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  1. ktlow1

    Sliding friction on waterproofing emebrane

    I have a concrete retaining wall which is placed on a 50 mm of smooth blinding concrete layer, separated by a 0.25 mm polyethylene membrane. Can anyone help with value of coefficient of friction to be adopted for calculation of sliding resistance? What about coefficient of friction between...
  2. ktlow1

    Valve types and differences

    Can anyone guide me as to the differences between the various types of valves to be used in the water industry? I am confused as to the differneces between a stop valve, sluice valve, gate valve, butterfly valve and to their relative performances. Cheers
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