Download Introduction to Offshore Pipelines & Risers - Jaeyoung Lee PDF

TitleIntroduction to Offshore Pipelines & Risers - Jaeyoung Lee
TagsPipe (Fluid Conveyance) Pipeline Transport Subsea (Technology) Offshore Drilling Yield (Engineering)
File Size4.9 MB
Total Pages172
Document Text Contents
Page 1

Introduction to

Offshore Pipelines and Risers



2007


Jaeyoung Lee, P.E.

Page 86

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References
[1] Submarine Pipeline On-bottom Stability Analysis and Design Guidelines,

American Gas Association, 1993

[2] C.P. Ellinas, et. al., Prevention of Upheaval Buckling of Hot Submarine Pipelines
by Means of Intermittent Rock Dumping, OTC (Offshore Technology Conference)
Paper No. 6332, 1990

[3] Submar Website, www.submar.com, for concrete mattress

[4] Van Oord Website, www.vanoord.com, for rock dumping

[5] Jaeyoung Lee and Keh-Han Wang, "Stability of Pipeline under Oblique Waves,"
Oceans 2001, Honolulu, Hawaii, 2001

[6] Guideline for the Design of Buried Steel Pipe, ASCE, 2001,
http://www.americanlifelinesalliance.org/pdf/buried_pipe.pdf

[7] Guidelines for the Seismic Design of Oil and Gas Pipeline Systems, ASCE, 1984

[8] SeaMark Systems, http://www.seamarksystems.com, for concrete/bitumen
mattress

[9] Pipeshield International Ltd., http://www.pipeshield.co.uk, for concrete block and
mattress

[10] Pro-Dive Marine Services, http://www.prodive.ca, for mattress and fabric
formwork

[11] SLP Engineering, http://www.slp-eng.com/Submat/Grout-Bags.asp, for grout bag
and bitumen mattress

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12 PIPELINE FREE SPAN ANALYSIS


Pipeline free spans could exist at irregular seabed terrain or fault areas. The best way is
to avoid free spans but if not avoidable, it is necessary to check if the anticipated free
span length is acceptable for static and dynamic loads. The static loads include dead
weight of the pipe and waves & current induced hydrodynamic load. Figure 12.1 shows
one example of static pipe stress near free span areas. The dynamic loads come from
vortex induced vibration (VIV, see Figure 12.2) and fatigue damage.


Figure 12.1 Static Free Span Stress





Figure 12.2 Dynamic VIV Loads



Wave &
current

Inline-flow vibration Cross-flow vibration

(small amplitude) (large amplitude)

Wave &
current

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