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CASE STUDY
4.5”, 6”, 10” and 14” Structural Sealing Clamps for PAG
We have been contacted by PAG Oilfield Engineering to deliver repair clamps to CNOOC in China as the end customer. The clamps were meant to be stored as an EPRS and the scope consisted of 4 split structural sealing clamps for 4.5”, 6”, 10” and 14” rigid flowlines. All the clamps were designed for high pressure and ultra deep water (2000 m).
All the clamps consisted of double compression packers to ensure complete sealing of a potential leakage area and, for structural support, gripping elements able to withstand full end cap loads. The four clamps were designed for ultra-deep water and high pressure, and each clamp had its own installation frame with buoyancy elements attached. Both assembly and testing took place in Norway.
To meet the end customer’s requirement for DNV type approval, we successfully obtained certifications for all clamps. This not only validated the design’s functionality and the efficiency of our manufacturing and testing processes but also streamlined future orders and design iterations.
Challenges
Both sealing and structural elements
High pressure (115 – 383 bar) and ultra deep water (2000 m)
Special containers designed for transportation and long-term storage
Outcome
4 different spec clamps with sealing and structural properties
Installation frames for all clamps
Product certification (DNV type approval) for the solution
Delivered in time and within budget
CNOOC specialists trained for EPRS installation
As the solution was delivered under an EPRS scope, installation could potentially occur over an extended timeframe. To address this, we designed custom containers not only for safe transport but also for long-term storage of the clamps. Additionally, our engineers provided hands-on training to CNOOC’s specialists, covering operation, basic maintenance, and installation coordination, and enabling the customer to respond swiftly when required.
