Subsea Connection Systems

Our portfolio of field-proven connection systems provides reliable solutions that continue to evolve to meet the diverse needs of your global operations, from routine to extreme.

Robust, field-proven solutions 

We meet your needs with robust connection solutions engineered to increase efficiency, deliver cost savings, and operate reliably. 

Our solutions are tailored to suit your operational requirements, and to meet the demands of both shallow-water and deepwater applications.

Flowline Connection Systems

Our flowline connection systems provide cost-effective subsea connection solutions and are based on our proven Oceaneering® Grayloc® metal-to-metal sealing technology.

These connectors use a single drive screw and a standard API torque bucket for makeup by an industry-standard, remotely operated vehicle (ROV) torque tool. The vertical flowline connector does not require a bespoke installation tool, and provides an economical solution that requires fewer ROV trips to complete tie-ins.

  • Small footprint minimizes real estate occupied on subsea trees or infrastructure
  • Cost-effective, reliable, field-proven design
  • Easy-to-install, diverless installation
  • Turnkey jumper solutions available
  • Connector intervention ROV tooling available

Connection System Videos

M5 Connection System

Our highly reliable M5 connection system provides an easy-to-install connection solution that enables injection of gas or chemicals into subsea infrastructure and serves as an access point for future intervention during the life of the field.

With an unmatched Grayloc metal-to-metal sealing technology that can provide 25 make and break cycles, the M5 connector is suitable for long-term subsea deployment in vertical and horizontal orientations, and can be used in various mono-bore service line applications.

  • Gas lift injection
  • Chemical injection
  • Flow assurance
  • Hydrate remediation
  • Wellbore stimulation
  • Installation, workover, and control systems (IWOCS)

Our turnkey jumper solutions optimize interface management and cost efficiency. Our connectors are designed specifically to withstand forces of rigid jumpers and the latching design is based on our highly reliable M Series junction plates. No special tooling is required for seal installation and removal and the connector make-up via latch-on eliminates the requirement for subsea threading.

  • Bore sizes: Up to 3 inches
  • Conduit: Highly collapse-resistant thermoplastic hoses, composite pipe, bundled steel tube umbilical, flexible flowline, coiled tubing
  • ROV-friendly: Does not require specialized tooling
  • Ancillary equipment available: marine growth covers, intervention panels, fluid-retaining caps


Save Money and Time with Subsea Seal Replacement

The M5 connector design enables subsea seal replacement, eliminating the need to recover the connector topside for seal change out. The innovative M5 subsea seal-replacement panel supports subsea seal replacement and can be mounted onto an ROV cage or a subsea structure.

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Pig Launchers and Receivers

Our subsea pig launchers eliminate the requirement for a service flowline and reduce field development costs. Subsea and surface-loadable, our ROV- and remotely-operated configurations accommodate your requirements for pig capacities and types. Our solution for remotely operated subsea pig launching was awarded a Hart’s E&P Special Meritorious Award for Engineering Innovation.

Pipeline Terminations, Manifolds, and Jumper Systems

Our comprehensive portfolio of intervention tooling and engineering services addresses your most complex operational considerations. As a one-stop shop for complete systems, we deliver solutions that effectively reduce vendor management and interface risk.
  • ISO- and API-compliant designs
  • Reduced vendor management and interface risk
  • Field-proven, complete solutions deployed globally
  • Jumper systems that integrate various flowline, chemical injection, and gas lift connector systems

Grayloc Products

Our Grayloc products deliver industry-leading solutions for connecting critical-service piping and vessel systems. Grayloc connections enable design optimization, cost efficiency, and reduced installation and maintenance times.
  • Reduced maintenance with leak-free, field-proven design
  • Conserve space and reduce weight with compact footprint
  • Faster installation, assembly, and disassembly
  • Incorporate easily serviceable and reusable components
  • Minimize spare parts inventory
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Contact Us | Subsea Connection Systems

Company page Since our founding in the early 1960s, Oceaneering has expanded and grown globally to service several industries such as the offshore energy industry, defense, entertainment, material handling, aerospace, science, and renewable energy industries. In 1964, Mike Hughes and Johnny Johnson formed a Gulf of Mexico diving company called World Wide Divers. The company grew in response to increasing demand for their services and in 1969 merged with two other diving companies to form Oceaneering International, Inc. To solve the toughest challenges, we do things differently, creatively, and smarter. As your trusted partner, our unmatched experience and truly innovative portfolio of technologies and solutions give us the flexibility to adapt and evolve, regardless of market conditions. Our mission is to solve the unsolvable. We thrive by creating industry-changing technically creative solutions for the most complex operational challenges under water, on land, and in space. Our five core values establish a common culture and demonstrate what is most important for us as a company. Since the beginning, the company has transformed from a small regional diving company into a global provider of engineered products and services. Today, we develop products and services for use throughout the lifecycle of an offshore oilfield, from drilling to decommissioning. We operate the world's premier fleet of work class ROVs. Additionally, we are a leader in offshore oilfield maintenance services, umbilicals, subsea hardware, and tooling. We also serve the aerospace, defense, and theme park industries. Underpinning everything we do, safety is not only the foundation of our core values, but it is vital to our unmatched performance record and company culture. The industries we serve are as diverse as they are complex. Whether we are engineering deepwater umbilicals or developing robotics for aerospace applications, the safety and health of our employees, vendors, and customers is an integral part of our day-to-day business. If we are working, then our responsibility is to be working safely. Since our inception in 1964, we have placed a high value on employee safety—from diving services and subsea inspection to vessel-based installation operations. We have and will continue to evolve not only our health, safety, and environmental (HSE) processes, but those of the industries in which we work. Although we have been fatality-free since 1999, our HSE journey goes beyond statistics. As our portfolio of services has grown, we have continued to prioritize and advance our approach to HSE.