Subsea pipeline is crucial for oil and gas transportation. It is advantageous to be able to identify the free-spanning segments of a long subsea pipeline. The existing technologies for detecting the support condition of buried subsea pipelines are constantly affected by complex external environment since they are outer pipeline detecting methods. An inner pipeline method for detecting the support conditions of buried gas subsea pipelines based on forced vibration signal analysis is proposed in this study. Two evaluation indicators, frequency response function and natural frequency change ratio, are used to identify the free-spanning segments. A free span–detecting device and a test rig are built to verify the applicability of the method by forced vibration tests. Gray contour plots of frequency response functions and natural frequency change ratio bar charts are generated to analyze the experimental results. The experimental results show that two evaluation indicators are sensitive to the support condition. The appearance of the free span and its length can be identified by the gray contour plots of frequency response functions and natural frequency change ratio bar chart.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    A method for identifying support conditions of buried subsea gas pipelines based on forced vibration signal analysis


    Contributors:


    Publication date :

    2019-02-01


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Geotechnics for subsea pipelines

    White, D.J. / Cathie, D.N. | Tema Archive | 2011


    Calculation of forced vibration in flexible metallic pipelines

    Itbaev, V. K. | British Library Online Contents | 1996


    Lifting systems for subsea pipelines

    BERG ANDERS VEUNGEN / SKRUNES ODD VEGARD / KNUTSEN JØRN et al. | European Patent Office | 2022

    Free access

    LIFTING SYSTEMS FOR SUBSEA PIPELINES

    BERG ANDERS VEUNGEN / SKRUNES ODD VEGARD / KNUTSEN JØRN et al. | European Patent Office | 2021

    Free access

    Seismic analysis of buried pipelines

    Owens, F.C. | Tema Archive | 1999