Pipe in Pipe Repair Solutions | Connector Subsea Solutions

Specialist clamp and connector systems engineered to restore structural integrity and functionality across complex pipe‑in‑pipe (PiP) networks.

Pipe‑in‑pipe (PiP) systems present unique challenges due to their multi‑layered construction and the complex interactions between the inner flowline, annulus, and outer casing. Effective repair requires precise engineering to address additional failure modes and restore full system performance.

Connector Subsea Solutions (CSS) designs and delivers bespoke PiP repair methodologies based on system configuration and field conditions. Our clamp and connector solutions restore pressure containment, structural capacity, and insulation properties while maintaining the original functionality of the PiP system. CSS provides a complete range of solutions to cover all PiP architectures and operating environments, from shallow‑water tiebacks to deepwater production systems.

PIPE‑IN‑PIPE REPAIR ENGINEERING APPROACH

Each repair begins with a detailed assessment of PiP construction, including interface conditions between the inner and outer pipes, overall geometry, and annulus access. CSS engineers then select the most effective methodology to suit the specific PiP configuration, ensuring minimal disruption, efficient installation, and long‑term integrity restoration.

CLAMP SOLUTIONS FOR CONTAINMENT AND STRENGTH

CSS clamp systems are designed to restore pressure containment and structural reinforcement at targeted locations on both the inner and outer pipe. Each system can be adapted to complex geometries such as PiP joints or variable wall thicknesses.

Key capabilities include:

Leak sealing and structural reinforcement for both pipes
Integration of injection and purge ports to dewater the annulus
Injection of corrosion inhibitors or preservation fluids within the annulus
Design options for installation over complex PiP features or in constrained environments

These permanent clamp solutions maintain the system’s insulation layer integrity while restoring sealing performance and mechanical strength.

Leak sealing and structural reinforcement for both pipes
Integration of injection and purge ports to dewater the annulus
Injection of corrosion inhibitors or preservation fluids within the annulus
Design options for installation over complex PiP features or in constrained environments

CONNECTOR SOLUTIONS FOR SYSTEM REINSTATEMENT

When a cut and section replacement is required, CSS connector systems provide a robust and permanent reinstatement option. The installation design accounts for the specific PiP construction, carefully managing where the outer pipe is removed and minimising or eliminating seawater flooding in the annulus.

The connector solution focuses on restoring the inner flowline and, where necessary, interfaces with the outer pipe to re‑establish full structural and pressure capability. CSS employs a range of elastomeric, graphite, collet‑gripping, and ball‑and‑taper sealing technologies depending on the application and operating pressure.

Each connector typically terminates with a standard flange or hub connection, enabling seamless integration of a new spool piece or component. Injection/purge functionality can also be built in to dewater the annulus and introduce corrosion inhibitors for long‑term protection.

COMPLETE SOLUTIONS FOR ANY PiP SCENARIO

From life‑extension interventions to emergency repairs, CSS has the engineering experience and technology to address every aspect of a pipe‑in‑pipe (PiP) integrity challenge. Our field‑proven MORGRIP^® connector technology, combined with purpose‑designed installation tools and diverless deployment options, ensures safe, rapid, and lasting restoration of system functionality.