Introduction

The main feature of pipe-in-pipe and pipeline bundle systems is that the pipeline is comprised of concentric inner and outer pipes. The inner pipe or pipes within sleeve pipes carry the production fluids and are insulated, whilst the outer pipe or carrier pipe provides mechanical protection.

Pipe-in-Pipe insulation is typically a low density polyurethane foam product applied by either injection moulding or spray application. This provides a highly efficient insulation performance in both shallow and deepwater applications.

 

Notable Projects

Project Name
Project Number
Notes
BAOBAB
Notable due to the Pipe in Pipe nature
Greater Plutonio
Deep Water, using SAFEBUCK
Qatar Gas
KW

Large Diameter Pipe
Shallow Water
Snake Lay Solution

 

Other Projects

Project Name
Project Number Notes
EPC2B
KW 0728
Controlled Buckles on Existing Pipeline Crossings
Algeria Pipeline
KW 1071
Onshore
Deep Panuke
 

 

Codes & Standards

Company
Title
Doc Number / Date
SAFEBUCK JIP
Safe Design of Pipelines with Lateral Buckling - Design Guideline
DNV
Global Buckling of Submarine Pipelines
DNV-RP-F110
DNV
Submarine Pipeline Systems
(Strain Based Limit State)
DNV-OS-F101

 

Course Notes

Author
Title
Notes
C. Sicilia
Lateral Buckling Assessment and Mitigation Design
Trevor Gee
IBC
Pipeline Course

 

Books

Author
Title
Chapter
Mikael Braestrup
Design and Installation of Marine Pipelines
6.5

 

Papers

Author
Title
Notes
Hobbes, R. E.
In-service Buckling of Heated Pipelines, Journal of transportation Engineering, ASCE, Vol. 110, No.2, March 1984, pp. 175-189
Approximate method for determining propensity for lateral buckling
Taylor, N. and Gan, A. B
Submarine pipeline Buckling – Imperfection Studies, Jour. Of Thin-walled Structures, Vol. 4, 1986, pp 295-323
A developed version of ‘Hobbs’, including the effects of initial OOS

 

Prepared Calculations

Title / Software
Description
Owner / Athor
Hobbs / Excel
Predicts the onset of buckling
KAJW / CSG

 

Related Subjects

Expansion

Lateral Buckling

Pipe in Pipe Systems

Return

After installation a survey is usually conducted to determine the vertical profile of the pipeline and the amount of soil/rock cover. This information is used to determine if further cover is required to ensure that the pipeline will not be susceptible to upheaval buckling.