16-001014-02A (Ultimate SCMMP)

    1. Excavation

    Excavate to form a trench allowing adequate space to
    accommodate the HumeGard® GPT. Shore or bench the
    excavation if required.


    If this is a retrofit installation, once excavation reaches
    the level of the pipeline, carefully remove a number of
    pipe lengths in order to provide an unobstructed opening
    for further excavation. This practice will ensure pipe ends
    are not damaged during lowering of the HumeGard® GPT
    into the trench.




    2. Bedding

    It is important that the base of the excavation is
    properly prepared with regard to line, level and degree
    of compaction.


    Humes recommends the use of 200 mm minimum depth
    of compacted crushed rock as adequate bedding for the
    HumeGard® GPT in most situations. It is important to
    ensure that the bedding layer is well compacted and
    levelled correctly so that the openings in the HumeGard®
    GPT will accurately coincide with the inlet/outlet pipes
    once fully installed.


    The correct level of the bedding layer can be established
    via the dimension depicted on the project drawing
    (vertical distance from pipe invert to surface of
    bedding layer).




2   HumeGard® GPT