain. Cable burial jetting sleds operating at depth require flow rates that would stall a 100 hp platform mid-operation. Rock dump monitoring in active ROV-guided operations requires continuous station-keeping against vessel wash while operating sonar and video simultaneously. Concrete mattress cutting using hydraulic shears demands peak instantaneous flow. The Quasar handles all three without system-level compromise. SMD's background in seabed intervention machines means the vehicle integration with cable-lay tooling is mature — pilots report that the hydraulic interfaces behave predictably because SMD engineered both sides of the connection.

Dual Manipulator Configuration

The standard Quasar build carries a 7-function master-slave manipulator on the starboard side and a 5-function manipulator or grabber arm to port. The 7-function arm provides full shoulder rotation, upper arm rotation, elbow, wrist bend, wrist rotate, jaw open/close, and jaw rotate — sufficient for torque tool operation, hot-stab insertion, and valve actuation without changing tooling. The port arm's configuration is project-specific: contractors running pipeline repair specify a manipulator with jaw size matched to the pipe diameter range; cable burial campaigns often fit a heavy-duty blade assembly instead. The frame interface for both arms uses the SMD proprietary mounting standard, and tool-change at the surface turnaround is achievable within a thirty-minute deck window with a trained crew.

Quasar vs. Oceaneering Millennium Plus for Construction Tasks

The Oceaneering Millennium Plus is the other heavy work-class platform contractors compare directly against the Quasar when pricing construction campaigns. Both platforms operate in the 150–300 hp installed power range and both carry 7-function manipulators. The differences are primarily in hydraulic architecture maturity and tooling ecosystem. Oceaneering's Millennium series has a larger global fleet, which means spare parts are available at more ports — a meaningful consideration for remote campaigns. SMD's Quasar has a tighter integration between vehicle hydraulics and SMD-supplied trenching tooling, which matters when the tool system is also SMD-built. Contractors running SMD mass flow excavators alongside an ROV typically specify the Quasar for the vehicle/tool interface commonality. Contractors whose primary concern is vessel compatibility and global spare parts availability often default to the Millennium Plus.

Power Management During High-Demand Operations

At full tooling demand, the Quasar system draws power at a rate that requires active management from the surface power supply. Most vessel installations use dedicated ROV transformers feeding a variable-frequency drive (VFD) power management unit on the topsides. During jetting operations, the pilot and topside engineer communicate in real time about load balancing — sonar processing, lighting, and video compression are the first loads shed if tooling demand peaks. The Quasar's onboard power management module tracks aggregate demand and provides early warning before the surface breaker panel sees an overload condition. Pilots experienced on Quasar-class vehicles develop an intuitive sense of when to back off the jetting pump flow rate to prevent a nuisance trip.

When Contractors Choose Quasar Over Other Platforms