Subsea Pipeline Span Analysis Based on Fatigue Life

Abstract

Abstract:

Traditionally, span analysis determines the maximum allowable free span length based on the condition that no vortex induced vibration (VIV) will happen and the assumption of strength ultimate limit state (ULS). The cost of span mitigation rises rapidly with the increase of water depth. Free span analysis based on fatigue life could remarkably increase the maximum allowable span length and cut the engineering cost. We present the free span analysis method and criteria for subsea pipeline. Based on the engineering project which is the first time to use fatigue limit for pipeline design, the free span analysis is conducted by fatigue limit state (FLS) and finite element method, and the results minimize the number of span mitigation.

Key words:subsea pipeline,free span,vortex induced vibration,fatigue limit state (FLS),span mitigation

CLC Number:

TE973.92

Xiu-feng LI, Xian-hong FENG. Subsea Pipeline Span Analysis Based on Fatigue Life[J]. Ocean Engineering Equipment and Technology, 2015, 2(3): 196-200.

Figures/Tables5

属性	数值
外径/mm	168.3
壁厚/mm	15.7
外防腐层厚度/mm	2.8
外防腐层密度/(kg·m^-3)	930
管道长度/m	9379
设计压力/MPa	27.0
介质密度/(kg·m^-3)	5.3
水深/m	357
剩余张力/kN	150

Table 1

Fig.1

模态阶数	1	2	3	4	5
自振频率/Hz	0.228	0.476	0.762	1.098	1.493
单位管径位移下的应力/MPa	24.572	47.365	95.374	128.90	208.26

Table 2

Fig.2

模态阶数	1	2	3	4	5
自振频率/Hz	0.091	0.182	0.216	0.277	0.369
单位管径位移下的应力/MPa	7.638	15.52	14.04	23.88	23.83

Table 3

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