This paper attempts to quantify the amount of flow within the annular space that could exist between a polymeric liner and a deteriorated host pipe. Inadequate fit of the liner within sewer line segments is likely to cause annular flow that will result in a higher flow rate within the wastewater collection system. The results of full-scale field tests performed by the authors on 12 pipelines lined with four different deformed/reformed or fold-and-form (DR/FF) and cured-in-place-pipe (CIPP) liner products indicated that gaps of different sizes existed in all of the tested pipelines. These gaps have resulted in variable annular flow in the tested pipelines. Based on the results of the full-scale tests, a mathematical relationship was established between the annular flow in a lined pipeline and the annular space. The relationship between the annular flow rate and the average annular gap size depends on the difference in head between the entry and exit points along the pipeline. In turn, the average annular gap size depends on many factors including tolerances and imperfections in the host pipe and liner, conditions of the host pipe and the quality of liner installation. A third-order polynomial equation was found to best describe the relationship between the annular flow and average gap size under high differential heads (up to 3.0 m); whereas, a logarithmic relationship fits best under low differential heads for wider range of annular gap sizes (up to 17.8 mm). Based on the results of the full-scale tests, this is believed to be more representative of typical liner installations.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Quantification of annular flow in lined pipelines


    Additional title:

    Quatifizierung des Ringraumdurchflusses in ausgekleideten Rohrleitungen


    Contributors:

    Published in:

    Publication date :

    2008


    Size :

    7 Seiten, 8 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Polymer Lined Pipelines

    Jee, T. / Medlicott, P. / Green, B. | British Library Online Contents | 1994


    Sound Propagation in Lined Annular Ducts with Mean Swirling Flow

    Maldonado, Ana Luisa P. / Astley, R. Jeremy / Coupland, John et al. | AIAA | 2015


    Plastic lined pipelines for North Sea tie-backs

    Howard, B. | Tema Archive | 2003