How Is Underwater Flange Torquing Performed? | Pipeline Connection Guide
Underwater flange torquing is a precision process used to ensure leak-proof and secure connections in subsea pipelines. It involves tightening flange bolts to specific torque values and plays a vital role in the long-term integrity of underwater systems.
What Is Underwater Flange Torquing?
Flange torquing is the process of joining two flange faces by tightening bolts and nuts with a specific amount of force. In underwater environments, this is done using specially designed hydraulic torque wrenches and diver tools. The goal is to ensure sealing and prevent over- or under-tightening of the connection.
Step-by-Step Torquing Process
- Preparation: Flange surfaces are cleaned, gasket is placed, and bolts are inserted.
- Torque Value Determination: The correct torque is calculated based on pipe type and gasket material.
- Tool Positioning: Divers align the hydraulic torque wrench with the bolts.
- Symmetrical Tightening: Bolts are tightened in a criss-cross pattern to evenly compress the gasket and distribute the load.
- Inspection and Testing: The connection is visually inspected and tested for leaks via pressure testing.
Equipment Used
- Hydraulic torque wrench
- Diver support systems
- Torque control unit with pressure gauges
- Gaskets and stainless steel fasteners
- Underwater communication systems
Common Challenges
Underwater torquing often faces challenges such as poor visibility, strong currents, oxidation, and alignment difficulties. Skilled divers and real-time monitoring systems are essential to overcome these obstacles.
Conclusion
Underwater flange torquing directly affects the safety and efficiency of pipeline systems. When performed with the correct tools and procedures, it ensures durable and leak-free connections. This process is a reliable solution in energy and marine infrastructure projects.