Minggu, 01 Februari 2015

Pipe-in-Pipe

Flow Assurance
Insulation Capabilities
Pipe-in-Pipe Overview
Pipe-in-Pipe Offshore Construction
1. Fixed
  • suitable for majority of lay vessels
  • field joint uses bulkheads or swaged connectors, no movement between flowline and carrier pipe
  • permits vacuum in annulus
  • heat loss from flowline to carrier pipe through metal connectors
2. Sliding
  • S-lay & J-lay
  • uses a butt weld on carrier pipe and allows the flowline to move freely
  • flowline may or may not have alignment spacers
  • thermal insulation may be on the outside if flow-through-annulus active heating is used
3. Restrained
  • polymer bulkheads to hold insulation material in place
  • these bulkheads transfer the load during installation and provide concentric alignment
Deepwater Pipe-in-Pipe
Active Heating Pipe-in-Pipe



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