Hose transfer operations in harsh offshore environments are at risk of tanker breakaway and internal surge pressures, causing oil spills and damage to hoses and fittings. To mitigate the risks of transfer operations Offspring International offers a range of marine breakaway coupling designs from leading producers.
Petal Valve Coupling
Breakaway couplings are an essential component in maintaining the environmental integrity of tanker offloading operations. Seamlessly integrated within the flexible hose string, petal valve couplings use flanged ANSI connections for direct bolting to hose end flanges, together with optional buoyancy units. The coupling is full bore ensuring uninterrupted flow and zero pressure loss.
On-site Reassembly After Activation
Its design makes the petal valve uniquely capable of on-site reassembly after activation and can be quickly back in service following an incident, reducing terminal downtime. There is no need to return the coupling to be reset.
Benchmark Setting Design
The coupling’s petal valve closure design sets a benchmark for minimal oil leakage and petal valve engineering integrity, while the forged metal construction is built to last. The coupling allows breakout load and surge pressure to be adjusted to suit specific SPM / terminal applications by changing the titanium alloy weak-bolts, without disassembling the unit, up to max 50 tons, equivalent to 40 barg of internal pressure.
The coupling separates when a pre-set load or internal pressure exceeds break bolt capacity, forcing the coupling apart. The central sleeve is pulled out allowing closure of the upstream petal valves within a few seconds, significantly reducing oil flow.
Next the four smaller petals close – closure time is adjustable to suit flow requirements – completing upstream valve closure. Two-stage petal valve closure provides optimal anti-pressure surge protection. Continued axial load forces the second set of weak bolts to break, allowing the sleeve to separate and activate the downstream valve petals.
The coupling uses a novel system of pre-set spring dampeners for the two-stage closure, allowing complete closure times to be adjusted to suit each installation. There is no leakage of hydraulic oil into the sea.
Flip Flap Coupling
The Flip Flap marine breakaway coupling offers passive monitoring of floating hoses and protection from excessive axial load and surge pressures. The standard coupling configuration comprises two sets of Flip Flap disc valves positioned either side of a calibrated titanium alloy weak-bolt flange assembly.
The two halves of the Flip Flap separate once either a pre-set load, internal pressure, or combination of both activates the weak-bolts. As the valves close liquid transfer is prevented, containing liquid within each section of the separated hose. The Flip Flap’s disc valves ensure 100% leak-free shut-off.
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