Subsea Mechanical Connector Cross Section

2 - 48" Size Range
345 bar+ Pressure Rating
Approved DNV Product Approval
100% Leak-Free Service History

Subsea Mechanical Pipe Connectors

Weldless Alternative To Hyperbaric Welding

For Subsea Tie-Ins, Repairs And End-Capping.

Eliminate subsea hyperbaric welding and cut the cost and complexity of subsea pipeline interventions. Our SureConnect® subsea mechanical connectors provide a permanent, leak-free connection for pipelines, flowlines and risers, installed by divers or ROV without welding or hot work.

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SureConnect®
Configurations
Applications
Specifications
Codes & Standards

The High Cost Of Subsea Pipeline Repair

Subsea pipeline repairs are among the most costly and logistically demanding operations in oil and gas.

When a pipeline needs repair, tie-in or capping, the traditional approach requires hyperbaric welding - a process that demands saturation diving support vessels, highly specialised welding crews and extended periods of asset downtime.

To give subsea pipeline operators a faster, safer and more cost-effective alternative, STATS developed the SureConnect® - a subsea mechanical connector system that eliminates the need for hyperbaric welding entirely.

Case Study - Riser Flange Failure Contingency, North Sea UKCS

Integrity issue identified on a riser base flange during North Sea UKCS field development leak-testing. STATS manufactured two certified class 2500 subsea mechanical connectors as contingency. Primary repair succeeded; connector retained on standby.

8in Subsea Pipeline Isolation & Repair, Gulf of Thailand

Case Study - 8″ Gas Condensate Pipeline Repair, Gulf of Thailand

Anchor drag displaced an 8″ gas condensate pipeline in the Gulf of Thailand. STATS isolated and repaired the live line at 60m using BISEP technology and subsea mechanical connectors. Zero production impact; all three connectors tested at 56 bar.

Subsea Connector Coupling Flange

SureConnect®: A Safer, Faster Subsea Connection

Planning and mobilising a saturation diving spread takes time. Dive support vessel day rates are substantial. The costs mount quickly.

Extended out-of-service periods hit production directly. And working under pressure in hostile subsea conditions carries inherent safety risks that operators are looking to reduce at every opportunity.

Conventional mechanical connector designs can also introduce their own complications. Some require specialist installation or activation tools that have to be sourced and transported to location - adding cost and creating schedule risk when projects overrun. Others rely on deforming the pipe to achieve a seal, which can introduce localised stress concentrations and increase corrosion risk over time.

SureConnect is the subsea mechanical connector system that eliminates the need for hyperbaric welding entirely.

The SureConnect slips over bare pipe ends and is secured by a mechanical locking assembly that delivers a permanent, flanged connection without welding or hot work. Once in position, the external grip lock applies even, distributed pressure across a large contact area - avoiding pipe deformation, preventing localised stress and preserving the integrity of the parent pipe.

The result is a connection that meets or exceeds the design criteria of the host pipework, with a minimum design life that gives operators confidence in long-term performance.

The dual seal design features independent activation of seals and taper locks, allowing installation to proceed in controlled sequential steps. An integrated annulus test port sits between the two seals, providing direct access to carry out a pressure test once the connector is fully installed - confirming integrity before the pipeline is returned to service. A DNV Pipeline Component Product Certificate in accordance with DNVGL-SE-0499 is available on request for operators with specific certification requirements.

Subsea Mechanical Pipe Connectors

SureConnect: What You Need To Know

Key Benefits

Eliminates the need for hyperbaric welding - eliminating the cost, safety risk and logistical overhead of saturation diving operations
Supports installation by divers with basic training or ROV installed - adaptable to your available assets and intervention window
Features a dual seal design with independent activation of seals and taper locks for reliable, sequential pressure testing
External grip lock and seal assembly distributes load evenly without deforming pipework, preserving flow and preventing turbulence
Integrated annulus test port between seals allows in-situ leak testing once installation is complete - confirming integrity before return to service
Rated for sour service and a wide range of process fluid types across deepwater and shallow-water environments
DNV Type Approved design, with options up to 5000# available on request
All components externally coated to resist corrosion in hostile subsea operating environments

Mechanical Connector Independent Locks & Seals

Subsea Connector Plain-End Pipe to Flange Connection

Installation can be carried out by divers with basic training. For assets in deeper water or where diver access is restricted, ROV installed options are available - giving operators the flexibility to match the installation method to their available assets and project schedule.

All SureConnect components are externally coated to withstand the corrosion and pressure demands of hostile subsea environments. Seals and materials are rated for sour service and compatible with a wide range of process fluids and flow conditions, making SureConnect suitable for deepwater and shallow-water tie-in, repair and end-capping projects.

Configurations, Applications, Specifications and Standards

SureConnect Configurations

The SureConnect is available in three configurations. Each slides over bare pipe ends and is activated by the same bolted mechanical locking assembly, with an integrated annulus test port to confirm seal integrity once installed.

Configuration Options

END CAP: For capping plain-end redundant pipework. The SureConnect end cap provides a permanent, pressure-tested seal on open pipe ends - used in pipeline abandonment, decommissioning and section removal projects where the exposed end needs a long-term, maintenance-free closure.
FLANGE: For connecting plain-end pipe to a flanged termination. Used for tie-ins where an existing flange interface is already in place. A misalignment flange interface is available where angular alignment cannot be guaranteed - useful in repair scenarios where pipe position cannot be corrected before connection.
COUPLING: For connecting plain-end pipe to plain-end pipe. Used for section repairs and pipeline tie-ins where both pipe ends are bare. The coupling spans the connection point and is activated from the outside, with no internal bore intrusion and no requirement for hot work.

Subsea Coupling Plain-End Pipe to Plain-End Pipe

Subsea Connector End Cap

SureConnect Applications

The SureConnect has been deployed across a range of challenging real-world scenarios - from emergency contingency manufacture for North Sea, UKCS field developments to complex multi-tool repairs on live, pressurised pipelines in the Gulf of Thailand.

Subsea pipeline section repair following damage or corrosion
Pipeline tie-in for new infrastructure connection
Valve installation on live or isolated lines
Pipeline modification and rerouting
Pipeline abandonment and end-capping

Operators across the North Sea, Asia Pacific and beyond rely on SureConnect for permanent subsea connections. Every connector delivered carries a 100% leak-free service history.

Subsea Connector End Cap

SureConnect Specifications

Available Materials

Carbon steel and stainless steel as standard. Duplex and super duplex available on request. Alternative sealing materials available to suit specific process requirements.

All materials are rated for sour service.

SIZE RANGE: 2″ to 48″
MAXIMUM PRESSURE: 345 bar+ (higher ratings available on request)
DNV TYPE APPROVAL: Up to 300# standard. Up to 5000# available on request
DNV PRODUCT CERTIFICATE: In accordance with DNVGL-SE-0499 (optional, on request)
SEAL MATERIAL: Hydrogenated Nitrile Butadiene Rubber (HNBR) as standard. Alternatives available on request
PIPE MATERIALS: Carbon steel, stainless steel standard. Duplex on request
SOUR SERVICE: All materials rated suitable
INSTALLATION METHOD: Diver (basic training) or ROV installation
EXTERNAL COATING: Norsok M501 System 7

14" Subsea Mechanical Connector

14in Subsea Mechanical Connector Close Up

SureConnect Codes & Standards

DNVGL-ST-F101: Submarine Pipeline Systems
ASME BPVC, Section VIII, Div 2: Boiler and Pressure Vessel Code
ASME B31.8: Gas Transmission & Distribution Piping Systems
API 5L: Specification for Line Pipe
ASME B16.5: Pipe Flanges and Flanged Fittings

Subsea Connector

Local Everywhere

Instead of flying people and equipment all over the world, we've set up fully-functional bases in nine strategic locations. These bases enable us to employ local technicians, work with local manufacturers, and invest in local economies. They're a significant investment, but our regional bases are key to delivering the best possible service for our clients - and minimising the environmental impact of our work.

2 - 48" Size Range

345 bar+ Pressure Rating

Approved DNV Product Approval

100% Leak-Free Service History

Weldless Alternative To Hyperbaric Welding

Jump To Section:

The High Cost Of Subsea Pipeline Repair

Case Study - Riser Flange Failure Contingency, North Sea UKCS

Case Study - 8″ Gas Condensate Pipeline Repair, Gulf of Thailand

Subsea Connector Coupling Flange

SureConnect®: A Safer, Faster Subsea Connection

SureConnect: What You Need To Know

Key Benefits

Mechanical Connector Independent Locks & Seals

Subsea Connector Plain-End Pipe to Flange Connection

SureConnect Configurations

Configuration Options

Subsea Coupling Plain-End Pipe to Plain-End Pipe

Subsea Connector End Cap

SureConnect Applications

Subsea Connector End Cap

SureConnect Specifications

14" Subsea Mechanical Connector

SureConnect Codes & Standards

Subsea Connector

Local Everywhere

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Subsea BISEP® Line Stopping Tool

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