Gas Lift Couplings
1½" Nominal Bore Subsea Gas Lift Couplings
MSCM gas lift couplings are 1½" nominal bore connectors incorporating an integral self-sealing check valve that eliminates the possibility of hydrate formation during deployment and intervention. Designed for multiple make and break under system working pressure across a 25-year design life.
Working Pressure
Connector Type
This unique 1½” nominal bore coupling incorporates an integral self-sealing check valve which eliminates the possibility of hydrate formation during deployment and interventions. The fixed male half is mounted to the subsea structure, such as a xmas tree or manifold, and is connected to the distribution system via an API flange or similar. The free female half carries a PEEK-energised primary seal with a resilient seal redundant backup, and is designed for multiple make and break under system working pressures across a 25-year design life.
ROV deployment and intervention is free flying using a work class ROV in accordance with API 17D / ISO 13628-8 Class 4 receptacle. The free half has a flexible thermoplastic jumper attached via a grayloc hub assembly. Parking receptacles, pressure-retaining caps and test couplings are available to support handling and verification.
While engineered for gas lift service, the coupling may also be used with all commonly used service media, including methanol injection and water and oil based control fluids. The typical gas composition handled is predominantly Methane (81.57%) with Propane (4.31%), n-Butane (2.3%) and trace components.
Key Features
- 1½" nominal bore with integral self-sealing check valve
- Eliminates hydrate formation during deployment and intervention
- PEEK-energised primary seal with resilient redundant backup
- Free-flying ROV deployment per API 17D / ISO 13628-8 Class 4 receptacle
- Fixed male or free female coupling configurations
- Parking receptacles, pressure-retaining caps and test couplings available
- 25-year design life with multiple make and break capability
Applications
- Subsea distribution of gas lift supply from manifolds and xmas trees.
- Compatible with methanol injection, water and oil based control fluids.
- Free-flying ROV make and break under system working pressure.
Frequently Asked Questions
How does the coupling prevent hydrate formation?
An integral self-sealing check valve closes the bore during deployment and intervention, eliminating the seawater ingress and pressure conditions that allow hydrates to form in gas service.
What flow and pressure is it rated for?
A 1½" nominal bore flowing up to 300,000 sm³/day at a 448 BAR system working pressure (672 BAR test), with a 90°C design temperature and 25-year design life with multiple make and break capability.
How is it deployed subsea?
Free-flying by work-class ROV to an API 17D / ISO 13628-8 Class 4 receptacle. The fixed male half mounts to the tree or manifold via an API flange; the free female half arrives on a flexible thermoplastic jumper via a grayloc hub.
How is sealing arranged?
The free half carries a PEEK-energised primary seal backed by a redundant resilient seal, designed for repeated make and break under system working pressure.
Is it only for gas lift service?
No — while engineered for gas lift, it can be used with all commonly used service media, including methanol injection and water- or oil-based control fluids. Parking receptacles, pressure-retaining caps and test couplings are available to support operations.
