Application Note: Pressure Relief Valves and Purge Ports
was pressure compensated to ambient pressure at operating depth using dry, compressed air. Two pressure relief valves, one a back-up for the other, vented internal air pressure as the system ascended to the surface at the end of the experiment. The PRVs were placed high to vent air, while the hydraulic oil was low and therefore not exhausted into the ocean. A graphite burst disk provided a third emergency pressure relief method which gratefully never ruptured. The two PRVs, positioned at the 10 and 2 o’clock positions, always worked.Post-deployment, however, a saltwater trail was evident
Ashtead Technology, Hydrollica to Provide Seawater Tooling Technology
of seawater-powered subsea tooling into Ashtead Technology’s global fleet, including the Hydro Multi-Tool, Hydro Micro Multi-Tool and Hydro PowerPack. These compact yet powerful tools are designed to deliver high performance across a wide range of subsea operations while replacing traditional hydraulic oil with seawater, significantly reducing environmental risk.Unlike traditional hydraulic systems, Hydrollica’s tooling operates using seawater, eliminating the need for hydraulic oil and reducing the risk of contamination. This innovation is particularly relevant as subsea operators across
James Fisher Signs Cooperation Agreement with OMS
exclusive cooperation agreement with Oil Management and Services GmbH (OMS). The combined and complementary expertise of JFMS and OMS will offer significant benefits to customers in the European offshore renewables industry, with the delivery of full oil lifecycle services, including gearbox and hydraulic oil change, enhancing the safety and performance of offshore wind turbines. Bruno Martinsen, owner of OMS, commented; “This cooperation agreement will enable us to jointly provide turnkey oil management solutions to offshore renewable customers, including oil change, monitoring and maintenance
Tidewater Subsea Charters MV Brandon Bordelon
communications and ROV data network, plug and play, with patch panel racks installed. All systems are fully interfaced with the vessel systems, bridge, office and accommodation spaces. The vessel is designed with removable bulwarks around the entire aft of vessel along with power, water, air and hydraulic oil connections on the deck. The vessel is also equipped with four additional below deck Tier 3 generators, providing fully redundant power to the crane and ROV systems. Wes Bordelon, president and CEO of Bordelon Marine, commented, "We are very excited to work with Tidewater Subsea. Being
Bordelon Marine Takes delivery of ULIV
, extensive communications and ROV data network, plug and play, with patch panel racks installed. … all tied into the vessel systems, bridge, office, and accommodation spaces. The vessel is designed with removable bulwarks around the entire aft of vessel along with power, water, air, and hydraulic oil connections on the deck. The vessel is also equipped with four additional below deck Tier 3 generators, providing fully redundant power to the crane and ROV systems. Wes Bordelon, President/CEO stated, "We are very excited to introduce the M/V Brandon Bordelon. This vessel is the next
New Waterjet Cutting, Blasting System for ROVs
pressure waterjet technology.” The 100hp SUB-JET 3000 produces 7.5 liters per minute of 3900 bar ultra-high pressure water for cutting and blasting. It carries 35 liters of abrasive on the skid standard, which provides 30 and 90 minutes of cutting time. The ROV provides hydraulic oil to power the waterjet intensifiers and operate attached tooling, 24 Vdc (300 watts) for control power, and a fiber optic data link to the topside controller. The system requires between 150 and 200 liters per minute of hydraulic oil to run at full capacity but can be operated at lower output
New Subsea Piledriver Uses Seawater
IHC Hydrohammer, part of IHC Merwede has developed and tested a new technology which uses seawater instead of hydraulic oil. This sustainable product development minimises potential oil spill hazards in the marine environment and presents new opportunities for deep-water offshore pile driving that will be beneficial to the future growth of offshore construction. The S-90W IHC Waterhammer has been utilised in conjunction with Swiber Offshore Construction. The installation contractor used the advanced pile-driving hammer to install four foundation piles on the subsea PLEM (pipeline end manifold)
Polarcus Innovation in Seismic Vessel Design
one tunnel thruster aft, 830 kW, controllable pitch. The vessel is equipped with a roll damping tank system. There are two fresh water generators, each producing 15 cu.m./24h. There are two fuel oil separators, self cleaning type and three lube oil separators. In addition there is one mobile hydraulic oil separator and a USCG approved bilge water separator. A ballast water treatment system is installed. Switchboards, navigation and DP Ulstein Power & Control has delivered the switchboards 690V, 400V and 230V, the emergency switchboard, and the communication and information system type
February 2026
